So in my toolkit, id like to design an activity where I could point it towards certain lines in the build.prop to allow a user to easily toggle, for instance this line
qemu.hw.mainkeys=0
So, in the layout xml, lets say it had "Enable Nav Bar" and a "Toggle Button" for on/off
Where would i start in developing such a feature?
You create a ToggleButton and whenever it is clicked, you change the line.
What is your problem?
nikwen said:
You create a ToggleButton and whenever it is clicked, you change the line.
What is your problem?
Click to expand...
Click to collapse
My concerns are wouldnt I need to add ro permissions on the prop before toggling and a reboot action to apply
I think your device needs to be rooted to be able to write to the build.prop file. You do not need root access to read it though
I'm from mobile and i can't post some code but i will give you some hints
To edit build.prop programmatically first you ne ed to be rooted then you can use the shell command "sed" to exchange values. Take a look at AOKP settings source on github and look for density changer class
If you want to import various build properties you can use fileinputstream and read the file line by line then let the app create listview custom items for every line in the file (you need a custom adapter) .
Sorry if this post it's not really useful but i will edit this when at PC
Sent from my HTC One X using Tapatalk 4 Beta
Thankyou for the tip! The answer might of been infront of my face possibly...
Sent from my 9300 using xda app-developers app
xcesco89 said:
I'm from mobile and i can't post some code but i will give you some hints
To edit build.prop programmatically first you ne ed to be rooted then you can use the shell command "sed" to exchange values. Take a look at AOKP settings source on github and look for density changer class
If you want to import various build properties you can use fileinputstream and read the file line by line then let the app create listview custom items for every line in the file (you need a custom adapter) .
Sorry if this post it's not really useful but i will edit this when at PC
Sent from my HTC One X using Tapatalk 4 Beta
Click to expand...
Click to collapse
I Wrote something up but I keep getting force closes "Not a java code monkey yet, still learning" and Ill post here what I have when I get to my pc later. Maybe you can see what Im missing or did wrong. What I did is I have a preference screen similiar to AOKP density changer class. What Im going for is a PreferenceList that you click and your values are Enable or Disabled and another preference to reboot to apply settings. Im wanting to allow the user to enable and disable the Navigation Bar by toggling it through the build.prop. If this works, I want to add more toggles custom values like change your phone model, Screen Density, build number, ect; but figured Id start with something simpler first and see if it works.
Sent from my Alps9300 using Tapatalk
Nx Biotic said:
I Wrote something up but I keep getting force closes "Not a java code monkey yet, still learning" and Ill post here what I have when I get to my pc later. Maybe you can see what Im missing or did wrong. What I did is I have a preference screen similiar to AOKP density changer class. What Im going for is a PreferenceList that you click and your values are Enable or Disabled and another preference to reboot to apply settings. Im wanting to allow the user to enable and disable the Navigation Bar by toggling it through the build.prop. If this works, I want to add more toggles custom values like change your phone model, Screen Density, build number, ect; but figured Id start with something simpler first and see if it works.
Sent from my Alps9300 using Tapatalk
Click to expand...
Click to collapse
this is the method you need:
Code:
private void setLcdDensity(int newDensity) {
Helpers.getMount("rw");
new CMDProcessor().su.runWaitFor("busybox sed -i 's|ro.sf.lcd_density=.*|"
+ "ro.sf.lcd_density" + "=" + newDensity + "|' " + "/system/build.prop");
Helpers.getMount("ro");
}
( method took from here : https://github.com/TeamBAKED/packag...aked/romcontrol/fragments/DensityChanger.java )
newDensity is the int/string you let the user set ( you can use a seekbar or a dialog or what you prefer)
you have also CMDProcessor().su.runWaitFor : just use the classes you can find here : https://github.com/TeamBAKED/packag...11bca71808c9143/src/com/baked/romcontrol/util
just add these classes in your project ( these are to simplify your life when you need to use android terminal [ remember to give credits on your app! ] )
Now, you can use various types of views and methods to show to the user all the available props:
- manually add every view for every line in your build.prop ( this will probably limit the compatibility with other devices and make your app "laggy" due to "gazilions" views )
- use a blank linearLayout and inflate a "row view" for every line in build.prop:
read file line by line and import every line in an ArrayList:
Code:
ArrayList<String> Tokens = new ArrayList<String>();
try {
// Open the file that is the first
// command line parameter
FileInputStream fstream = new FileInputStream("/system/build.prop");
// Get the object of DataInputStream
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
// Read File Line By Line
while ((strLine = br.readLine()) != null) {
strLine = strLine.trim();
if ((strLine.length()!=0)) {
String[] names = strLine.split("\\s+");
Tokens.add(names[0]);
}
}
for (String s : Tokens) {
//System.out.println(s);
//Log.d("NNNNNNNNNNNNNNNNNN", s);
}
// Close the input stream
in.close();
} catch (Exception e) {// Catch exception if any
System.err.println("Error: " + e.getMessage());
}
names = new String[Tokens.size()-1];
names = Tokens.toArray(names);
ArrayList<String> value = new ArrayList<String>();
try {
// Open the file that is the first
// command line parameter
FileInputStream fstream = new FileInputStream("/sys/devices/system/cpu/cpu0/cpufreq/UV_mV_table");
// Get the object of DataInputStream
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
// Read File Line By Line
while ((strLine = br.readLine()) != null) {
strLine = strLine.trim();
if ((strLine.length()!=0)) {
String[] val = strLine.split("\\s+");
value.add(val[1]);
}
}
for (String s : value) {
//System.out.println(s);
//Log.d("NNNNNNNNNNNNNNNNNN", s);
}
// Close the input stream
in.close();
} catch (Exception e) {// Catch exception if any
System.err.println("Error: " + e.getMessage());
}
values = new String[value.size()-1];
values = value.toArray(values);
LineNumberReader lnr = null;
try {
lnr = new LineNumberReader(new FileReader(new File("/sys/devices/system/cpu/cpu0/cpufreq/UV_mV_table")));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
lnr.skip(Long.MAX_VALUE);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
int num = lnr.getLineNumber();
Log.d("LINES", ""+num);
int i = 0;
//now inflate a specific view for every line
// you can also filter every item for example by reading the string and inflating a different layout using an if statement
for (String s : names) {
LayoutInflater inflater = (LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View v = inflater.inflate(R.layout.uvrow, null, true);
TextView text0 = (TextView) v.findViewById(R.id.text0);
ImageButton back0 = (ImageButton) v.findViewById(R.id.back0);
final EditText edit0 = (EditText) v.findViewById(R.id.edit0);
ImageButton fwd0 = (ImageButton) v.findViewById(R.id.fwd0);
text0.setText(s);
parentGroup.addView(v);
edit0.setText(values[i]);
/*
* if you need to set listeners and actions insert them inside this loop!
*/
}
if you need more informations, take a look at my code on github ( was my first "really useful" app ): https://github.com/cesco89/CustomSettings/blob/master/src/com/cesco/customsettings/UVTable.java
it's not perfect, could be tricky, but i can't post all the code here
This Is what I put together...Excuse any errors in java...Im new at this. When I start this fragment, I get a force close. What did I do?
Code:
package com.bionx.res.catalyst;
import android.content.Context;
import android.os.Bundle;
import android.os.PowerManager;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.PreferenceFragment;
import com.bionx.res.R;
import com.bionx.res.helpers.CMDProcessor;
import com.bionx.res.helpers.Helpers;
public abstract class Navbar extends PreferenceFragment implements OnPreferenceChangeListener {
Preference mReboot;
ListPreference mStockValue;
int newStockValue;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.navbarchanger);
mStockValue = (ListPreference) findPreference("stock_value");
mStockValue.setOnPreferenceChangeListener(this);
mReboot = findPreference("reboot");
}
public boolean onPreference(Preference preference) {
if (preference == mReboot) {
PowerManager pm = (PowerManager) getActivity()
.getSystemService(Context.POWER_SERVICE);
pm.reboot("Setting Navbar");
}
return false;
}
[user=439709]@override[/user]
public boolean onPreferenceChange(Preference preference, Object newValue) {
if (preference == mStockValue) {
newStockValue = Integer.parseInt((String) newValue);
setNavbarValue(newStockValue);
mStockValue.setSummary(getResources().getString(R.string.navbar_changer) + newStockValue);
return true;
}
return false;
}
private void setNavbarValue(int newNavbar) {
Helpers.getMount("rw");
new CMDProcessor().su.runWaitFor("busybox sed -i 's|qemu.hw.mainkeys=.*|"
+ "qemu.hw.mainkeys" + "=" + newNavbar + "|' " + "/system/build.prop");
Helpers.getMount("ro");
}
}
Code:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android">
<Preference
android:title="System Properties"
android:summary="User System Tweaks" />
<ListPreference
android:entries="@array/navbar_stock_entries"
android:entryValues="@array/navbar_stock_values"
android:key="stock_value"
android:title="NavBar Enabler"
android:summary="Toggle the system navbar" />
<Preference
android:key="reboot"
android:title="Reboot"
android:summary="Applies tweaks and reboots" />
</PreferenceScreen>
Where I launch the fragment.
Code:
...
<header
android:fragment="com.bionx.res.catalyst.Navbar"
android:icon="@drawable/ic_changelog"
android:title="System Ui Tweaks"
android:summary="Developers soup of the week" />
...
Nx Biotic said:
This Is what I put together...Excuse any errors in java...Im new at this. When I start this fragment, I get a force close. What did I do?
Code:
package com.bionx.res.catalyst;
import android.content.Context;
import android.os.Bundle;
import android.os.PowerManager;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.PreferenceFragment;
import com.bionx.res.R;
import com.bionx.res.helpers.CMDProcessor;
import com.bionx.res.helpers.Helpers;
public abstract class Navbar extends PreferenceFragment implements OnPreferenceChangeListener {
Preference mReboot;
ListPreference mStockValue;
int newStockValue;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.navbarchanger);
mStockValue = (ListPreference) findPreference("stock_value");
mStockValue.setOnPreferenceChangeListener(this);
mReboot = findPreference("reboot");
}
public boolean onPreference(Preference preference) {
if (preference == mReboot) {
PowerManager pm = (PowerManager) getActivity()
.getSystemService(Context.POWER_SERVICE);
pm.reboot("Setting Navbar");
}
return false;
}
[user=439709]@override[/user]
public boolean onPreferenceChange(Preference preference, Object newValue) {
if (preference == mStockValue) {
newStockValue = Integer.parseInt((String) newValue);
setNavbarValue(newStockValue);
mStockValue.setSummary(getResources().getString(R.string.navbar_changer) + newStockValue);
return true;
}
return false;
}
private void setNavbarValue(int newNavbar) {
Helpers.getMount("rw");
new CMDProcessor().su.runWaitFor("busybox sed -i 's|qemu.hw.mainkeys=.*|"
+ "qemu.hw.mainkeys" + "=" + newNavbar + "|' " + "/system/build.prop");
Helpers.getMount("ro");
}
}
Code:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android">
<Preference
android:title="System Properties"
android:summary="User System Tweaks" />
<ListPreference
android:entries="@array/navbar_stock_entries"
android:entryValues="@array/navbar_stock_values"
android:key="stock_value"
android:title="NavBar Enabler"
android:summary="Toggle the system navbar" />
<Preference
android:key="reboot"
android:title="Reboot"
android:summary="Applies tweaks and reboots" />
</PreferenceScreen>
Where I launch the fragment.
Code:
...
<header
android:fragment="com.bionx.res.catalyst.Navbar"
android:icon="@drawable/ic_changelog"
android:title="System Ui Tweaks"
android:summary="Developers soup of the week" />
...
Click to expand...
Click to collapse
please post the Log you get on Eclipse !
the log will tell you exactly where the error is
Hi.
I was developing an app in which I needed to access some of the build.prop values without accessing root.
After some days finally I found a good & working solution.
So, for whom they need it later, I decided to share it here.
All you have to do is this :
1. Make a process which executes "getprop" from the "/system/bin/getprop" directory and initialize the String which we want to get (ro.board.platform in example).
2. Make a BufferedReader which gets the value (String) by retrieving the data from a inputStreamReader().
3.Convert the BufferedReader to String.
Help your selves.
Code:
Process p = null;
String board_platform = "";
try {
p = new ProcessBuilder("/system/bin/getprop", "ro.board.platform").redirectErrorStream(true).start();
BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = "";
while ((line=br.readLine()) != null){
board_platform = line;
}
p.destroy();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Thanks man!.,,..
But are we really in such a need of getprop? If I remember correctly, on all Android devices /system partition is world-readable. So we can just read it build.prop like a normal text file and then parse it.
Dr.Alexander_Breen said:
But are we really in such a need of getprop? If I remember correctly, on all Android devices /system partition is world-readable. So we can just read it build.prop like a normal text file and then parse it.
Click to expand...
Click to collapse
Maybe you're right.
But before the TutŘ I collected some info on build.prop.
I read different files from different devices with different ROMs.
And I gained a result : The file differs from ROM to ROM and from device to device.
I had thought of this knowing that in device Nexus 4 "ro.x.y" is in line "z" forexample :
1. Create BufferedReader to read the build.prop file.
2.
// Let's consider ro.x.y : outcome in build.prop
int x = 0;
String y ="";
If ((y = br.readLine()) != null) {
x++;
String line = y;
if (x = z){
// So we have found ro.x.y
String result = line;
result = result.replaceAll("ro.x.y", "");
result = result.replaceAll(" :", "");
}
}
Using this procedure we have retreived the ro.x.y value in Nexus 4.
But does anybody promise that ro.x.y is in line "z" in all devices?
The answer is NO as I mentioned above.
Maybe someone has changed his build.prop file and ... .
I hope it helps.
Shouldn't the title be [Guide], not [Guilde]?
nikwen said:
Shouldn't the title be [Guide], not [Guilde]?
Click to expand...
Click to collapse
Thanks sir.
Didn't notice at all.
And here is C# Translation for the code:
------------------------------------------------------------------------------------------------
Global Variables
------------------------------------------------------------------------------------------------
Code:
private Process p = null;
private string AdbPath = Path.Combine(Path.GetTempPath(), "RegawMOD", "AndroidLib", "adb");
------------------------------------------------------------------------------------------------
Process Definition
------------------------------------------------------------------------------------------------
Code:
try
{
p = new Process();
ProcessStartInfo sInfo = new ProcessStartInfo("cmd");
sInfo.RedirectStandardOutput = true;
sInfo.RedirectStandardInput = true;
sInfo.CreateNoWindow = true;
sInfo.UseShellExecute = false;
sInfo.WindowStyle = ProcessWindowStyle.Hidden;
p.StartInfo = sInfo;
p.OutputDataReceived += p_OutputDataReceived;
p.EnableRaisingEvents = true;
p.Start();
p.BeginOutputReadLine();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error starting adb process", MessageBoxButton.OK, MessageBoxImage.Error);
}
------------------------------------------------------------------------------------------------
p_OutputDataReceived Definition
------------------------------------------------------------------------------------------------
Code:
void p_OutputDataReceived(object sender, DataReceivedEventArgs e)
{
string line = "";
try
{
if (!(line = e.Data).Trim().Length.Equals(0) && !line.Contains("/system/bin/getprop ro.board.platform"))
{
this.Dispatcher.BeginInvoke(new Action(() => txt.AppendText(line + "\n")));
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error Reading Output", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
------------------------------------------------------------------------------------------------
Passing command to our little adb process
------------------------------------------------------------------------------------------------
Code:
if (p != null)
{
p.StandardInput.WriteLine(AdbPath + " shell /system/bin/getprop ro.board.platform");
}
------------------------------------------------------------------------------------------------
Side Notes:
------------------------------------------------------------------------------------------------
Code above will result in active shell, it's a simulation for executing commands via CMD
What you need to do is the following:
Change "AdbPath" content to match the path of your adb executable.
"txt" is the Textbox that will show the output, put your own object.
Remove this line " !line.Contains("/system/bin/getprop ro.board.platform);" from "p_OutputDataReceived" to have an idea why I included it in the first place, it's not a must to have it but it will make output look nicer.
In the "Passing command to our little adb process" section, you can replace " shell /system ...etc" with your own object to make the app flexible and be able to execute any command the user type [example: .p.StandardInput.WriteLine(String.Join(" ", AdbPath , CommandTextBox.Text));]
This is almost the same code I execute in Droid Manager for the active shell, I just added few more lines to serve my active shell demands
My device is rooted, nevertheless it doesn't matter which language we are using, as long as we are executing the same command, then it should work with non rooted devices too just like OP says
I use AndroidLib that's why my Adb path points to AndroidLib's adb executable.
------------------------------------------------------------------------------------------------
Good luck
------------------------------------------------------------------------------------------------
Edit:
Dr.Alexander_Breen said:
But are we really in such a need of getprop? If I remember correctly, on all Android devices /system partition is world-readable. So we can just read it build.prop like a normal text file and then parse it.
Click to expand...
Click to collapse
@Dr.Alexander_Breen Yes /system is read only and we can read the file, but if you read it like a text file you will have to break text apart to get the value and not key + value. and you will have to go line by line to reach the key you want, so by using "getprop" you will get the value without having to write extra lines of code to make the app show you value only. As for me I prefer it that way, no need to make the app execute more lines of code just to get a part of the string.
torpedo mohammadi said:
Using this procedure we have retreived the ro.x.y value in Nexus 4.
But does anybody promise that ro.x.y is in line "z" in all devices?
The answer is NO as I mentioned above.
Maybe someone has changed his build.prop file and ... .
I hope it helps.
Click to expand...
Click to collapse
Well, we are supposed to write smart parser which is indifferent to line number, it searches by key name...and gets the value. However, that is the reinvention of the wheel - getprop does exactly the same.
Just saying that the same result is available without the getprop. But it will be (or will not if you're really good in regular expressions) harder, yes.
Alternatively, you can use reflection to access Android's internal android.os.SystemProperties class.
Here is the class I use to reflect it in Pimp My Rom :
Code:
package com.androguide.pimpmyrom.helpers;
import android.content.Context;
import java.io.File;
import java.lang.reflect.Method;
import dalvik.system.DexFile;
/*
Class using reflection to grant access to the private hidden android.os.SystemProperties class
*/
public class SystemPropertiesReflection {
/**
* This class cannot be instantiated
*/
private SystemPropertiesReflection() {
}
/**
* Get the value for the given key.
*
* @return an empty string if the key isn't found
* @Throws IllegalArgumentException if the key exceeds 32 characters
*/
public static String get(Context context, String key) throws IllegalArgumentException {
String ret = "";
try {
ClassLoader cl = context.getClassLoader();
[user=1299008]@supp[/user]ressWarnings("rawtypes")
Class SystemProperties = cl.loadClass("android.os.SystemProperties");
//Parameters Types
[user=1299008]@supp[/user]ressWarnings("rawtypes")
Class[] paramTypes = new Class[1];
paramTypes[0] = String.class;
Method get = SystemProperties.getMethod("get", paramTypes);
//Parameters
Object[] params = new Object[1];
params[0] = new String(key);
ret = (String) get.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
ret = "";
//TODO
}
return ret;
}
/**
* Get the value for the given key.
*
* [user=2056652]@return[/user] if the key isn't found, return def if it isn't null, or an empty string otherwise
* [user=948141]@Throw[/user]s IllegalArgumentException if the key exceeds 32 characters
*/
public static String get(Context context, String key, String def) throws IllegalArgumentException {
String ret = def;
try {
ClassLoader cl = context.getClassLoader();
[user=1299008]@supp[/user]ressWarnings("rawtypes")
Class SystemProperties = cl.loadClass("android.os.SystemProperties");
//Parameters Types
[user=1299008]@supp[/user]ressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = String.class;
Method get = SystemProperties.getMethod("get", paramTypes);
//Parameters
Object[] params = new Object[2];
params[0] = new String(key);
params[1] = new String(def);
ret = (String) get.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
ret = def;
//TODO
}
return ret;
}
/**
* Get the value for the given key, and return as an integer.
*
* [user=955119]@param[/user] key the key to lookup
* [user=955119]@param[/user] def a default value to return
* [user=2056652]@return[/user] the key parsed as an integer, or def if the key isn't found or
* cannot be parsed
* [user=948141]@Throw[/user]s IllegalArgumentException if the key exceeds 32 characters
*/
public static Integer getInt(Context context, String key, int def) throws IllegalArgumentException {
Integer ret = def;
try {
ClassLoader cl = context.getClassLoader();
[user=1299008]@supp[/user]ressWarnings("rawtypes")
Class SystemProperties = cl.loadClass("android.os.SystemProperties");
//Parameters Types
[user=1299008]@supp[/user]ressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = int.class;
Method getInt = SystemProperties.getMethod("getInt", paramTypes);
//Parameters
Object[] params = new Object[2];
params[0] = new String(key);
params[1] = new Integer(def);
ret = (Integer) getInt.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
ret = def;
//TODO
}
return ret;
}
/**
* Get the value for the given key, and return as a long.
*
* [user=955119]@param[/user] key the key to lookup
* [user=955119]@param[/user] def a default value to return
* [user=2056652]@return[/user] the key parsed as a long, or def if the key isn't found or
* cannot be parsed
* [user=948141]@Throw[/user]s IllegalArgumentException if the key exceeds 32 characters
*/
public static Long getLong(Context context, String key, long def) throws IllegalArgumentException {
Long ret = def;
try {
ClassLoader cl = context.getClassLoader();
[user=1299008]@supp[/user]ressWarnings("rawtypes")
Class SystemProperties = cl.loadClass("android.os.SystemProperties");
//Parameters Types
[user=1299008]@supp[/user]ressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = long.class;
Method getLong = SystemProperties.getMethod("getLong", paramTypes);
//Parameters
Object[] params = new Object[2];
params[0] = new String(key);
params[1] = new Long(def);
ret = (Long) getLong.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
ret = def;
//TODO
}
return ret;
}
/**
* Get the value for the given key, returned as a boolean.
* Values 'n', 'no', '0', 'false' or 'off' are considered false.
* Values 'y', 'yes', '1', 'true' or 'on' are considered true.
* (case insensitive).
* If the key does not exist, or has any other value, then the default
* result is returned.
*
* [user=955119]@param[/user] key the key to lookup
* [user=955119]@param[/user] def a default value to return
* [user=2056652]@return[/user] the key parsed as a boolean, or def if the key isn't found or is
* not able to be parsed as a boolean.
* [user=948141]@Throw[/user]s IllegalArgumentException if the key exceeds 32 characters
*/
public static Boolean getBoolean(Context context, String key, boolean def) throws IllegalArgumentException {
Boolean ret = def;
try {
ClassLoader cl = context.getClassLoader();
[user=1299008]@supp[/user]ressWarnings("rawtypes")
Class SystemProperties = cl.loadClass("android.os.SystemProperties");
//Parameters Types
[user=1299008]@supp[/user]ressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = boolean.class;
Method getBoolean = SystemProperties.getMethod("getBoolean", paramTypes);
//Parameters
Object[] params = new Object[2];
params[0] = new String(key);
params[1] = new Boolean(def);
ret = (Boolean) getBoolean.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
ret = def;
//TODO
}
return ret;
}
/**
* Set the value for the given key.
*
* [user=948141]@Throw[/user]s IllegalArgumentException if the key exceeds 32 characters
* [user=948141]@Throw[/user]s IllegalArgumentException if the value exceeds 92 characters
*/
public static void set(Context context, String key, String val) throws IllegalArgumentException {
try {
[user=1299008]@supp[/user]ressWarnings("unused")
DexFile df = new DexFile(new File("/system/app/Settings.apk"));
[user=1299008]@supp[/user]ressWarnings("unused")
ClassLoader cl = context.getClassLoader();
[user=1299008]@supp[/user]ressWarnings("rawtypes")
Class SystemProperties = Class.forName("android.os.SystemProperties");
//Parameters Types
[user=1299008]@supp[/user]ressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = String.class;
Method set = SystemProperties.getMethod("set", paramTypes);
//Parameters
Object[] params = new Object[2];
params[0] = new String(key);
params[1] = new String(val);
set.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
//TODO
}
}
}
Then, you can create a static method like the following in order to avoid NPEs if the property we're asking for isn't present and such:
Code:
public static String getSystemProp(Context context, String prop, String default) {
String result = null;
try {
result = SystemPropertiesReflection.get(context, prop);
} catch (IllegalArgumentException iae) {
Log.e(TAG, "Failed to get prop: " + prop);
}
return result == null ? default : result;
}
And simply invoke it to get the returned property, for example:
Code:
String prop = getSystemProp(this, "ro.sf.lcd_density", "213");
EDIT : sorry to the guys that were @ mentionned by the code's annotations
@ whoever's code I decide to use: Thanks, I'll make use of this in my library I'll put you in the credits :good:
I'm using the code in the OP and it's returning the default value, but not the actual value... This is really weird...
EDIT: Ok, so it won't update values until I reboot the device. Is there any workaround?
Tezlastorme said:
EDIT: Ok, so it won't update values until I reboot the device. Is there any workaround?
Click to expand...
Click to collapse
The system properties are not reloaded after you edit the build.prop, you need a reboot, or you've to read from build.prop file.
vektor88 said:
The system properties are not reloaded after you edit the build.prop, you need a reboot, or you've to read from build.prop file.
Click to expand...
Click to collapse
But whenever I read directly from build.prop something screws up, like build.prop becomes empty or deletes itself. In my last test my sdcard became corrupted and build.prop became blank.
Sent from my Galaxy Nexus
Tezlastorme said:
But whenever I read directly from build.prop something screws up, like build.prop becomes empty or deletes itself. In my last test my sdcard became corrupted and build.prop became blank.
Sent from my Galaxy Nexus
Click to expand...
Click to collapse
Use setprop and getprop in addition to the changes you make to the build.prop, this way you can get the current value without the hassle or performance loss of having to parse the whole build.prop for each value you want to read.
For example, if you change ro.whatever=true to ro.whatever=false, also do a setprop ro.whatever false so that you can retrieve the value from getprop ro.whatever
Dr.Alexander_Breen said:
But are we really in such a need of getprop? If I remember correctly, on all Android devices /system partition is world-readable. So we can just read it build.prop like a normal text file and then parse it.
Click to expand...
Click to collapse
If this is true (and i think it is), why <ou don't simply use the Java Properties class to read the prop file?
developer.android.com/reference/java/util/Properties.html
Sorry for answering in this old Thread, but i dont see why you read the properties file by yourself.
amfa84 said:
If this is true (and i think it is), why <ou don't simply use the Java Properties class to read the prop file?
developer.android.com/reference/java/util/Properties.html
Sorry for answering in this old Thread, but i dont see why you read the properties file by yourself.
Click to expand...
Click to collapse
Yeah, it should work, in theory.. But in practice it screw things up a lot. It ends up deleting the whole contents of build.prop or not reading correctly and it's very unpredictable :-/
And yes I was using the Properties class (and still do)
Sent from my sushi grade tuna
---------- Post added at 08:48 AM ---------- Previous post was at 08:47 AM ----------
Androguide.fr said:
Use setprop and getprop in addition to the changes you make to the build.prop, this way you can get the current value without the hassle or performance loss of having to parse the whole build.prop for each value you want to read.
For example, if you change ro.whatever=true to ro.whatever=false, also do a setprop ro.whatever false so that you can retrieve the value from getprop ro.whatever
Click to expand...
Click to collapse
Btw I tried this ^^ and it didn't work
Sent from my sushi grade tuna
Tezlastorme said:
Yeah, it should work, in theory.. But in practice it screw things up a lot. It ends up deleting the whole contents of build.prop or not reading correctly and it's very unpredictable :-/
And yes I was using the Properties class (and still do)
Sent from my sushi grade tuna
---------- Post added at 08:48 AM ---------- Previous post was at 08:47 AM ----------
Btw I tried this ^^ and it didn't work
Sent from my sushi grade tuna
Click to expand...
Click to collapse
Then you're not doing it right, it does work, and it's very easy to test, just open Terminal emulator, and try the following:
Code:
setprop ro.test.prop true
getprop ro.test.prop
# returns
true
As I said, this will not modify the build.prop, but if everytime you modify the build.prop you also use setprop, then you can avoir the big performance overhead of having to parse the whole build.prop just to get the value of a single prop.
The best way to me remains accessing the private android.os.SystemProperties class through reflection. I believe I had already posted the class in this thread earlier, but here it is:
PHP:
package com.androguide.pimpmyromv2.helpers;
import android.content.Context;
import java.io.File;
import java.lang.reflect.Method;
import dalvik.system.DexFile;
/**
* Class using reflection to grant access to the private hidden android.os.SystemProperties class
*/
public class SystemPropertiesReflection {
/**
* This class cannot be instantiated
*/
private SystemPropertiesReflection() {
}
/**
* Get the value for the given key.
*
* @return an empty string if the key isn't found
* @throws IllegalArgumentException if the key exceeds 32 characters
*/
public static String get(Context context, String key) throws IllegalArgumentException {
String ret = "";
try {
ClassLoader cl = context.getClassLoader();
@SuppressWarnings("rawtypes")
Class SystemProperties = cl.loadClass("android.os.SystemProperties");
//Parameters Types
@SuppressWarnings("rawtypes")
Class[] paramTypes = new Class[1];
paramTypes[0] = String.class;
Method get = SystemProperties.getMethod("get", paramTypes);
//Parameters
Object[] params = new Object[1];
params[0] = new String(key);
ret = (String) get.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
ret = "";
//TODO
}
return ret;
}
/**
* Get the value for the given key.
*
* @return if the key isn't found, return def if it isn't null, or an empty string otherwise
* @throws IllegalArgumentException if the key exceeds 32 characters
*/
public static String get(Context context, String key, String def) throws IllegalArgumentException {
String ret = def;
try {
ClassLoader cl = context.getClassLoader();
@SuppressWarnings("rawtypes")
Class SystemProperties = cl.loadClass("android.os.SystemProperties");
//Parameters Types
@SuppressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = String.class;
Method get = SystemProperties.getMethod("get", paramTypes);
//Parameters
Object[] params = new Object[2];
params[0] = new String(key);
params[1] = new String(def);
ret = (String) get.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
ret = def;
//TODO
}
return ret;
}
/**
* Get the value for the given key, and return as an integer.
*
* @param key the key to lookup
* @param def a default value to return
* @return the key parsed as an integer, or def if the key isn't found or
* cannot be parsed
* @throws IllegalArgumentException if the key exceeds 32 characters
*/
public static Integer getInt(Context context, String key, int def) throws IllegalArgumentException {
Integer ret = def;
try {
ClassLoader cl = context.getClassLoader();
@SuppressWarnings("rawtypes")
Class SystemProperties = cl.loadClass("android.os.SystemProperties");
//Parameters Types
@SuppressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = int.class;
Method getInt = SystemProperties.getMethod("getInt", paramTypes);
//Parameters
Object[] params = new Object[2];
params[0] = new String(key);
params[1] = new Integer(def);
ret = (Integer) getInt.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
ret = def;
//TODO
}
return ret;
}
/**
* Get the value for the given key, and return as a long.
*
* @param key the key to lookup
* @param def a default value to return
* @return the key parsed as a long, or def if the key isn't found or
* cannot be parsed
* @throws IllegalArgumentException if the key exceeds 32 characters
*/
public static Long getLong(Context context, String key, long def) throws IllegalArgumentException {
Long ret = def;
try {
ClassLoader cl = context.getClassLoader();
@SuppressWarnings("rawtypes")
Class SystemProperties = cl.loadClass("android.os.SystemProperties");
//Parameters Types
@SuppressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = long.class;
Method getLong = SystemProperties.getMethod("getLong", paramTypes);
//Parameters
Object[] params = new Object[2];
params[0] = new String(key);
params[1] = new Long(def);
ret = (Long) getLong.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
ret = def;
//TODO
}
return ret;
}
/**
* Get the value for the given key, returned as a boolean.
* Values 'n', 'no', '0', 'false' or 'off' are considered false.
* Values 'y', 'yes', '1', 'true' or 'on' are considered true.
* (case insensitive).
* If the key does not exist, or has any other value, then the default
* result is returned.
*
* @param key the key to lookup
* @param def a default value to return
* @return the key parsed as a boolean, or def if the key isn't found or is
* not able to be parsed as a boolean.
* @throws IllegalArgumentException if the key exceeds 32 characters
*/
public static Boolean getBoolean(Context context, String key, boolean def) throws IllegalArgumentException {
Boolean ret = def;
try {
ClassLoader cl = context.getClassLoader();
@SuppressWarnings("rawtypes")
Class SystemProperties = cl.loadClass("android.os.SystemProperties");
//Parameters Types
@SuppressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = boolean.class;
Method getBoolean = SystemProperties.getMethod("getBoolean", paramTypes);
//Parameters
Object[] params = new Object[2];
params[0] = new String(key);
params[1] = new Boolean(def);
ret = (Boolean) getBoolean.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
ret = def;
//TODO
}
return ret;
}
/**
* Set the value for the given key.
*
* @throws IllegalArgumentException if the key exceeds 32 characters
* @throws IllegalArgumentException if the value exceeds 92 characters
*/
public static void set(Context context, String key, String val) throws IllegalArgumentException {
try {
@SuppressWarnings("unused")
DexFile df = new DexFile(new File("/system/app/Settings.apk"));
@SuppressWarnings("unused")
ClassLoader cl = context.getClassLoader();
@SuppressWarnings("rawtypes")
Class SystemProperties = Class.forName("android.os.SystemProperties");
//Parameters Types
@SuppressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = String.class;
Method set = SystemProperties.getMethod("set", paramTypes);
//Parameters
Object[] params = new Object[2];
params[0] = new String(key);
params[1] = new String(val);
set.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
//TODO
}
}
}
one x new in android
torpedo mohammadi said:
Hi.
I was developing an app in which I needed to access some of the build.prop values without accessing root.
After some days finally I found a good & working solution.
So, for whom they need it later, I decided to share it here.
All you have to do is this :
1. Make a process which executes "getprop" from the "/system/bin/getprop" directory and initialize the String which we want to get (ro.board.platform in example).
2. Make a BufferedReader which gets the value (String) by retrieving the data from a inputStreamReader().
3.Convert the BufferedReader to String.
Help your selves.
Code:
Process p = null;
String board_platform = "";
try {
p = new ProcessBuilder("/system/bin/getprop", "ro.board.platform").redirectErrorStream(true).start();
BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = "";
while ((line=br.readLine()) != null){
board_platform = line;
}
p.destroy();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Click to expand...
Click to collapse
Hi, Is anyone nood friendly to explain me or some tutorial where and how to put this comand, to change my build.prop without unlocking bootloader on my HOX tegra 3..grateful for any response
---------- Post added at 01:25 PM ---------- Previous post was at 01:13 PM ----------
torpedo mohammadi said:
Hi.
I was developing an app in which I needed to access some of the build.prop values without accessing root.
After some days finally I found a good & working solution.
So, for whom they need it later, I decided to share it here.
All you have to do is this :
1. Make a process which executes "getprop" from the "/system/bin/getprop" directory and initialize the String which we want to get (ro.board.platform in example).
2. Make a BufferedReader which gets the value (String) by retrieving the data from a inputStreamReader().
3.Convert the BufferedReader to String.
Help your selves.
Code:
Process p = null;
String board_platform = "";
try {
p = new ProcessBuilder("/system/bin/getprop", "ro.board.platform").redirectErrorStream(true).start();
BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = "";
while ((line=br.readLine()) != null){
board_platform = line;
}
p.destroy();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Click to expand...
Click to collapse
Hi, Is anyone nood friendly to explain me or some tutorial where and how to put this comand, to change my build.prop without unlocking bootloader on my HOX tegra 3..grateful for any response
Hey,
Sorry for bumping this old thread.
How a non-developer user could use this to change/add build.prop lines?
I got a complete stock Nexus 5X that I'd like to add some new lines into build.prop without root.
Is it possible?
Thanks in advance!
How to integrate that to show in textView?
Moderators... It says I am breaking the rules by asking a question and to ask in the Q&A... But the title of this is "Coding Discussion, Q&A, and Educational Resources" I am not breaking the rules intentionally, I just don't know where else to put this. This is a Coding Question, not a General Question that I would think would get buried and or lost in the General Q&A forum. Please move if you feel I am incorrect.
Hello All, I was hoping someone could help me.
I am trying to create an app that will hide pictures. I want to be able to Pick my App from the Share (Send To) menu from the Users Gallery and have it copy the file to a Directory I have created on my SDCard and then ultimately delete the file from the current location.
Here is what I have so far, but when I pick my app from the Share menu, it crashes the Gallery app. So... I can't even see any errors in my LogCat to even try and troubleshoot my issue.
Can someone point me to a working example of how to do this (I have searched the internet until I am blue in the face) or... I hate to say it... Fix my Code?
Any Help would be appreciated... Thanks!!
Code:
package com.company.privitegallery;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
public class SendToDo extends Activity {
File sdCardLoc = Environment.getExternalStorageDirectory();
File intImagesDir = new File(sdCardLoc,"/DCIM/privgal/.nomedia");
private static final int CAMERA_REQUEST = 1888;
private String selectedImagePath;
String fileName = "capturedImage.jpg";
private static Uri mCapturedImageURI;
[user=439709]@override[/user]
public void onCreate(Bundle savedInstanceState) {
// Get intent, action and MIME type
Intent intent = getIntent();
String action = intent.getAction();
String type = intent.getType();
if (Intent.ACTION_SEND.equals(action) && type != null) {
if ("text/plain".equals(type)) {
handleSendText(intent); // Handle text being sent
} else if (type.startsWith("image/")) {
handleSendImage(intent); // Handle single image being sent
try {
GetPhotoPath();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} else if (Intent.ACTION_SEND_MULTIPLE.equals(action) && type != null) {
if (type.startsWith("image/")) {
handleSendMultipleImages(intent); // Handle multiple images being sent
}
} else {
// Handle other intents, such as being started from the home screen
}
//...
}
void handleSendText(Intent intent) {
String sharedText = intent.getStringExtra(Intent.EXTRA_TEXT);
if (sharedText != null) {
// Update UI to reflect text being shared
}
}
void handleSendImage(Intent intent) {
Uri imageUri = (Uri) intent.getParcelableExtra(Intent.EXTRA_STREAM);
if (imageUri != null) {
// Update UI to reflect image being shared
}
}
void handleSendMultipleImages(Intent intent) {
ArrayList<Uri> imageUris = intent.getParcelableArrayListExtra(Intent.EXTRA_STREAM);
if (imageUris != null) {
// Update UI to reflect multiple images being shared
}
}
public void GetPhotoPath() throws IOException {
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, fileName);
mCapturedImageURI = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
copy(fileName, intImagesDir);
}
[user=439709]@override[/user]
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == CAMERA_REQUEST) {
selectedImagePath = getPath(mCapturedImageURI);
Log.v("selectedImagePath: ", ""+selectedImagePath);
//Save the path to pass between activities
try {
copy(selectedImagePath, intImagesDir);
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
public String getPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
public void copy(String scr, File dst) throws IOException {
InputStream in = new FileInputStream(scr);
OutputStream out = new FileOutputStream(dst);
// Transfer bytes from in to out
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
}
private void deleteLatest() {
// TODO Auto-generated method stub
File f = new File(Environment.getExternalStorageDirectory() + "/DCIM/Camera" );
//Log.i("Log", "file name in delete folder : "+f.toString());
File [] files = f.listFiles();
//Log.i("Log", "List of files is: " +files.toString());
Arrays.sort( files, new Comparator<Object>()
{
public int compare(Object o1, Object o2) {
if (((File)o1).lastModified() > ((File)o2).lastModified()) {
// Log.i("Log", "Going -1");
return -1;
} else if (((File)o1).lastModified() < ((File)o2).lastModified()) {
// Log.i("Log", "Going +1");
return 1;
} else {
// Log.i("Log", "Going 0");
return 0;
}
}
});
//Log.i("Log", "Count of the FILES AFTER DELETING ::"+files[0].length());
files[0].delete();
}
}
What's the gallery log output?
Btw, you're not breaking the rules. This is the right forum for Java Q&A.
nikwen said:
What's the gallery log output?
Click to expand...
Click to collapse
How would I get the Logs for the Gallery? I am using and HTC ONE and it's the standard Gallery. Nothing shows up in LogCat so I'm stuck
nikwen said:
Btw, you're not breaking the rules. This is the right forum for Java Q&A.
Click to expand...
Click to collapse
Great, Thanks!!
StEVO_M said:
How would I get the Logs for the Gallery? I am using and HTC ONE and it's the standard Gallery. Nothing shows up in LogCat so I'm stuck
Great, Thanks!!
Click to expand...
Click to collapse
Do you view the logs on your computer?
There should be an error message in the logs.
nikwen said:
Do you view the logs on your computer?
There should be an error message in the logs.
Click to expand...
Click to collapse
Which Logs?? As I said before. LogCat does not give any errors.
i want to save a layout (relative layout), when i run the app everything is working fine, but i am unable to find saved file/s in the internal storage of the phone. Any help would be appreciated as i am new and unable to sort out what is going wrong . here is my code
Code:
public void saveMe(View v) {
// get prompts.xml view
LayoutInflater li = LayoutInflater.from(this);
View promptsView = li.inflate(R.layout.prompt, null);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
context);
// set prompt.xml to alertdialog builder
alertDialogBuilder.setView(promptsView);
final EditText userInput = (EditText) promptsView
.findViewById(R.id.editTextDialog);
// set dialog message
alertDialogBuilder.setCancelable(false);
alertDialogBuilder.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
final String fileName = userInput.getText().toString();
final View view1=findViewById(R.id.relativeLayout); // The view that you want to save as an image
Bitmap bitmap = Bitmap.createBitmap(view1.getWidth(), view1.getHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(bitmap);
view1.draw(c);
if(fileName.length() == 0)
Toast.makeText(EidCardFinal.this,"Please Enter File Name",Toast.LENGTH_SHORT).show();
else{
File file = new File(context.getFilesDir(), fileName);
if (file.exists())
Toast.makeText(EidCardFinal.this,"File Already Exists",Toast.LENGTH_SHORT).show();
else{
try{
FileOutputStream out = new FileOutputStream(file);
bitmap.compress(CompressFormat.PNG, 100, out);
Toast.makeText(EidCardFinal.this,"File Saved",Toast.LENGTH_SHORT).show();
out.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
}
});
alertDialogBuilder.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}
Try adding a line:
out.flush();
just before calling close() on the FileOutputStream. I think this will get the save code to work, and it's worth trying.
ExoComet said:
Try adding a line:
out.flush();
just before calling close() on the FileOutputStream. I think this will get the save code to work, and it's worth trying.
Click to expand...
Click to collapse
thanks for the suggestion, but i have opted for the external storage and its working fine