Database Users

JSON array problem

I used the application in the tutorial here(how to connect android with mySQL throw PHP) and it worked pretty well.
I wanted to try to make a easy social/blog as twitter, where the user input a post and it saves up in the DB, and this part works. The problem is that i also want to view all the post already posted in the application.
But it crash and i cant understand why:
Code:
package com.example.android;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.Calendar;
public class MainActivity extends Activity {
Button buttonGetData = null;
TextView textViewUser = null;
TextView textViewMessage = null;
TextView textViewDate= null;
EditText editTextMessage = null;
[user=439709]@override[/user]
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonGetData = (Button) findViewById(R.id.buttonGetData);
textViewUser = (TextView) findViewById(R.id.textViewUser);
textViewMessage = (TextView) findViewById(R.id.textViewMessage);
textViewDate = (TextView) findViewById(R.id.textViewDate);
editTextMessage = (EditText) findViewById(R.id.editTextMessage);
buttonGetData.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View v) {
//Get the data
String mydate = java.text.DateFormat.getDateTimeInstance().format(Calendar.getInstance().getTime());
String message;
message = editTextMessage.getText().toString();
DoPOST mDoPOST = new DoPOST(MainActivity.this, message, mydate);
mDoPOST.execute("");
buttonGetData.setEnabled(false);
}
});
}
[user=439709]@override[/user]
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public class DoPOST extends AsyncTask <String,Void,Boolean>{
Context mContext = null;
String strMessage = "";
String strDate = "";
String[] resUser;
String[] resMessage;
String[] resDate;
DoPOST(Context context, String Message, String mydate){
mContext = context;
strMessage = Message;
strDate = mydate;
}
Exception exception = null;
[user=439709]@override[/user]
protected Boolean doInBackground(String... arg0) {
try{
//Setup the parameters
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("User", "Daniel"));
nameValuePairs.add(new BasicNameValuePair("Message", strMessage));
nameValuePairs.add(new BasicNameValuePair("Date", strDate));
//Add more parameters as necessary
//Create the HTTP request
HttpParams httpParameters = new BasicHttpParams();
//Setup timeouts
HttpConnectionParams.setConnectionTimeout(httpParameters, 15000);
HttpConnectionParams.setSoTimeout(httpParameters, 15000);
HttpClient httpclient = new DefaultHttpClient(httpParameters);
HttpPost httppost = new HttpPost("http://deeniel.altervista.org/blog.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
String result = EntityUtils.toString(entity);
// Create a JSON object from the request response
JSONArray jObject = new JSONArray(result);
for (int i = 0; i < jObject.length(); i++) {
JSONObject menuObject = jObject.getJSONObject(i);
//resUser[i] = menuObject.getString("User");
resMessage[i] = menuObject.getString("Message");
//resDate[i] = menuObject.getString("Date");
}
}
catch(Exception e){
Log.e("ClientServerDemo", "Error:", e);
exception = e;
}
return null;
}
[user=439709]@override[/user]
protected void onPostExecute(Boolean valid){
//Update the UI
// textViewUser.setText(resUser[0]);
textViewMessage.setText(resMessage[0]);
// textViewDate.setText(resDate[0]);
buttonGetData.setEnabled(true);
if(exception != null){
Toast.makeText(mContext, exception.getMessage(), Toast.LENGTH_LONG).show();
}
}
}
}
In the for loop i also tried instead of adding the json array into a string[]like this:
resMessage = menuObject.getString("Message");
i also tryied withoth a string array, by concatenating inside the for:
resMessage = resMessage + menuObject.getString("Message");
And it doesnt give me any problem to save all the array inside and show it up in the textView.
SO why like this it crash?
Code:
07-06 09:07:49.815 19475-19589/com.example.android E/ClientServerDemo: Error:
java.lang.NullPointerException
at com.example.android.MainActivity$DoPOST.doInBackground(MainActivity.java:130)
at com.example.android.MainActivity$DoPOST.doInBackground(MainActivity.java:77)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:856)
07-06 09:07:49.815 19475-19475/com.example.android E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NullPointerException
at com.example.android.MainActivity$DoPOST.onPostExecute(MainActivity.java:151)
at com.example.android.MainActivity$DoPOST.onPostExecute(MainActivity.java:77)
at android.os.AsyncTask.finish(AsyncTask.java:631)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5226)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
at dalvik.system.NativeStart.main(Native Method)

don't you need to initialize resMessage before you use it?
Code:
resMessage = new String[jObject.length()]

I use Google's gson library for JSON. I think it is much easier.

[Q] Need help with my next update!

Right before i start, i have looked absolutely everywhere for the answer but there's only so much that people talk about so this is my last hope because I've tried and tried but simply can't do it!
Now i understand that to some this may be a very very easy thing to do and although i have learnt a hell of a lot since i started developing, I'm just not a pro (Just yet)
So basically ever since i started my music player, I've had one big problem and that's trying to list music albums and the songs, now, I have code that does work but it simply doesn't go with my apps data source so I'm trying to the code that i done but the code that I done doesn't show the list of songs, becauser it crashes
Here's the code so far:
Code:
public class AlbumsList extends ListActivity{
public ArrayList<HashMap<String,String>> albumsList = new ArrayList<HashMap<String, String>>();
ListView musiclist;
int songAlbum;
int count;
int songPath;
private Cursor cursor;
@Override
public void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.albums);
ArrayList<HashMap<String, String>> albumListData = new ArrayList<HashMap<String, String>>();
final AlbumsList plm = new AlbumsList();
// get all songs from sdcard
this.albumsList = plm.getPlayList(this, count);
// looping through playlist
for (int i = 0; i < albumsList.size(); i++) {
// creating new HashMap
HashMap<String, String> album = albumsList.get(i);
// adding HashList to ArrayList
albumListData.add(album);
}
// Adding menuItems to ListView
ListAdapter adapter = new SimpleAdapter(this, albumListData,
android.R.layout.simple_list_item_1, new String[] { "songAlbum", "songTitle", "orderBy", "songPath", "where", "whereVal" }, new int[] {
android.R.id.text1});
setListAdapter(adapter);
}
public ArrayList<HashMap<String, String>> getPlayList(Context c, int position) {
final String[] columns = { BaseColumns._ID,
AlbumColumns.ALBUM };
final Cursor mCursor = c.getContentResolver().query(MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI,
columns, null, null, null);
String songAlbum = "";
if (mCursor.moveToFirst()) {
do {
mCursor.getString(mCursor.getColumnIndexOrThrow(BaseColumns._ID));
songAlbum = mCursor.getString(mCursor.getColumnIndexOrThrow(AudioColumns.ALBUM));
HashMap<String, String> album = new HashMap<String, String>();
album.put("songAlbum", songAlbum);
albumsList.add(album);
} while (mCursor.moveToNext());
}
return albumsList;
}
@Override
protected void onListItemClick(ListView lv, View v, int position, long id) {
if(cursor.moveToPosition(position)){
cursor = getContentResolver().query(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
new String[] { MediaColumns.TITLE, MediaColumns.DATA, AudioColumns.ALBUM, BaseColumns._ID }, null, null,
"LOWER(" + MediaColumns.TITLE + ") ASC");
String where = AudioColumns.ALBUM
+ "=?";
String whereVal = cursor.getString(cursor.getColumnIndex(AlbumColumns.ALBUM));
String orderBy = MediaColumns.TITLE;
String songTitle = MediaColumns.TITLE;
String songPath = cursor.getString(cursor.getColumnIndexOrThrow(MediaColumns.DATA));
HashMap<String, String> album = new HashMap<String, String>();
album.put("songTitle", songTitle);
album.put("where", where);
album.put("whereVal", whereVal);
album.put("orderBy", orderBy);
album.put("songPath", songPath);
albumsList.add(album);
}else{
}
}
}
That Code successfully gets all the albums but it won't get the songs from the selected album
Here's the LogCat:
Code:
03-18 18:42:21.579: E/AndroidRuntime(10214): at dalvik.system.NativeStart.main(Native Method)
03-18 18:46:48.223: E/SpannableStringBuilder(12325): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
03-18 18:46:48.223: E/SpannableStringBuilder(12325): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
03-18 18:46:48.894: E/AndroidRuntime(12325): FATAL EXCEPTION: main
03-18 18:46:48.894: E/AndroidRuntime(12325): java.lang.NullPointerException
03-18 18:46:48.894: E/AndroidRuntime(12325): at com.simplistic.simplisticmusicfree.AlbumsList.onListItemClick(AlbumsList.java:93)
03-18 18:46:48.894: E/AndroidRuntime(12325): at android.app.ListActivity$2.onItemClick(ListActivity.java:319)
03-18 18:46:48.894: E/AndroidRuntime(12325): at android.widget.AdapterView.performItemClick(AdapterView.java:301)
03-18 18:46:48.894: E/AndroidRuntime(12325): at android.widget.AbsListView.performItemClick(AbsListView.java:1519)
03-18 18:46:48.894: E/AndroidRuntime(12325): at android.widget.AbsListView$PerformClick.run(AbsListView.java:3291)
03-18 18:46:48.894: E/AndroidRuntime(12325): at android.widget.AbsListView$1.run(AbsListView.java:4340)
03-18 18:46:48.894: E/AndroidRuntime(12325): at android.os.Handler.handleCallback(Handler.java:725)
03-18 18:46:48.894: E/AndroidRuntime(12325): at android.os.Handler.dispatchMessage(Handler.java:92)
03-18 18:46:48.894: E/AndroidRuntime(12325): at android.os.Looper.loop(Looper.java:137)
03-18 18:46:48.894: E/AndroidRuntime(12325): at android.app.ActivityThread.main(ActivityThread.java:5328)
03-18 18:46:48.894: E/AndroidRuntime(12325): at java.lang.reflect.Method.invokeNative(Native Method)
03-18 18:46:48.894: E/AndroidRuntime(12325): at java.lang.reflect.Method.invoke(Method.java:511)
03-18 18:46:48.894: E/AndroidRuntime(12325): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
03-18 18:46:48.894: E/AndroidRuntime(12325): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
03-18 18:46:48.894: E/AndroidRuntime(12325): at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:126)
03-18 18:46:48.894: E/AndroidRuntime(12325): at dalvik.system.NativeStart.main(Native Method)
Also just in case your wondering, this is music player in question: https://play.google.com/store/apps/details?id=com.simplistic.simplisticmusicfree
So yeah please for the love of god, help!!!

Updated the Question!

AmatuerAppDeveloper said:
Updated the Question!
Click to expand...
Click to collapse
Sorry but there seems to be a few simple problems there, and the error tells you what it is. I would suspect that the tutorials you have followed have not done a great job, or that you skipped some quite basic things... maybe learn some Java 101 and android basics. BTW I don't mean to sound condescending, I'm actually an authorised Autodesk instructor and developer and artist/trainer so it's maybe the way I say things, it's often for the total benefit of the individual I'm talking to, and quite blunt sometimes.
Your problem is clear and outlined in that error,
Code:
03-18 18:46:48.894: E/AndroidRuntime(12325): java.lang.NullPointerException
03-18 18:46:48.894: E/AndroidRuntime(12325): at com.simplistic.simplisticmusicfree.AlbumsList.onListItemClick(AlbumsList.java:93)
so on line 93, you are asking an "Object" that is actually "NULL" to execute or reference data or method, I would guess that it is as simple as the
Code:
private Cursor cursor;
You never assign it anything, you just create a null reference there. But then you ask it (Being null at this point) to ".moveToPosition()"
BTW: Still not fully awake and only glimpsed at your post

deanwray said:
Sorry but there seems to be a few simple problems there, and the error tells you what it is. I would suspect that the tutorials you have followed have not done a great job, or that you skipped some quite basic things... maybe learn some Java 101 and android basics. BTW I don't mean to sound condescending, I'm actually an authorised Autodesk instructor and developer and artist/trainer so it's maybe the way I say things, it's often for the total benefit of the individual I'm talking to, and quite blunt sometimes.
Your problem is clear and outlined in that error,
Code:
03-18 18:46:48.894: E/AndroidRuntime(12325): java.lang.NullPointerException
03-18 18:46:48.894: E/AndroidRuntime(12325): at com.simplistic.simplisticmusicfree.AlbumsList.onListItemClick(AlbumsList.java:93)
so on line 93, you are asking an "Object" that is actually "NULL" to execute or reference data or method, I would guess that it is as simple as the
Code:
private Cursor cursor;
You never assign it anything, you just create a null reference there. But then you ask it (Being null at this point) to ".moveToPosition()"
BTW: Still not fully awake and only glimpsed at your post
Click to expand...
Click to collapse
Thanks for the reply, I'll have to re look the code and see what I can do, also I'd like to note that I downloaded your beta app and I have to say it certainly looks promising, so im looking forward to official release

AmatuerAppDeveloper said:
Thanks for the reply, I'll have to re look the code and see what I can do, also I'd like to note that I downloaded your beta app and I have to say it certainly looks promising, so im looking forward to official release
Click to expand...
Click to collapse
Thanks for the download Yeah well my 1st app, and still a number of months away from what I would call "releasable".. Need to get all the user in app theming ability in there

[Q] App crashing at loading setContentView

I am writing a simple about android app that posts a status on your Facebook wall, and I am getting a crash caused by setContentView. I set up the Facebook API correctly I believe, but I am still getting a crash. Below is all of the code.
activity_main.java:
Java:
package com.rakesh.itijgm;
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import com.facebook.android.AsyncFacebookRunner;
import com.facebook.android.DialogError;
import com.facebook.android.Facebook;
import com.facebook.android.FacebookError;
public class MainActivity extends Activity {
private static String APP_ID = "443967745743818";
private Facebook facebook;
private AsyncFacebookRunner mAsyncRunner;
String FILENAME = "AndroidSSO_data";
private SharedPreferences mPrefs;
[user=439709]@override[/user]
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); [COLOR="Red"][B]//THE APP CRASHES HERE[/B][/COLOR]
Button btn_fb_login = (Button) findViewById(R.id.btn_fb_login);
facebook = new Facebook(APP_ID);
mAsyncRunner = new AsyncFacebookRunner(facebook);
btn_fb_login.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View view) {
loginToFacebook();
}
});
}
//fb_login
public void loginToFacebook(){
mPrefs = getPreferences(MODE_PRIVATE);
String access_token = mPrefs.getString("access_token", null);
long expires = mPrefs.getLong("access_expires", 0);
if (access_token != null){
facebook.setAccessToken(access_token);
}
if (expires != 0){
facebook.setAccessExpires(expires);
}
if (!facebook.isSessionValid()){
facebook.authorize(this,
new String[]{"email", "publish_stream"},
new Facebook.DialogListener() {
[user=439709]@override[/user]
public void onComplete(Bundle values) {
SharedPreferences.Editor editor = mPrefs.edit();
editor.putString("access_token", facebook.getAccessToken());
editor.putLong("access_expires",facebook.getAccessExpires());
editor.commit();
}
[user=439709]@override[/user]
public void onFacebookError(FacebookError fberror) {
}
[user=439709]@override[/user]
public void onError(DialogError error) {
}
[user=439709]@override[/user]
public void onCancel() {
}
});
}}
[user=439709]@override[/user]
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
[user=439709]@override[/user]
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
I also have my Stack trace:
PHP:
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.facebook.widget.LoginButton" on path: DexPathList[[zip file "/data/app/com.rakesh.itijgm-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.rakesh.itijgm-1, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
at android.view.LayoutInflater.createView(LayoutInflater.java:559)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:696)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
at de.robv.android.xposed.XposedBridge.invokeOriginalMethodNative(Native Method)
at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:631)
at android.view.LayoutInflater.inflate(Native Method)
at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:343)
at android.app.Activity.setContentView(Activity.java:1936)
at com.rakesh.itijgm.MainActivity.onCreate(MainActivity.java:34)
at android.app.Activity.performCreate(Activity.java:5313)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2181)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2276)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1205)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5146)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:796)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:612)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)
at dalvik.system.NativeStart.main(Native Method)
I made sure that the findViewById is referred to the correct element, and that is good, so I can't decipher the problem here.

PHP:
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.facebook.widget.LoginButton" on path: DexPathList[[zip file "/data/app/com.rakesh.itijgm-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.rakesh.itijgm-1, /vendor/lib, /system/lib]]
You are reading the 1st line of the exception right ? That tells you everything you probably need to ? This comment is not meaning to be sarcastic, just it's pretty hard to miss what it's saying lol
Anyways in short you are missing com.facebook.widget.LoginButton from whatever lib I assume you are using it from ... facebook maybe

deanwray said:
PHP:
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.facebook.widget.LoginButton" on path: DexPathList[[zip file "/data/app/com.rakesh.itijgm-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.rakesh.itijgm-1, /vendor/lib, /system/lib]]
You are reading the 1st line of the exception right ? That tells you everything you probably need to ? This comment is not meaning to be sarcastic, just it's pretty hard to miss what it's saying lol
Anyways in short you are missing com.facebook.widget.LoginButton from whatever lib I assume you are using it from ... facebook maybe
Click to expand...
Click to collapse
*facepalm* Thanks, do you know how I can integrate the facebook library properly, I followed the instructions on developers.facebook,com, but apparently, they don't work.

rakeshdas said:
*facepalm* Thanks, do you know how I can integrate the facebook library properly, I followed the instructions on developers.facebook,com, but apparently, they don't work.
Click to expand...
Click to collapse
well depends on build system and ide you're using, could be that the ide has reference but the build system does not... and I would not touch facebook with...well...any appendage or item!

deanwray said:
well depends on build system and ide you're using, could be that the ide has reference but the build system does not... and I would not touch facebook with...well...any appendage or item!
Click to expand...
Click to collapse
Well I am using Android Studio and well FB is using Eclipse in the tutorial, that is an eye sore, should I try switch over to eclipse to see if that fixes the problem?

rakeshdas said:
Well I am using Android Studio and well FB is using Eclipse in the tutorial, that is an eye sore, should I try switch over to eclipse to see if that fixes the problem?
Click to expand...
Click to collapse
well you need to work out why and what is not finding it... just do it logically as if for any possible missing component, and make sure compile order is correct and that gradle knows what it needs... like I say I have little experience with fb, but libs and modules are quite simple as a rule

deanwray said:
well you need to work out why and what is not finding it... just do it logically as if for any possible missing component, and make sure compile order is correct and that gradle knows what it needs... like I say I have little experience with fb, but libs and modules are quite simple as a rule
Click to expand...
Click to collapse
Do know of anyone who has a tutorial on integrating the FB API using Android Studio?

rakeshdas said:
Do know of anyone who has a tutorial on integrating the FB API using Android Studio?
Click to expand...
Click to collapse
Just download the FB SDK and unzip it. Then do a import module (File > Import module) in Android Studio and point to the unzipped sdk folder and it should work.

Anyone took a look at the BT-2000?

The BT-2000 is out as well, and I have had the pleasure of using it for two weeks. It's an interesting device with a stereoscopic camera on the front. Any thoughts of what we could do with a cool feature like that? And are there people out here that see advantages over the BT-200?
My thoughts:
Pros:
Great battery life
Great see through screen
Can handle a bump
Interesting features like IMU
Cons:
Too big, too bulky
5 megapixel camera lacks autofocus
Wired controller isn't very cool
More info:
Epson SDK and developers info
Article about the BT-2000

Bt-2000 pro
Pros:
- Android tablet version
Cons:
- no Moverio app store
- no mouse
- no installed app (for example : no glass mirror)
- no control over display and camera setting

BT2000pro said:
Pros:
- Android tablet version
Cons:
- no Moverio app store
- no mouse
- no installed app (for example : no glass mirror)
- no control over display and camera setting
Click to expand...
Click to collapse
Not totally true, you can use the camera settings with the SDK provided by Epson. Mouse works with an OTG cable.

Hi, anyone developped program for BT-2000 ..?
I have some issues with the EPSON library.
I don't understand why I'm not abble to call some methods form Camera class like setEpsonCameraMode();
If you have ideas ..?
Thanks
Franck

Franck_Cordu said:
Hi, anyone developped program for BT-2000 ..?
I have some issues with the EPSON library.
I don't understand why I'm not abble to call some methods form Camera class like setEpsonCameraMode();
If you have ideas ..?
Thanks
Franck
Click to expand...
Click to collapse
Dear Franck,
This is because Android Studio doesn't recognize these methods as being correct, so it will mark then as faulty or non-existing. You can run the app on the Moverio BT-2000 and you will see that it will work. Don't forget to set the camera fps and preview size to the correct supported values otherwise the app will crash.
Good luck!

Thanks for your answer.
But, I'm sorry, how can you dev apps witch don't compile in Android Studio and install it on the BT2000..?
Moreover, I have contact EPSON support and they gave me a solution to make this methods recognizable by android studio I can give the solution here if someone is interested.
So there is a compatibility problem with packages names.
To finish, I finally succeed to change camera mode, and as you said you have to well configure parameters if not there is a crash. By any chance have you the good parameters to set 5m pixel mode and depth only mode ..?
Thanks a lot for your help,
Best regards,

Franck_Cordu said:
Thanks for your answer.
But, I'm sorry, how can you dev apps witch don't compile in Android Studio and install it on the BT2000..?
Moreover, I have contact EPSON support and they gave me a solution to make this methods recognizable by android studio I can give the solution here if someone is interested.
So there is a compatibility problem with packages names.
To finish, I finally succeed to change camera mode, and as you said you have to well configure parameters if not there is a crash. By any chance have you the good parameters to set 5m pixel mode and depth only mode ..?
Thanks a lot for your help,
Best regards,
Click to expand...
Click to collapse
You need to get the manual to see which FPS ranges are supported by the set camera modes. These are documented in the manual that is on the Epson website. Below the code you need:
Camera.Parameters params = mCamera.getParameters();
params.getEpsonCameraMode();
//Get the supported camera modes (one of them will be 5MP and one will be depth, check debugger for these values)
List<String> supported = params.getSupportedEpsonCameraModes();
//set the desired camera mode
params.setEpsonCameraMode(supported.get(2));
//set the supported FPS range
params.setPreviewFpsRange(7500, 7500);
//Set desired preview size and picture size
params.setPreviewSize(640, 480);
params.setPictureSize(640, 480);

Thanks, effectively that are perfect parameters for single-vga mode but have you the rights ones to 5M mode and depth mode.
When I follow the dev_guide page 62 I have a crash with 5m mode when I invoke setParameters(), with these parameters :
params.setEpsonCameraMode(Supported.get(5));
params.setPreviewSize(2596, 1948);
params.setPreviewFpsRange(7500, 7500);
params.setPictureSize(2596, 1948);
With the depth mode I use theses parameters :
params.setEpsonCameraMode(Supported.get(6));
params.setPreviewSize(640, 480);
params.setPreviewFpsRange(7500, 7500);
params.setPictureSize(640, 480);
l_pCamera.startDepthStreaming(); // I don't forget to start depth mode
And the preview is lunch but the image stay transparent, nothing happen.
If you have any solution.
Thanks a lot.

Franck_Cordu said:
Thanks, effectively that are perfect parameters for single-vga mode but have you the rights ones to 5M mode and depth mode.
When I follow the dev_guide page 62 I have a crash with 5m mode when I invoke setParameters(), with these parameters :
params.setEpsonCameraMode(Supported.get(5));
params.setPreviewSize(2596, 1948);
params.setPreviewFpsRange(7500, 7500);
params.setPictureSize(2596, 1948);
With the depth mode I use theses parameters :
params.setEpsonCameraMode(Supported.get(6));
params.setPreviewSize(640, 480);
params.setPreviewFpsRange(7500, 7500);
params.setPictureSize(640, 480);
l_pCamera.startDepthStreaming(); // I don't forget to start depth mode
And the preview is lunch but the image stay transparent, nothing happen.
If you have any solution.
Thanks a lot.
Click to expand...
Click to collapse
PreviewSize is too big with 5MP, can maximum be 1920x1080 with 7500fps. Try:
params.setEpsonCameraMode(Supported.get(5));
params.setPreviewSize(1920, 1080);
params.setPreviewFpsRange(7500, 7500);
params.setPictureSize(2596, 1948);
Don't forget to call Camera.setParameters(params);
Can't help with the depth sensing as I never used it.

Nice thanks a lot, I don't know why, but I think I done exactly the same yesterday and it didn't work, but today it work perfectly.
Thanks a lot, now I'm looking for someone who is able to set Depth mode..
Again, thanks for your time !

Franck_Cordu said:
Nice thanks a lot, I don't know why, but I think I done exactly the same yesterday and it didn't work, but today it work perfectly.
Thanks a lot, now I'm looking for someone who is able to set Depth mode..
Again, thanks for your time !
Click to expand...
Click to collapse
Your welcome, don't forget to hit the thanks button!

Load the epson Camera class version in Android Studio
Franck_Cordu said:
Thanks for your answer.
But, I'm sorry, how can you dev apps witch don't compile in Android Studio and install it on the BT2000..?
Moreover, I have contact EPSON support and they gave me a solution to make this methods recognizable by android studio I can give the solution here if someone is interested.
So there is a compatibility problem with packages names.
(...)
Click to expand...
Click to collapse
Hi Franck,
I run into the same problem. The Camera class from the Epson library has the same package name as the android Camera class: android.hardware.Camera . So Android Studio finds the android version instead of the Epson one. Can you show the solution please?
Thanks!

I'd be really interested in knowing how you (Franck_Cordu) have resolved the compilation issues with the BT-2000 API. I'm running into the same problems as you are and am desperate for a working solution!

Hello,
First a quick answer for the compilation problem:
--> have a look at the manual (https://tech.moverio.epson.com/en/bt-2000/tools.html), putting and referring correctly the H725Ctrl.jar is a key.
--> they even propose a kind of partial solution in order to have completion. It has to be redone every time you compile/recompile your program though. (Changing the order in the app.iml file)
On my side, I have a very painful problem: (version R1.3 here)
I have carefully followed their Sample Code (Ch. 6.10) but I am unable to open the camera. The system always fails at the camera.open() command in the function below, the output error is shown below the function.
Do any of you understand what may be the problem ? Or anyone could submit a working source code that I could try ....
Code:
@Override
public void surfaceCreated(SurfaceHolder holder) {
Log.d(TAG, "surfaceCreated");
try {
camera = android.hardware.Camera.open();
camera.setPreviewDisplay(holder);
} catch (RuntimeException e) {
Log.d("SR-DEBUG", "There has been a problem opening the camera");
e.printStackTrace();
}
catch(IOException e){
e.printStackTrace();
}
camera.addCallbackBuffer(mPreviewBuf);
camera.setPreviewCallbackWithBuffer(mPreviewCB);
}
Returned Error:
Code:
09-22 14:28:28.437 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 D/com.example.simonruffieux.test_cameradisplay_bt2000.MainActivity: surfaceCreated
09-22 14:28:28.437 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 V/Camera: connect
09-22 14:28:28.445 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 D/SR-DEBUG: There has been a problem opening the camera
09-22 14:28:28.445 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: java.lang.RuntimeException: Fail to connect to camera service
09-22 14:28:28.445 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at android.hardware.Camera.native_setup(Native Method)
09-22 14:28:28.445 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at android.hardware.Camera.<init>(Camera.java:317)
09-22 14:28:28.445 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at android.hardware.Camera.open(Camera.java:294)
09-22 14:28:28.453 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at com.example.simonruffieux.test_cameradisplay_bt2000.MainActivity$2.surfaceCreated(MainActivity.java:70)
09-22 14:28:28.453 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at android.view.SurfaceView.updateWindow(SurfaceView.java:543)
09-22 14:28:28.453 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at android.view.SurfaceView.access$000(SurfaceView.java:82)
09-22 14:28:28.453 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:170)
09-22 14:28:28.453 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:590)
09-22 14:28:28.453 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1617)
09-22 14:28:28.460 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442)
09-22 14:28:28.460 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at android.os.Handler.dispatchMessage(Handler.java:99)
09-22 14:28:28.460 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at android.os.Looper.loop(Looper.java:137)
09-22 14:28:28.460 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at android.app.ActivityThread.main(ActivityThread.java:4424)
09-22 14:28:28.460 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
09-22 14:28:28.460 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at java.lang.reflect.Method.invoke(Method.java:511)
09-22 14:28:28.460 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-22 14:28:28.468 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-22 14:28:28.468 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/System.err: at dalvik.system.NativeStart.main(Native Method)
09-22 14:28:28.468 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 D/AndroidRuntime: Shutting down VM
09-22 14:28:28.468 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x40a891f8)
09-22 14:28:28.484 11461-11461/com.example.simonruffieux.test_cameradisplay_bt2000 E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NullPointerException
at com.example.simonruffieux.test_cameradisplay_bt2000.MainActivity$2.surfaceCreated(MainActivity.java:79)
at android.view.SurfaceView.updateWindow(SurfaceView.java:543)
at android.view.SurfaceView.access$000(SurfaceView.java:82)
at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:170)
at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:590)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1617)
at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
I am using the following <project>/app/build.gradle:
Code:
apply plugin: 'com.android.application'
android {
compileSdkVersion 24
buildToolsVersion "24.0.2"
defaultConfig {
applicationId "com.example.simonruffieux.test_cameradisplay_bt2000"
minSdkVersion 15
targetSdkVersion 24
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
testCompile 'junit:junit:4.12'
compile files('libs/H725Ctrl.jar')
compile 'com.android.support:appcompat-v7:24.2.1'
compile 'com.android.support:support-v4:24.2.1'
}
The following <project>/build.gradle
Code:
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.1.3'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
gradle.projectsEvaluated {
tasks.withType(JavaCompile) {
options.compilerArgs.add('-Xbootclasspath/p:D:/Devel/Android/test_CameraDisplay_BT2000/app/libs/H725Ctrl.jar')
}
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
And finally, the whole MainActivity.java class:
Code:
package com.example.simonruffieux.test_cameradisplay_bt2000;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.app.Activity;
import android.util.Log;
import android.hardware.Camera;
import android.view.WindowManager;
import android.os.Bundle;
import java.util.List;
import java.io.IOException;
public class MainActivity extends AppCompatActivity {
private String TAG = this.getClass().getName();
private Camera camera = null;
private SurfaceHolder mHolder = null;
private byte[] mPreviewData = new byte[1920 * 1080 * 3 / 2];
private byte[] mPreviewBuf = new byte[1920 * 1080 * 3 / 2];
private Object lockObject = new Object();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//SR Full Screen
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().addFlags(0x80000000);
//SR Tests
//camera = Camera.open();
//Camera.Parameters params = camera.getParameters();
//List<String> supportedMode = params.getSupportedEpsonCameraMode(); not accepted, says it does not know this method ...
//SR set camera callback to SurfaceView
SurfaceView cameraPreview = (SurfaceView) findViewById(R.id.preview);
mHolder = cameraPreview.getHolder();
mHolder.addCallback(previewCallback);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
private Camera.PreviewCallback mPreviewCB = new Camera.PreviewCallback() {
@Override
public void onPreviewFrame(byte data[], Camera camera) {
Log.d(TAG, "Save preview image");
synchronized (lockObject) {
mPreviewData = data;
}
camera.addCallbackBuffer(mPreviewBuf);
}
};
private SurfaceHolder.Callback previewCallback = new SurfaceHolder.Callback() {
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
Log.d(TAG, "surfaceDestroyed");
camera.stopPreview();
camera.release();
camera = null;
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
Log.d(TAG, "surfaceCreated");
try {
camera = android.hardware.Camera.open();
camera.setPreviewDisplay(holder);
} catch (RuntimeException e) {
Log.d("SR-DEBUG", "There has been a problem opening the camera");
e.printStackTrace();
}
catch(IOException e){
e.printStackTrace();
}
camera.addCallbackBuffer(mPreviewBuf);
camera.setPreviewCallbackWithBuffer(mPreviewCB);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
camera.stopPreview();
Camera.Parameters params = camera.getParameters();
/* Set camera mode to single-through-5m mode*/
params.setEpsonCameraMode(Camera.Parameters.EPSON_CAMERA_MODE_SINGLE_THROUGH_5M);
/* Set preview resolution to 1080p */
params.setPreviewSize(1920, 1080);
/* Set frame rate to 7.5fps */
params.setPreviewFpsRange(7500, 7500);
/* Reflect parameter change to camera device */
camera.setParameters(params);
camera.addCallbackBuffer(mPreviewData);
camera.setPreviewCallbackWithBuffer(mPreviewCB);
try {
camera.startPreview();
} catch (RuntimeException e) {
e.printStackTrace();
}
}
};
}

Http POST request not sending

I'm trying to build a simple app that sends data to Microsoft Azure IoT Central but I'm getting W/System.err: android.os.NetworkOnMainThreadException error.
Here is my code:
Java:
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;
public class MainActivity extends WearableActivity implements View.OnClickListener {
Button clickMeButton;
TextView textView;
int count = 0;
private TextView mTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = findViewById(R.id.click_button);
button.setOnClickListener(this);
setAmbientEnabled();
}
@Override
public void onClick(View view) {
count++;
final TextView text = (TextView) findViewById(R.id.results);
text.setText("I am clicked: "+count);
int tempValue = count;
JSONObject json = new JSONObject();
try {
json.put("Count", count);
} catch (JSONException e) {
e.printStackTrace();
}
// @Deprecated HttpClient httpClient = new DefaultHttpClient();
HttpClient httpClient = HttpClientBuilder.create().build();
try {
HttpPost request = new HttpPost("URL Link");
StringEntity params = new StringEntity(json.toString());
request.addHeader("Authorization", "SharedAccessSignature Token");
request.addHeader("content-type", "application/json");
request.setEntity(params);
HttpResponse response = (HttpResponse) httpClient.execute(request);
} catch (Exception ex) {
} finally {
// @Deprecated httpClient.getConnectionManager().shutdown();
Log.e("Hello", "I'm done running");
}
Here is the trace:
Code:
W/System.err: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1513)
at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:117)
at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:105)
at java.net.InetAddress.getAllByName(InetAddress.java:1154)
at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:44)
W/System.err: at org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:259)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:159)
at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:304)
at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:611)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446)
at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:863)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:57)
at com.example.wearazure.MainActivity.onClick(MainActivity.java:97)
at android.view.View.performClick(View.java:6599)
at android.view.View.performClickInternal(View.java:6576)
at android.view.View.access$3100(View.java:778)
at android.view.View$PerformClick.run(View.java:25908)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
W/System.err: at android.app.ActivityThread.main(ActivityThread.java:6680)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Any suggestions are appreciated, thanks!

If you network on the main thread, the UI blocks which is bad.
You need to make a separate thread and do the networking on that. Send a message back to the UI thread when you're ready to update the UI.
Eg.
Code:
final handler = new Handler();
new Thread(() -> {
// Networking...
handler.post(() -> {
// Update UI
});
}}).start();
you can also use an async task or a service (send intent, return intent) depending on your needs. They're more work but might help to split things up better.

a1291762 said:
If you network on the main thread, the UI blocks which is bad.
You need to make a separate thread and do the networking on that. Send a message back to the UI thread when you're ready to update the UI.
Eg.
Code:
final handler = new Handler();
new Thread(() -> {
// Networking...
handler.post(() -> {
// Update UI
});
}}).start();
you can also use an async task or a service (send intent, return intent) depending on your needs. They're more work but might help to split things up better.
Click to expand...
Click to collapse
Thanks so much!!