Database Users

[Q] AlertDialog (-> list with a lot of elements) how to handle orientation-change

Hi,
A few weeks ago I started developing an Android app but I've gut one problem
If the user changed the orientation of his phone the Activity is of course newly created. If there is ProgressDialog opened, I simply open a new one and the user does not realize it, but if I show an AlertDialog containing a few hundred elements and the user scrolls a bit he/she will realize it after I recreate the AlertDialog because the dialog will start again with the first element and the user has to scroll newly to the element he wants.
How I handle the "ListDialog":
At first I have two classes which simplify the ListDialog because I use it a few times...
ListDialog class:
Code:
public class ListDialog {
public static int CHOOSE_MODE_ONLINE = 0x01;
public static int CHOOSE_MODE_BOOKMARK = 0x02;
public static int CHOOSE_MODE_LOCAL = 0x03;
public static int CHOOSE_CHAPTER_ONLINE_DOWNLOAD = 0x04;
public static int CHOOSE_CHAPTER_BOOKMARK_DOWNLOAD = 0x05;
public static int CHOOSE_CHAPTER_ONLINE_READ = 0x06;
public static int CHOOSE_CHAPTER_BOOKMARK_READ = 0x07;
public static int CHOOSE_CHAPTER_LOCAL_READ = 0x08;
public static int CHOOSE_CHAPTER_LOCAL_DELETE = 0x09;
public static int GOTO_PAGE = 0x0A;
public static void show(Context context, String title, CharSequence[] elems, final ListMethodInvoker invoker)
{
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle(title);
builder.setItems(elems, new DialogInterface.OnClickListener() {
%mail%Override
public void onClick(DialogInterface dialog, int which) {
invoker.invoke(which);
}
});
builder.setOnCancelListener(new OnCancelListener() {
%mail%Override
public void onCancel(DialogInterface dialog) {
invoker.cancel();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}
}
ListMethodInvoker class:
Code:
public class ListMethodInvoker {
public void invoke(int id)
{
}
public void cancel()
{
}
}
and now I create the dialog:
Code:
ApplicationController.get().addOpenedDialog(ListDialog.CHOOSE_MODE_ONLINE);
ListDialog.show(OnlineActivity.this,
mangaController.getManga().getMangaName(),
new CharSequence[]{"Add to Bookmarks", "Download a Chapter", "Read a Chapter"},
new ListMethodInvoker()
{
%mail%Override
public void invoke(int id)
{
ApplicationController.get().removeOpenedDialog(ListDialog.CHOOSE_MODE_ONLINE);
switch(id)
{
case 0: addBookmark(mangaController.getManga()); break;
case 1:
ApplicationController.get().addOpenedDialog(ListDialog.CHOOSE_CHAPTER_ONLINE_DOWNLOAD);
handleChapter(ChapterMode.Download);
break;
case 2:
ApplicationController.get().addOpenedDialog(ListDialog.CHOOSE_CHAPTER_ONLINE_READ);
handleChapter(ChapterMode.Read);
break;
}
}
%mail%Override
public void cancel()
{
ApplicationController.get().removeOpenedDialog(ListDialog.CHOOSE_MODE_ONLINE);
}
});
I also add the ID of the dialog to my ApplicationController which allows me to remember if a dialog has been openend and I can recreate it when onCreate(...) is called again.
(The ApplicationController uses the singleton design pattern which always allows me to retrieve the same instance of the ApplicationController.)
Thanks in advance
best regards
mike
btw: If you wonder why I write %mail% instead of the correct symbol, I get the following exception message if I use it: To prevent spam to the forums, new users are not permitted to post outside links in their messages. All new user accounts will be verified by moderators before this restriction is removed.

[Q] My App use API of Google Maps but the map is slow

Hello Boys,
I am a new Android developer and I'm developing an app with the API of Google Maps.
Into an area of the map I place many markers.
The application works correctly, but the map scroolling and the map zoom isn't quick, everything goes slow.
The marker that I have included in the map is in the "png" format image, and his weighs is approximately 600 bytes.
it is possible that many marker object cause low map scrool?
this is the code of my APP:
Code:
plublic class IDC extends MapActivity {
private LocationManager locationManager;
private LocationListener locationListener;
private MapController mc;
private MapView mapView;
private String myPosition;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String errore="";
myPosition="";
try{
mapView = (MapView) findViewById(R.id.mapview);
mc = mapView.getController();
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationListener = new GPSLocationListener();
//getMyLocation();
MyDBHelper myDB = new MyDBHelper(IDS.this);
Cursor cursor= myDB.query(new String[] { "x", "y", "y2", "w", "k", "latitude", "longitude"});
//Log.i("NOMI", "TOT. NOMI"+cursor.getCount());
List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.mm_20_blue);
MyItemizedOverlay itemizedoverlay = new MyItemizedOverlay(drawable,IDS.this);
List<Address> address = new ArrayList<Address>();
Log.i("TOT TUPLE", " = "+cursor.getCount());
while(cursor.moveToNext()){
String s= cursor.getString(0);
errore=s;
String nome[]=s.split("-");
// Log.i("Pos Colonna NOME", ""+cursor.getColumnIndex("nome"));
// Log.i("Pos. in Colonna", ""+cursor.getString(0));
//address.addAll(gc.getFromLocationName(nome[1], 1));
//Address a= address.get(address.size()-1);
String la=cursor.getString(5);
String lo=cursor.getString(6);
double latitude= Double.parseDouble(la);
double longitude= Double.parseDouble(lo);
int lan= (int)(latitude*1E6);
int lon= (int)(longitude*1E6);
GeoPoint point = new GeoPoint(lan, lon);
String tel1=cursor.getString(1);
String tel2=cursor.getString(2);
String mail=cursor.getString(4);
String web=cursor.getString(3);
String info[]= {tel1,tel2,nome[1],web,mail};
MyOverlayItem overlayitem = new MyOverlayItem(point, "Hello", nome[0], info);
//mc.animateTo(point);
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
}
mapView.setBuiltInZoomControls(true);
mc.setZoom(6);
}catch (Exception e) {
e.printStackTrace();
}
}
}
Code:
public class MyItemizedOverlay extends ItemizedOverlay {
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
private Context mContext;
private CustomizeDialog customizeDialog;
public MyItemizedOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
}
public MyItemizedOverlay(Drawable defaultMarker, Context context) {
super(boundCenterBottom(defaultMarker));
mContext = context;
}
protected boolean onTap(int index)
MyOverlayItem item = (MyOverlayItem) mOverlays.get(index);
customizeDialog = new CustomizeDialog(mContext);
customizeDialog.setPersonalText(item.getSnippet());
String []info= item.getInfo();
customizeDialog.setT1(info[0]);
customizeDialog.setT2(info[1]);
customizeDialog.setA(info[2]);
customizeDialog.setW(info[3]);
customizeDialog.setM(info[4]);
customizeDialog.show();
return true;
}
protected OverlayItem createItem(int i) {
return mOverlays.get(i);
}
public int size() {
return mOverlays.size();
}
public void addOverlay(OverlayItem overlay) {
mOverlays.add(overlay);
populate();
}
}
what is the problem??....PLEASE, HELP ME!!

Need help identifying error.(Its my first app)

Hi, I am very new to developing apps and I am following the tutorial from Google's Android Training and I am currently at the "Starting your second Activity" stage. The purpose of the tutorial is to create a second activity so that the "Send" button will display the message that I have written.
There are 2 errors here:
Code:
Unknown member 'action_settings' of 'com.mycompany.myapp.R.id'
Unknown member 'fragment_display_message of 'com.mycompany.myapp.R.id'
and this is the code where the error occurs at DisplayMessageActivity java class:
Code:
import android.app.*;
import android.os.*;
import android.view.*;
import android.widget.*;
import android.content.*;
import com.mycompany.myapp.*;
public class DisplayMessageActivity extends Activity
{@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get the message from the intent
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
// Create the text view
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
// Set the text view as the activity layout
setContentView(textView);
}
@Override
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);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() { }
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_display_message,
container, false);
return rootView;
}
}
}
I can't seem to fix this error. I have been trying to find the solution but to no avail.
I don't kow if it help you guys but here's the R.java:
Code:
/* AUTO-GENERATED FILE. DO NOT MODIFY.
*
* This class was automatically generated by the
* aapt tool from the resource data it found. It
* should not be modified by hand.
*/
package com.mycompany.myapp;
public final class R {
public static final class attr {
}
public static final class drawable {
public static final int ic_launcher=0x7f020000;
}
public static final class id {
public static final int edit_message=0x7f050000;
}
public static final class layout {
public static final int main=0x7f030000;
}
public static final class string {
public static final int action_settings=0x7f040003;
public static final int app_name=0x7f040000;
public static final int button_send=0x7f040002;
public static final int edit_message=0x7f040001;
public static final int title_activity_display_message=0x7f040005;
public static final int title_activity_main=0x7f040004;
}
}
Here's the R java:
Code:
/* AUTO-GENERATED FILE. DO NOT MODIFY.
*
* This class was automatically generated by the
* aapt tool from the resource data it found. It
* should not be modified by hand.
*/
package com.mycompany.myapp;
public final class R {
public static final class attr {
}
public static final class drawable {
public static final int ic_launcher=0x7f020000;
}
public static final class id {
public static final int edit_message=0x7f050000;
}
public static final class layout {
public static final int main=0x7f030000;
}
public static final class string {
public static final int action_settings=0x7f040003;
public static final int app_name=0x7f040000;
public static final int button_send=0x7f040002;
public static final int edit_message=0x7f040001;
public static final int title_activity_display_message=0x7f040005;
public static final int title_activity_main=0x7f040004;
}
}
Here's the strings xml:
Code:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">My App</string>
<string name="edit_message">Enter a message</string>
<string name="button_send">Send</string>
<string name="action_settings">Settings</string>
<string name="title_activity_main">MainActivity</string>
<string name="title_activity_display_message">My Message</string>
</resources>
Here's the Mainactivity java
Code:
import android.app.*;
import android.os.*;
import android.view.*;
import android.widget.*;
import android.content.*;
import com.mycompany.myapp.*;
public class MainActivity extends Activity
{
public final static String EXTRA_MESSAGE = "com.example.myapp.MESSAGE";
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);}
public void sendMessage(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
EditText editText = (EditText) findViewById(R.id.edit_message);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
}

Koopla said:
Hi, I am very new to developing apps and I am following the tutorial from Google's Android Training and I am currently at the "Starting your second Activity" stage. The purpose of the tutorial is to create a second activity so that the "Send" button will display the message that I have written.
There are 2 errors here:
Code:
Unknown member 'action_settings' of 'com.mycompany.myapp.R.id'
Unknown member 'fragment_display_message of 'com.mycompany.myapp.R.id'
and this is the code where the error occurs at DisplayMessageActivity java class:
Code:
import android.app.*;
import android.os.*;
import android.view.*;
import android.widget.*;
import android.content.*;
import com.mycompany.myapp.*;
public class DisplayMessageActivity extends Activity
{@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get the message from the intent
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
// Create the text view
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
// Set the text view as the activity layout
setContentView(textView);
}
@Override
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);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() { }
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_display_message,
container, false);
return rootView;
}
}
}
I can't seem to fix this error. I have been trying to find the solution but to no avail.
I don't kow if it help you guys but here's the R.java:
Code:
/* AUTO-GENERATED FILE. DO NOT MODIFY.
*
* This class was automatically generated by the
* aapt tool from the resource data it found. It
* should not be modified by hand.
*/
package com.mycompany.myapp;
public final class R {
public static final class attr {
}
public static final class drawable {
public static final int ic_launcher=0x7f020000;
}
public static final class id {
public static final int edit_message=0x7f050000;
}
public static final class layout {
public static final int main=0x7f030000;
}
public static final class string {
public static final int action_settings=0x7f040003;
public static final int app_name=0x7f040000;
public static final int button_send=0x7f040002;
public static final int edit_message=0x7f040001;
public static final int title_activity_display_message=0x7f040005;
public static final int title_activity_main=0x7f040004;
}
}
Here's the R java:
Code:
/* AUTO-GENERATED FILE. DO NOT MODIFY.
*
* This class was automatically generated by the
* aapt tool from the resource data it found. It
* should not be modified by hand.
*/
package com.mycompany.myapp;
public final class R {
public static final class attr {
}
public static final class drawable {
public static final int ic_launcher=0x7f020000;
}
public static final class id {
public static final int edit_message=0x7f050000;
}
public static final class layout {
public static final int main=0x7f030000;
}
public static final class string {
public static final int action_settings=0x7f040003;
public static final int app_name=0x7f040000;
public static final int button_send=0x7f040002;
public static final int edit_message=0x7f040001;
public static final int title_activity_display_message=0x7f040005;
public static final int title_activity_main=0x7f040004;
}
}
Here's the strings xml:
Code:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">My App</string>
<string name="edit_message">Enter a message</string>
<string name="button_send">Send</string>
<string name="action_settings">Settings</string>
<string name="title_activity_main">MainActivity</string>
<string name="title_activity_display_message">My Message</string>
</resources>
Here's the Mainactivity java
Code:
import android.app.*;
import android.os.*;
import android.view.*;
import android.widget.*;
import android.content.*;
import com.mycompany.myapp.*;
public class MainActivity extends Activity
{
public final static String EXTRA_MESSAGE = "com.example.myapp.MESSAGE";
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);}
public void sendMessage(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
EditText editText = (EditText) findViewById(R.id.edit_message);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
}
Click to expand...
Click to collapse
You haven't created a layout for your second activity .
Create an xml layout file, called fragment_display_message, with at least a textview so that it can display your message, and add at least a textview to display the message
as far as action_settings string is concerned, it seems to be a problem with menu.xml file
if you don't wanna get into that, just delete these lines
PHP:
if (id == R.id.action_settings) {
return true;
}

[Q] GPS with Fragment

Good day. I start learn Fragment and I want use GPS in my Application. and I use Fragment. in fragment who view coordinate i writed next code
Code:
public class MyFragment2 extends Fragment {
public static final String BUTTON_INDEX = "button_index";
private static final int BUTTON_INDEX_DEFAULT = -1;
static TextView txt;
static TextView txt2;
String[] mCatDescription;
public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle saveInstanceState){
View viewHier = inflater.inflate(R.layout.fragment2, container, false);
txt = (TextView)viewHier.findViewById(R.id.textView1);
txt2 = (TextView)viewHier.findViewById(R.id.textView2);
mCatDescription =getResources().getStringArray(R.array.cats);
Bundle args = getArguments();
int buttonIndex = args != null ? args.getInt(BUTTON_INDEX, BUTTON_INDEX_DEFAULT):BUTTON_INDEX_DEFAULT;
if(buttonIndex != BUTTON_INDEX_DEFAULT){
setDiscription(buttonIndex);
}
return viewHier;
}
public void setDiscription(int buttonIndex){
GPSWork gpsWork = new GPSWork();
switch(buttonIndex){
case 1:
txt2.setText("one");
break;
case 2:
gpsWork.GetCoordinates();
break;
case 3:
txt2.setText("therd");
break;
}
}
}
Ok. when we click on button 2 we call method GetCoordinates(). this class have next code
Code:
public class GPSWork{
LocationManager locationManager;
public GPSWork(){
locationManager = (LocationManager)MainActivity.mContext.getSystemService(Context.LOCATION_SERVICE);
}
public void GetCoordinates(){
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
5000, 5, locationListener);
}
private LocationListener locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
MyFragment2.txt2.setText("OK");
}
@Override
public void onProviderDisabled(String provider) {
MyFragment2.txt2.setText("OK");
}
@Override
public void onProviderEnabled(String provider) {
MyFragment2.txt2.setText("OK");
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
MyFragment2.txt2.setText("OK");
}
};
}
how we see, we should get text OK on TextView on MainActivity. but we don't have text, whats wrong? and if I change code in method GetCoordinates() on
Code:
public void GetCoordinates(){
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
1000, 10, locationListener);
}
all work fine, i see text in TextView (OK )

[Q] Changing to another Activity when pressing on a Gridviewpager

I am trying to start a new certain Activity based on which page I am clicking on in a Gridview.
I tried to understand the Sample GridViewPager which is coming along with the sdk and trying to adapt the given explanation on stackoverflow (question # 26343337). But I really don't know how to bring these two things together and even where to start.
The first java.file Selection
Code:
public class Selection extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.selection_grid);
final GridViewPager pager = (GridViewPager) findViewById(R.id.pager);
pager.setAdapter(new Workers(this, getFragmentManager()));
DotsPageIndicator dotsPageIndicator = (DotsPageIndicator) findViewById(R.id.page_indicator);
dotsPageIndicator.setPager(pager);
}
}
and the second java.file Users (thats the Adapter):
Code:
public class Users extends FragmentGridPagerAdapter {
private static final int TRANSITION_DURATION_MILLIS = 100;
private final Context mContext;
private List<Row> mRows;
private ColorDrawable mDefaultBg;
private ColorDrawable mClearBg;
public Users (Context ctx, FragmentManager fm) {
super(fm);
mContext = ctx;
mRows = new ArrayList<Workers.Row>();
mRows.add(new Row(cardFragment(R.string.title, R.string.user1)));
mRows.add(new Row(cardFragment(R.string.title, R.string.user2)));
mRows.add(new Row(cardFragment(R.string.title, R.string.user3)));
mRows.add(new Row(cardFragment(R.string.title, R.string.user4)));
// In case in one row several cardFragments are needed
// mRows.add(new Row(
// cardFragment(R.string.cards_title, R.string.cards_text),
// cardFragment(R.string.expansion_title, R.string.expansion_text)));
mDefaultBg = new ColorDrawable(R.color.dark_grey);
mClearBg = new ColorDrawable(android.R.color.transparent);
}
LruCache<Integer, Drawable> mRowBackgrounds = new LruCache<Integer, Drawable>(3) {
@Override
protected Drawable create(final Integer row) {
int resid = BG_IMAGES[row % BG_IMAGES.length];
new DrawableLoadingTask(mContext) {
@Override
protected void onPostExecute(Drawable result) {
TransitionDrawable background = new TransitionDrawable(new Drawable[] {
mDefaultBg,
result
});
mRowBackgrounds.put(row, background);
notifyRowBackgroundChanged(row);
background.startTransition(TRANSITION_DURATION_MILLIS);
}
}.execute(resid);
return mDefaultBg;
}
};
private Fragment cardFragment(int titleRes, int textRes) {
Resources res = mContext.getResources();
CardFragment fragment =
CardFragment.create(res.getText(titleRes), res.getText(textRes));
// Add some extra bottom margin to leave room for the page indicator
fragment.setCardMarginBottom(
res.getDimensionPixelSize(R.dimen.card_margin_bottom));
return fragment;
}
static final int[] BG_IMAGES = new int[] {
R.drawable.user1,
R.drawable.user2,
R.drawable.user3,
R.drawable.user4
};
/** A convenient container for a row of fragments. */
private class Row {
final List<Fragment> columns = new ArrayList<Fragment>();
public Row(Fragment... fragments) {
for (Fragment f : fragments) {
add(f);
}
}
public void add(Fragment f) {
columns.add(f);
}
Fragment getColumn(int i) {
return columns.get(i);
}
public int getColumnCount() {
return columns.size();
}
}
@Override
public Fragment getFragment(int row, int col) {
Row adapterRow = mRows.get(row);
return adapterRow.getColumn(col);
}
@Override
public Drawable getBackgroundForRow(final int row) {
return mRowBackgrounds.get(row);
}
@Override
public int getRowCount() {
return mRows.size();
}
@Override
public int getColumnCount(int rowNum) {
return mRows.get(rowNum).getColumnCount();
}
class DrawableLoadingTask extends AsyncTask<Integer, Void, Drawable> {
private static final String TAG = "Loader";
private Context context;
DrawableLoadingTask(Context context) {
this.context = context;
}
@Override
protected Drawable doInBackground(Integer... params) {
Log.d(TAG, "Loading asset 0x" + Integer.toHexString(params[0]));
return context.getResources().getDrawable(params[0]);
}
}
}