Develop Reference

how do i make an android application that run at the background?

I have an the following android application that prints the copied text by the user...
MainActivity.java
package com.example.backgroundrunning;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.ClipboardManager;
import android.content.Intent;
import android.view.Menu;
import android.widget.EditText;
import android.widget.TextView;
#SuppressLint("NewApi")
public class MainActivity extends Activity implements ClipboardManager.OnPrimaryClipChangedListener{
ClipboardManager clipBoard;
TextView tv;
EditText edit;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv=(TextView)findViewById(R.id.note);
edit=(EditText)findViewById(R.id.edit);
clipBoard = (ClipboardManager)getSystemService(CLIPBOARD_SERVICE);
clipBoard.addPrimaryClipChangedListener( this );
startService(new Intent(this,ExampleService.class));
}
#Override
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;
}
#Override
public void onPrimaryClipChanged() {
ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
String test=clipboard.getText().toString();
tv.setText(test);
}
}
ExampleService.java
package com.example.backgroundrunning;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
public class ExampleService extends Service {
#Override
public void onCreate() {
// The service is being created
}
public int onStartCommand(Intent intent, int flags, int startId) {
// handleCommand(intent);
// We want this service to continue running until it is explicitly
// stopped, so return sticky.
return START_STICKY;
}
#Override
public void onRebind(Intent intent) {
// A client is binding to the service with bindService(),
// after onUnbind() has already been called
}
#Override
public void onDestroy() {
// The service is no longer used and is being destroyed
}
#Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
i want to make my program that run at the background silently,
means it doesn't close when the user presses back button
I found this code and added that to my program just like the above code,
But it doesn't work...
What is the problem?
And here is my manifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.backgroundrunning"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.backgroundrunning.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

#Override
public void onBackPressed()
{
Intent i= new Intent(Intent.ACTION_MAIN);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.addCategory(Intent.CATEGORY_HOME);
startActivity(i);
or
Intent i= new Intent(Intent.ACTION_ALL_APPS);
startActivity(i);
}

I need alarm to start after specified time interval but alarm is executing at the start and repeats after certain interval

I have attached my code here for reference.
I need alarm to be executed after certain interval but its starting at the beginning and repeating. Can i get a solution for this.
AlarmManagerExample.java
package com.example.alarmmanagerexample;
import android.os.Bundle;
import android.os.SystemClock;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
public class AlarmManagerExample extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_alarm_manager_example);
try {
//Create a new PendingIntent and add it to the AlarmManager
Intent intent = new Intent(this, RingAlarm.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this,
12345, intent, PendingIntent.FLAG_CANCEL_CURRENT);
AlarmManager am =
(AlarmManager)getSystemService(Activity.ALARM_SERVICE);
am.setRepeating(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime(),
2*60*60,pendingIntent);
} catch (Exception e) {}
}
}
activity_alarm_manager_example.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".AlarmManagerExample" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="#string/hello_world" />
</RelativeLayout>
RingAlarm.java
package com.example.alarmmanagerexample;
import android.app.Activity;
import android.content.Context;
import android.media.MediaPlayer;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
public class RingAlarm extends Activity {
MediaPlayer mp=null ;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.alarm);
Button stopAlarm = (Button) findViewById(R.id.stopAlarm);
mp = MediaPlayer.create(getBaseContext(),R.raw.audio);
stopAlarm.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View arg0, MotionEvent arg1) {
// TODO Auto-generated method stub
mp.stop();
finish();
return false;
}
});
playSound(this, getAlarmUri());
}
private void playSound(final Context context, Uri alert) {
Thread background = new Thread(new Runnable() {
public void run() {
try {
mp.start();
} catch (Throwable t) {
Log.i("Animation", "Thread exception "+t);
}
}
});
background.start();
}
#Override
protected void onDestroy() {
super.onDestroy();
mp.stop();
} //Get an alarm sound. Try for an alarm. If none set, try notification,
//Otherwise, ringtone.
private Uri getAlarmUri() {
Uri alert = RingtoneManager
.getDefaultUri(RingtoneManager.TYPE_ALARM);
if (alert == null) {
alert = RingtoneManager
.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
if (alert == null) {
alert = RingtoneManager
.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
}
}
return alert;
}
}
Alarm.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button android:text="Stop Alarm" android:id="#+id/stopAlarm"
android:layout_width="wrap_content" android:layout_height="wrap_content" />
</LinearLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.alarmmanagerexample"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.alarmmanagerexample.AlarmManagerExample"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".RingAlarm"
android:label="#string/app_name" />
</application>
</manifest>

simple navigation from 2nd activity to 3rd activity in android without passing any values

From first activity to second activity navigation is working but second activity to third activity navigation is not working in android can any1 please help me.
This is my MainActivity.java
package com.exampl.test;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.app.Activity;
import android.view.View;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void activity2(View view){
Intent intent = new Intent(this,com.exampl.test.MainActivity2.class);
startActivity(intent);
}
#Override
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;
}
}
This is my MainActivity2.java
package com.exampl.test;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
public class MainActivity2 extends Activity {
#SuppressLint("NewApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity2);
getActionBar().setDisplayHomeAsUpEnabled(true);
}
public void activity3(View view){
Intent intent = new Intent(this,com.exampl.test.MainActivity3.class);
startActivity(intent);
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
}
This is my MainActivity3.java
package com.exampl.test;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity3 extends Activity {
#SuppressLint("NewApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity3);
getActionBar().setDisplayHomeAsUpEnabled(true);
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
}
This is my appmanifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.exampl.test"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.exampl.test.MainActivity2"
android:label="#string/title_activity_main_activity2"
android:parentActivityName="com.exampl.test.MainActivity" >
</activity>
<activity
android:name="com.exampl.test.MainActivity3"
android:label="#string/title_activity_main_activity3"
android:parentActivityName="com.exampl.test.MainActivity2" >
</activity>
</application>
</manifest>
please help me wt to modify in above coding
Thanks in advance

Try This!
MainActivity
package com.example.acct;
import com.example.acct.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button =(Button) findViewById(R.id.button1);
Toast.makeText(this, "Activity1", Toast.LENGTH_SHORT).show();
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
activity2();
}
});
}
public void activity2() {
Intent intent = new Intent(this, com.example.acct.MainActivity2.class);
startActivity(intent);
}
#Override
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;
}
}
MainActivity2
package com.example.acct;
import com.example.acct.R;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity2 extends Activity {
Button button;
#SuppressLint("NewApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getActionBar().setDisplayHomeAsUpEnabled(true);
button = (Button) findViewById(R.id.button1);
Toast.makeText(this, "Activity2", Toast.LENGTH_SHORT).show();
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
activity3();
}
});
}
public void activity3() {
Intent intent = new Intent(this, com.example.acct.MainActivity3.class);
startActivity(intent);
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
}
MainActivity3
package com.example.acct;
import com.example.acct.R;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity3 extends Activity {
Button button;
#SuppressLint("NewApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button1);
Toast.makeText(this, "Activity3", Toast.LENGTH_SHORT).show();
getActionBar().setDisplayHomeAsUpEnabled(true);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
activity3();
}
});
}
public void activity3() {
Intent intent = new Intent(this, com.example.acct.MainActivity3.class);
startActivity(intent);
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.acct"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.acct.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity2"
android:parentActivityName=".MainActivity" >
</activity>
<activity
android:name=".MainActivity3"
android:parentActivityName=".MainActivity2" >
</activity>
</application>
</manifest>

How to get the sumary from preferences

One question:
I have a EditTextPreference to let the user type in a default path for the app.
How can I manage that the new value is to be seen in the preferencefragment I use?
After the user clicked ok in the preference window to complete the new settings I want to write the new path as a summary below the title.
I have tried already experiencing with the onSharedPreferenceChanged but it did not work. I do not know how to get access to the edit field from the popup window where the users text is in.
Hope to find some help
Andreas!
Edit:
Here is the source code for the whole PreferenceFragment I used and modified with the suggestions of Rustam. Unfortunately it does not work.
package com.example.wbsettings;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.EditTextPreference;
import android.preference.Preference;
import android.preference.PreferenceFragment;
public class PreferenceFrag extends PreferenceFragment
implements SharedPreferences.OnSharedPreferenceChangeListener{
public static final String KEYVAL = "startpath";
SharedPreferences sp;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.preferences);
EditTextPreference prefUrl = (EditTextPreference) findPreference(KEYVAL);
prefUrl.getEditText().setHint("default path");
//>> Here the app crashed when I debug it
------------------------------------
prefUrl.setSummary(sp.getString(KEYVAL, ""));
}//onCreate
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,String key) {
Preference pref = findPreference(key);
if (pref instanceof EditTextPreference) {
EditTextPreference etp = (EditTextPreference) pref;
pref.setSummary(etp.getText());
}
}//onSharedPreferenceChanged
}
What I also do not understand in your example: Where is the preferences to register with the OnSharedPreferenceChangeListener? I mean as of now I never reach the onSharedPreferenceChanged procedure because of the crash. But when I make the statement a comment and the app is running and finished I have never been stopped at the breakpoint I set within the onSharedPreferenceChanged procedure.
Another question:
What is the best practice here to answer a comment if the answer becomes too long for another comment? I tried to open an answer to my own question. But a pop up informed me that this is not the way it should be. So what to do?
Regards Andreas!

your menu_setting.xml :
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="#+id/menu_settings"
android:orderInCategory="100"
android:showAsAction="never"
android:title="#string/menu_settings"
android:icon="#android:drawable/ic_menu_preferences"/>
</menu>
your preference.xml :
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<EditTextPreference
android:dialogTitle="Enter path"
android:key="prefPath"
android:summary=""
android:title="Path Setting" />
</PreferenceScreen>
your PreferenceFrag should look like this :
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.EditTextPreference;
import android.preference.Preference;
import android.preference.PreferenceFragment;
public class PreferenceFrag extends PreferenceFragment
implements SharedPreferences.OnSharedPreferenceChangeListener{
public static final String KEYVAL = "prefPath";
SharedPreferences sp;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.preference);
EditTextPreference prefPath = (EditTextPreference) findPreference(KEYVAL);
prefPath.getEditText().setHint("sdcard/path");
// Here the app crashed when I debug it
SharedPreferences sp = getPreferenceScreen().getSharedPreferences();
prefPath.setSummary(sp.getString(KEYVAL, ""));
}//onCreate
#Override
public void onResume() {
super.onResume();
// Set up a listener whenever a key changes
getPreferenceScreen().getSharedPreferences()
.registerOnSharedPreferenceChangeListener(this);
}
#Override
public void onPause() {
super.onPause();
// Unregister the listener whenever a key changes
getPreferenceScreen().getSharedPreferences()
.unregisterOnSharedPreferenceChangeListener(this);
}
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,String key) {
Preference pref = findPreference(key);
if (pref instanceof EditTextPreference) {
EditTextPreference etp = (EditTextPreference) pref;
pref.setSummary(etp.getText());
}
}//onSharedPreferenceChanged
}
your PreferenceActivity :
import android.app.Activity;
import android.os.Bundle;
public class PreferenceActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
getFragmentManager().beginTransaction().replace(android.R.id.content,
new PreferenceFrag()).commit();
}
}
your MainActivity :
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
public class MainActivity extends Activity {
private TextView textview;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textview=(TextView)findViewById(R.id.textview);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_setting, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_settings:
Intent i = new Intent(this, PreferenceActivity.class);
startActivity(i);
break;
}
return true;
}
}
finally AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.preferencetest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.preferencetest.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.example.preferencetest.PreferenceActivity"/>
</application>
</manifest>

Setting button for Live Wallpaper doesn't appear

I created a preference files for my slide show Live Wallpaper.
Most of the source are copied from several samples. I think I copied them correctly, and the eclipse shows no warnings or errors for my source.
My problem is that the "Settings" button doesn't appear when I choose the Live Wallpaper.
I checked the very close question "Can't get settings button to display for live wallpaper", but it didn't solve my problem.
I suspect something is wrong with my Manifest, or preference sources, but I couldn't find the point.
Sorry for my bad English.
My sources are follows:
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest package="sample.slide_wallpaper"
android:versionCode="1"
android:versionName="1.0"
xmlns:android="http://schemas.android.com/apk/res/android">
<uses-sdk android:minSdkVersion="7" android:targetSdkVersion="8" />
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:icon="#drawable/icon"
android:label="#string/app_name">
<!-- =========================================================== -->
<!-- Launcher -->
<activity android:name=".Launcher" android:label="#string/app_name"
android:theme="#style/Theme.HalfTrans">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- ==============================================================-->
<!-- Live Wallpaper -->
<service
android:enabled="true"
android:permission="android.permission.BIND_WALLPAPER"
android:label="#string/app_name"
android:name="SlideWallpaper"
android:icon="#drawable/thumbnail">
<intent-filter>
<action android:name="android.service.wallpaper.WallpaperService"></action>
</intent-filter>
<meta-data
android:name="android.service.wallpaper"
android:resource="#xml/wallpaper">
</meta-data>
</service>
<!-- ================================================================= -->
<!-- Preferences -->
<activity
android:name="sample.slide_wallpaper.Prefs"
android:label="#string/wallpaper_settings"
android:theme="#android:style/Theme.WallpaperSettings"
android:exported="true">
<intent-filter>
<category android:name="android.intent.category.PREFERENCE" />
</intent-filter>
</activity>
</application>
</manifest>
settings.xml
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android"
android:title="#string/wallpaper_settings"
>
<ListPreference
android:key="timer_key"
android:title="#string/list_title"
android:summary="#string/list_summary"
android:entries="#array/timer_pref"
android:entryValues="#array/timer_pref_values"
android:defaultValue="5000"
/>
</PreferenceScreen>
**wallpaper.xml**
<?xml version="1.0" encoding="utf-8" ?>
<wallpaper xmlns:android="http://shemas.android.com/apk/res/android"
android:thumbnail="#drawable/thumbnail"
android:description="#string/description"
android:settingsActivity="sample.slidewallpaper.Prefs"
/>
**Prefs.java**
package sample.slide_wallpaper;
import sample.slide_wallpaper.R;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.util.Log;
public class Prefs extends PreferenceActivity
implements SharedPreferences.OnSharedPreferenceChangeListener {
#Override
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
Log.w("Prefs", "prefs onCreate");
addPreferencesFromResource(R.xml.settings);
}
#Override
protected void onDestroy()
{
getPreferenceManager().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
super.onDestroy();
}
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key)
{
}
}
SlideWallpaper.java
package sample.slide_wallpaper;
import java.util.Random;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Handler;
import android.service.wallpaper.WallpaperService;
import android.util.Log;
import android.view.Display;
import android.view.SurfaceHolder;
import android.view.WindowManager;
import android.content.SharedPreferences;
import android.content.res.Resources;
//WallpaperService
public class SlideWallpaper extends WallpaperService {
// Path for Prefs
public static final String SHARED_PREFS_NAME = "sample.slide_wallpaper.Prefs";
#Override
public void onCreate() {
.....
super.onCreate();
}
#Override
public void onDestroy() {
super.onDestroy();
}
#Override
public WallpaperService.Engine onCreateEngine() {
return new WallpaperEngine(getResources());
}
//*********************************************************
//Wallpaper Engine
//*********************************************************
public class WallpaperEngine extends Engine
implements SharedPreferences.OnSharedPreferenceChangeListener {
private final Handler handler=new Handler();
SharedPreferences prefs;
public Bitmap img;
private Bitmap images[] = new Bitmap[5];
private Bitmap eximg;
private final Random randGen = new Random();
private static final String TAG = "WallpaperEngine";
//timer
private long timer = 5000;//interval(sec)×1000
private long startTime = 0;
private int currentAlpha;
private final Paint imagePaint;
private final Runnable drawThread=new Runnable() {
public void run() {
Log.d(TAG,"runnable");
drawFrame();
}
};
public WallpaperEngine(Resources r) {
prefs=SlideWallpaper.this.getSharedPreferences(SHARED_PREFS_NAME, 0);
prefs.registerOnSharedPreferenceChangeListener(this);
images[0]=BitmapFactory.decodeResource(r,R.drawable.imgA);
images[1]=BitmapFactory.decodeResource(r,R.drawable.imgB);
images[2]=BitmapFactory.decodeResource(r,R.drawable.imgC);
images[3]=BitmapFactory.decodeResource(r,R.drawable.imgD);
images[4]=BitmapFactory.decodeResource(r,R.drawable.imgE);
eximg = BitmapFactory.decodeResource(r,R.drawable.bg1);
img = eximg;
imagePaint = new Paint();
imagePaint.setAlpha(255);
}
//=============================
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key){
Log.w(TAG, "onPreferenceChanged");//this Log doesn't show up
String listString = prefs.getString("timer_key", "5000");
int listInt = Integer.parseInt(listString);
timer = listInt;
}
//=================================
#Override
public void onCreate(SurfaceHolder surfaceHolder) {
super.onCreate(surfaceHolder);
Log.d(TAG, "onCreate");
drawFrame();
}
//=====================================
#Override
public void onDestroy() {
super.onDestroy();
handler.removeCallbacks(fadeAnimate);
handler.removeCallbacks(drawThread);
}
//==================================
#Override
public void onVisibilityChanged(boolean visible) {
Log.d(TAG, "Visibility changed");
if (visible) {
if(nowTime() - startTime + 100 < timer){
if (img.isRecycled()) {
img = eximg;
}
drawBitmap(img);
handler.postDelayed(drawThread, timer - (nowTime() - startTime));
}else {
drawFrame();
}
} else {
handler.removeCallbacks(fadeAnimate);
handler.removeCallbacks(drawThread);
}
}
//===================================================
//draws bitmap
private void drawBitmap(Bitmap b) {
............
}
//=========================
#Override
public void onSurfaceCreated(SurfaceHolder holder) {
super.onSurfaceCreated(holder);
}
//============================
#Override
public void onSurfaceChanged(SurfaceHolder holder,
int format,int width,int height) {
super.onSurfaceChanged(holder,format,width,height);
drawFrame();
}
//==============================
#Override
public void onSurfaceDestroyed(SurfaceHolder holder) {
super.onSurfaceDestroyed(holder);
handler.removeCallbacks(fadeAnimate);
handler.removeCallbacks(drawThread);
}
//=================================
#Override
public void onOffsetsChanged(float xOffset,float yOffset,
float xStep,float yStep,int xPixels,int yPixels) {
drawBitmap(img);
}
//=================================================
//Changes image==================================
protected void drawFrame() {
.....
}
private final Runnable fadeAnimate = new Runnable() {
public void run() {
fadeTransition(img, currentAlpha);
}
};
private void fadeTransition(Bitmap b, int alpha) {
.....
}//END fadeTransition
private long nowTime() {
return System.nanoTime() / 1000000;
}
}//Engine
}//END
I really need your help!!
Also, the thumbnail image doesn't show up on the Live Wallpaper list. But this is a small problem.

Your wallpaper.xml has a minor error. The package name is incorrect. It should be:
<?xml version="1.0" encoding="utf-8" ?>
<wallpaper xmlns:android="http://schemas.android.com/apk/res/android"
android:thumbnail="#drawable/thumbnail"
android:description="#string/description"
android:settingsActivity="sample.slide_wallpaper.Prefs"
/>

I solved the problem by myself.
Thanks for Rajesh, I rewrote the whole code of "wallpaper.xml", and it worked correctly.
Actually, I couldn't find the difference, but my revised version is this:
<?xml version="1.0" encoding="utf-8" ?>
<wallpaper
xmlns:android="http://schemas.android.com/apk/res/android"
android:thumbnail="#drawable/thumbnail"
android:description="#string/description"
android:settingsActivity="sample.slide_wallpaper.Prefs"
/>
By revising the source, the thumbnail error was shown up, too!