我有一个 BroadcastReceiver 并像这样声明它:
<receiver
android:name="com.services.Receiver"
android:enabled="true"
android:exported="true" >
<intent-filter android:priority="999" >
<action android:name="android.intent.action.WALLPAPER_CHANGED" />
</intent-filter>
</receiver>
而接收者是:
@Override
public void onReceive(final Context context, final Intent intent)
{
change_wallpepar.myPrefs = context.getSharedPreferences("myPrefs", Context.MODE_PRIVATE);
new Handler().postDelayed(new Runnable()
{
@Override
public void run()
{
Log.d("MAYUR", "<< wallpepar changed >>");
if (change_wallpepar.myPrefs.getLong("temp_for_change", 1) == 0)
{
context.stopService(new Intent(context, change_wallpepar.class));
}
else
{
SharedPreferences.Editor e = change_wallpepar.myPrefs.edit();
e.putLong("temp_for_change", 0);
e.commit();
}
}
}, 4000);
}
当我在这里改变墙纸时，它应该被调用一次。它确实按照我的预期工作了一段时间，几分钟后它调用 onreceive() 多次 (10-18) 次，即使墙纸的更改只完成了一次。更奇怪的是，它在三星 Galaxy 平板电脑 4.4.2 版上运行良好，但在摩托罗拉 (Moto E 4.4.4) 上无法运行。
我的服务:
public class change_wallpepar extends Service {
@Override
public void onCreate()
{
// TODO Auto-generated method stub
super.onCreate();
mytimer = new Timer();
wpm = WallpaperManager.getInstance(change_wallpepar.this);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
// TODO Auto-generated method stub
myPrefs = getSharedPreferences("myPrefs", MODE_PRIVATE);
intervall = myPrefs.getLong("someValue", 60000);
path_of_wallpepar.clear();
path_of_wallpepar.add("" + "/storage/emulated/0/Android/data/WallpeparAppHistoryPhotos/514.jpg");
path_of_wallpepar.add("" + "/storage/emulated/0/Android/data/WallpeparAppHistoryPhotos/513.jpg");
DisplayImageOptions defaultOption = new DisplayImageOptions.Builder().cacheInMemory(true).cacheOnDisk(true).bitmapConfig(Bitmap.Config.RGB_565).build();
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(change_wallpepar.this).defaultDisplayImageOptions(defaultOption).build();
ImageLoader.getInstance().init(config);
mytimer.schedule(new TimerTask()
{
@Override
public void run()
{
try
{
wpm.setBitmap(ImageLoader.getInstance().loadImageSync("file://" + path_of_wallpepar.get(temper)));
}
catch (IOException e)
{
e.printStackTrace();
}
temper++;
if (temper == path_of_wallpepar.size())
temper = 0;
SharedPreferences.Editor e = change_wallpepar.myPrefs.edit();
e.putLong("temp_for_change", 1);
e.commit();
Log.e("MAYUR", "wallpepar seted");
}
}, 0, intervall);
return super.onStartCommand(intent, flags, startId);
}
@Override
public IBinder onBind(Intent intent)
{
// TODO Auto-generated method stub
return null;
}
public void onDestroy()
{
Toast.makeText(this, "Service Destroyed", Toast.LENGTH_SHORT).show();
Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(1000);
mytimer.cancel();
super.onDestroy();
}
}
我的 Logcat 输出是:
## Logcat ##
04-16 11:06:30.654: E/MAYUR(3405): wallpepar seted
04-16 11:06:34.636: D/MAYUR(3405): << wallpepar changed >>
04-16 11:06:59.584: E/MAYUR(3405): wallpepar seted
04-16 11:07:03.551: D/MAYUR(3405): << wallpepar changed >>
04-16 11:07:30.078: E/MAYUR(3405): wallpepar seted
04-16 11:07:33.979: D/MAYUR(3405): << wallpepar changed >>
04-16 11:07:59.433: E/MAYUR(3405): wallpepar seted
04-16 11:08:03.340: D/MAYUR(3405): << wallpepar changed >>
04-16 11:08:30.029: E/MAYUR(3405): wallpepar seted
04-16 11:08:33.933: D/MAYUR(3405): << wallpepar changed >>
04-16 11:08:59.481: E/MAYUR(3405): wallpepar seted
04-16 11:09:03.383: D/MAYUR(3405): << wallpepar changed >>
04-16 11:09:30.066: E/MAYUR(3405): wallpepar seted
04-16 11:09:33.966: D/MAYUR(3405): << wallpepar changed >>
04-16 11:09:59.448: E/MAYUR(3405): wallpepar seted
04-16 11:10:03.353: D/MAYUR(3405): << wallpepar changed >>
04-16 11:10:30.049: E/MAYUR(3405): wallpepar seted
04-16 11:10:33.955: D/MAYUR(3405): << wallpepar changed >>
04-16 11:10:59.455: E/MAYUR(3405): wallpepar seted
04-16 11:11:03.350: D/MAYUR(3405): << wallpepar changed >>
04-16 11:11:30.182: E/MAYUR(3405): wallpepar seted
04-16 11:11:34.177: D/MAYUR(3405): << wallpepar changed >>
04-16 11:11:59.406: E/MAYUR(3405): wallpepar seted
04-16 11:12:03.315: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:30.025: E/MAYUR(3405): wallpepar seted
04-16 11:12:33.929: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:34.103: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:34.298: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:34.497: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:34.676: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:34.854: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:35.022: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:35.190: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:35.355: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:35.522: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:35.683: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:35.852: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:36.023: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:36.187: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:36.350: D/MAYUR(3405): << wallpepar changed >>
04-16 11:12:36.513: D/MAYUR(3405): << wallpepar changed >>
最佳答案
重复的 WALLPAPER_CHANGED 调用是由较小的 Android 设备在图像上运行裁剪比例循环以适应屏幕造成的。这在 AOSP code 中观察到。 .当屏幕比例适合或大于图像时，您不太可能看到此行为，因此平板电脑不会出现此行为。
您可以通过仔细检查是否存在不良行为的迹象来解决此问题:
long lastExec = System.currentTimeMillis();
@Override
public void onReceive(final Context context, final Intent intent)
{
change_wallpepar.myPrefs = context.getSharedPreferences("myPrefs", Context.MODE_PRIVATE);
new Handler().postDelayed(new Runnable()
{
@Override
public void run()
{
if(System.currentTimeMillis()-lastExec>1000)
{
Log.d("MAYUR", "<< wallpepar changed >>");
if (change_wallpepar.myPrefs.getLong("temp_for_change", 1) == 0)
{
context.stopService(new Intent(context, change_wallpepar.class));
}
else
{
SharedPreferences.Editor e = change_wallpepar.myPrefs.edit();
e.putLong("temp_for_change", 0);
e.commit();
}
}
lastExec = System.currentTimeMillis();
}
}, 4000);
}
关于android - 用于 WALLPAPER_CHANGED 的 BroadcastReceiver 多次调用 onReceive() : Android，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29666294/