即使應用程序關閉，如何啓動Android通知？

Question

請幫助我..， 即使應用程序關閉，如何啓動Android通知？

這是我在MainActivity.class代碼：

public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 




     startService(new Intent(MainActivity.this, myService.class)); 
     AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE); 
     Intent i = new Intent(this, myService.class); 
     PendingIntent pi = PendingIntent.getService(this, 0, i, 0); 
     am.cancel(pi); 
     am.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + 60000, 60000, pi); 

.............. 
........... 

&這是我在myService.class代碼：

import java.util.Date; 
import android.app.Notification; 
import android.app.NotificationManager; 
import android.app.PendingIntent; 
import android.app.Service; 
import android.content.Intent; 
import android.net.ConnectivityManager; 
import android.os.AsyncTask; 
import android.os.IBinder; 
import android.os.PowerManager; 
import android.os.PowerManager.WakeLock; 

public class myService extends Service { 
    @Override 
    public int onStartCommand(Intent intent, int flags, int startId) { 
     handleIntent(intent); 
     return START_NOT_STICKY; 
    } 
    private NotificationManager nm; 
    private WakeLock mWakeLock; 

    @Override 
    public IBinder onBind(Intent intent) { 
     // TODO Auto-generated method stub 
     return null; 
    } 

    @Override 
    public void onDestroy() { 
     super.onDestroy(); 
     mWakeLock.release(); 
    } 

    @SuppressWarnings("deprecation") 
    private void showNotification() { 

     nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); 
     Notification notification = new Notification(R.drawable.ic_launcher, 
       "Notification Ticker", System.currentTimeMillis()); 
     notification.flags = Notification.FLAG_AUTO_CANCEL; 
     Date date = new Date(System.currentTimeMillis()); 
     Intent i = new Intent(this, MainActivity.class); 
     i.putExtra("notification", 
       "This is the Notification " + date); 
     i.putExtra("notifiedby", "xyz"); 
     PendingIntent contentIntent = PendingIntent.getActivity(this, 0, i, 
       PendingIntent.FLAG_UPDATE_CURRENT); 
     notification.setLatestEventInfo(this, "xyz", 
       "This is the Notification", contentIntent); 
     nm.notify(R.string.service_started, notification); 
    } 

    private class PollTask extends AsyncTask<Void, Void, Void> { 

     @Override 
     protected Void doInBackground(Void... params) { 
      showNotification(); 
      return null; 
     } 

     @Override 
     protected void onPostExecute(Void result) { 
      stopSelf(); 
     } 
    } 

    @SuppressWarnings("deprecation") 
    private void handleIntent(Intent intent) { 
     // obtain the wake lock 
     PowerManager pm = (PowerManager) getSystemService(POWER_SERVICE); 
     mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, 
       "NotificationsService"); 
     mWakeLock.acquire(); 
     // check the global background data setting 
     ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE); 
     if (!cm.getBackgroundDataSetting()) { 
      stopSelf(); 
      return; 
     } 
     new PollTask().execute(); 
    } 
} 

我不會在所有的工作，我不不知道爲什麼 所以請幫助我，我是Android編程的新手:)

Answer 1

• * /試試這個，你必須使用廣播接收器。 而且還清單文件添加此，

  <uses-permission android:name="android.permission.WAKE_LOCK" /> 
  

//

 private final BroadcastReceiver mHandleMessageReceiver = new BroadcastReceiver() { 
    @Override 
    public void onReceive(Context context, Intent intent) { 
     String newMessage = intent.getExtras().getString(EXTRA_MESSAGE); 
     // Waking up mobile if it is sleeping 
     WakeLocker.acquire(getApplicationContext()); 

     /** 
     * Take appropriate action on this message 
     * depending upon your app requirement 
     * For now i am just displaying it on the screen 
     * */ 

     // Showing received message 
     lblMessage.append(newMessage + "\n");   
     Toast.makeText(getApplicationContext(), "New Message: " +  newMessage, Toast.LENGTH_LONG).show(); 

     // Releasing wake lock 
     WakeLocker.release(); 
    }}; 

//

public abstract class WakeLocker { 
    private static PowerManager.WakeLock wakeLock; 

    public static void acquire(Context context) { 
    if (wakeLock != null) wakeLock.release(); 

    PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE); 
    wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK | 
      PowerManager.ACQUIRE_CAUSES_WAKEUP | 
      PowerManager.ON_AFTER_RELEASE, "WakeLock"); 
    wakeLock.acquire(); 
    } 

    public static void release() { 
    if (wakeLock != null) wakeLock.release(); wakeLock = null; 
    } 
    } 

// 你必須寫廣播接收器的代碼主要活動。因爲你在發生通知時調用mainactivity。