如何在android中更新系統電池狀態的通知

Question

在通知中，我嘗試更新電池狀態。我用服務創建通知。但我不知道如何與電池狀態更新Notofication：

我也看了這個文檔： http://developer.android.com/guide/topics/ui/notifiers/notifications.html

MainActivity

@Override 
    public void onCreate(Bundle savedInstanceState) { 

registerReceiver(batteryReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED)); 
.. 
} 


private BroadcastReceiver batteryReceiver = new BroadcastReceiver() { 

     private int scale = -1; 
     private int level = -1; 
     private int voltage = -1; 
     private int temp = -1; 

     @Override 
     public void onReceive(Context context, Intent intent) { 
      level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1); 
      scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1); 
      temp = intent.getIntExtra(BatteryManager.EXTRA_TEMPERATURE, -1); 
      voltage = intent.getIntExtra(BatteryManager.EXTRA_VOLTAGE, -1); 

      String ns = Context.NOTIFICATION_SERVICE; 
      NotificationManager mNotificationManager = (NotificationManager)context.getSystemService(ns); 
      long when = System.currentTimeMillis(); 

      String percent = ((level * 100)/scale) + "%"; 
      Notification notification = new Notification(R.drawable.call, percent, when); 
      /* <set your intents here> */ 
      mNotificationManager.notify(7331, notification); 

      Log.d(TAG, "Battery level is " + level + "/" + scale + ", temp is " + temp + ", voltage is " + voltage); 
     } 
    }; 

和我使用的服務，創建通知像

private void showNotification() { 
     Notification notification = new Notification(R.drawable.call, getString(R.string.notification_text), System.currentTimeMillis()); 
     Intent intent = new Intent(this, MainActivity.class); 

     intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP); 
     PendingIntent pi = PendingIntent.getActivity(this, 0, intent, 0); 
     notification.setLatestEventInfo(this, getString(R.string.notification_label), getString(R.string.notification_text_short), pi); 
     notification.flags |= Notification.FLAG_NO_CLEAR; 
     startForeground(7331, notification); 
    } 

錯誤：

12-07 14:46:29.425: E/AndroidRuntime(25758): FATAL EXCEPTION: main 
12-07 14:46:29.425: E/AndroidRuntime(25758): java.lang.RuntimeException: Error receiving broadcast Intent { act=android.intent.action.BATTERY_CHANGED flg=0x60000010 (has extras) } in com.xxx.xxx.MainActivity$1@41558b80 
12-07 14:46:29.425: E/AndroidRuntime(25758): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:737) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at android.os.Handler.handleCallback(Handler.java:605) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at android.os.Handler.dispatchMessage(Handler.java:92) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at android.os.Looper.loop(Looper.java:137) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at android.app.ActivityThread.main(ActivityThread.java:4511) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at java.lang.reflect.Method.invokeNative(Native Method) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at java.lang.reflect.Method.invoke(Method.java:511) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at dalvik.system.NativeStart.main(Native Method) 
12-07 14:46:29.425: E/AndroidRuntime(25758): Caused by: java.lang.IllegalArgumentException: contentView required: pkg=com.xxx.xxx id=7331 notification=Notification(contentView=null vibrate=null,sound=null,defaults=0x0,flags=0x0) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at android.os.Parcel.readException(Parcel.java:1331) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at android.os.Parcel.readException(Parcel.java:1281) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at 
android.app.INotificationManager$Stub$Proxy.enqueueNotificationWithTag(INotificationManager.java:317) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at android.app.NotificationManager.notify(NotificationManager.java:127) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at android.app.NotificationManager.notify(NotificationManager.java:106) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at com.xxx.xxx.MainActivity$1.onReceive(MainActivity.java:72) 
12-07 14:46:29.425: E/AndroidRuntime(25758): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:728) 
12-07 14:46:29.425: E/AndroidRuntime(25758): ... 9 more 

Answer 1

我想你需要使用權限 BATTERY_STATS。 ，如果你想更新通知，您有PendingActivity.getActivity

這裏使用PendingIntent.FLAG_UPDATE_CURRENT的標誌是從我的應用程序的一些代碼：

final NotificationManager notificationMgr = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE); 

Notification note = new Notification(R.drawable.icon, text, System.currentTimeMillis()); 
note.flags = Notification.FLAG_AUTO_CANCEL | Notification.FLAG_ONLY_ALERT_ONCE; 
note.defaults = Notification.DEFAULT_SOUND | Notification.DEFAULT_VIBRATE; 

Intent intent = null; 
PendingIntent pendingIntent = null; 

intent = new Intent(context, MailActivity.class); 
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP); 
pendingIntent = PendingIntent.getActivity(context.getApplicationContext(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); 

note.setLatestEventInfo(context, "nyxdroid", text, pendingIntent); 
notificationMgr.notify(1980 + type, note);