1

デバイスのバッテリー レベルを監視する簡単なアプリを作成しました。私はこのコードを使用します：

private void setProperImageByBatteryLevel() {

    BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            context.unregisterReceiver(this);
            int rawlevel = intent.getIntExtra("level", -1);
            int scale = intent.getIntExtra("scale", -1);
            int level = -1;
            if (rawlevel >= 0 && scale > 0) {
                level = (rawlevel * 100) / scale;
            }
            if (DEBUG) {
                Log.i(TAG, "Charge: " + Integer.toString(level) + "%");
            }
            if (level > 80) {
                batteryImg.setImageResource(R.drawable.bat100);
            } else if (level > 60) {
                batteryImg.setImageResource(R.drawable.bat80);
            } else if (level > 40) {
                batteryImg.setImageResource(R.drawable.bat60);
            } else if (level > 20) {
                batteryImg.setImageResource(R.drawable.bat40);
            } else if (level > 0) {
                batteryImg.setImageResource(R.drawable.bat20);
            }
        }
    };
    IntentFilter batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
    activity.registerReceiver(batteryLevelReceiver, batteryLevelFilter);
}

正常に動作しますが、次の例外が発生することがあります: (約 10/1 回)

01-21 13:16:56.617: E/AndroidRuntime(7810): FATAL EXCEPTION: main
01-21 13:16:56.617: E/AndroidRuntime(7810): java.lang.RuntimeException: Error receiving broadcast Intent { act=android.intent.action.BATTERY_CHANGED flg=0x60000000 (has extras) } in hu.trendency.activitimap.widgets.Battery$2@4053e3b8
01-21 13:16:56.617: E/AndroidRuntime(7810):     at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:722)
01-21 13:16:56.617: E/AndroidRuntime(7810):     at android.os.Handler.handleCallback(Handler.java:587)
01-21 13:16:56.617: E/AndroidRuntime(7810):     at android.os.Handler.dispatchMessage(Handler.java:92)
01-21 13:16:56.617: E/AndroidRuntime(7810):     at android.os.Looper.loop(Looper.java:123)
01-21 13:16:56.617: E/AndroidRuntime(7810):     at android.app.ActivityThread.main(ActivityThread.java:3687)
01-21 13:16:56.617: E/AndroidRuntime(7810):     at java.lang.reflect.Method.invokeNative(Native Method)
01-21 13:16:56.617: E/AndroidRuntime(7810):     at java.lang.reflect.Method.invoke(Method.java:507)
01-21 13:16:56.617: E/AndroidRuntime(7810):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
01-21 13:16:56.617: E/AndroidRuntime(7810):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
01-21 13:16:56.617: E/AndroidRuntime(7810):     at dalvik.system.NativeStart.main(Native Method)
01-21 13:16:56.617: E/AndroidRuntime(7810): Caused by: java.lang.IllegalArgumentException: Receiver not registered: hu.trendency.activitimap.widgets.Battery$2@4053e3b8
01-21 13:16:56.617: E/AndroidRuntime(7810):     at android.app.LoadedApk.forgetReceiverDispatcher(LoadedApk.java:610)
01-21 13:16:56.617: E/AndroidRuntime(7810):     at android.app.ContextImpl.unregisterReceiver(ContextImpl.java:919)
01-21 13:16:56.617: E/AndroidRuntime(7810):     at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:331)
01-21 13:16:56.617: E/AndroidRuntime(7810):     at hu.trendency.activitimap.widgets.Battery$2.onReceive(Battery.java:92)
01-21 13:16:56.617: E/AndroidRuntime(7810):     at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:709)
01-21 13:16:56.617: E/AndroidRuntime(7810):     ... 9 more

誰かが問題を見ますか？

編集 ：

私はあなたが私に言った方法を変えました：私はこれを得ました：

01-23 14:43:40.205: E/AndroidRuntime(27064): FATAL EXCEPTION: main
01-23 14:43:40.205: E/AndroidRuntime(27064): java.lang.RuntimeException: Error receiving broadcast Intent { act=android.intent.action.BATTERY_CHANGED flg=0x60000000 (has extras) } in hu.trendency.activitimap.widgets.Battery$2@40534080
01-23 14:43:40.205: E/AndroidRuntime(27064):    at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:722)
01-23 14:43:40.205: E/AndroidRuntime(27064):    at android.os.Handler.handleCallback(Handler.java:587)
01-23 14:43:40.205: E/AndroidRuntime(27064):    at android.os.Handler.dispatchMessage(Handler.java:92)
01-23 14:43:40.205: E/AndroidRuntime(27064):    at android.os.Looper.loop(Looper.java:123)
01-23 14:43:40.205: E/AndroidRuntime(27064):    at android.app.ActivityThread.main(ActivityThread.java:3687)
01-23 14:43:40.205: E/AndroidRuntime(27064):    at java.lang.reflect.Method.invokeNative(Native Method)
01-23 14:43:40.205: E/AndroidRuntime(27064):    at java.lang.reflect.Method.invoke(Method.java:507)
01-23 14:43:40.205: E/AndroidRuntime(27064):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
01-23 14:43:40.205: E/AndroidRuntime(27064):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
01-23 14:43:40.205: E/AndroidRuntime(27064):    at dalvik.system.NativeStart.main(Native Method)
01-23 14:43:40.205: E/AndroidRuntime(27064): Caused by: java.lang.IllegalArgumentException: Receiver not registered: hu.trendency.activitimap.widgets.Battery$2@40534080
01-23 14:43:40.205: E/AndroidRuntime(27064):    at android.app.LoadedApk.forgetReceiverDispatcher(LoadedApk.java:610)
01-23 14:43:40.205: E/AndroidRuntime(27064):    at android.app.ContextImpl.unregisterReceiver(ContextImpl.java:919)
01-23 14:43:40.205: E/AndroidRuntime(27064):    at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:331)
01-23 14:43:40.205: E/AndroidRuntime(27064):    at hu.trendency.activitimap.widgets.Battery$2.onReceive(Battery.java:93)
01-23 14:43:40.205: E/AndroidRuntime(27064):    at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:709)
4

1 に答える 1

3

変化する

context.unregisterReceiver(this);

に

activity.unregisterReceiver(this);

取得するコンテキストonReceive()は、最初に受信者を登録するために使用したコンテキストと同じである場合と異なる場合があるためです。

unregisterReceiver()への呼び出しをtry/catch ブロックと catch および ignore で囲むこともできIllegalArgumentExceptionます。

于 2013-01-22T12:15:20.503 に答える