如何检测何时电池电量低：Android？
问题内容：
当设备的电池电量不足时，我想关闭我的应用程序。我在清单中添加了以下代码。
<receiver android:name=".BatteryLevelReceiver"
<intent-filter>
<action android:name="android.intent.action.ACTION_BATTERY_LOW" />
<action android:name="android.intent.action.ACTION_BATTERY_OKAY" />
</intent-filter>
</receiver>
并在接收器中遵循以下代码
public class BatteryLevelReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
Toast.makeText(context, "BAttery's dying!!", Toast.LENGTH_LONG).show();
Log.e("", "BATTERY LOW!!");
}
}
我正在模拟器上运行该应用程序，并使用telnet更改了电池电量。它会更改电池电量，但不会显示任何吐司或记录。
我想念什么？任何帮助表示赞赏！谢谢。
问题答案：
在代码中而不是在AndroidManifest文件中注册您的接收器。
registerReceiver(batteryChangeReceiver, new IntentFilter(
Intent.ACTION_BATTERY_CHANGED)); // register in activity or service
public class BatteryChangeReceiver extends BroadcastReceiver {
int scale = -1;
int level = -1;
int voltage = -1;
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);
}
}
unregisterReceiver(batteryChangeReceiver);//unregister in the activity or service
或使用null接收器收听电池电量。
Intent BATTERYintent = this.registerReceiver(null, new IntentFilter(
Intent.ACTION_BATTERY_CHANGED));
int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
Log.v(null, "LEVEL" + level);
