如何监听安卓电量变化

要监听安卓电量变化，可以使用以下步骤：

创建一个BroadcastReceiver类，用于接收系统的电量变化广播。

public class BatteryBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
        float batteryLevel = level * 100 / (float) scale;
        // 处理电量变化事件
    }
}

在AndroidManifest.xml文件中声明接收电量变化广播的权限和BroadcastReceiver。

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

<receiver android:name=".BatteryBroadcastReceiver">
    <intent-filter>
        <action android:name="android.intent.action.BATTERY_CHANGED" />
    </intent-filter>
</receiver>

在需要监听电量变化的Activity或Service中注册BroadcastReceiver。

BatteryBroadcastReceiver batteryBroadcastReceiver = new BatteryBroadcastReceiver();
IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(batteryBroadcastReceiver, filter);

在不需要监听电量变化的时候，记得取消注册BroadcastReceiver。

unregisterReceiver(batteryBroadcastReceiver);