如何检测电源连接状态?

建立一个 BroadcastReceiver 对于 ACTION_BATTERY_CHANGED Intent extra将告诉您充电状态是什么—请参阅 BatteryManager 详情。

<application android:icon="@drawable/icon" android:label="@string/app_name">
    <receiver android:name=".receiver.PlugInControlReceiver">
        <intent-filter>
            <action android:name="android.intent.action.ACTION_POWER_CONNECTED" />
            <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED" />
        </intent-filter>
    </receiver>
</application>

在代码中

public class PlugInControlReceiver extends BroadcastReceiver {
   public void onReceive(Context context , Intent intent) {
       String action = intent.getAction();

       if(action.equals(Intent.ACTION_POWER_CONNECTED)) {
           // Do something when power connected
       }
       else if(action.equals(Intent.ACTION_POWER_DISCONNECTED)) {
           // Do something when power disconnected
       }
   }
}

public class PowerUtil {
    public static boolean isConnected(Context context) {
        Intent intent = context.registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
        int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
        return plugged == BatteryManager.BATTERY_PLUGGED_AC || plugged == BatteryManager.BATTERY_PLUGGED_USB;
    }
}

读取值here:ex.

通过android shell:

cat /sys/class/power_supply/usb/online

cat/sys/class/电源/ac/在线

1=已连接,0=未连接。反映交流连接状态。

下面是一个Android API示例:

File aFile = new File("/sys/class/power_supply/ac/online");
try {
    BufferedReader br = new BufferedReader(new FileReader(aFile));
    char aBuff[] = new char[1];
    int aCount = br.read(aBuff,0, 1);
    Log.d(TAG, "run: Res:"+new String(aBuff));
}catch(Exception e){
    Log.d(TAG, "Exception:Error:run: "+e.toString());
}

还有一件事,您必须检查清单中是否有错误--->应用程序。 如果然后单击显示错误的字段,只需单击链接“Name” 然后出现添加类的对话框。添加类并在类中复制接收时的代码。即上述代码应复制到类文件中,而不是主要活动中。 谢谢