想要访问Android中的电源按钮事件 [英] Want to Access Power Button events in android

问题描述

   i=0;
   public boolean onKeyDown(int keyCode, KeyEvent event) {
    System.out.println("In Key Down Method." + event.getKeyCode());
    if (event.getKeyCode() == KeyEvent.KEYCODE_POWER) {
        i++;
        System.out.println("Power button pressed.");
        if (i == 2) {
            System.out.println("Power button pressed continuoulsy 3 times.");
            Toast.makeText(MainActivity.this, "Power button pressed " + i + " times.", Toast.LENGTH_SHORT).show();
        } else {
            System.out.println("Power button pressed continuoulsy " + i + " times.");
            Toast.makeText(MainActivity.this, "Power button pressed " + i + " times.", Toast.LENGTH_SHORT).show();
        }
    }
    return super.onKeyDown(keyCode, event);
}

我正在尝试使用上述代码访问电源按钮事件。 Volume_Up和Volume_Down键，但不能用于电源/锁定按钮。为什么会发生这种情况？
建议一些示例或代码。

I am trying to access power button event using above code.Its working fine for Volume_Up and Volume_Down Key but not Working For Power/Lock Button.Why it happens? Suggest Some Example or code.

推荐答案

您不能覆盖应用程序中的电源按钮。但是，当您按下电源按钮时，屏幕会打开/关闭。因此，您可以使用广播接收器检测到此情况。

You cannot override the power button press from your application. But when you press power button the screen turns on/off. So you can detect this using a broadcast receiver.

<receiver android:name=".MyBroadCastReciever">
<intent-filter>
    <action android:name="android.intent.action.SCREEN_OFF"/>
    <action android:name="android.intent.action.SCREEN_ON"/>
</intent-filter>
</receiver>

MyBroadCastReciever.java

MyBroadCastReciever.java

public class MyBroadCastReciever extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
        //Take count of the screen off position
    } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
        //Take count of the screen on position
    }
}
}

希望

注意：-为了使广播接收器始终在后台运行。我编写了一个后台服务，该服务不断在后台启动，并增强了我的广播接收器。

Note:-For to keep my broadcast receiver always running in Background.I am written one Background Service which continuously start in background and give boost to my broadcast receiver.

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