[转] Android 检测电源按钮是否被按下

原文地址：https://stackoverflow.com/a/30030372

在 AndroidManifest.xml 文件中追加如下代码：

<service android:name="com.example.userpresent.LockService">
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED" />
    </intent-filter>
</service>

在 MainActivity.java 中追加如下代码，启动 Service：

startService(new Intent(this, LockService.class));

LockService.java

package com.example.userpresent;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Binder;
import android.os.IBinder;
import android.support.annotation.Nullable;

// https://stackoverflow.com/a/30030372
public class LockService extends Service {
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        final IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(Intent.ACTION_USER_PRESENT);
        final BroadcastReceiver mReceiver = new ScreenReceiver();
        registerReceiver(mReceiver, filter);
        return super.onStartCommand(intent, flags, startId);
    }

    public class LocalBinder extends Binder {
        LockService getService() {
            return LockService.this;
        }
    }
}

ScreenReceiver.java

package com.example.userpresent;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.util.Log;

public class ScreenReceiver extends BroadcastReceiver {

    public static boolean wasScreenOn = true;

    @Override
    public void onReceive(final Context context, final Intent intent) {
    Log.e("LOB","onReceive");
        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
            // do whatever you need to do here
            wasScreenOn = false;
            Log.e("LOB","wasScreenOn"+wasScreenOn);
        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
            // and do whatever you need to do here
            wasScreenOn = true;

        }else if(intent.getAction().equals(Intent.ACTION_USER_PRESENT)){
            Log.e("LOB","userpresent");
            Log.e("LOB","wasScreenOn"+wasScreenOn);
            String url = "http://www.stackoverflow.com";
            Intent i = new Intent(Intent.ACTION_VIEW);
            i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            i.setData(Uri.parse(url)); 
            context.startActivity(i); 
        }
    }
}