android 监听电源键

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MainActivity.java

package com.example.androidtest;import android.os.Bundle;import android.os.PowerManager;import android.app.Activity;import android.content.Intent;import android.view.Menu;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);startService(new Intent(this, MainService.class));}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.activity_main, menu);return true;}}

MainService.java

package com.example.androidtest;import android.app.Service;import android.content.Intent;import android.content.IntentFilter;import android.os.IBinder;import android.util.Log;public class MainService extends Service {private String tag="test";@Overridepublic void onCreate() {// TODO Auto-generated method stubsuper.onCreate();Log.i(tag, "onCreate");MainReciver r= new MainReciver();IntentFilter filter= new IntentFilter();filter.addAction(Intent.ACTION_SCREEN_OFF);filter.addAction(Intent.ACTION_SCREEN_ON);registerReceiver(r,filter);}@Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubLog.i(tag, "onBind");return null;}@Overridepublic void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();}@Overridepublic void onLowMemory() {// TODO Auto-generated method stubsuper.onLowMemory();}}

MainReciver.java

package com.example.androidtest;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.os.PowerManager;import android.util.Log;public class MainReciver extends BroadcastReceiver {String tag = "test";@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubLog.i(tag, intent.getAction());PowerManager pm =(PowerManager)context.getSystemService(Context.POWER_SERVICE);if(pm.isScreenOn()){Log.e(tag, "ScreenOn");}else{Log.e(tag, "ScreenOff");}}}

代码很简单。有问题欢迎留言。