如何在Android中获知屏幕打开或者关闭

在有些Android 应用中需要在屏幕打开或者关闭的时候进行一些处理，下面介绍一个在android应用程序中捕获屏幕打开或者关闭动作的方法：

首先创建ScreenReceiver 类，该类继承自BroadcastReceiver ，并实现其 onReceive 方法，在该类当中可判断屏幕事件的类型，并添加相关的代码。

public class ScreenReceiver extends BroadcastReceiver {

    @Override

    public void onReceive(Context context, Intent intent) {

        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {

            // do whatever you need to do here

        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {

            // and do whatever you need to do here

然后在Activity中注册 BroadcastReceiver 并设置其IntenFilter

public class ExampleActivity extends Activity {

    @Override

    protected void onCreate() {

        // initialize receiver

        IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);

        filter.addAction(Intent.ACTION_SCREEN_OFF);

        BroadcastReceiver mReceiver = new ScreenReceiver();

        registerReceiver(mReceiver, filter);

        // your code

     // your code

}

如果需要在service当中捕获屏幕打开或者关闭事件，可参照以下方法：

public class ScreenReceiver extends BroadcastReceiver {

    private boolean screenOff;

    @Override

    public void onReceive(Context context, Intent intent) {

        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {

            screenOff = true;

        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {

            screenOff = false;

        Intent i = new Intent(context, UpdateService.class);

        i.putExtra("screen_state", screenOff);

        context.startService(i);

对应的 service样例代码如下：

public static class UpdateService extends Service {

        @Override

        public void onCreate() {

            super.onCreate();

            // register receiver that handles screen on and screen off logic

            IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);

            filter.addAction(Intent.ACTION_SCREEN_OFF);

            BroadcastReceiver mReceiver = new ScreenReceiver();

            registerReceiver(mReceiver, filter);

         @Override

        public void onStart(Intent intent, int startId) {

            boolean screenOn = intent.getBooleanExtra("screen_state", false);

            if (!screenOn) {

                // your code

            } else {

                // your code

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