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
}
}
}