如何通过BroadcastReciver把应用从后台前台 [英] How to bring application from background to foreground via BroadcastReciver
问题描述
我有两个班这是MainActivity和MyBroadcastReceiver。广播接收器检测手机屏幕是否打开或关闭。我的愿望是,每当屏幕锁被释放启动我的申请。我的意思是我要带上我的应用程序到前台时,手机锁版本。
I have two classes which are MainActivity and MyBroadcastReceiver. BroadcastReceiver detects whether phone screen is on or off. My desire is to launch my application whenever screen lock is released. I mean that I want to bring my application to the front when phone lock releases.
下面是我的活动类:
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
registerReceiver();
}
private void registerReceiver(){
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
BroadcastReceiver mReceiver = new MyPhoneReceiver();
registerReceiver(mReceiver, filter);
}
}
这是我的广播接收器:
And here is my broadcast receiver :
public class MyPhoneReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
if(pm.isScreenOn()){
//Bring application front
}
}
}
那我为了我的广播接收机执行该操作呢?
What am I supposed to do in order to perform this operation in my broadcast receiver?
先谢谢了。
推荐答案
不要在你的广播接收器的方法的onReceive以下
Do the following in your onReceive method of the BroadcastReceiver
@Override
public void onReceive(Context context, Intent intent) {
Intent newIntent = new Intent();
newIntent.setClassName("com.your.package", "com.your.package.MainActivity");
newIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
context.startActivity(newIntent);
}
您需要的标志FLAG_ACTIVITY_NEW_TASK为你的意图,否则会有被抛出致命异常。搜索结果
标志FLAG_ACTIVITY_SINGLE_TOP就是把你MainActivity到前面,您可以继续通过MainActivity覆盖onNewIntent方法做任何你从那里想。
You need the flag "FLAG_ACTIVITY_NEW_TASK" for your intent otherwise there will be a fatal exception being thrown.
The flag "FLAG_ACTIVITY_SINGLE_TOP" is to bring your MainActivity to the front and you can proceed to do whatever you want from there by overriding the onNewIntent method in MainActivity.
@Override
protected void onNewIntent(Intent intent) {
// continue with your work here
}
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