由于某种原因未调用onReceive方法
我没有应用任何过滤器或其他任何东西,
这是类(class):
import java.util.ArrayList;
import java.util.Calendar;
import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.Context;
import android.util.Log;
public class RegisterListener extends BroadcastReceiver {
private final int DELAY_TIME = 5;
private int m_seconds = 0;
private int m_minutes = 0;
private int m_hours = 0;
static ArrayList<BroadcastReceiverListener> listeners = new ArrayList<BroadcastReceiverListener>();
@Override
public void onReceive(Context context, Intent intent) {
Log.d("ScreenReceiver Action:",intent.getAction());
Calendar c = Calendar.getInstance();
m_seconds = c.get(Calendar.SECOND);
m_minutes = c.get(Calendar.MINUTE);
m_hours = c.get(Calendar.HOUR);
for (BroadcastReceiverListener listener:listeners){
listener.onReceive(m_hours, m_minutes, m_seconds);
}
}
public static void addBroadcastReceiveListener (BroadcastReceiverListener listener){
if(!listeners.contains(listener)){
listeners.add(listener);
}
}
public void removeBroadcastReceiveListener (BroadcastReceiverListener listener){
if(listeners.contains(listener)){
listeners.remove(listener);
}
}
这是 list 中的声明(Application的子代)
<receiver android:name=".RegisterListener"></receiver>
编辑:
这是我尝试添加的过滤器(在onReceive()里面)
IntentFilter filter = new IntentFilter(Intent.ACTION_USER_PRESENT);
BroadcastReceiver mReceiver = new RegisterListener();
registerReceiver(mReceiver, filter);
我得到一个错误:
The method registerReceiver(BroadcastReceiver, IntentFilter) is undefined for the type RegisterListener
最佳答案
如果您始终想听ACTION_USER_PRESENT
,请尝试:
<receiver android:name=".RegisterListener">
<intent-filter>
<action android:name="android.intent.action.USER_PRESENT" />
</intent-filter>
</receiver>
说明
The method registerReceiver(BroadcastReceiver, IntentFilter) is undefined for the type RegisterListener
您必须将
registerReceiver()
与上下文一起使用,例如context.registerReceiver(...)
。 但是:在
onReceive()
中注册接收器没有任何意义,因为在注册接收器之前onReceive()
不会运行...因此永远不会发生。您可以将以下代码放在“Activity ”中的onCreate()
中,如下所示:IntentFilter filter = new IntentFilter(Intent.ACTION_USER_PRESENT);
BroadcastReceiver mReceiver = new RegisterListener();
registerReceiver(mReceiver, filter);
这只会在您的应用程序已经运行时监听
ACTION_USER_PRESENT
。关于android - 为什么onReceive在Android中不称为扩展BroadcastReceiver,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/15706537/