android - 为什么在Android中不调用onReceive扩展BroadcastReceiver

Question

由于某些原因没有调用 onReceive 方法
我没有应用任何过滤器或任何东西，

这是类:

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(应用程序的子级)

<receiver android:name=".RegisterListener"></receiver>

编辑:这是我尝试添加的过滤器(在 onReceive() 内)

    IntentFilter filter = new IntentFilter(Intent.ACTION_USER_PRESENT);
    BroadcastReceiver mReceiver = new RegisterListener();
    registerReceiver(mReceiver, filter);

我收到一个错误:

The method registerReceiver(BroadcastReceiver, IntentFilter) is undefined for the type RegisterListener

Answer 1

如果您总是想监听 ACTION_USER_PRESENT，请尝试:

<receiver android:name=".RegisterListener">
    <intent-filter>
        <action android:name="android.intent.action.USER_PRESENT" />
    </intent-filter>
</receiver>

---

解释

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:

This is the filter i tried to add (inside the onReceive() )

在 onReceive() 中注册一个接收器是没有意义的，因为 onReceive() 在您注册一个接收器之前不会运行接收器...所以它永远不会发生。您可以将这段代码放在 Activity 的 onCreate() 中，如下所示:

IntentFilter filter = new IntentFilter(Intent.ACTION_USER_PRESENT);
BroadcastReceiver mReceiver = new RegisterListener();
registerReceiver(mReceiver, filter);

这只会监听ACTION_USER_PRESENT当您的应用已经在运行时。