Question

由于某种原因未调用onReceive方法
我没有应用任何过滤器或任何东西，

这是班级：

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);
    }
}

这是清单中的声明（应用程序的子代）

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

修改： 这是我试图添加的过滤器（在onReceive（）内部）

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

我收到错误：

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

Answer 1

如果您一直想听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(...)。的但

这是我尝试添加的过滤器（在onReceive（）内部
）

在 onReceive()内注册接收器是没有意义的，因为onReceive()在注册接收器之前不会运行......所以它永远不会发生。您可以在活动中将此代码放在onCreate()中，如下所示：

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

这只会在您的应用已经投放时监听ACTION_USER_PRESENT 。

Answer 2

IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(BROADCAST_STARTED_ACTION);
        intentFilter.addAction(BROADCAST_SUCCESS_ACTION);
        intentFilter.addAction(BROADCAST_FAILURE_ACTION);
        LocalBroadcastManager.getInstance(getApplicationContext()).registerReceiver(broadCastReceiver, intentFilter);

为什么onReceive在Android中不被称为扩展BroadcastReceiver

2 个答案: