無法動態注冊廣播接收器

Question

我正在OnResume中注冊我的接收器，而在OnPause中取消注冊是我的代碼有問題

package com.bd2;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
 import android.provider.Contacts.People;
import android.util.Log;

public class BroadcastReceiver2Activity extends Activity {
/** Called when the activity is first created. */
private NotificationManager mNotificationManager;
private int SIMPLE_NOTFICATION_ID;
IntentFilter intentfilter;



  @Override
   public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    intentfilter = new IntentFilter(); 
    intentfilter.addAction("android.intent.action.AIRPLANE_MODE");


}

 @Override
  protected void onResume() {
    // TODO Auto-generated method stub
   super.onResume();
   /*intfilter = new IntentFilter();
      intfilter.addAction("android.intent.action.AIRPLANE_MODE");*/
   registerReceiver(receiver, intentfilter);
   //       sendBroadcast();

  }

   @Override
    protected void onPause() {
    // TODO Auto-generated method stub
   super.onPause();
    unregisterReceiver(receiver);


    }

   private BroadcastReceiver receiver=new BroadcastReceiver(){


    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        mNotificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
          Notification notifyDetails = new Notification(R.drawable.icon,"Time Reset!",System.currentTimeMillis());
          PendingIntent myIntent = PendingIntent.getActivity(context, 0, new Intent(Intent.ACTION_VIEW, People.CONTENT_URI), 0);
          notifyDetails.setLatestEventInfo(context, "Time has been Reset", "Click on me to view Contacts", myIntent);
          notifyDetails.flags |= Notification.FLAG_AUTO_CANCEL;
          mNotificationManager.notify(SIMPLE_NOTFICATION_ID, notifyDetails);
                Log.i(getClass().getSimpleName(),"Sucessfully Changed Time");
    }

   }; 



   }

////////清單文件

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.bd2"
  android:versionCode="1"
  android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" />

<application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".BroadcastReceiver2Activity"
              android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>

    </activity>



</application>

我沒有收到通知。 如果我是靜態地執行此操作

Answer 1

編輯＃3：定義全局變量：

private IntentFilter mIntentFilter;

從onCreate處理程序中：

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    mIntentFilter.addAction("android.intent.action.SERVICE_STATE");
    mIntentFilter.addAction("android.intent.action.AIRPLANE_MODE");
    registerReceiver(receiver, mIntentfilter);
}

從onResume處理程序中：

@Override
protected void onResume() {
    // TODO Auto-generated method stub
   super.onResume();
    // Be careful here... mIntentFilter might be gc'd! add checking to this!
   registerReceiver(receiver, mIntentFilter);
   Log.d(TAG, "onResume() - Registered!");
}

從onPause處理程序中：

@Override
protected void onPause() {
   // TODO Auto-generated method stub
   unregisterReceiver(receiver);
   Log.d(TAG, "onPause() - Unregistered!");
   super.onPause();
}

從廣播接收器：

private BroadcastReceiver receiver=new BroadcastReceiver(){
@Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        if (intent != null && intent.getAction().equals(Intent.ACTION_AIRPLANE_MODE_CHANGED)){
           Log.d(TAG, "receiver/onReceive() - GOT THE INTENT!!!!");
        }else{
           Log.d(TAG, "receiver/onReceive() - NOPE! NO INTENT!");
        }
        mNotificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
          Notification notifyDetails = new Notification(R.drawable.icon,"Time Reset!",System.currentTimeMillis());
          PendingIntent myIntent = PendingIntent.getActivity(context, 0, new Intent(Intent.ACTION_VIEW, People.CONTENT_URI), 0);
          notifyDetails.setLatestEventInfo(context, "Time has been Reset", "Click on me to view Contacts", myIntent);
          notifyDetails.flags |= Notification.FLAG_AUTO_CANCEL;
          mNotificationManager.notify(SIMPLE_NOTFICATION_ID, notifyDetails);
                Log.i(getClass().getSimpleName(),"Sucessfully Changed Time");
    }

   };

此時，在以編程方式執行此操作時，從清單中刪除意圖接收器（我之前提到過）。 另外，定義權限！

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

Answer 2

對我來說，所有事情看起來都不錯，除了您必須暫停“活動”就無法打開或關閉飛行模式，這會取消接收器的注冊。 當您回到“活動”，繼續並重新注冊時，您已經錯過了廣播。

我不知道您的最終目標是什么，但是如果您希望您的應用接收飛行模式Intent，最好的辦法是在清單中注冊。 （從技術上講，您可以動態地執行此操作，但這需要在比onResume() / onPause()更永久的位置進行注冊/注銷，我認為這並不是您真正想要的。）