如何使用GCM获取消息发送？

Question

我想在android的通知区域显示通知消息。现在这个显示只应用标题。 我正在寻找logcat，但我没有看到从行System.out.println（newMessage）没有System.out输出;

我有这个类：

/** 
* Author  : Taufan E. 
* App Name  : The Restaurant App 
* Release Date : October 2012 
*/ 
package com.the.restaurant; 


public class Home extends Activity { 


    String gcm_regId=""; 

    static DBHelper dbhelper; 
    MainMenuAdapter mma; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.home); 




     //GCMRegistrar.unregister(this); 
     // Make sure the device has the proper dependencies. 
       GCMRegistrar.checkDevice(this); 

       // Make sure the manifest was properly set - comment out this line 
       // while developing the app, then uncomment it when it's ready. 
       //GCMRegistrar.checkManifest(this); 



       gcm_regId = GCMRegistrar.getRegistrationId(this); 
       if(gcm_regId.equals("")){ 
        GCMRegistrar.register(this, Utils.SENDER_ID); 
       } 
       System.out.println(gcm_regId); 

       registerReceiver(mHandleMessageReceiver, new IntentFilter("com.the.restaurant.DISPLAY_MESSAGE")); 

     if (!Utils.isNetworkAvailable(Home.this)) { 
      Toast.makeText(Home.this, getString(R.string.no_internet), Toast.LENGTH_SHORT).show(); 
     } 

     mma = new MainMenuAdapter(this); 
     dbhelper = new DBHelper(this); 
     listMainMenu.setAdapter(mma); 

    } 
    @Override 
    protected void onPause(){ 
     super.onPause(); 
     unregisterReceiver(mHandleMessageReceiver); 
    } 

    @Override 
    protected void onResume(){ 
     super.onResume(); 
     registerReceiver(mHandleMessageReceiver, new IntentFilter("com.the.restaurant.DISPLAY_MESSAGE")); 
    } 

    private void displayNotification(final Context theContext,String message){ 
     long when = System.currentTimeMillis(); 
     int icon = R.drawable.cover_image; 

     NotificationManager notificationManager = (NotificationManager) 
       theContext.getSystemService(Context.NOTIFICATION_SERVICE); 
     Notification notification = new Notification(icon, message, when); 

     String title = theContext.getString(R.string.app_name); 

     Intent notificationIntent = new Intent(); 
     // set intent so it does not start a new activity 
     notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP); 
     PendingIntent intent = PendingIntent.getActivity(theContext, 0, notificationIntent, 0); 
     notification.setLatestEventInfo(theContext, title, message, intent); 
     notification.flags |= Notification.FLAG_AUTO_CANCEL; 

     // Play default notification sound 
     notification.defaults |= Notification.DEFAULT_SOUND; 

     // Vibrate if vibrate is enabled 
     notification.defaults |= Notification.DEFAULT_VIBRATE; 
     notificationManager.notify(0, notification); 
    } 

    private final BroadcastReceiver mHandleMessageReceiver = new BroadcastReceiver() { 
     @Override 
     public void onReceive(Context context, Intent intent) { 
      String newMessage = intent.getExtras().getString("rezervare"); 

      // Waking up mobile if it is sleeping 
      WakeLocker.acquire(getApplicationContext()); 

      /** 
      * Take appropriate action on this message 
      * depending upon your app requirement 
      * For now i am just displaying it on the screen 
      * */ 

      // Showing received message 
      //lblMessage.append(newMessage + "\n"); 
      System.out.println(newMessage); 
      Toast.makeText(getApplicationContext(), "New Message: " + newMessage, Toast.LENGTH_LONG).show(); 

      displayNotification(context,newMessage); 
      //sendnotification("The Restaurant App","Mesaj"); 
      //GCMRegistrar.unregister(Reservation.class); 
      // Releasing wake lock 
      WakeLocker.release(); 
     } 
    }; 
} 

Answer 1

你需要先构建通知：

// Pop up Notification 
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this) 
     .setSmallIcon(R.drawable.ic_launcher) 
     .setContentTitle("New Notification Title") 
     .setContentText("This is notification content."); 
// Creates an explicit intent for an Activity in your app 
Intent resultIntent = new Intent(this, ClassToLaunch.class); 

// The stack builder object will contain an artificial back stack for the 
// started Activity. 
// This ensures that navigating backward from the Activity leads out of 
// your application to the Home screen. 
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this); 
// Adds the back stack for the Intent (but not the Intent itself) 
stackBuilder.addParentStack(ClassToLaunch.class); 
// Adds the Intent that starts the Activity to the top of the stack 
stackBuilder.addNextIntent(resultIntent); 
PendingIntent resultPendingIntent = 
     stackBuilder.getPendingIntent(
      0, 
      PendingIntent.FLAG_UPDATE_CURRENT 
     ); 

mBuilder.setContentIntent(resultPendingIntent); 
NotificationManager mNotificationManager = 
    (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); 

mNotificationManager.notify("tag", mBuilder.build()); 

Answer 2

根据你的问题，你不能看到下面一行输出：

 System.out.println(newMessage); 

而且你想显示通知，我可以看到将会显示后，下面的方法是执行：

displayNotification(context,newMessage); 

答：

你期望要执行的代码是一个BroadcastReceiver的的onReceive方法，这意味着该方法时，一个特殊的意图产生它的onReceive将被称为下已注册到您的onCreate方法就行了：

registerReceiver(mHandleMessageReceiver, new IntentFilter("com.the.restaurant.DISPLAY_MESSAGE")); 

您可以播放通过以下方式意图：

Intent intent = new Intent(); 
    intent.setAction("com.the.restaurant.DISPLAY_MESSAGE"); 
    sendBroadcast(intent); ///sendBroadcast is a Context (Activity) method