android - NotificationManager.notify 创建*最初*缺少 contentText 的通知

Question

向通知列表/栏发布推送通知时，.contentText 和 .number 最初不显示(.ticker、.icon 和 .contentTitle 显示正常)。但是，在发布另一个通知(具有不同的 ID)后，当第一个通知在列表中被下调时，它会显示内容文本和数字。然后新的缺少文本，等等。

由于我使用毫秒计时器来创建唯一 ID，我认为我不可能以某种方式更新上一篇文章。所以我一定是一开始就发布了一些错误的东西，以至于不知何故导致它丢失了文本，直到它不再是最新的。

该问题只发生在某些设备上——主要是在 nexus 平板电脑(运行 4.2.2)上。在大多数手机上似乎工作正常。在任何给定的设备上，它要么总是有效，要么永远无效。从这个意义上说，它不是间歇性的。

这是响应推送并发布到通知中心的代码。

public class GcmBroadcastReceiver extends BroadcastReceiver {
   static final String TAG = "GmcBroadcastReceiver";
   Context ctx;

   @Override
   public void onReceive(Context context, Intent intent) {
       GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(context);
       ctx = context;
       String messageType = gcm.getMessageType(intent);
       if (GoogleCloudMessaging.MESSAGE_TYPE_SEND_ERROR.equals(messageType)) 
           Log.i(TAG, "PUSH RECEIVED WITH ERROR: " + intent.getExtras().toString());
       else if (GoogleCloudMessaging.MESSAGE_TYPE_DELETED.equals(messageType)) 
           Log.i(TAG, "DELETED PUSH MESSAGE: " + intent.getExtras().toString());
       else
       {
           Log.i(TAG, "Received PUSH: " + intent.getExtras().toString());
           if (MyApp.isAppForeground == false)
              postNotification(intent.getExtras());
       }
       setResultCode(Activity.RESULT_OK);
   }

  // post GCM message to notification center.
  private void postNotification(Bundle data) {
     String msg = data.getString("alert");
     Log.i(TAG, "message: " + msg);

     if (msg == null)  // on app startup, this was always getting called with empty message
        return;

     int badge = Integer.parseInt(data.getString("badge","0"));

     Intent intent = new Intent(ctx, WordChums.class);
     PendingIntent contentIntent = PendingIntent.getActivity(ctx, 0, intent, 0); //, data);

     Uri sound = Uri.parse("android.resource://com.peoplefun.wordchums/raw/push");
     NotificationCompat.Builder builder = new NotificationCompat.Builder(ctx)
     .setSmallIcon(R.drawable.ic_stat_gcm)
     .setContentTitle("Word Chums")
     .setContentText(msg)
     .setTicker(msg)
     .setStyle(new NotificationCompat.BigTextStyle())
     .setAutoCancel(true)
     .setOnlyAlertOnce(true)
     .setSound(sound)
     .setDefaults(Notification.DEFAULT_VIBRATE); 
     if (badge > 0)
        builder.setNumber(badge);

     builder.setContentIntent(contentIntent);
     NotificationManager notificationManager = (NotificationManager)ctx.getSystemService(Context.NOTIFICATION_SERVICE);
     notificationManager.notify((int)System.currentTimeMillis(), builder.build());
  }
}

打印的日志条目符合预期。

I/GmcBroadcastReceiver( 2081): Received PUSH: Bundle[{gm=37206155, collapse_key=do_not_collapse, alert=TestUser said: 'Message 1', sound=push, badge=6, from=550952899880, pfok=1, ct=1}]
I/GmcBroadcastReceiver( 2081): message: TestUser said: 'Message 1'
I/GmcBroadcastReceiver( 2081): Received PUSH: Bundle[{gm=37206155, collapse_key=do_not_collapse, alert=TestUser said: 'Message 2', sound=push, badge=6, from=550952899880, pfok=1, ct=1}]
I/GmcBroadcastReceiver( 2081): message: TestUser said: 'Message 2'
I/GmcBroadcastReceiver( 2081): Received PUSH: Bundle[{gm=37206155, collapse_key=do_not_collapse, alert=TestUser said: 'Message 3', sound=push, badge=6, from=550952899880, pfok=1, ct=1}]
I/GmcBroadcastReceiver( 2081): message: TestUser said: 'Message 3'

Answer 1

有可能你的contentText在支持大文本样式的设备上没有显示，那是因为你没有设置大文本就将样式设置为BigTextStyle。

代替

.setStyle(new NotificationCompat.BigTextStyle())

你应该试试

.setStyle(new NotificationCompat.BigTextStyle().bigText(msg))

这解释了为什么在某些设备上您没有遇到问题:

NotificationCompat.BigTextStyle

Helper class for generating large-format notifications that include a lot of text. If the platform does not provide large-format notifications, this method has no effect. The user will always see the normal notification view.

这解释了为什么在某些设备上您会这样做:

public NotificationCompat.BigTextStyle bigText (CharSequence cs)

Provide the longer text to be displayed in the big form of the template in place of the content text.

引自 here .