Question

我正在使用兼容性库实现Android丰富的通知，所以我的所有通知都是使用android.support.v4.app.NotificationCompat.Builder构建的

我正在使用的代码如下：

  // Base notification
  NotificationCompat.Builder b = new NotificationCompat.Builder(context);
  b.setSmallIcon(R.drawable.ic_actionbar);
  b.setContentTitle(title);
  b.setContentText(Html.fromHtml(msg));
  b.setTicker(title);
  b.setWhen(System.currentTimeMillis());
  b.setDeleteIntent(getDismissNotificationsPendingIntent(quantity));
  b.setLargeIcon(Picasso.with(context).load(iconUrl).get());

  // BigPictureStyle
  NotificationCompat.BigPictureStyle s = new NotificationCompat.BigPictureStyle();
  if (expandedIconUrl != null) {
      s.bigLargeIcon(Picasso.with(context).load(expandedIconUrl).get());
  } else if (expandedIconResId > 0) {
      s.bigLargeIcon(BitmapFactory.decodeResource(context.getResources(), expandedIconResId));
  }
  s.bigPicture(Picasso.with(context).load(bigImageUrl).get());
  b.setStyle(s);
  b.setContentIntent( // some intent
  b.addAction(R.drawable.ic_notification_ // some action
  Notification n = b.build();

  // and go ahead to show it

如果显示图像不兼容，基本上没有加载任何图像，所以我们不会无缘无故地使用内存，但这是基础，我期待类似于右边的通知以下图片

enter image description here

问题在于消息（在示例“触摸以查看屏幕截图。”）显示通知何时签约，但是当通知扩展时，消息消失。

我忘记拨打任何setMessage()方法吗？这是NotificationCompat的错误吗？谁能在这里提供一些见解？

Answer 1

是否有任何我忘记调用的setMessage（）方法？

是的！ NotificationCompat.BigPictureStyle setSummaryText

Answer 2

 mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 mNotificationManager.notify(0, setBigPictureStyleNotification()); 

private Notification setBigPictureStyleNotification() {
    Bitmap remote_picture = null;

    // Create the style object with BigPictureStyle subclass.
    NotificationCompat.BigPictureStyle notiStyle = new NotificationCompat.BigPictureStyle();
    notiStyle.setBigContentTitle("Big Picture Expanded");
    notiStyle.setSummaryText("Nice big picture.");

    try {
        remote_picture = BitmapFactory.decodeStream((InputStream) new      URL(sample_url).getContent());
    } catch (IOException e) {
        e.printStackTrace();
    }

    // Add the big picture to the style.
    notiStyle.bigPicture(remote_picture);

    // Creates an explicit intent for an ResultActivity to receive.
    Intent resultIntent = new Intent(this, ResultActivity.class);

    // This ensures that the back button follows the recommended convention for the back key.
    TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);

    // Adds the back stack for the Intent (but not the Intent itself).
    stackBuilder.addParentStack(ResultActivity.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);

    return new NotificationCompat.Builder(this)
            .setSmallIcon(R.drawable.ic_launcher)
            .setAutoCancel(true)
            .setLargeIcon(remote_picture)
            .setContentIntent(resultPendingIntent)
            .addAction(R.drawable.ic_launcher, "One", resultPendingIntent)
            .addAction(R.drawable.ic_launcher, "Two", resultPendingIntent)
            .addAction(R.drawable.ic_launcher, "Three", resultPendingIntent)
            .setContentTitle("Big Picture Normal")
            .setContentText("This is an example of a Big Picture Style.")
            .setStyle(notiStyle).build();
}

Android通知BigPictureStyle消失文本

2 个答案: