棒棒糖上未显示推送通知内容文本

如何解决棒棒糖上未显示推送通知内容文本

// receiverUid = unique uid for a receiver
// notificationUid = unique notification_uid
// receiverName,title,body are String variables.
NotificationCompat.Builder groupBuilder =
                new NotificationCompat.Builder(this,"NOTIFICATION_CHANNEL")
                        .setSmallIcon(R.drawable.ic_app_icon_24)
                        .setColor(ColorUtils.getColor(getApplicationContext(),R.color.blue_700))
                        .setGroupSummary(true)
                        .setGroup(receiverUid)
                        .setAutoCancel(true)
                        .setSubText(receiverName)
                        .setContentIntent(pendingIntentGroup);

        NotificationCompat.Builder builder =
                new NotificationCompat.Builder(this,R.color.blue_700))
                        .setContentTitle(title)
                        .setContentText(body)
                        .setPriority(NotificationCompat.PRIORITY_DEFAULT)
                        .setContentIntent(pendingIntentNotification)
                        .setGroup(receiverUid)
                        .setSubText(receiverName)
                        .setAutoCancel(true);

        notificationmanagerCompat notificationmanager = notificationmanagerCompat.from(this);

// group notification is based on receiverUid,so the notifications are grouped under different receipients
        notificationmanager.notify(receiverUid,groupBuilder.build());
        notificationmanager.notify(receiverUid + "_" + notificationUid,builder.build());

这在更高的 android 版本上工作正常，但对于 Lollipop 版本不显示通知文本。这是 Lollipop 设备上的屏幕截图：

我调试并验证了文本传递到这里。请建议。提前致谢。

解决方法

来自官方doc：

设置小组总结

在 Android 7.0（API 级别 24）及更高版本上，系统会自动使用来自每个小组的文本片段为您的小组构建摘要通知。用户可以展开此通知以查看每个单独通知，如图1所示。支持旧的版本，不能显示一组嵌套的通知，您必须创建一个额外的通知作为摘要。这显示为唯一的通知，系统隐藏所有其他通知。所以这摘要应包括所有其他通知的片段，用户可以点击它来打开您的应用

文本未显示，因为 groupBuilder 是显示的那个并且它不包含任何文本，因此对于较低版本的 API 27 将您的文本添加到 groupBuilder 或创建一个样式来总结其他通知的内容例如：

NotificationCompat.Builder groupBuilder =
                new NotificationCompat.Builder(this,"NOTIFICATION_CHANNEL")
                        .setSmallIcon(R.drawable.ic_app_icon_24)
                        .setColor(ColorUtils.getColor(getApplicationContext(),R.color.blue_700))
                        .setGroupSummary(true)
                        .setGroup(receiverUid)
                        .setAutoCancel(true)
                        .setSubText(receiverName)
                        .setContentIntent(pendingIntentGroup)
                        .setStyle(new NotificationCompat.InboxStyle()
                                 .addLine("Alex Faarborg  Check this out")
                                 .setBigContentTitle("2 new messages")
                                 .setSummaryText("janedoe@example.com"));

更新： 在样式中实现通知计数和消息摘要

public class MainActivity extends AppCompatActivity {

    private int notificationCount = 0;
    private NotificationCompat.InboxStyle style;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // also you can Save the Notification count on the sharePreference
        // for simulate the notification with multiple message
        String[][] person = {{"Bill","Jones"},{"Janet","Kline"},{"George","Bailey"},{"Ellan","Sanches"},{"Tom","Nguyen"},{"William","Walters"},{"Author","James"},{"Henry","Daniels"},{"Mike","Franklin"},{"Julie","Andrews"}};

        // i have just testing with the TimeDownCount to add notifications every 20 seconds
        CountDownTimer countDownTimer = new CountDownTimer(2000,10) {
            @Override
            public void onTick(long millisUntilFinished) {

            }

            @Override
            public void onFinish() {
                // get random person from the array person 
                Random random = new Random();
                int randomInt = random.nextInt(person.length - 1);
                // show notification
                showNotification(person[randomInt][0] + " " + person[randomInt][1]);
                if (notificationCount < 10) {
                    this.start();
                }
            }
        };
        countDownTimer.start();
        style = new NotificationCompat.InboxStyle();
    }


    private void showNotification(String message) {
        notificationCount++;
        
        style.addLine(message); // add person to the style 
        style.setBigContentTitle(notificationCount + " new messages"); // show Notification count in the Title

        NotificationCompat.Builder groupBuilder =
                new NotificationCompat.Builder(this,"NOTIFICATION_CHANNEL")
                        .setSmallIcon(R.drawable.ic_baseline_mic_24)
                        .setColor(Color.BLUE)
                        .setGroupSummary(true)
                        .setGroup("receiverUid")
                        .setAutoCancel(true)
                        .setStyle(style)
                        .setSubText("Your Action");

        NotificationCompat.Builder builder =
                new NotificationCompat.Builder(this,"NOTIFICATION_CHANNEL")
                        .setSmallIcon(R.drawable.ic_baseline_mic_24)
                        .setColor(Color.BLUE)
                        .setContentTitle("title")
                        .setContentText("body")
                        .setPriority(NotificationCompat.PRIORITY_DEFAULT)
                        .setGroup("receiverUid")
                        .setSubText("receiverName")
                        .setAutoCancel(true);

        NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
        notificationManager.notify("receiverUid",groupBuilder.build());
        notificationManager.notify("receiverUid" + "_" + "notificationUid",builder.build());
    }

}

代码工作原理概述：