Android之Badge显⽰

Badge概述

所谓Badge,原本是IOS上的一个效果,指的是当手机接收到推送消息后,会在手机桌⾯面对应的App图标的右上角显示一个未读消息数的提⽰。

而在Android系统中，手机桌面的管理是在系统应用Launcher上实现的，然而在原生的Android系统中，Launcher是不提供改功能效果的。但是，由于Android的AOSP(Android开放源码项目)代码能够被各大ROM厂商修改，所以很多被修改的ROM都可以支持这种Badge效果。

基本原理

都是监听App发出的广播，然后根据广播内容进行Launcher层面的快捷方式的修改。

难点

由于没有Android原生系统的支持，所以ROM厂商的实现方式很不统一，基本都是自己做自己的。因此，关键是要找到这些Launcher修改的广播(厂家提供的私有API)。

不同厂商API

• 三星

  String launcherClassName = getLauncherClassName(context);
  if (launcherClassName == null) {
  return;
  }
  Intent intent = new Intent("android.intent.action.BADGE_COUNT_UPDATE");
  intent.putExtra("badge_count", count);
  intent.putExtra("badge_count_package_name", context.getPackageName());
  intent.putExtra("badge_count_class_name", launcherClassName);
  context.sendBroadcast(intent);

• 华为

  String launcherClassName = getLauncherClassName(context);
  if (launcherClassName != null) {
  Bundle extra = new Bundle();
  extra.putString("package", ct.getPackageName());
  extra.putString("class", launcherClassName);
  extra.putInt("badgenumber", count);
  context.getContentResolver().call(Uri.parse("content://com.huawei.android.launcher.settings/badge/"), "change_badge", null, extra);
  }

• MIUI

  • MIUI6以下

  Intent intent = new Intent("android.intent.action.APPLICATION_MESSAGE_UPDATE");
  intent.putExtra("android.intent.action.APPLICATION_MESSAGE_UPDATE","your app packageName/.LAUNCHER ActivityName");
  intent.putExtra(EXTRA_UPDATE_APPLICATION_MESSAGE_TEXT, unreadCount);
  context.sendBroadcast(intent);

  ​

  • MIUI6以上

  NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
                  .setSmallIcon(R.mipmap.ic_launcher)
                  .setContentTitle("小米角标")
                  .setContentText("miui桌面角标消息");
  
          NotificationManagerCompat managerCompat = NotificationManagerCompat.from(context);
          Notification notification = builder.build();
          try {
              Object miuiNotification = Class.forName("android.app.MiuiNotification").newInstance();
              Field field = miuiNotification.getClass().getDeclaredField("messageCount");
              field.setAccessible(true);
              field.set(miuiNotification, Integer.valueOf(count));
              notification.getClass().getField("extraNotification").set(notification, miuiNotification);
              managerCompat.notify(0, notification);
  
          }  catch (Exception e) {
              e.printStackTrace();
          }

  ​

• Sony

  Intent intent = new Intent();
  String launcherclassname = getLauncherClassName(context);
  if (launcherclassname != null) {
  intent.putExtra("com.sonyericsson.home.intent.extra.badge.SHOW_MESSAGE", unReadCount > 0);
  intent.setAction("com.sonyericsson.home.action.UPDATE_BADGE");
  intent.putExtra("com.sonyericsson.home.intent.extra.badge.ACTIVITY_NAME", launcherclassname);
  intent.putExtra("com.sonyericsson.home.intent.extra.badge.MESSAGE", unReadCount < 1 ? "" : unReadCount);
  intent.putExtra("com.sonyericsson.home.intent.extra.badge.PACKAGE_NAME", context.getPackageName());
  context.sendBroadcast(intent);
  }

• VIVO

  String launcherclassname = getLauncherClassName(context);
  if (launcherclassname != null) {
  Intent intent = new Intent("launcher.action.CHANGE_APPLICATION_NOTIFICATION_NUM");
  //Constants.KEY_PKG_NAME = "packageName"
  //Constants.KEY_CLASS_NAME = "className"
  intent.putExtra(Constants.KEY_PKG_NAME, context.getPackageName());
  intent.putExtra(Constants.KEY_CLASS_NAME, launcherclassname);
  intent.putExtra("notificationNum", unReadCount);
  context.sendBroadcast(intent);
  }

• OPPO

  try {
  Bundle extras = new Bundle();
  extras.putInt("app_badge_count", count);
  context.getContentResolver().call(Uri.parse("content://com.android.badge/badge"), "setAppBadgeCount", String.valueOf(count), extras);
  } catch (Throwable th) {}

---

Method: getLauncherClassName

public static String getLauncherClassName(Context context) {
       if(context == null){
           return null;
       }    
        PackageManager pm = context.getPackageManager();
        Intent intent = new Intent("android.intent.action.MAIN");
        intent.addCategory("android.intent.category.LAUNCHER");
        try {
            for (ResolveInfo resolveInfo : pm.queryIntentActivities(intent, 0)) {
                if (resolveInfo.activityInfo.applicationInfo.packageName.equalsIgnoreCase(context.getPackageName())) {
                    return resolveInfo.activityInfo.name;
                }
            }
            return null;
        } catch (Exception e) {
            return null;
        }
    }

​

除了上述的代码，还需要在清单文件声明对应的权限

<uses-permission android:name="com.sonyericsson.home.permission.BROADCAST_BADGE"/>
<uses-permission android:name="com.sec.android.provider.badge.permission.READ"/>
<uses-permission android:name="com.sec.android.provider.badge.permission.WRITE"/>
<uses-permission android:name="com.huawei.android.launcher.permission.CHANGE_BADGE"/>

---

Good Luck !