现在Android中有许多的应用仿苹果的在应用图标上显示小红点。当然有着一些手机ROM对小红点的支持，比如小米，三星等。google的api是没有提供这项工能的,这项功能一般都是厂商自己定制的,所以让开发者着实头痛,我也是弄了2天,不是所有的机型都可以.以后再一点点完善吧.希望对读文章的人,或也在受此困惑的人有点帮助!

效果图:(DODO那个是我的应用,小米miui8测试)

GIF.gif

直接上代码吧,代码中有注释:

BadgeUtil类:

public class BadgeUtil {
    private BadgeUtil() throws InstantiationException {
        throw new InstantiationException("This class is not for instantiation");
    }

    /**
     * 设置Badge 目前支持Launcher
     */
    public static void setBadgeCount(Context context, int count, int iconResId) {
        if (count <= 0) {
            count = 0;
        } else {
            count = Math.max(0, Math.min(count, 99));
        }

        if (Build.MANUFACTURER.equalsIgnoreCase("xiaomi")) {
            setBadgeOfMIUI(context, count, iconResId);
        } else if (Build.MANUFACTURER.equalsIgnoreCase("sony")) {
            setBadgeOfSony(context, count);
        } else if (Build.MANUFACTURER.toLowerCase().contains("samsung") ||
                Build.MANUFACTURER.toLowerCase().contains("lg")) {
            setBadgeOfSumsung(context, count);
        } else if (Build.MANUFACTURER.toLowerCase().contains("htc")) {
            setBadgeOfHTC(context, count);
        } else if (Build.MANUFACTURER.toLowerCase().contains("nova")) {
            setBadgeOfNova(context, count);
        }else if (Build.MANUFACTURER.toLowerCase().contains("OPPO")) {//oppo
            //setBadgeOfOPPO(context, count);
        }else if (Build.MANUFACTURER.toLowerCase().contains("LeMobile")) {//乐视

        }
        else if (Build.MANUFACTURER.toLowerCase().contains("vivo")) {
            setBadgeOfVIVO(context, count);
        }else if (Build.MANUFACTURER.toLowerCase().contains("HUAWEI")||Build.BRAND.equals("Huawei")||Build.BRAND.equals("HONOR")) {//华为
            setHuaweiBadge(context, count);
        }else if (Build.MANUFACTURER.toLowerCase().contains("")) {//魅族

        }else if (Build.MANUFACTURER.toLowerCase().contains("")) {//金立

        }else if (Build.MANUFACTURER.toLowerCase().contains("")) {//锤子

        }else {
            //Toast.makeText(context, "Not Found Support Launcher", Toast.LENGTH_LONG).show();
        }
    }

    /**
     * 设置MIUI的Badge
     */
    private static void setBadgeOfMIUI(Context context, int count, int iconResId) {
        NotificationManager mNotificationManager = (NotificationManager) context
                .getSystemService(Context.NOTIFICATION_SERVICE);
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
        builder.setContentTitle("标题").setContentText("消息正文").setSmallIcon(iconResId);
        Notification notification = builder.build();
        try {
            Field field = notification.getClass().getDeclaredField("extraNotification");
            Object extraNotification = field.get(notification);
            Method method = extraNotification.getClass().getDeclaredMethod("setMessageCount", int.class);
            method.invoke(extraNotification, count);
        } catch (Exception e) {
            e.printStackTrace();
        }
        mNotificationManager.notify(0, notification);
    }

    /**
     * 设置索尼的Badge
     * 需添加权限：<uses-permission android:name="com.sonyericsson.home.permission.BROADCAST_BADGE" />
     */
    private static void setBadgeOfSony(Context context, int count) {
        String launcherClassName = getLauncherClassName(context);
        if (launcherClassName == null) {
            return;
        }
        boolean isShow = true;
        if (count == 0) {
            isShow = false;
        }
        Intent localIntent = new Intent();
        localIntent.setAction("com.sonyericsson.home.action.UPDATE_BADGE");
        localIntent.putExtra("com.sonyericsson.home.intent.extra.badge.SHOW_MESSAGE", isShow);//是否显示
        localIntent.putExtra("com.sonyericsson.home.intent.extra.badge.ACTIVITY_NAME", launcherClassName);//启动页
        localIntent.putExtra("com.sonyericsson.home.intent.extra.badge.MESSAGE", String.valueOf(count));//数字
        localIntent.putExtra("com.sonyericsson.home.intent.extra.badge.PACKAGE_NAME", context.getPackageName());//包名
        context.sendBroadcast(localIntent);
    }

    /**
     * 设置三星的Badge\设置LG的Badge
     */
    private static void setBadgeOfSumsung(Context context, int count) {
        // 获取你当前的应用
        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);
    }

    /**
     * 设置HTC的Badge
     */
    private static void setBadgeOfHTC(Context context, int count) {
        Intent intentNotification = new Intent("com.htc.launcher.action.SET_NOTIFICATION");
        ComponentName localComponentName = new ComponentName(context.getPackageName(), getLauncherClassName(context));
        intentNotification.putExtra("com.htc.launcher.extra.COMPONENT", localComponentName.flattenToShortString());
        intentNotification.putExtra("com.htc.launcher.extra.COUNT", count);
        context.sendBroadcast(intentNotification);

        Intent intentShortcut = new Intent("com.htc.launcher.action.UPDATE_SHORTCUT");
        intentShortcut.putExtra("packagename", context.getPackageName());
        intentShortcut.putExtra("count", count);
        context.sendBroadcast(intentShortcut);
    }

    /**
     * 设置Nova的Badge
     */
    private static void setBadgeOfNova(Context context, int count) {
        ContentValues contentValues = new ContentValues();
        contentValues.put("tag", context.getPackageName() + "/" + getLauncherClassName(context));
        contentValues.put("count", count);
        context.getContentResolver().insert(Uri.parse("content://com.teslacoilsw.notifier/unread_count"),
                contentValues);
    }

    /**
     * 设置vivo的Badge :vivoXplay5 vivo x7无效果
     */
    private static void setBadgeOfVIVO(Context context,int count){
        try {
            Intent intent = new Intent("launcher.action.CHANGE_APPLICATION_NOTIFICATION_NUM");
            intent.putExtra("packageName", context.getPackageName());
            String launchClassName = context.getPackageManager().getLaunchIntentForPackage(context.getPackageName()).getComponent().getClassName();
            intent.putExtra("className", launchClassName); intent.putExtra("notificationNum", count);
            context.sendBroadcast(intent);
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    /**
     *设置oppo的Badge :oppo角标提醒目前只针对内部软件还有微信、QQ开放，其他的暂时无法提供
     */
    private static void setBadgeOfOPPO(Context context,int count){
        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 (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 设置华为的Badge :mate8 和华为 p7,honor畅玩系列可以,honor6plus 无效果
     */
    public static void setHuaweiBadge(Context context, int count)
    {
        try {
            Bundle bundle = new Bundle();
            bundle.putString("package", context.getPackageName());
            String launchClassName = context.getPackageManager().getLaunchIntentForPackage(context.getPackageName()).getComponent().getClassName();
            bundle.putString("class", launchClassName);
            bundle.putInt("badgenumber", count);
            context.getContentResolver().call(Uri.parse("content://com.huawei.android.launcher.settings/badge/"), "change_badge", null, bundle);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void setBadgeOfMadMode(Context context, int count, String packageName, String className) {
        Intent intent = new Intent("android.intent.action.BADGE_COUNT_UPDATE");
        intent.putExtra("badge_count", count);
        intent.putExtra("badge_count_package_name", packageName);
        intent.putExtra("badge_count_class_name", className);
        context.sendBroadcast(intent);
    }

    /**
     * 重置Badge
     */
    public static void resetBadgeCount(Context context, int iconResId) {
        setBadgeCount(context, 0, iconResId);
    }

    public static String getLauncherClassName(Context context) {
        PackageManager packageManager = context.getPackageManager();
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.setPackage(context.getPackageName());
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        ResolveInfo info = packageManager.resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);
        if (info == null) {
            info = packageManager.resolveActivity(intent, 0);
        }
        return info.activityInfo.name;
    }
}

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"/>
    <!-- 申请华为角标权限  -->
    <uses-permission android:name="com.huawei.android.launcher.permission.CHANGE_BADGE"/>
    <uses-permission android:name="com.huawei.android.launcher.permission.READ_SETTINGS" />
    <uses-permission android:name="com.huawei.android.launcher.permission.WRITE_SETTINGS" />

总结:

小米,三星,索尼,htc,朵唯.手中有的手机基本小红点功能都是没有问题的.
oppo:厂商不提供此功能,只对于市面上排名前5的商用聊天提供,还说对企业内部的im会提供此功能,不过必须要集成oppo证书.
华为:与oppo说法一样,但是按上面代码测试,华为的部分机型是可以实现的.荣耀6和6p没有效果.
vivo:部分手机有效果,vivo xplay5 x7 没有效果.
至于锤子,魅族,金立等,网上说是不支持此功能的,,因为没有测试机,并没有验证.
乐视:有自带效果(没有询问客服,就不给人添乱了!)
希望对广大开发者有帮助!