Android角标未读数显示问题

第一步：

package com.netease.nim.uikit.common.framework.infra;

import android.content.Context;
import android.os.Handler;
import android.os.HandlerThread;
import android.text.TextUtils;

import java.util.HashMap;

public final class Handlers {
    public static final String DEFAULT_TAG = "Default";

    private static Handlers instance;

    public static synchronized Handlers sharedInstance() {
        if (instance == null) {
            instance = new Handlers();
        }

        return instance;
    }

    private static Handler sharedHandler;

    /**
     * get shared handler for main looper
     *
     * @param context
     * @return
     */
    public static final Handler sharedHandler(Context context) {
        /**
         * duplicate handlers !!! i don't care
         */

        if (sharedHandler == null) {
            sharedHandler = new Handler(context.getMainLooper());
        }

        return sharedHandler;
    }

    /**
     * get new handler for main looper
     *
     * @param context
     * @return
     */
    public static final Handler newHandler(Context context) {
        return new Handler(context.getMainLooper());
    }

    private Handlers() {

    }

    /**
     * get new handler for a background default looper
     *
     * @return
     */
    public final Handler newHandler() {
        return newHandler(DEFAULT_TAG);
    }

    /**
     * get new handler for a background stand alone looper identified by tag
     *
     * @param tag
     * @return
     */
    public final Handler newHandler(String tag) {
        return new Handler(getHandlerThread(tag).getLooper());
    }

    private final HashMap<String, HandlerThread> threads = new HashMap<String, HandlerThread>();

    private final HandlerThread getHandlerThread(String tag) {
        HandlerThread handlerThread = null;

        synchronized (threads) {
            handlerThread = threads.get(tag);

            if (handlerThread == null) {
                handlerThread = new HandlerThread(nameOfTag(tag));

                handlerThread.start();

                threads.put(tag, handlerThread);
            }
        }

        return handlerThread;
    }

    private final static String nameOfTag(String tag) {
        return "HT-" + (TextUtils.isEmpty(tag) ? DEFAULT_TAG : tag);
    }
}

第二步:

api "me.leolin:ShortcutBadger:1.1.22@aar"

第三步：

package com.netease.nim.uikit.common.badger;

import android.os.Handler;
import android.util.Log;

import com.netease.nim.uikit.common.framework.infra.Handlers;

import me.leolin.shortcutbadger.ShortcutBadger;

/**
 * APP图标未读数红点更新接口
 * https://github.com/leolin310148/ShortcutBadger
 * <p>
 * Created by huangjun on 2017/7/25.
 */

public class Badger {

    private static final String TAG = "Badger";

    private static Handler handler;

    private static boolean support = true;

    public static void updateBadgerCount(final int unreadCount,Context context) {
        if (!support) {
            return; // O版本及以上不再支持
        }
        if (handler == null) {
            handler = Handlers.sharedInstance().newHandler("Badger");
        }
        handler.removeCallbacksAndMessages(null);
        handler.postDelayed(new Runnable() {

            @Override
            public void run() {
                int badgerCount = unreadCount;
                if (badgerCount < 0) {
                    badgerCount = 0;
                } else if (badgerCount > 99) {
                    badgerCount = 99;
                }
                boolean res = ShortcutBadger.applyCount(context, badgerCount);
                if (!res) {
                    support = false; // 如果失败就不要再使用了!
                }
                Log.i(TAG, "update badger count " + (res ? "success" : "failed"));
            }
        }, 200);
    }
}

第四步：在需要的地方使用

Badger.updateBadgerCount(unreadNum);

目前：
1.oppo不开放数字角标的功能。

2. vivo之前是不开放角标的，现在官方文档里开放了角标并且提供了对应的方法，与华为用法差不多，不过存在一定的限制条件。一、不能使用vivo自身的推送渠道，二、手机需要8.0及以上的Android版本。
   3.小米提前把手机的通知过滤给关掉，不然只会有通知不会有角标显示。