Android应用程序显示未读消息计数

在build.gradle下添加依赖

compile 'me.leolin:ShortcutBadger:1.1.16@aar'

显示

ShortcutBadger.applyCount(context, num);

删除

ShortcutBadger.removeCount(context);

附SharedPreferences工具类

创建Application

public class MyApplication extends Application {
    private static Context mTotalContext;

    private static int nScreenWidth;
    /**
     * 屏幕高度
     */
    private static int nScreenHeight;
    private List activityList = new LinkedList();
    private static MyApplication instance;


    @Override
    public void onCreate() {

        super.onCreate();
        mTotalContext = this.getApplicationContext();
    }

    //     版本号
    public static int getVersionCode() {
        try {
            return mTotalContext.getPackageManager().getPackageInfo(mTotalContext.getPackageName(), 0).versionCode;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return 0;
    }

    //    版本名称
    public static String getVersionName() {
        try {
            return mTotalContext.getPackageManager().getPackageInfo(mTotalContext.getPackageName(), 0).versionName;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 获取屏幕宽高
     */
    public static void initScreen(Activity mActivity) {
        DisplayMetrics dm = new DisplayMetrics();
        mActivity.getWindowManager().getDefaultDisplay().getMetrics(dm);
        MyApplication.setnScreenWidth(dm.widthPixels);
        MyApplication.setnScreenHeight(dm.heightPixels);
//        Log.v("lg", "屏幕高和宽。。。" + dm.heightPixels + "....." + dm.widthPixels);
    }

    public static Context getTotalContext() {
        return mTotalContext;
    }


    /**
     * 设置屏幕宽度，在MainActivity,LoadingActivity调用
     */
    public static void setnScreenWidth(int nScreenWidth) {
        MyApplication.nScreenWidth = nScreenWidth;
        if (nScreenWidth != 0)
//            SpsUtil.editInt(R.string.SCREEN_WIDTH, nScreenWidth);
            ShareUtil.sharedPint("www", nScreenWidth);
    }

    public static int getnScreenWidth() {
        if (nScreenWidth == 0)
//            nScreenWidth = SpsUtil.getInt(R.string.SCREEN_WIDTH);
            nScreenHeight= ShareUtil.getSharedInt("www");
        return nScreenWidth;
    }

    /**
     * 设置屏幕高度，在MainActivity,LoadingActivity调用
     */
    public static void setnScreenHeight(int nScreenHeight) {
        MyApplication.nScreenHeight = nScreenHeight;
        if (nScreenHeight != 0)
//            SpsUtil.editInt(R.string.SCREEN_HEIGHT, nScreenHeight);
            ShareUtil.sharedPint("hhh", nScreenHeight);
    }

    public static int getnScreenHeight() {
        if (nScreenHeight == 0)
//            nScreenHeight = SpsUtil.getInt(R.string.SCREEN_HEIGHT);
            nScreenHeight= ShareUtil.getSharedInt("hhh");
        return nScreenHeight;
    }
}

创建ShareUtil

public class ShareUtil {

    private static SharedPreferences sp;
    private static Context mContext;
    // preferences.edit().clear().commit();  清空数据
    private static void initContext() {
        if (mContext == null){
            mContext = MyApplication.getTotalContext();
            sp= mContext.getSharedPreferences("lg", 0);
        }

    }

    public static int  getSharedInt(String key){
        initContext();
        int re = 0;
        re = sp.getInt(key, 0);
        return re;
    }

    public static int getSharedInt(int nResID) {
        initContext();
        return sp.getInt(mContext.getString(nResID), 0);

    }

    public static String getSharedString(int nResID) {
        initContext();
        return sp.getString(mContext.getString(nResID), "");
    }


    public static String getSharedString(String key){
        initContext();
        String s = sp.getString(key,"");
        return s;
    }

    public static long getSharedlong(String key){
        initContext();
        long s = sp.getLong(key, 0);
        return s;
    }
    public static long getSharedlong(int nResID){
        initContext();
        long s = sp.getLong(mContext.getString(nResID), 0);
        return s;
    }

    public static void sharedPint(String key,int value){
        initContext();
        SharedPreferences.Editor editor = sp.edit();
        editor.putInt(key, value);
        editor.commit();
    }

    public static void sharedPint(int nResID, int content) {
        initContext();
        sp.edit().putInt(mContext.getString(nResID), content).commit();
    }

    public static void sharedPstring(int nResID, String strContent) {
        initContext();
        if (TextUtils.isEmpty(strContent))
            strContent = "";
        sp.edit().putString(mContext.getString(nResID), strContent).commit();
    }

    public static void editLong(int nResID, long content) {
        initContext();
        sp.edit().putLong(mContext.getString(nResID), content).commit();
    }

    public static void editLong(String strKey, long content) {
        initContext();
        sp.edit().putLong(strKey, content).commit();
    }


    public static void sharedPstring(String key,String value){
        initContext();
        SharedPreferences.Editor editor = sp.edit();
        editor.putString(key,value);
        editor.commit();
    }
    public static void deleP(){
        initContext();
        sp = mContext.getSharedPreferences("lg",0);
        sp.edit().clear().commit();
    }
}

使用

int num = ShareUtil.getSharedInt("num");
num++;
ShareUtil.sharedPint("num",num);
ShortcutBadger.applyCount(context, num);