update app shortcut icon on android desktop

MainActivity.java

package com.example.dynamicappicon;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.Menu;

public class MainActivity extends Activity {

  @Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		installShortCut();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	
	private void installShortCut(){ 
        Intent shortcutIntent = new Intent("com.android.launcher.action.INSTALL_SHORTCUT"); 
        shortcutIntent.putExtra(Intent.EXTRA_SHORTCUT_NAME, getString(R.string.app_name)); 
        // 是否可以有多个快捷方式的副本，参数如果是true就可以生成多个快捷方式，如果是false就不会重复添加 
        shortcutIntent.putExtra(Intent.EXTRA_SHORTCUT_ICON, generatorContactCountIcon(((BitmapDrawable)(getResources().getDrawable(R.drawable.ic_launcher))).getBitmap())); 
        shortcutIntent.putExtra("duplicate", false); 
        Intent mainIntent = new Intent(Intent.ACTION_MAIN); 
        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER); 

        // 要删除的应用程序的ComponentName，即应用程序包名+activity的名字 
        //intent2.setComponent(new ComponentName(this.getPackageName(), this.getPackageName() + ".MainActivity")); 
        mainIntent.setClass(this, this.getClass()); 

        shortcutIntent.putExtra(Intent.EXTRA_SHORTCUT_INTENT, mainIntent); 
        //shortcutIntent.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, Intent.ShortcutIconResource.fromContext(this, R.drawable.icon)); 
        shortcutIntent.putExtra(Intent.EXTRA_SHORTCUT_ICON, generatorContactCountIcon(((BitmapDrawable)(getResources().getDrawable(R.drawable.ic_launcher))).getBitmap())); 
        sendBroadcast(shortcutIntent); 
    } 
    
    private Bitmap generatorContactCountIcon(Bitmap icon){ 
        //初始化画布 
        int iconSize=(int)getResources().getDimension(android.R.dimen.app_icon_size); 
        Bitmap contactIcon=Bitmap.createBitmap(iconSize, iconSize, Config.ARGB_8888); 
        Canvas canvas=new Canvas(contactIcon); 
         
        //拷贝图片 
        Paint iconPaint=new Paint(); 
        iconPaint.setDither(true);//防抖动 
        iconPaint.setFilterBitmap(true);//用来对Bitmap进行滤波处理，这样，当你选择Drawable时，会有抗锯齿的效果 
        Rect src=new Rect(0, 0, icon.getWidth(), icon.getHeight()); 
        Rect dst=new Rect(0, 0, iconSize, iconSize); 
        canvas.drawBitmap(icon, src, dst, iconPaint); 
         
        //在图片上创建一个覆盖的联系人个数 
        int contacyCount=11; 
        //启用抗锯齿和使用设备的文本字距 
        Paint countPaint=new Paint(Paint.ANTI_ALIAS_FLAG|Paint.DEV_KERN_TEXT_FLAG); 
        countPaint.setColor(Color.RED); 
        countPaint.setTextSize(20f); 
        countPaint.setTypeface(Typeface.DEFAULT_BOLD); 
        canvas.drawText(String.valueOf(contacyCount), iconSize-18, 25, countPaint); 
        return contactIcon; 
    } 
}

MIUI 上不能安装shortcut