/** 
  * 繪制圖標(biāo)右上角的未讀消息數(shù)量顯示 
  * 
  * @param context 
  *   上下文 
  * @param icon 
  *   需要被添加的icon的資源ID 
  * @param news 
  *   未讀的消息數(shù)量 
  * @return drawable 
  */ 
 @SuppressWarnings("unused") 
 public static Drawable displayNewsNumber(Context context, int icon, int news) { 
  // 初始化畫(huà)布 
  int iconSize = (int) context.getResources().getDimension( 
    android.R.dimen.app_icon_size); 
  // Bitmap contactIcon = Bitmap.createBitmap(iconSize, iconSize, 
  // Config.ARGB_8888); 
  Bitmap iconBitmap = BitmapFactory.decodeResource( 
    context.getResources(), icon); 
  Canvas canvas = new Canvas(iconBitmap); 
  // 拷貝圖片 
  Paint iconPaint = new Paint(); 
  iconPaint.setDither(true);// 防抖動(dòng) 
  iconPaint.setFilterBitmap(true);// 用來(lái)對(duì)Bitmap進(jìn)行濾波處理 
  Rect src = new Rect(0, 0, iconBitmap.getWidth(), iconBitmap.getHeight()); 
  Rect dst = new Rect(0, 0, iconBitmap.getWidth(), iconBitmap.getHeight()); 
  canvas.drawBitmap(iconBitmap, src, dst, iconPaint); 
  // 啟用抗鋸齒和使用設(shè)備的文本字距 
  Paint countPaint = new Paint(Paint.ANTI_ALIAS_FLAG 
    | Paint.DEV_KERN_TEXT_FLAG); 
  countPaint.setColor(Color.RED); 
  canvas.drawCircle(iconSize - 13, 20, 10, countPaint); 

  Paint textPaint = new Paint(); 
  textPaint.setColor(Color.WHITE); 
  // textPaint.setTypeface(Typeface.DEFAULT_BOLD); 
  textPaint.setTextSize(19f); 
  canvas.drawText(String.valueOf(news), iconSize - 18, 27, textPaint); 
  return new BitmapDrawable(iconBitmap); 
 } 

if (count > 0) {//顯示右上角未讀消息提示 
   Drawable mineDrawable = BitmapUtil.displayNewsNumber(this, 
     R.drawable.icon_mine, count); 
   mineButton.setCompoundDrawablesWithIntrinsicBounds(null, null, 
     null, mineDrawable);//這里就是設(shè)置背景，自行發(fā)揮。 
  } else {//隱藏 
   Drawable defaultDrawable = getResources().getDrawable( 
     R.drawable.icon_mine); 
   mineButton.setCompoundDrawablesWithIntrinsicBounds(null, null, 
     null, defaultDrawable); 
  }