Android消息个数提醒控件使用详解

前言

在QQ中有消息个数提醒的控件，虽然现在没用到，但是以后可能会用到，所以就实现它，也不难。

实现

效果图如下：

先贴源码了：

public class TipNumberView extends TextView {  private Paint mBgPaint ;  PaintFlagsDrawFilter pfd;   public TipNumberView(Context context, AttributeSet attrs) {    super(context, attrs);    //初始化画笔    mBgPaint = new Paint();    mBgPaint.setColor(Color.RED);    mBgPaint.setAntiAlias(true);    pfd = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG);   }  public TipNumberView(Context context) {    this(context,null);  }  @Override  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {    super.onMeasure(widthMeasureSpec, heightMeasureSpec);    //得到测量的高度和宽度    int measuredWidth = getMeasuredWidth();    int measuredHeight = getMeasuredHeight();    int max = Math.max(measuredWidth, measuredHeight);    //设置控件区域大小    setMeasuredDimension(max, max);  }  //设置背景颜色  @Override  public void setBackgroundColor(int color){    mBgPaint.setColor(color);  }    public void setNotifiText(int text){    setText(text+"");  }  public void setNotifiText(String text){    setText(text);  }  //绘图  @Override  public void draw(canvas canvas) {    //设置绘图无锯齿    canvas.setDrawFilter(pfd);    canvas.drawCircle(getWidth()/2, getHeight()/2, Math.max(getWidth()/2, getHeight())/2, mBgPaint);    super.draw(canvas);  }}