Android自定义控件实现UC浏览器语音搜索效果

public class CustomCircleView extends View{  private Paint mPaint;  private int strokeWidth = 0;   //圆环的宽度  private Bitmap bitmap = null;  // 图片位图  private int nBitmapWidth = 0;  // 图片的宽度  private int nBitmapHeight = 0; // 图片的高度  private int width;     //view的宽度  private int height ;    //view的高度  private int bigCircleColor =0;    //view的高度  private int floatCircleColor =0;    //view的高度  public CustomCircleView(Context context) {    this(context, null);  }  public CustomCircleView(Context context, AttributeSet attrs) {    this(context, attrs, 0);  }  public CustomCircleView(Context context, AttributeSet attrs, int defStyleAttr) {    super(context, attrs, defStyleAttr);    TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CustomCircleView, defStyleAttr, 0);    int n = a.getIndexCount();    for (int i = 0; i < n; i++)    {      int attr = a.getIndex(i);      switch (attr)      {        case R.styleable.CustomCircleView_icon:          bitmap = BitmapFactory.decodeResource(getResources(), a.getResourceId(attr, 0));          break;        case R.styleable.CustomCircleView_bigCircleColor:          bigCircleColor = a.getColor(attr, Color.GRAY);          break;        case R.styleable.CustomCircleView_floatCircleColor:          floatCircleColor = a.getColor(attr,Color.GREEN);          break;      }    }    a.recycle();    mPaint = new Paint();    //如果布局中没有设置bigCircleColor和floatCircleColor的时候给他一个默认值    if (bigCircleColor==0){      bigCircleColor=Color.parseColor("#FFEEF0F1");    }    if (floatCircleColor==0){      floatCircleColor=Color.parseColor("#25c1f5");    }    // 获取图片高度和宽度    nBitmapWidth = bitmap.getWidth();    nBitmapHeight = bitmap.getHeight();  }  @Override  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {    int widthMode = MeasureSpec.getMode(widthMeasureSpec);    int widthSize = MeasureSpec.getSize(widthMeasureSpec);    int heightMode = MeasureSpec.getMode(heightMeasureSpec);    int heightSize = MeasureSpec.getSize(heightMeasureSpec);    //获取view的高度和宽度 这个view必须给精确值！！！！！！！！    if (widthMode == MeasureSpec.EXACTLY) {      width = widthSize;    }    if (heightMode == MeasureSpec.EXACTLY)    {      height = heightSize;    }    setMeasuredDimension(width, height);  }  @Override  protected void onDraw(Canvas canvas) {    super.onDraw(canvas);    mPaint.setAntiAlias(true); // 消除锯齿    //绘制最外层灰色大圆    mPaint.setColor(bigCircleColor);    mPaint.setStyle(Paint.Style.STROKE);    mPaint.setStrokeWidth(height/2-nBitmapHeight/2);    //计算圆的半径稍微麻烦点，但是在图上画一下应该能明白 (height/2-nBitmapHeight/2)/2+nBitmapHeight/2    canvas.drawCircle(width/2, height/2, (height/2-nBitmapHeight/2)/2+nBitmapHeight/2, mPaint);    //绘制浮动的圆    mPaint.setColor(floatCircleColor);    mPaint.setStyle(Paint.Style.STROKE);    mPaint.setStrokeWidth(strokeWidth);    canvas.drawCircle(width/2, height/2, strokeWidth/2+nBitmapHeight/2, mPaint);    //绘制中间图标    canvas.drawBitmap(bitmap, width/2-nBitmapWidth/2, height/2-nBitmapHeight/2, mPaint);  }  //根据传入的宽度重新绘制  public void setStrokeWidth(int with){    this.strokeWidth=with;    invalidate();  }}