最近項(xiàng)目上要實(shí)現(xiàn)語音搜索功能，界面樣式要模仿一下UC瀏覽器的樣式，UC瀏覽器中有一個(gè)控件，會隨著聲音大小浮動，然后尋思偷個(gè)懶，百度一下，結(jié)果也沒有找到類似的，只能自己動手了。

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先上圖看我實(shí)現(xiàn)的效果：

這是自定義控件的代碼，里面注釋也很明白，就不費(fèi)話了

public class CustomCircleView extends View{
  private Paint mPaint;
  private int strokeWidth = 0;   //圓環(huán)的寬度
  private Bitmap bitmap = null;  // 圖片位圖
  private int nBitmapWidth = 0;  // 圖片的寬度
  private int nBitmapHeight = 0; // 圖片的高度
  private int width;     //view的寬度
  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();
    //如果布局中沒有設(shè)置bigCircleColor和floatCircleColor的時(shí)候給他一個(gè)默認(rèn)值
    if (bigCircleColor==0){
      bigCircleColor=Color.parseColor("#FFEEF0F1");
    }
    if (floatCircleColor==0){
      floatCircleColor=Color.parseColor("#25c1f5");
    }
    // 獲取圖片高度和寬度
    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);

    //獲取view的高度和寬度 這個(gè)view必須給精確值?。。。。。。?！
    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); // 消除鋸齒
    //繪制最外層灰色大圓
    mPaint.setColor(bigCircleColor);
    mPaint.setStyle(Paint.Style.STROKE);
    mPaint.setStrokeWidth(height/2-nBitmapHeight/2);
    //計(jì)算圓的半徑稍微麻煩點(diǎn)，但是在圖上畫一下應(yīng)該能明白 (height/2-nBitmapHeight/2)/2+nBitmapHeight/2
    canvas.drawCircle(width/2, height/2, (height/2-nBitmapHeight/2)/2+nBitmapHeight/2, mPaint);

    //繪制浮動的圓
    mPaint.setColor(floatCircleColor);
    mPaint.setStyle(Paint.Style.STROKE);
    mPaint.setStrokeWidth(strokeWidth);
    canvas.drawCircle(width/2, height/2, strokeWidth/2+nBitmapHeight/2, mPaint);

    //繪制中間圖標(biāo)
    canvas.drawBitmap(bitmap, width/2-nBitmapWidth/2, height/2-nBitmapHeight/2, mPaint);


  }
  //根據(jù)傳入的寬度重新繪制
  public void setStrokeWidth(int with){
    this.strokeWidth=with;
    invalidate();
  }
}

當(dāng)前名稱：Android自定義控件實(shí)現(xiàn)UC瀏覽器語音搜索效果-創(chuàng)新互聯(lián)
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