智能家居越来越流行，在智能家居中我们常要表现一些数据的百分比 圆形度条中间加个图是一种很流行的自己定义View

1.第一步 你首先须要对类进行继承View

public class CircleProgressImageView extends View

public CircleProgressImageView(Context context) {
    this(context,null);
}

public CircleProgressImageView(Context context, AttributeSet attrs) {
    this(context, attrs,0);
}

public CircleProgressImageView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init(context,attrs,defStyleAttr);
}

private void init(Context context, AttributeSet attrs, int defStyleAttr) {
    this.context=context;
    /**
     * 获取自己定义属性
     */
    TypedArray a=context.obtainStyledAttributes(attrs,R.styleable.CIRCLEPROGRESSIMAGEVIEWATTRS);
    bitmap=a.getResourceId(R.styleable.CIRCLEPROGRESSIMAGEVIEWATTRS_imagers,R.mipmap.ic_launcher);
    /**
     * 把图片资源转为Bitmap对象
     */
    drawBitmap=BitmapFactory.decodeResource(context.getResources(),bitmap);
    /**
     * 初始化RectF对象
     */
    mRectF=new RectF();
    mPaint=new Paint();
    mPaint.setAntiAlias(true);

}

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    /**
     * 获取当前View的宽高
     */
    width=this.getWidth();
    height=this.getHeight();
    /**
     * 对其左右上下进行处理
     */
    mRectF.left=mCircleStoreWidth/2;
    mRectF.top=mCircleStoreWidth/2;
    mRectF.right=width-mCircleStoreWidth/2;
    mRectF.bottom=width-mCircleStoreWidth/2;
}

5.这时候我们须要对ondraw（）方法进行绘制了

protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    canvas.drawColor(Color.TRANSPARENT);

    //画圆北京
    mPaint.setColor(getResources().getColor(R.color.orange));
    mPaint.setStyle(Paint.Style.STROKE);
    mPaint.setStrokeWidth(mCircleStoreWidth);
    canvas.drawArc(mRectF,-90,360,false,mPaint);
    /**
     * 画圆弧的进度显示
     */
    mPaint.setColor(getResources().getColor((R.color.gray)));
    canvas.drawArc(mRectF,-90,((float) mProcessValue/mMaxProcessValue)*360,false,mPaint);
    Log.d(TAG,((float) mProcessValue/mMaxProcessValue)*360+"");
    /**
     * 画中间的图
     */
    float imageLeft=width/2-drawBitmap.getWidth()/2;
    float imageTop=height/2-drawBitmap.getHeight()/2;
    canvas.drawBitmap(drawBitmap,imageLeft,imageTop,mPaint);
}

可是这个View是不会转动的 仅仅有通过MainActivity在线程中设置setmProcessValue(processValue)调用改变值就能够转动了。

源代码下载