android中圆角图片（ImageView）

圆角图片没有生硬的感觉，带来很好的交互感觉，其为自定义代码实现方法，继承ImageView，实现过程如下：

public class RoundImageView extends ImageView {

  public RoundImageView(Context context) {
    super(context);
    // TODO Auto-generated constructor stub
  }

  public RoundImageView(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
  }

  @Override
  protected void onDraw(Canvas canvas) {
    Path clipPath = new Path();
    int w = this.getWidth();
    int h = this.getHeight();
    /**
     * RectF  圆角矩形
     * **/
    clipPath.addRoundRect(new RectF(0, 0, w, h), 4.0f, 4.0f,
        Path.Direction.CW);
    canvas.clipPath(clipPath);
    super.onDraw(canvas);
  }
}

引用实现代码的布局如下：

<com.test.RoundImageView

        android:layout_width="80dp"
        android:layout_height="80dp"
        android:scaleType="centerCrop"
        android:src="@drawable/liushishi" />