自定义view之自定义圆角矩形imageview

import android.content.Context;import android.graphics.Canvas;import android.graphics.Path;import android.os.Build;import android.support.v7.widget.AppCompatImageView;import android.util.AttributeSet;import android.view.View;public class CustomRoundAngleImageView extends AppCompatImageView {    float width, height;    public CustomRoundAngleImageView(Context context) {        this(context, null);        init(context, null);    }    public CustomRoundAngleImageView(Context context, AttributeSet attrs) {        this(context, attrs, 0);        init(context, attrs);    }    public CustomRoundAngleImageView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init(context, attrs);    }    private void init(Context context, AttributeSet attrs) {        if (Build.VERSION.SDK_INT < 18) {            setLayerType(View.LAYER_TYPE_SOFTWARE, null);        }    }    @Override    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {        super.onLayout(changed, left, top, right, bottom);        width = getWidth();        height = getHeight();    }    @Override    protected void onDraw(Canvas canvas) {        if (width >= 12 && height > 12) {            Path path = new Path();            //四个圆角            path.moveTo(12, 0);            path.lineTo(width - 12, 0);            path.quadTo(width, 0, width, 12);            path.lineTo(width, height - 12);            path.quadTo(width, height, width - 12, height);            path.lineTo(12, height);            path.quadTo(0, height, 0, height - 12);            path.lineTo(0, 12);            path.quadTo(0, 0, 12, 0);            canvas.clipPath(path);        }        super.onDraw(canvas);    }}
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