圆角ImageView

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package com.example.ui;import android.R;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.RectF;import android.graphics.Bitmap.Config;import android.util.AttributeSet;import android.widget.ImageView;public class RoundAngleImageView extends ImageView {             private Paint paint;    private int roundWidth = 5;    private int roundHeight = 5;    private Paint paint2;     public RoundAngleImageView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        init(context, attrs);    }     public RoundAngleImageView(Context context, AttributeSet attrs) {        super(context, attrs);        init(context, attrs);    }     public RoundAngleImageView(Context context) {        super(context);        init(context, null);    }     private void init(Context context, AttributeSet attrs) {         if (attrs != null) {            /*TypedArray a = context.obtainStyledAttributes(attrs,                    R.styleable.RoundAngleImageView);            //代码中设置字体大小，读xml配置。            roundWidth = a.getDimensionPixelSize(                    R.styleable.RoundAngleImageView_roundWidth, roundWidth);            roundHeight = a.getDimensionPixelSize(                    R.styleable.RoundAngleImageView_roundHeight, roundHeight);*/        } else {                //获取屏幕分辨率、宽高            float density = context.getResources().getDisplayMetrics().density;            roundWidth = (int) (roundWidth * density);            roundHeight = (int) (roundHeight * density);        }         paint = new Paint();        paint.setColor(Color.WHITE);        //设置画笔的锯齿效果        paint.setAntiAlias(true);        //设置图形重叠时的处理方式        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));         paint2 = new Paint();        paint2.setXfermode(null);    }     @Override    public void draw(Canvas canvas) {        Bitmap bitmap = Bitmap.createBitmap(getWidth(), getHeight(),                Config.ARGB_8888);        Canvas canvas2 = new Canvas(bitmap);        super.draw(canvas2);        drawLiftUp(canvas2);        drawRightUp(canvas2);        drawLiftDown(canvas2);        drawRightDown(canvas2);        canvas.drawBitmap(bitmap, 0, 0, paint2);        bitmap.recycle();    }     private void drawLiftUp(Canvas canvas) {        Path path = new Path();        path.moveTo(0, roundHeight);        path.lineTo(0, 0);        path.lineTo(roundWidth, 0);        path.arcTo(new RectF(0, 0, roundWidth * 2, roundHeight * 2), -90, -90);        path.close();        canvas.drawPath(path, paint);    }     private void drawLiftDown(Canvas canvas) {        Path path = new Path();        path.moveTo(0, getHeight() - roundHeight);        path.lineTo(0, getHeight());        path.lineTo(roundWidth, getHeight());        path.arcTo(new RectF(0, getHeight() - roundHeight * 2,                0 + roundWidth * 2, getWidth()), 90, 90);        path.close();        canvas.drawPath(path, paint);    }     private void drawRightDown(Canvas canvas) {        Path path = new Path();        path.moveTo(getWidth() - roundWidth, getHeight());        path.lineTo(getWidth(), getHeight());        path.lineTo(getWidth(), getHeight() - roundHeight);        path.arcTo(new RectF(getWidth() - roundWidth * 2, getHeight()                - roundHeight * 2, getWidth(), getHeight()), 0, 90);        path.close();        canvas.drawPath(path, paint);    }     private void drawRightUp(Canvas canvas) {        Path path = new Path();        path.moveTo(getWidth(), roundHeight);        path.lineTo(getWidth(), 0);        path.lineTo(getWidth() - roundWidth, 0);        path.arcTo(new RectF(getWidth() - roundWidth * 2, 0, getWidth(),                0 + roundHeight * 2), -90, 90);        path.close();        canvas.drawPath(path, paint);    } }
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