圆角图片github项目：RoundAngleImageView 【常用】

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import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;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.util.AttributeSet;import android.widget.ImageView;public class RoundAngleImageView extends ImageView {    private Paint paint;    private int roundWidth = 10;    private int roundHeight = 10;    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) {        float density = context.getResources().getDisplayMetrics().density;        roundWidth = (int) (roundWidth * density);        roundHeight = (int) (roundHeight * density);        paint = new Paint();        paint.setColor(Color.WHITE);        paint.setAntiAlias(true);        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,                        getHeight()),                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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