Android圆角图片封装类

来源：互联网发布：网络安全教育论文编辑：程序博客网时间：2024/06/15 06:03

你还在为处理圆角而在项目里到处copy 处理代码吗？你还在不停动态生成圆角bitmap后再使用吗？no，代码里不需要知道这些，

如果一个view需要圆角，xml直接使用下面的RoundImageView即可，

代码逻辑根本不需要任何干涉，代码中你依然当做这个是一个普通的ImageView完全没有问题，这就是关键。

而且省去了bitmap的动态生成，避免了内存开销，跟界面卡顿（原始处理圆角的方法，再处理图片比较多的时候，如果不用单独thread性能并不好）

注：如果你想让一个布局you圆角效果也是完全做到的，用这个思路即可，或者@我qq群：37493362，呼呼

标签： Android

[1].[文件] RoundImageView.java ~ 2KB 下载(107) 跳至 [1]

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packagecom.phodev.andtools.widget;
 
importandroid.content.Context;
importandroid.graphics.Canvas;
importandroid.graphics.Color;
importandroid.graphics.Paint;
importandroid.graphics.PorterDuff;
importandroid.graphics.PorterDuffXfermode;
importandroid.graphics.RectF;
importandroid.util.AttributeSet;
importandroid.widget.ImageView;
 
/**
 * 圆角ImageView
 *
 * @author skg
 *
 */
publicclass RoundImageView extendsImageView {
 
    publicRoundImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }
 
    publicRoundImageView(Context context) {
        super(context);
        init();
    }
 
    privatefinal RectF roundRect = newRectF();
    privatefloat rect_adius = 6;
    privatefinal Paint maskPaint = newPaint();
    privatefinal Paint zonePaint = newPaint();
 
    privatevoid init() {
        maskPaint.setAntiAlias(true);
        maskPaint.setXfermode(newPorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        //
        zonePaint.setAntiAlias(true);
        zonePaint.setColor(Color.WHITE);
        //
        floatdensity = getResources().getDisplayMetrics().density;
        rect_adius = rect_adius * density;
    }
 
    publicvoid setRectAdius(floatadius) {
        rect_adius = adius;
        invalidate();
    }
 
    @Override
    protectedvoid onLayout(booleanchanged, intleft, inttop, intright,
            intbottom) {
        super.onLayout(changed, left, top, right, bottom);
        intw = getWidth();
        inth = getHeight();
        roundRect.set(0,0, w, h);
    }
 
    @Override
    publicvoid draw(Canvas canvas) {
        canvas.saveLayer(roundRect, zonePaint, Canvas.ALL_SAVE_FLAG);
        canvas.drawRoundRect(roundRect, rect_adius, rect_adius, zonePaint);
        //
        canvas.saveLayer(roundRect, maskPaint, Canvas.ALL_SAVE_FLAG);
        super.draw(canvas);
        canvas.restore();
    }
 
}

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