自己收藏的几种圆角ImageView方式。

最新推荐文章于 2022-07-09 13:58:58 发布

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最新推荐文章于 2022-07-09 13:58:58 发布

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本文链接：https://blog.youkuaiyun.com/u013109455/article/details/52238514

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一：处理bitmap达到圆角效果

package com.xc.xcskin.view;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * 自定义的圆角矩形ImageView，可以直接当组件在布局中使用。
 * @author caizhiming
 *
 */
public class XCRoundRectImageView extends ImageView{

    private Paint paint;
    
    public XCRoundRectImageView(Context context) {  
        this(context,null);  
    }  
  
    public XCRoundRectImageView(Context context, AttributeSet attrs) {  
        this(context, attrs,0);  
    }  
  
    public XCRoundRectImageView(Context context, AttributeSet attrs, int defStyle) {  
        super(context, attrs, defStyle); 
        paint  = new Paint();
    }  
  
    /**
     * 绘制圆角矩形图片
     * @author caizhiming
     */
    @Override  
    protected void onDraw(Canvas canvas) {  
  
        Drawable drawable = getDrawable();  
        if (null != drawable) {  
            Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();  
            Bitmap b = getRoundBitmap(bitmap, 20);  
            final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight());  
            final Rect rectDest = new Rect(0,0,getWidth(),getHeight());
            paint.reset();  
            canvas.drawBitmap(b, rectSrc, rectDest, paint);  
  
        } else {  
            super.onDraw(canvas);  
        }  
    }  
  
    /**
     * 获取圆角矩形图片方法
     * @param bitmap
     * @param roundPx,一般设置成14
     * @return Bitmap
     * @author caizhiming
     */
    private Bitmap getRoundBitmap(Bitmap bitmap, int roundPx) {  
        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),  
                bitmap.getHeight(), Config.ARGB_8888);  
        Canvas canvas = new Canvas(output);  
          
        final int color = 0xff424242;
       
        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());  
        final RectF rectF = new RectF(rect);
        paint.setAntiAlias(true);  
        canvas.drawARGB(0, 0, 0, 0);  
        paint.setColor(color);  
        int x = bitmap.getWidth(); 
        
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));  
        canvas.drawBitmap(bitmap, rect, rect, paint);  
        return output;  
        
        
    }  
}  
／／这种情况下是处理的圆角的bitmap。存在问题：图片只能为全部显示，而且是fitxy的形式。如果要其他的图片显示方式，不支持。

二：通过设置canves，直接画出圆角控件

  
  @Override
protected void onDraw(Canvas canvas) {
Path clipPath = new Path();
int w = this.getWidth();
int h = this.getHeight();
clipPath.addRoundRect(new RectF(0, 0, w, h), 10.0f, 10.0f, Path.Direction.CW);
canvas.clipPath(clipPath);
super.onDraw(canvas);
}
}
clipPath.addRoundRect(new RectF(0, 0, w, h), 10.0f, 10.0f, Path.Direction.CW);
这行代码操作画出10度的角
可能有一些小问题，因为只画了控件，没有处理bitmap。不太清楚有没有优化问题。
  
  
   
   三：参见弘扬大神微博   给跪！http://blog.youkuaiyun.com/lmj623565791/article/details/41967509