android 背景圆角以及图片圆角处理

　导读：1.配置文件实现 <?xml version="1.0" encoding="utf-8"?>  <layer-list xmlns:android="http://schemas.android.com/apk/res/andro
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1.配置文件实现
<?xml version="1.0" encoding="utf-8"?> 
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"> 
<item android:drawable="@drawable/icon_home_button_img"/> 
<item android:drawable="@drawable/icon_home_shape_overlay"/> </layer-list> 
icon_home_shape_overlay如下
<?xml version="1.0" encoding="utf-8"?> 
<shape xmlns:android="http://schemas.android.com/apk/res/android"> 
<solid android:color="#60000000"/> 
<stroke android:width="3dp" color="#ff000000"/> 
<corners android:radius="10dp" /> 
</shape> 
或者直接使用一种效果
<?xml version="1.0" encoding="UTF-8"?> 
<shape xmlns:android="http://schemas.android.com/apk/res/android"> 
<solid android:color="#99FFFFFF"/> 
<corners android:radius="30px"/> 
<padding android:left="0dp" android:top="0dp" android:right="0dp" android:bottom="0dp" /> 
</shape>
然后 android:background="@drawable/my_shape_file" 




2.图片本身加上圆角
Bitmap myCoolBitmap = ... ; // <-- Your bitmap you want rounded 
int w = myCoolBitmap.getWidth(), h = myCoolBitmap.getHeight(); 


Bitmap rounder = Bitmap.createBitmap(w,h,Bitmap.Config.ARGB_8888); 
Canvas canvas = new Canvas(rounder);   


Paint xferPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 
xferPaint.setColor(Color.RED); 


canvas.drawRoundRect(new RectF(0,0,w,h), 20.0f, 20.0f, xferPaint); 


xferPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN)); 
canvas.drawBitmap(myCoolBitmap, 0,0, null); 
canvas.drawBitmap(rounder, 0, 0, xferPaint); 
或者
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {
    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
        bitmap.getHeight(), Config.ARGB_8888);
    Canvas canvas = new Canvas(output);


    final int color = 0xff424242;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
    final RectF rectF = new RectF(rect);
    final float roundPx = 12;


    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawRoundRect(rectF, roundPx, roundPx, paint);


    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint);


    return output;
}