实现Android图片圆角

 这里介绍一个主要的方法，也是从网上找的，在此整理出来。。。以备不时之需

/**
 * 将图片设置为圆角
 */
public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {
	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 = pixels;
	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;
}

 

当我们需要圆角的时候，调用这个方法，第一个参数是传入需要转化成圆角的图片，第二个参数是圆角的度数，数值越大，圆角越大

下面兴趣个例子，我有一个LinearLayout，我想把它的背景图片设置成圆角

布局文件main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout  
   xmlns:android="http://schemas.android.com/apk/res/android"    
   android:id="@+id/layout"    android:orientation="vertical"    
   android:layout_width="wrap_content"    
   android:layout_height="wrap_content">
</LinearLayout>

mInflater = LayoutInflater.from(this);
		
Drawable drawable = getResources().getDrawable(R.drawable.icon);
BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
Bitmap bitmap = bitmapDrawable.getBitmap();
		
View view = mInflater.inflate(
	R.layout.share_xiaohua_revert_lv_item_top, null);
ImageView mImageView = (ImageView) view
	.findViewById(R.id.lv_xiaohua_image);
mImageView.setImageBitmap(toRoundCorner(bitmap, 30));