android 背景圆角以及图片圆角处理

.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;

}