我有下一个XML drawable blue_button
我有图像button_blue_bg与渐变宽度为1px.
当我设置按钮背景时,我得到下一个图像
如你所见,我的背景没有修剪圆角边框.
我如何需要modificate xml背景渐变图像不在边界外?
我明白为什么它会发生,因为我使用图层 – 所以这就像三明治 – 但我也在目标c上编程,并且它也使用图层.但在苹果公司,它很好.
最佳答案
我使用这个….首先是一个基本定义的图层,将此图层设置为布局的背景:
我用这个函数制作圆角:
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,bitmap.getWidth(),bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = 12;
paint.setAntiAlias(true);
canvas.drawARGB(0,0);
paint.setColor(color);
canvas.drawRoundRect(rectF,roundPx,paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap,rect,paint);
return output ;
}
最后,活动中的代码:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.menu);
// i use a Relative Layout
RelativeLayout rl = (RelativeLayout) findViewById(R.id.rlmenu);
// Obtain then backgroud of RelativeLayout
LayerDrawable layer = (LayerDrawable) rl.getBackground();
// obtain the image set in the Layer
BitmapDrawable bg = (BitmapDrawable) layer.getDrawable(1);
// create a new BitmapDrawable from the function
Drawable d =new BitmapDrawable(getRoundedCornerBitmap(bg.getBitmap()));
// set the new roundcorner image in the layer
layer.setDrawableByLayerId(1,d);
rl.setBackgroundDrawable(d);
}