Rotate Image without losing resolution

Question

I am having problem while rotating an Image Bitmap.When I rotate Image it lose its resolution.I want to rotate image everytime when user click on Button.Code on button's click is here:

matrix.postRotate(90);

bitmap = Bitmap.createBitmap(bitmap_rotate, 0, 0, bitmap_rotate.getwidth(),bitmap_rotate.getHeight(),matrix, true);
d_reflect = new BitmapDrawable(bitmap);

image_view.removeAllViews();
image_view.setBackgroundDrawable(d_reflect);

Where image_view is LinearLayout and I want to set rotate LinearLayout.It lose its resolution everytime I rotate image.My original bitmap size is 300x300.I have googled a lot to find solution but none of them worked for me. Any solution will be appreciated.Thanks in advance..

Answer 1

Here is the code for rotating an image smoothly inside an imageview without creating an extra Bitmap.

Matrix m = new Matrix();
m.setRotate(degrees);
image_view.setImageMatrix(m);

Answer 2

创建具有所需宽度和高度的缩放位图：

Bitmap bmp = Bitmap.createScaledBitmap(bitmap_rotate, 300, 300, false);