Various methods of Android for image data conversion
- 2020-06-12 10:36:12
- OfStack
Image processing is a very common thing in Android, so here are some hands-on methods for processing image data.
To Bitmap
Turn Bitmap RGB value
private Bitmap createColorBitmap(String rgb, int width, int height) {
Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
int color = Color.parseColor(rgb);
bmp.eraseColor(color);
return bmp;
}
//Usage
Bitmap bmp = createColorBitmap("#cce8cf", 200, 50);
Turn Bitmap Color value
private Bitmap createColorBitmap(int color, int width, int height) {
Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bmp.eraseColor(color);
return bmp;
}
//Usage
Bitmap bmp = createColorBitmap(Color.BLUE, 200, 50);
Byte array to Bitmap
private Bitmap getBitmapFromByteArray(byte[] array) {
return BitmapFactory.decodeByteArray(array, 0, array.length);
}
Read file to Bitmap
private Bitmap getBitmapFromFile(String pathName) {
return BitmapFactory.decodeFile(pathName);
}
Read resource to Bitmap
private Bitmap getBitmapFromResource(Resources res, int resId) {
return BitmapFactory.decodeResource(res, resId);
}
Input flow Bitmap
private Bitmap getBitmapFromStream(InputStream inputStream) {
return BitmapFactory.decodeStream(inputStream);
}
Turn Drawable Bitmap
Bitmap icon = BitmapFactory.decodeResource(context.getResources(),R.drawable.icon_resource);
To Drawable
Resource over Drawable
Drawable drawable = getResources().getDrawable(R.drawable.ic_launcher);
Turn Bitmap Drawable
Drawable d = new BitmapDrawable(getResources(),bitmap);
The picture is shown with rounded corners
The image data bitmap can be processed, where pixels is the radius of the corner.
public static Bitmap getRoundedCornerBitmap(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;
}