BitmapUtils.java 文件源码

/**
 * 旋转bitmap
 *
 * @param origin bitmap
 * @param alpha  旋转角度
 * @return 旋转后的bitmap
 */
public static Bitmap rotateBitmap(Bitmap origin, float alpha) {
    if (origin == null || origin.isRecycled()) {
        return null;
    }
    int width = origin.getWidth();
    int height = origin.getHeight();
    Matrix matrix = new Matrix();
    matrix.setRotate(alpha);
    Bitmap newBM = Bitmap.createBitmap(origin, 0, 0, width, height, matrix, false);
    if (newBM.equals(origin)) {
        return newBM;
    }
    origin.recycle();
    return newBM;
}