Android:如何在不缩放的情况下居中裁剪图像

Bitmap bitmap = BitmapFactory.decodeFile("path_to_image_file");

int targetWidth = 200; // 目标宽度
int targetHeight = 200; // 目标高度
Bitmap croppedBitmap = Bitmap.createBitmap(targetWidth, targetHeight, Bitmap.Config.ARGB_8888);

Canvas canvas = new Canvas(croppedBitmap);

float scale;
float dx = 0, dy = 0;
if (bitmap.getWidth() * targetHeight > targetWidth * bitmap.getHeight()) {
    scale = (float) targetHeight / (float) bitmap.getHeight();
    dx = (targetWidth - bitmap.getWidth() * scale) * 0.5f;
} else {
    scale = (float) targetWidth / (float) bitmap.getWidth();
    dy = (targetHeight - bitmap.getHeight() * scale) * 0.5f;
}

Matrix matrix = new Matrix();
matrix.setScale(scale, scale);
matrix.postTranslate((int) (dx + 0.5f), (int) (dy + 0.5f));
canvas.drawBitmap(bitmap, matrix, new Paint());