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所以，我正在缩小位图文件，这样我就可以在不超过内存大小的情况下显示图像。我在这里参考了 android 教程。

我发现，这不仅缩小了我的图像尺寸，因此尺寸不会太大，而且还切断了图像的一部分。或者看起来是这样。我只希望图像占据屏幕的一部分。如何缩小位图并显示整个图像？

如果您能提供任何帮助、想法或建议，我将不胜感激！如果我似乎犯了一个简单的错误，请向我指出。谢谢！

这是代码：

    String fileName = data.getStringExtra("file");
    image.setImageBitmap(decodeSampledBitmapFromFile(fileName, screenWidth, screenHeight / 2));

    public static Bitmap decodeSampledBitmapFromFile(String file, int reqWidth, int reqHeight){
    //first decode with inJustDecodeBounds = true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(file, options);

    //calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    //decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    System.gc();
    return BitmapFactory.decodeFile(file, options);

}


public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight){
    //raw height and width of image
    final int imageHeight = options.outHeight;
    final int imageWidth = options.outWidth;
    int inSampleSize = 1;

    if (imageHeight > reqHeight || imageWidth > reqWidth){
        if (imageWidth > imageHeight){
            inSampleSize = Math.round((float) imageHeight / (float) reqHeight);
        }else{
            inSampleSize = Math.round((float) imageWidth / (float) reqWidth);
        }//end of second if statement
    }//end of first if statement
    return inSampleSize;
}//end of calculateInSampleSize

    public void getDisplaySize(){
    Display display = getWindowManager().getDefaultDisplay();
    Point size = new Point();
    //get the screen dimensions
    try{
        display.getSize(size);
        screenWidth = size.x;
        screenHeight = size.y;
        buttonHeight = view.getHeight();
        screenLength = (int) (screenHeight / 5);
        imageWidth = (int) (screenWidth / 4);
    }catch (NoSuchMethodError e){
        //for older versions of android
        screenWidth = display.getWidth();
        screenHeight = display.getHeight();
        buttonHeight = view.getHeight();
        screenLength = (int) (screenHeight / 5);
        imageWidth = (int) (screenWidth / 4);
    }//end of try/catch block

}//end of getDisplaySize() method
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