java - 位图在android中总是返回null

Question

我一直在尝试制作一个小画廊，但位图总是返回 null。代码是这样的:

    public View getView(int position, View convertView, ViewGroup parent) {

        ImageView i = new ImageView(mContext);
        //Toast.makeText(getApplicationContext(),imgArray2.length+ " Image path from gallery : " + imgArray2[position], Toast.LENGTH_SHORT).show();
        //Bitmap bitmap = BitmapFactory.decodeFile(imgArray2[position]);
        //Uri uri = Uri.parse(imgArray2[position]);
        //Bitmap bitmap = decodeFile(new File(uri.toString()).getAbsoluteFile());
        //Bitmap bitmap = BitmapFactory.decodeFile(uri.toString());
        //int imgID = getResources().getIdentifier(path, "drawable", "mypack.pack");
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inSampleSize = 15;
        Bitmap bitmap = BitmapFactory.decodeFile(imgArray2[position], options);
        //i.setImageResource(imgArray2[position]);
        i.setImageBitmap(bitmap);
        //Uri uri = Uri.parse(imgArray2[position]);
        Toast.makeText(getApplicationContext(), "Image path from gallery : " + imgArray2[position], Toast.LENGTH_SHORT).show();
        //i.setImageURI(Uri.parse(imgArray2[position]));
        i.setLayoutParams(new Gallery.LayoutParams(170, 170));
        i.setScaleType(ImageView.ScaleType.FIT_XY);
        i.setBackgroundResource(mGalleryItemBackground);
        return i; 
   }

正如您从注释掉的代码中看到的，我一直在尝试很多选项。 setImageURI 有效，但我需要缩小图像，因为我有很多图像。图片在sd卡里。我检查了图像的路径，它是正确的。这里做错了什么？

Answer 1

你分析过日志吗？有时，当图像太大而无法解码时，Dalvik VM 会拒绝内存请求，导致返回空图像。