Question

在我的应用中，我有一个gridview，它会显示外部存储器中存在的图像。但是有些图像不可见，我在日志中遇到异常

12-08 10:27:02.465 24444-24444/com.example.thiru.gallery D/directory: Camera
12-08 10:27:02.644 24444-24444/com.example.thiru.gallery D/path: /storage/emulated/0/DCIM/Camera/IMG_20171208_073319324_HDR.jpg
12-08 10:27:02.647 24444-24444/com.example.thiru.gallery D/directory: Camera
12-08 10:27:02.818 24444-24444/com.example.thiru.gallery D/path: /storage/emulated/0/DCIM/Camera/IMG_20171208_073319324_HDR.jpg
12-08 10:27:02.819 24444-24444/com.example.thiru.gallery D/directory: 0
12-08 10:27:02.820 24444-24444/com.example.thiru.gallery E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /storage/emulated/0/Ringtones: open failed: EISDIR (Is a directory)
12-08 10:27:02.820 24444-24444/com.example.thiru.gallery E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /storage/emulated/0/Ringtones: open failed: EISDIR (Is a directory)

但它不会停止或崩溃app。相反，它在该项目的位置没有显示任何内容。我从内存中获取图像，

ArrayList<String> imagepath = getAllShownImagesPath(this);
myImageAdapter = new ImageAdapter(this,imagepath);
gridview.setAdapter(myImageAdapter);

我的适配器代码是，

@Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;
        if (convertView == null) {  // if it's not recycled, initialize some attributes
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(width/2-10, width/2-10));
            imageView.setScaleType(ImageView.ScaleType.FIT_XY);
            imageView.setCropToPadding(false);
        } else {
            imageView = (ImageView) convertView;
        }
        Bitmap bm = decodeSampledBitmapFromUri(itemList.get(position), width, width);
        BitmapDrawable ob = new BitmapDrawable(mContext.getResources(), bm);
        imageView.setBackground(ob);
        return imageView;
    }


   public Bitmap decodeSampledBitmapFromUri(String path, int reqWidth, int reqHeight) {

        Bitmap bm = null;
        // First decode with inJustDecodeBounds=true to check dimensions
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);
        // Calculate inSampleSize
        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
        // Decode bitmap with inSampleSize set
        options.inJustDecodeBounds = false;
        bm = BitmapFactory.decodeFile(path, options);
        return bm;
    }
    public int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
        // Raw height and width of image
        final int height = options.outHeight;
        final int width =  options.outWidth;
        int inSampleSize = 1;
        if (height > reqHeight || width > reqWidth) {
            if (width > height) {
                inSampleSize = Math.round((float)height / (float)reqHeight);
            } else {
                inSampleSize = Math.round((float)width / (float)reqWidth);
            }
        }
        return inSampleSize;
    }

我需要知道在解码路径时是否存在异常，以便从我的列表中删除该图像路径。

如何在android中检测File Not Found Exception

0 个答案: