android - 使用 Intent 与 Glide 库共享图像 - 图像始终为空

Question

我有一个运行良好的自定义 ListView ，现在我想共享列表中的图像和文本。我已经找到了如何从 SO 执行此操作的步骤，但是当我单击“共享”按钮时图像始终为空。

ImageView 使用 Glide 加载图像。

if (!Patterns.WEB_URL.matcher(Limage).matches()) {
viewholder.iview.setVisibility(View.GONE);
} else {
Glide.with(convertView.getContext()).load(Limage).centerCrop()
.diskCacheStrategy(DiskCacheStrategy.ALL).listener(new RequestListener<String, GlideDrawable>() {
                           @Override
                           public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {
                               return false;
                           }

                           @Override
                           public boolean onResourceReady(GlideDrawable resource, String model, Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {

                             //  viewholder.progress.setVisibility(View.GONE);
                               return false;
                           }
                       }).into(viewholder.iview);
            viewholder.iview.setVisibility(View.VISIBLE);
        }

我创建了一个共享按钮，并在 onclick 中传递了以下代码。

viewholder.share.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Uri bmpUri = getLocalBitmapUri(viewholder.iview);
                if (bmpUri != null) {
                    // Construct a ShareIntent with link to image
                    Intent shareIntent = new Intent();
                    shareIntent.setAction(Intent.ACTION_SEND);
                    shareIntent.putExtra(Intent.EXTRA_STREAM, bmpUri);
                    shareIntent.setType("image/*");
                    // Launch sharing dialog for image
                    listdisplay.startActivity(Intent.createChooser(shareIntent, "Share Image"));

                } else {
                    // ...sharing failed, handle error
                }

            }
        });

要从 Imageview 获取图像，我使用以下代码。

   private Uri getLocalBitmapUri(ImageView iview) {
        Drawable drawable = iview.getDrawable();
        Bitmap bmp = null;
        if (drawable instanceof BitmapDrawable){

            bmp = ((BitmapDrawable) iview.getDrawable()).getBitmap();

                Log.e("Shiva","Came inside drawable");
        } else {
            Log.e("Shiva","drawable is null"+drawable);
            return null;

        }

        Uri bmpUri = null;

        File file =  new File(listdisplay.getExternalFilesDir(Environment.DIRECTORY_PICTURES), "share_image_" + System.currentTimeMillis() + ".png");
        FileOutputStream out = null;
        try {
            out = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.PNG, 90, out);
            out.close();
            bmpUri = Uri.fromFile(file);
        } catch (IOException e) {
            e.printStackTrace();
        }

        // **Warning:** This will fail for API >= 24, use a FileProvider as shown below instead.

   return bmpUri;

    }

所以，现在发生的事情是在检查“drawable instanceof BitmapDrawable”是否总是返回 null 的 if 步骤中。这里有什么问题吗？ 注意:以上代码在适配器内部。

Answer 1

你可以使用这个加载图像:

 Glide.with(this)
            .load("https://cdn-images-1.medium.com/max/1200/1*hcfIq_37pabmAOnw3rhvGA.png")
            .asBitmap()
            .diskCacheStrategy(DiskCacheStrategy.SOURCE)
            .into(new SimpleTarget<Bitmap>() {
                @Override
                public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {
                    Log.d("Size ", "width :"+resource.getWidth() + " height :"+resource.getHeight());
                    imageView.setImageBitmap(resource);
                    storeImage(resource);
                }
            });

并将位图存储到外部存储，然后共享。

private void storeImage(Bitmap image) {
        File pictureFile = getOutputMediaFile();
        if (pictureFile == null) {
            Log.d(TAG,
                    "Error creating media file, check storage permissions: ");// e.getMessage());
            return;
        }
        try {
            FileOutputStream fos = new FileOutputStream(pictureFile);
            image.compress(Bitmap.CompressFormat.PNG, 90, fos);
            fos.close();
            Log.d(TAG, "img dir: " + pictureFile);
        } catch (FileNotFoundException e) {
            Log.d(TAG, "File not found: " + e.getMessage());
        } catch (IOException e) {
            Log.d(TAG, "Error accessing file: " + e.getMessage());
        }
    }


private  File getOutputMediaFile(){
    // To be safe, you should check that the SDCard is mounted
    // using Environment.getExternalStorageState() before doing this.
    File mediaStorageDir = new File(Environment.getExternalStorageDirectory()
            + "/Android/data/"
            + getApplicationContext().getPackageName()
            + "/Files");

    if (! mediaStorageDir.exists()){
        if (! mediaStorageDir.mkdirs()){
            return null;
        }
    }

    File mediaFile;
    Random generator = new Random();
    int n = 1000;
    n = generator.nextInt(n);
    String mImageName = "Image-"+ n +".jpg";

    mediaFile = new File(mediaStorageDir.getPath() + File.separator + mImageName);
    return mediaFile;
}