Java 从URI获取多个图像的实际路径

我对android和编码非常陌生，我被困在这里。我有一个gridview，它显示我SD卡上的图像。但我的gridview没有显示任何内容。 我的Uri如下所示：

[content://com.android.providers.media.documents/document/image%3A252,content://com.android.providers.media.documents/document/image%3A68,content://com.android.providers.media.documents/document/image%3A67,content://com.android.providers.media.documents/document/image%3A172]

我已经尝试了很多方法将这个uri转换为实际路径，但都不管用

我尝试了此代码，但它导致我的应用程序崩溃：

 public String getRealPathFromURI (Uri contentUri) {
    String path = null;
    String[] proj = { MediaStore.MediaColumns.DATA };
    Cursor cursor = getContentResolver().query(contentUri, proj, null, null, null);
    if (cursor.moveToFirst()) {
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
        path = cursor.getString(column_index);
    }
    cursor.close();
    return path;
}

这是我打开图库的方式：

 btnGallery.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent();
            intent.setType("image/*");
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
                intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
            }
            intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(Intent.createChooser(intent,"Select Picture"), SELECT_IMAGE);
        }
    });

此onActivityResult（）方法代码：

if (requestCode == PICK_IMAGE_MULTIPLE && resultCode == RESULT_OK && null != data) {
        // Get the Image from data
        String[] filePathColumn = {MediaStore.Images.Media.DATA};
        imagesEncodedList = new ArrayList<String>();

        if (data.getData() != null) {

            Uri mImageUri = data.getData();
            // Get the cursor
            Cursor cursor = getContentResolver().query(mImageUri, filePathColumn, null, null, null);
            // Move to first row
            cursor.moveToFirst();
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            imageEncoded = cursor.getString(columnIndex);
            cursor.close();
            ArrayList<Uri> mArrayUri = new ArrayList<Uri>();

            mArrayUri.add(mImageUri);
            uriImage = mArrayUri.toString();// this string i store in sqlite
            galleryAdapter = new GalleryAdapter(getApplicationContext(), mArrayUri);
            gvGallery.setAdapter(galleryAdapter);
            gvGallery.setVerticalSpacing(gvGallery.getHorizontalSpacing());
            ViewGroup.MarginLayoutParams mlp = (ViewGroup.MarginLayoutParams) gvGallery.getLayoutParams();
            mlp.setMargins(0, gvGallery.getHorizontalSpacing(), 0, 0);


        } else {
            if (data.getClipData() != null) {
                ClipData mClipData = data.getClipData();
                ArrayList<Uri> mArrayUri = new ArrayList<Uri>();
                for (int i = 0; i < mClipData.getItemCount(); i++) {

                    ClipData.Item item = mClipData.getItemAt(i);
                    Uri uri = item.getUri();
                    mArrayUri.add(uri);
                    uriImage = mArrayUri.toString();//this string store in sqlite
                    // Get the cursor
                    Cursor cursor = getContentResolver().query(uri, filePathColumn, null, null, null);
                    // Move to first row
                    cursor.moveToFirst();

                    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                    imageEncoded = cursor.getString(columnIndex);
                    imagesEncodedList.add(imageEncoded);
                    cursor.close();
                    galleryAdapter = new GalleryAdapter(getApplicationContext(), mArrayUri);
                    gvGallery.setAdapter(galleryAdapter);
                    gvGallery.setVerticalSpacing(gvGallery.getHorizontalSpacing());
                    ViewGroup.MarginLayoutParams mlp = (ViewGroup.MarginLayoutParams) gvGallery
                            .getLayoutParams();
                    mlp.setMargins(0, gvGallery.getHorizontalSpacing(), 0, 0);

                }
                Log.v("LOG_TAG", "Selected Images" + mArrayUri.size());
            }
        }

    } else if (resultCode == this.RESULT_CANCELED) {
        Toast.makeText(this, "Cancelled", Toast.LENGTH_SHORT).show();
    }

并发送至共享优先权：

SharedPreferences settings = mCtx.getSharedPreferences("image_My_str", Context.MODE_PRIVATE);
            SharedPreferences.Editor editor = settings.edit();
            editor.putString("img_str", image_string);
            editor.commit();

在我的显示活动中，我从共享首选项中获取以下字符串：

 SharedPreferences settings = getSharedPreferences("image_My_str", Context.MODE_PRIVATE);
    String encodedImage = settings.getString("img_str", "");

在这里，我将该字符串转换为URi：

    Uri mImageUri = Uri.parse(encodedImage);

       Log.d("LOG_TAG", "Images URI  " + mImageUri);

            try {
                inputStream = getApplicationContext().getContentResolver().openInputStream(mImageUri);
                Log.d("LOG_TAG", "Images File  " + inputStream);
                bitmap = BitmapFactory.decodeStream(inputStream);
                Log.d("LOG_TAG", "Images bitmap  " + bitmap);

            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            if (bitmap != null) {
                img.setImageBitmap(bitmap);
            }else {
                Toast.makeText(EditMapsActivity.this, "image not found", Toast.LENGTH_LONG).show();
            }

我的URI看起来像：

[content://com.android.providers.media.documents/document/image%3A252,content://com.android.providers.media.documents/document/image%3A68,content://com.android.providers.media.documents/document/image%3A67,content://com.android.providers.media.documents/document/image%3A172]

---

尝试了多种方法将此uri转换为实际路径

。你不应该一开始就这样做。直接使用这些uri即可。例如，打开一个输入流。但是如何打开？我不明白。InputStream是=getContentRecolver（）。openInputStream（uri）。它提供空值。请查看截图。查看我的最新帖子。我张贴相关代码

[content://com.android.providers.media.documents/document/image%3A252,content://com.android.providers.media.documents/document/image%3A68,content://com.android.providers.media.documents/document/image%3A67,content://com.android.providers.media.documents/document/image%3A172]