在 Facebook Android SDK 上分享照片

Question

我正在尝试使用 Android SDK 在 Facebook 上分享照片。

问题是我的Bitmap图像为空。 这是我的代码：

public void sharePhoto(View view) {
        if (Session.getInstance().getUserFace().getBestphoto() == null) {
            Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            startActivityForResult(i, RESULT_LOAD_IMAGE);
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
            Uri selectedImage = data.getData();
            String[] filePathColumn = {MediaStore.Images.Media.DATA};
            Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
            cursor.moveToFirst();
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();
            Log.d("picture path", picturePath);
            BitmapFactory.Options options = new BitmapFactory.Options();
            try {
                Bitmap image = BitmapFactory.decodeFile(picturePath, options);
                uploadPhoto(image);
            } catch (OutOfMemoryError e) {
                try {
                    options = new BitmapFactory.Options();
                    options.inSampleSize = 2;
                    Bitmap image = BitmapFactory.decodeFile(picturePath, options);
                    uploadPhoto(image);
                } catch (Exception ex) {
                    Log.e("EXCEPTION", ex.toString());
                }
            }
        }
    }

    private void uploadPhoto(Bitmap image) {
        Log.d("Image", "" + image);
        SharePhoto photo = new SharePhoto.Builder()
                .setBitmap(image)
                .build();
        SharePhotoContent content = new SharePhotoContent.Builder()
                .addPhoto(photo)
                .build();
        ShareDialog.show(MainActivity.this, content);
    }

Answer 1

您可以尝试从 InputStream 获取位图。 用这个，

BitmapFactory.decodeStream(resolver.openInputStream(uri), null, options);

其中 resolver 是您的ContentResolver ， uri由data.getData();返回data.getData();

您不需要查询数据库，除非您想检查任何 FileNotFoundException。

Answer 2

File file = new File(picturePath);
Uri imageUri = Uri.fromFile(file.getAbsoluteFile()); 
try {
    Bitmap image = BitmapFactory.decodeStream(mContext.getContentResolver().openInputStream(imageUri));
    uploadPhoto(image); 
} catch (FileNotFoundException e) {
    e.printStackTrace();
}

1. 您来自 MediaStore 的“picturePath”光标，它可能像这样/storage/emulated/0/DCIM/Camera/IMG20200513xx.jpg 。
2. 您可以尝试更改内容 URI 的路径（ file:///storage/emulated/0/DCIM/Camera/IMG20200513xx.jpg ）。
3. 使用内容提供者的getContentResolver()打开您的图像。 然后将图像解码为位图。