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私はAndroidアプリに取り組んでおり、アプリからFacebookに画像を共有したいのですが、ダイアログを表示せずに、以下のように試しましたが、うまくいきません。

コード

public void postFb(){ String path = "me/feed";
        AccessToken at = AccessToken.getCurrentAccessToken();
        Bundle parameters = new Bundle();
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        Const.bmp_post.compress(Bitmap.CompressFormat.PNG, 100, stream);
        byte[] byteArray = stream.toByteArray();
        parameters.putByteArray("picture", byteArray);
        HttpMethod method = HttpMethod.POST;
        GraphRequest.Callback cb = new GraphRequest.Callback() {

            @Override
            public void onCompleted(GraphResponse graphResponse) {
                Log.d("=======graph response=======" , graphResponse.toString());
                //check graphResponse for success or failure
                if(graphResponse.getError()==null){

                    Toast.makeText(NewPostActivity.this, "Successfully posted to Facebook", Toast.LENGTH_SHORT).show();
                }
                else{
                    Toast.makeText(NewPostActivity.this, "Facebook: There was an error, Please Try Again", Toast.LENGTH_SHORT).show();

                }
            }
        };

        GraphRequest request = new GraphRequest(at,path,parameters,method,cb);
        request.setParameters(parameters);
        request.executeAsync();
    }
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