android - Facebook Androidを使用して画像を共有する方法

Question

Facebook経由で画像とコンテンツを共有しようとしていますが、ユーザーがFacebook経由でログインしておらず、ユーザーが[共有]ボタンをクリックすると、最初にログインを要求する必要がありますが、コードを実行すると取得できませんエラーが発生しますが、画面には何も表示されず、else 部分に移動し、logcat に else 部分のメッセージが表示されます

アダプタ

 holder.sharefb.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View view) {
                    if (strtextfb == null) {


                        share();
                    }
                }
            });

メソッド

 public void RequestData(){
        GraphRequest request = GraphRequest.newMeRequest(AccessToken.getCurrentAccessToken(), new GraphRequest.GraphJSONObjectCallback() {
            @Override
            public void onCompleted(JSONObject object,GraphResponse response) {

                JSONObject json = response.getJSONObject();
                try {
                    if(json != null){
                        String text = "<b>Name :</b> "+json.getString("name")+"<br><br><b>Email :</b> "+json.getString("email")+"<br><br><b>Profile link :</b> "+json.getString("link");
                       // details_txt.setText(Html.fromHtml(text));
                       // profile.setProfileId(json.getString("id"));


                       // System.out.println("FbId" + fbids);

                    }

                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        });
        Bundle parameters = new Bundle();
        parameters.putString("fields", "id,name,link,email,picture");
        request.setParameters(parameters);
        request.executeAsync();
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        callbackManager.onActivityResult(requestCode, resultCode, data);


    }

    public void share() {
         if (AccessToken.getCurrentAccessToken() != null) {
        RequestData();
        String pictureUrl = "https://upload.wikimedia.org/wikipedia/en/9/90/Bale_as_Batman.jpg";
        Bundle params = new Bundle();
        params.putString("name", "" + "Aditya");
        params.putString("message", "" + "Nver Give Up");
        params.putString("caption", "" + "Hi");
        params.putString("description", "" + "Lie Cheat Steal");
        params.putString("link", "" + "https://www.google.co.in/");
        if (pictureUrl != "")
            params.putString("picture", "" + pictureUrl);
    /* make the API call */
        new GraphRequest(
                AccessToken.getCurrentAccessToken(),
                "/me/feed",
                params,
                HttpMethod.POST,
                new GraphRequest.Callback() {
                    public void onCompleted(GraphResponse response) {
                    /* handle the result */
                        Log.e("res", "" + response.getError());
                    }
                }
        ).executeAsync();
    }
    else
    {
        LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
                    @Override
                    public void onSuccess(LoginResult loginResult) {

                        GraphRequest request = GraphRequest.newMeRequest(loginResult.getAccessToken(), new GraphRequest.GraphJSONObjectCallback() {
                            @Override
                            public void onCompleted(JSONObject jsonObject, GraphResponse graphResponse) {

                            }
                        });

                    }

                    @Override
                    public void onCancel() {

                    }

                    @Override
                    public void onError(FacebookException e) {

                    }
                });
                System.out.println("else part");

    }
}

Answer 1

初めてログインしようとすると、アクセス トークンが null になります。それで、それは別の部分で起こっています。これを他の部分で実行してください。うまくいくと思います：

LoginManager.getInstance().registerCallback(mcallbackManager, new FacebookCallback<LoginResult>()
            {
            @Override
            public void onSuccess(LoginResult loginResult) {

                GraphRequest request = GraphRequest.newMeRequest(loginResult.getAccessToken(), new GraphRequest.GraphJSONObjectCallback() {
                    @Override
                    public void onCompleted(JSONObject jsonObject, GraphResponse graphResponse) {

}
});

}
});

Answer 2

first add 
FacebookSdk.sdkInitialize(getApplicationContext());
callbackManager = CallbackManager.Factory.create();    
permissionNeeds = Arrays.asList("publish_actions");
        manager = LoginManager.getInstance();   
**on onCreate and wirte below code in send button lick event**
 send.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {

                        if (isOnline()) {
                            new WebView(MainActivity.this);

                            manager.logInWithPublishPermissions(MainActivity.this, permissionNeeds);
                            manager.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {

                                @Override
                                public void onSuccess(LoginResult loginResult) {
                                    sharePhotoToFacebook();
                                }

                                @Override
                                public void onCancel() {
                                    System.out.println("onCancel");
                                }

                                @Override
                                public void onError(FacebookException exception) {

                                    exception.printStackTrace();
                                }
                            });


                            alertDialog.dismiss();
                        } else {
                            Toast.makeText(getBaseContext(), "Please check internet connection", Toast.LENGTH_SHORT).show();
                        }

                    }
                });


     private void sharePhotoToFacebook() {
            try {
                Log.i("Facebook Image", camera_pathname + "");
                Bitmap image = BitmapFactory.decodeFile(camera_pathname);
                //Bitmap image = decodeFile(camera_pathname);
                image = getResizedBitmap(image);
                //Bitmap image = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);

                SharePhoto photo = new SharePhoto.Builder()
                        .setBitmap(image)
                        .setCaption(et_hashtag.getText().toString())
                        .build();

                SharePhotoContent content = new SharePhotoContent.Builder()
                        .addPhoto(photo)
                        .build();

                ShareApi.share(content, null);
                Toast.makeText(getBaseContext(), "Shared successfully", Toast.LENGTH_SHORT).show();
            } catch (Exception e) {
                e.printStackTrace();
            }

            // manager.logOut();
        }