如何从 Facebook 获取图像并在图像视图中显示

Question

loginBtn.setUserInfoChangedCallback(new UserInfoChangedCallback() {
            @Override
            public void onUserInfoFetched(GraphUser user) {
                if (user != null) {
                    userName.setText("Hello, " + user.getName());

                    Bitmap bitmap1 = getFacebookProfilePicture(user.getId());

                    imgview.setImageBitmap(bitmap1);
                } else {
                    userName.setText("You are not logged");
                }
            }
        });
public Bitmap getFacebookProfilePicture(String userID) {

        try {
            URL imageURL = new URL("https://graph.facebook.com/" + userID
                    + "/picture?type=large");
            bitmap = BitmapFactory.decodeStream(imageURL.openConnection()
                    .getInputStream());

        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return bitmap;

    }

这是我的代码，我正在尝试从 Facebook 获取个人资料图片并将其显示在我的应用程序的图像视图上，我可以从 Facebook 获取名称，但是当我输入获取个人资料图片的代码时，我无法获取图片在android中请告诉我哪里做错了给我解决方案如何设置这个代码。

Answer 1

使用此方法从Url获​​取Bitmap。

 /**
     * Download image from server url and return bitmap
     *
     * @param stringUrl Imaage download url
     * @return Bitmap receieved from server
     */
    private Bitmap downloadImage(String stringUrl) {
        URL url;
        Bitmap bm = null;
        try {
            url = new URL(stringUrl);
            URLConnection ucon = url.openConnection();
            InputStream is;
            if (ucon instanceof HttpURLConnection) {
                HttpURLConnection httpConn = (HttpURLConnection) ucon;
                int statusCode = httpConn.getResponseCode();
                if (statusCode == 200) {
                    is = httpConn.getInputStream();
                    BitmapFactory.Options options = new BitmapFactory.Options();
                    options.inSampleSize = 8;
                    BufferedInputStream bis = new BufferedInputStream(is, 8192);
                    ByteArrayBuffer baf = new ByteArrayBuffer(1024);
                    int current = 0;
                    while ((current = bis.read()) != -1) {
                        baf.append((byte) current);
                    }
                    byte[] rawImage = baf.toByteArray();
                    bm = BitmapFactory.decodeByteArray(rawImage, 0, rawImage.length);
                    bis.close();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bm;
    }

像这样将 Facebook 个人资料图片 url 传递给此方法，并将下载的位图设置为 imageview。

 URL imageURL = new URL("https://graph.facebook.com/" + userID
                    + "/picture?type=large");

 imgview.setImageBitmap(downloadImage(imageURL));

希望对你有帮助！

Answer 2

使用回调，它们更容易。 如下创建回调；

private FacebookCallback<LoginResult> callback = 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) {
                if(jsonObject != null){
                    try {
                        String name = jsonObject.getString("name");
                        String email = jsonObject.getString("email");
                        String id = jsonObject.getString("id");

                        saveCurrentProfileInfo(id, name, email);
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            }
        });

        Bundle parameters = new Bundle();
        parameters.putString("fields", "id, email, name");
        request.setParameters(parameters);
        request.executeAsync();
    }

    @Override
    public void onCancel() {
        createSnackBar("Facebook login cancelled");
    }

    @Override
    public void onError(FacebookException e) {
        createSnackBar("Error logging in to Facebook");
    }
};

然后在你的 oncreate 方法上，初始化一个 CallbackManager

CallbackManager callbackManager = CallbackManager.Factory.create();

loginButton.registerCallback(callbackManager, callback);

然后，您可以像以前一样使用检索到的 id 来获取个人资料图片。

Answer 3

假设您获得了正确的访问令牌，更新后的 API 在 JSON 中显示图片字段，如下所示：

{
"id": "8169595750129122",
"name": "A user name",
"picture": {
    "data": {
        "is_silhouette": false,
        "url": "https://fbcdn-profile-a.akamaihd.net/hprofile-ak-xtp1/v/t1.0-1/p50x50/11150668_881451758563505_2749775492727269008_n.jpg?oh=35239d96bf3a6d34bd455c51218412d9&oe=56487861&__gda__=1446869670_cd2511b71fc9b8809d6b52bdbb451ff0"
    }
  }
}

如果你想在登录后例如获取图片的url

LoginButton login_button = (LoginButton) view.findViewById(R.id.login_button);


    callbackManager = CallbackManager.Factory.create();
    login_button.setFragment(this);
    LoginManager.getInstance().registerCallback(callbackManager,
            new FacebookCallback<LoginResult>() {
                @Override
                public void onSuccess(LoginResult loginResult) {

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



 //THIS CONTAINS the URL String displaying it is up to you
String PROFPIC_URL = object.getJSONObject("picture").getJSONObject("data").getString("url");
String FIRSTNAME = object.getString("first_name");


                                    } catch (Exception e) {
                                        e.printStackTrace();
                                    }
                                }
                            });
                    Bundle parameters = new Bundle();
                    parameters.putString("fields", "id,name,picture,last_name,first_name");
                    request.setParameters(parameters);
                    request.executeAsync();
                }

                @Override
                public void onCancel() {
                    textview.setText("Facebook Login Cancelled");
                }

                @Override
                public void onError(FacebookException exception) {
                    textview.setText("Facebook Login Error");
                }
            });

你可以在这里https://developers.facebook.com/tools/explorer/做价值观实验