Question

我正在尝试在登录后保存用户详细信息（使用Facebook）。我能够获取数据但无法保存。我正在使用SharedPreferences但无法保存它。当我继续进行其他活动时，数据不会丢失，但当我单击后退按钮并重新打开此活动时，所有数据都将丢失。这是我的代码：

Profilee.java

public class Profilee extends Fragment {

    String email1, birthday1, gender1;
    ImageView imageView;
    static int itis = 1;
    TextView texty;
    LoginButton button;
    LinearLayout userinput;
    private CallbackManager callbackManager;
    private TextView textView;
    SharedPreferences pref;
    private TextView email, birthday, gende;
    private AccessTokenTracker accessTokenTracker;
    private ProfileTracker profileTracker;


    private FacebookCallback<LoginResult> callback = new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            AccessToken accessToken = loginResult.getAccessToken();
            Profile profile = Profile.getCurrentProfile();
            GraphRequest graphrequest = GraphRequest.newMeRequest(loginResult.getAccessToken(),
                    new GraphRequest.GraphJSONObjectCallback() {

                        @Override
                        public void onCompleted(JSONObject object, GraphResponse response) {
                            JSONObject jsonObject = response.getJSONObject();
                            if (jsonObject != null) {
                                try {
                                    email1 = jsonObject.getString("email");
                                    gender1 = jsonObject.getString("gender");
                                    birthday1 = jsonObject.getString("birthday");
                                } catch (JSONException e) {
                                    e.printStackTrace();
                                }
                            }
                        }
                    });
            Bundle parameters = new Bundle();
            parameters.putString("fields", "email, gender, birthday");
            graphrequest.setParameters(parameters);
            graphrequest.executeAsync();
            AppEventsLogger.activateApp(getContext());
        }

        @Override
        public void onCancel() {

        }

        @Override
        public void onError(FacebookException e) {

        }
    };

    public Profilee() {
        // Required empty public constructor
    }


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        FacebookSdk.sdkInitialize(getActivity().getApplicationContext());
        callbackManager = CallbackManager.Factory.create();
        Toast.makeText(getContext(), "Create", Toast.LENGTH_SHORT).show();
        pref = getContext().getSharedPreferences("", getContext().MODE_PRIVATE);
        pref.getString("name", "asdfgh");
        pref.getString("email", "qwerty");
        pref.getString("gender", "zxcvb");
        accessTokenTracker = new AccessTokenTracker() {
            @Override
            protected void onCurrentAccessTokenChanged(AccessToken oldToken, AccessToken newToken) {
            }
        };

        profileTracker = new ProfileTracker() {
            @Override
            protected void onCurrentProfileChanged(Profile oldProfile, Profile newProfile) {
            }
        };

        accessTokenTracker.startTracking();
        profileTracker.startTracking();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_profilee, container, false);
        button = (LoginButton) v.findViewById(R.id.login_button);
        TextView button12 = (TextView) v.findViewById(R.id.edit);
        button12.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(getContext(), PrifileEdit.class);
                i.putExtra("st", email1);
                startActivity(i);
            }
        });
        texty = (TextView) v.findViewById(R.id.emo);
        imageView = (ImageView) v.findViewById(R.id.asd);
        userinput = (LinearLayout) v.findViewById(R.id.userdetail);
        int unicode = 0x1F60E;
        String emoji = getEmijoByUnicode(unicode);
        String text = "We will never post on your wall without permission ";
        texty.setText(text + emoji);

        Toast.makeText(getContext(), "CreateView", Toast.LENGTH_SHORT).show();
        return v;
    }


    public String getEmijoByUnicode(int unicode) {
        return new String(Character.toChars(unicode));
    }


    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        LoginButton loginButton = (LoginButton) view.findViewById(R.id.login_button);
        textView = (TextView) view.findViewById(R.id.textView);
        email = (TextView) view.findViewById(R.id.emailid);
        gende = (TextView) view.findViewById(R.id.gender);
        birthday = (TextView) view.findViewById(R.id.birth);
        loginButton.setReadPermissions("email");
        loginButton.setFragment(this);
        loginButton.registerCallback(callbackManager, callback);
        Toast.makeText(getContext(), "ViewCreate", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        callbackManager.onActivityResult(requestCode, resultCode, data);
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                onResume();
            }
        }, 2000);
    }

    public void displayMessage(final Profile profile) {
        if (itis == 1) {


            if (profile != null) {
                textView.setText(profile.getName());
                email.setText(email1);
                gende.setText(gender1);
                birthday.setText(birthday1);
                button.setVisibility(View.GONE);
                texty.setVisibility(View.GONE);
                userinput.setVisibility(View.VISIBLE);

                pref = getContext().getSharedPreferences("", getContext().MODE_PRIVATE);
                SharedPreferences.Editor editor = pref.edit();
                editor.putString("name", String.valueOf(textView));
                editor.putString("email", String.valueOf(email));
                editor.putString("gender", String.valueOf(gende));
                editor.commit();
            }
        }
    }

    @Override
    public void onStart() {
        super.onStart();
        Toast.makeText(getContext(), "Start", Toast.LENGTH_SHORT).show();
    }


    @Override
    public void onStop() {
        super.onStop();
        accessTokenTracker.stopTracking();
        profileTracker.stopTracking();
    }

    @Override
    public void onResume() {
        super.onResume();
        Profile profile = Profile.getCurrentProfile();
        displayMessage(profile);
        AppEventsLogger.activateApp(getContext());
    }
}

Answer 1

您没有正确保存SharedPreferences中的数据。 getText()将检索TextView中当前显示的文本，允许您将其存储到SharedPreferences中。

editor.putString("name", String.valueOf(textView)); // wrong
editor.putString("name", textView.getText().toString()); // right

然后，您可以通过调用setText()来检索该值并将其显示在屏幕上。

String myEmail = pref.getString("email", "qwerty");
textView.setText(myEmail);

Answer 2

我认为这个问题是因为 displayMessage（）方法。

重新打开活动时， onResume（）; 方法将调用，然后 displayMessage（）。

您在 displayMessage（）中再次设置 sharedprefrecens 值，这项工作会导致您丢失此 sharedprefrecens 以前的数据。

要解决此问题，您必须在 onCreate 方法

中删除 onResume 代码

使用共享首选项登录Facebook

2 个答案: