使應用程序在退出應用程序後記住Facebook登錄會話

Question

如何使此代碼記住用戶在Android應用程序中所做的登錄。我需要的應用程序來記住一些數據的喜歡的用戶名和個人資料照片，但現在的應用程序，當我重新啓動（關閉並重新開啓），丟失數據的喜歡的用戶名和個人資料圖片應用

public class SelfTrail extends AppCompatActivity { 

private LoginButton btnLogin; 
private TextView facebookName; 
private CallbackManager callbackManager; 
private ProfilePictureView profilePictureView; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    FacebookSdk.sdkInitialize(getApplicationContext()); 

    setContentView(R.layout.activity_self_trail); 

    btnLogin = (LoginButton)findViewById(R.id.login_button); 
    facebookName = (TextView)findViewById(R.id.name); 
    profilePictureView = (ProfilePictureView)findViewById(R.id.image); 


    btnLogin.setReadPermissions(Arrays.asList("public_profile, email")); 
    callbackManager = CallbackManager.Factory.create(); 
    btnLogin.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 object, GraphResponse response) { 
          Log.v("Main", response.toString()); 
          setProfileToView(object); 
         } 
        }); 
      Bundle parameters = new Bundle(); 
      parameters.putString("fields", "id,name"); 
      request.setParameters(parameters); 
      request.executeAsync(); 
     } 

     @Override 
     public void onCancel() { 

     } 

     @Override 
     public void onError(FacebookException exception) { 

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

private void setProfileToView(JSONObject jsonObject) { 
    try { 
     facebookName.setText(jsonObject.getString("name")); 

     profilePictureView.setPresetSize(ProfilePictureView.NORMAL); 
     profilePictureView.setProfileId(jsonObject.getString("id")); 

    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 
}} 

隨時糾正代碼，謝謝

Answer 1

我建議你在本地保存個人資料圖片，並記住該圖片的位置字符串以及用戶名和密碼。這是一個簡單的存儲類我開始與存儲像用戶名名和密碼信息

public class UserLocalStore { 
    public int x = 0; 
    public static final String SP_NAME = "userDetails"; 
    SharedPreferences userLocalDatabase; 
    public int currentID; 
    public UserLocalStore(Context context){ 
     userLocalDatabase = context.getSharedPreferences(SP_NAME, 0); 

    } 
    public void storeUserData(User user){ 
     SharedPreferences.Editor spEditor = userLocalDatabase.edit(); 
     //spEditor.putString("ID", Integer.toString(x)); 
     spEditor.putString(Integer.toString(x) +" name", user.name); 
     spEditor.putString(Integer.toString(x) +" username", user.username); 
     spEditor.putString(Integer.toString(x) +" password", user.password); 
     x++; 
     spEditor.commit(); 

    } 
    public int getByUsername(String findusername){ 
     int x = 0; 

     while(x < 10){ 
      String test = userLocalDatabase.getString(Integer.toString(x)+ " username", ""); 
     if(test.equals(findusername)){ 

      String name = userLocalDatabase.getString(Integer.toString(x)+" name", ""); 
      String username = userLocalDatabase.getString(Integer.toString(x)+" username", ""); 
      String password = userLocalDatabase.getString(Integer.toString(x)+" password", ""); 
      User foundUser = new User(name,username,password); 
      return x; 
     } 
      x++; 
     } 


     return 0; 
    } 

    public ArrayList<User> getAllUsers(){ 
     int x = 0; 
     ArrayList<User> allUsers = new ArrayList<>(); 
     User tempuser = new User("","",""); 
     while(x < 10) { 
      if(userLocalDatabase.getString(Integer.toString(x) + " name", "").equals("")) { 
      return allUsers; 
      } 
      String name = userLocalDatabase.getString(Integer.toString(x) + " name", ""); 
      String username = userLocalDatabase.getString(Integer.toString(x) + " username", ""); 
      String password = userLocalDatabase.getString(Integer.toString(x) + " password", ""); 
      tempuser.name = name; 
      tempuser.username = username; 
      tempuser.password = password; 
      allUsers.add(tempuser); 
      x++; 
     } return allUsers; 

    } 

    public User getLoggedInUser(int ID){ 
     String name = userLocalDatabase.getString(Integer.toString(ID)+" name", ""); 
     String username = userLocalDatabase.getString(Integer.toString(ID)+" username", ""); 
     String password = userLocalDatabase.getString(Integer.toString(ID)+" password", ""); 

     User storedUser = new User(name,username,password); 
     return storedUser; 
    } 
    public User getStoredPreferences(){ 
     String name = userLocalDatabase.getString("name", ""); 
     String username = userLocalDatabase.getString("username", ""); 
     String password = userLocalDatabase.getString("password", ""); 

     User storedUser = new User(name,username,password); 
     return storedUser; 
    } 


    public void setUserLoggedIn(int loggedIn){ 
     currentID = loggedIn; 
     } 

    public int getUserLoggedIn() { 
     return currentID; 
    } 

    public void clearUserData(){ 
     SharedPreferences.Editor spEditor = userLocalDatabase.edit(); 
     spEditor.clear(); 
     spEditor.commit(); 


    } } 

然後你可以從另一個類調用它

User addthisuser = new User(name, username, password); 

userLocalStore.storeUserData（addthisuser）;