问题描述
如标题所示，我希望我的应用程序即使在用户关闭后也保持登录状态；
我不知道如何实现这一目标
这是我的代码：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FacebookSdk.sdkInitialize(getApplicationContext());
callbackManager = CallbackManager.Factory.create();
setContentView(R.layout.activity_main);
prfpic = (ImageView) findViewById(R.id.profpic) ;
wel = (TextView) findViewById(R.id.WELCOME);
Info = (TextView) findViewById(R.id.info);
Info.setText("You Must Login To Use All The Features!");
loginButton = (LoginButton) findViewById(R.id.login_button);
List<String> permission=new ArrayList<String>();
permission.add("user_likes");
permission.add("user_videos") ;
permission.add("user_posts") ;
AfterSTRING = "" ;
loginButton.setReadPermissions(permission);
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
actk = loginResult.getAccessToken();
GraphRequest request = GraphRequest.newMeRequest(
actk,
new GraphRequest.GraphJSONObjectCallback() {
@Override
public void onCompleted(JSONObject object, GraphResponse response) {
// Insert your code here
try {
wel.setVisibility(View.VISIBLE);
prfpic.setVisibility(View.VISIBLE);
wel.setText("Welcome " + object.getString("name"));
Picasso.with(getApplicationContext())
.load(object.getJSONObject("picture").getJSONObject("data").getString("url")).into(prfpic);
Info.setText("Hello");
}catch(Exception e) {
}
}
});
Bundle parameters = new Bundle();
parameters.putString("fields", "name,picture.type(large){url}");
request.setParameters(parameters);
request.executeAsync();
}
@Override
public void onCancel() {
Toast.makeText(MainActivity.this, "Login Cancelled!!", Toast.LENGTH_SHORT).show();
}
@Override
public void onError(FacebookException e) {
Toast.makeText(MainActivity.this, "Error! Please Ary Again!!", Toast.LENGTH_SHORT).show();
}
});
}
现在的问题是如何添加首选项，以便用户可以保持登录状态，直到注销为止
1楼
这是我要做的代码：
我做了一个SessionManagerFacebook类：
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import com.uigtc.crazyapp.Activities.LoginActivity;
import com.uigtc.crazyapp.Activities.MainActivity;
import java.util.HashMap;
public class SessionManagerFacebook {
// Shared Preferences
SharedPreferences pref;
// Editor for Shared preferences
Editor editor;
// Context
Context _context;
// Shared pref mode
int PRIVATE_MODE = 0;
// Sharedpref file name
private static final String PREF_NAME = "AppFacebook";
// All Shared Preferences Keys
private static final String IS_LOGIN = "IsLoggedIn";
public static final String KEY_LANG = "lang";
// Email address (make variable public to access from outside)
public static final String KEY_EMAIL = "email";
// Constructor
public SessionManagerFacebook(Context context) {
this._context = context;
pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE);
editor = pref.edit();
}
/**
* Create login session
*/
public void createLoginSession(String email, String lang) {
// Storing login value as TRUE
editor.putBoolean(IS_LOGIN, true);
editor.putString(KEY_LANG, lang);
editor.putString(KEY_EMAIL, email);
// commit changes
editor.commit();
}
public void changeLang(String lang) {
editor = pref.edit();
pref.getString(KEY_LANG, lang);
editor.apply();
}
/**
* Check login method wil check user login status
* If false it will redirect user to login page
* Else won't do anything
*/
public void checkLogin() {
// Check login status
if (!this.isLoggedIn()) {
// user is not logged in redirect him to Login Activity
Intent i = new Intent(_context, LoginActivity.class);
// Closing all the Activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// Add new Flag to start new Activity
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// Staring Login Activity
_context.startActivity(i);
}
}
/**
* Get stored session data
*/
public HashMap<String, String> getUserDetails() {
HashMap<String, String> user = new HashMap<String, String>();
user.put(KEY_EMAIL, pref.getString(KEY_EMAIL, null));
user.put(KEY_LANG, pref.getString(KEY_LANG, null));
// return user
return user;
}
/**
* Clear session details
*/
public void logoutUser() {
// Clearing all data from Shared Preferences
editor.clear();
editor.commit();
// After logout redirect user to Loing Activity
Intent i = new Intent(_context, MainActivity.class);
// Closing all the Activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// Add new Flag to start new Activity
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// Staring Login Activity
_context.startActivity(i);
}
/**
* Quick check for login
**/
// Get Login State
public boolean isLoggedIn() {
return pref.getBoolean(IS_LOGIN, false);
}
}
您可以根据需要自定义它
然后在onCompleted方法上添加以下行：
if (!sessionManagerFacebook.isLoggedIn()) {
sessionManagerFacebook.createLoginSession(object.getString("email"), getResources().getConfiguration().locale.toString());
//startActivity(new Intent(getActivity(), MainActivity.class));
} else {
user = sessionManagerFacebook.getUserDetails();
startActivity(new Intent(getActivity(), MainActivity.class));
}
现在，您必须检查是否已打开应用程序（无论用户是否登录），例如：
public class SplashScreen extends AppCompatActivity {
SessionManagerFacebook sessionManagerFacebook = new SessionManagerFacebook(this);
if (sessionManagerFacebook.isLoggedIn()) {
startActivity(new Intent(SplashScreen.this, MainActivity.class));
}
}