android - 在 android studio 中使用共享首选项存储 Google 登录详细信息

Question

我已经在我的应用程序中实现了 Google 登录。我正在尝试使用共享首选项保存用户登录详细信息，但出现以下错误:

1) java.lang.RuntimeException: 将结果 ResultInfo{who=null, request=0, result=-1, data=Intent { (has extras) }} 传递给 Activity 失败

2) java.lang.NullPointerException:尝试在空对象引用上调用虚方法'java.lang.String java.lang.String.toString()'

社交登录.java

package com.studypal.khadija.studypal;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.login.LoginManager;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;
import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.GoogleApiClient;
import java.util.Arrays;

public class SocialLogin extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener, View.OnClickListener {
private static final String TAG = SocialLogin.class.getSimpleName();
private GoogleApiClient mGoogleApiClient;
private SignInButton mSignInButton;
private static final int RC_SIGN_IN = 0;
private CallbackManager mCallbackManager;
private LoginButton mFbLoginButton;
private LoginManager mLoginManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_social_login);

    // [START configure_signin]
    // Configure sign-in to request the user's ID, email address, and basic profile. ID and basic profile are included in DEFAULT_SIGN_IN.
    GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
            .requestEmail()
            .build();
    // [END configure_signin]

    //[START build_client]
    // Build a GoogleApiClient with access to the Google Sign-In API and the options specified by gso.
    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .enableAutoManage(this, this)
            .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
            .build();
    // [END build_client]

    // [START customize_button]
    // Customize sign-in button. The sign-in button can be displayed in
    // multiple sizes and color schemes. It can also be contextually
    // rendered based on the requested scopes. For example. a red button may
    // be displayed when Google+ scopes are requested, but a white button
    // may be displayed when only basic profile is requested.
    mSignInButton = (SignInButton) findViewById(R.id.sign_in_button);
    mSignInButton.setSize(SignInButton.SIZE_STANDARD);
    mSignInButton.setScopes(gso.getScopeArray());
    mSignInButton.setOnClickListener(this);  //Register button's OnClickListener to sign in the user when clicked
    // [END customize_button]

    //Facebook Login
    mFbLoginButton = (LoginButton) findViewById(R.id.login_button);
    mLoginManager = LoginManager.getInstance();
    mCallbackManager  = CallbackManager.Factory.create();
    mFbLoginButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            mLoginManager.logInWithReadPermissions(SocialLogin.this, Arrays.asList("public_profile", "email"));
            mLoginManager.registerCallback(mCallbackManager,
                    new FacebookCallback<LoginResult>() {
                        @Override
                        public void onSuccess(LoginResult loginResult) {
                            Toast.makeText(SocialLogin.this, "Fb Login Success", Toast.LENGTH_SHORT).show();
                            redirectToHome();
                        }

                        @Override
                        public void onCancel() {
                            Toast.makeText(SocialLogin.this, "Fb Login Cancel", Toast.LENGTH_SHORT).show();
                        }

                        @Override
                        public void onError(FacebookException exception) {
                            Toast.makeText(SocialLogin.this, "Fb Login Error", Toast.LENGTH_SHORT).show();

                        }
                    });
        }
    });
}

// [START onActivityResult]
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
    if (requestCode == RC_SIGN_IN) {
        GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
        handleSignInResult(result);
    }

    mCallbackManager.onActivityResult(requestCode, resultCode, data);
}
// [END onActivityResult]

/**
 * Handle Sign In Result
 * @param result
 */

// [START handleSignInResult]
private void handleSignInResult(GoogleSignInResult result) {
    Log.d(TAG, "handleSignInResult:" + result.isSuccess());
    if (result.isSuccess()) {
        // Signed in successfully, show authenticated UI.
        GoogleSignInAccount acct = result.getSignInAccount();

        String personName = acct.getDisplayName();
        String personEmail = acct.getEmail();
        String personId = acct.getId();
 /*     Uri personPhoto = acct.getPhotoUrl();
        String idToken = acct.getIdToken();
        mIdTokenTextView.setText("ID Token: " + idToken);
        */
        SharedPreferences sharedPref = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor =sharedPref.edit();
        editor.putString("username",personName.toString());
        editor.putString("email", personEmail.toString());
        editor.putString("id",personId.toString());
        editor.apply();


        Toast.makeText(this, personName+""+personEmail, Toast.LENGTH_SHORT).show();
        Toast.makeText(this, "Sign In", Toast.LENGTH_SHORT).show();
        redirectToHome();
    } else {
        // Signed out, show unauthenticated UI.
        Toast.makeText(this, "Sign Out", Toast.LENGTH_SHORT).show();
        //mIdTokenTextView.setText("ID Token: null");
    }
}
// [END handleSignInResult]

//[START signIn]
private void signIn() {
    //Starting the intent prompts the user to select a Google account to sign in with.
    Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
    startActivityForResult(signInIntent, RC_SIGN_IN);
}
//[END signIn]

@Override
protected void onResume() {
    super.onResume();
}
@Override
protected void onPause() {
    super.onPause();
}

//Handle sign-in button taps by creating a sign-in intent with the getSignInIntent method,
//and starting the intent with startActivityForResult.
@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.sign_in_button:
            signIn();
            break;
    }
}


@Override
public void onConnectionFailed(ConnectionResult connectionResult) {

}

/**
 *
 */
private void redirectToHome() {
    startActivity(new Intent(SocialLogin.this, NavBaseActivity.class));
    finish();
}
}

有人可以帮我写代码吗

Answer 1

首先检查 personName、personEmail 和 personId 值是否不为空，因为有时 google api 不提供任何值(意味着它返回空值)。

然后应用 personName.toString 方法更改为字符串。(顺便说一句，Google 已经返回了字符串中的所有值，那么为什么要将所有值更改为字符串)。

这是一次性登录的代码(直到用户不注销)---

首先创建一个 SharedPref 类，例如...

public class SharedPrefApp {

SharedPreferences sharepreferences;

 public static SharedPrefApp instance = null;

public static SharedPrefApp getInstance()
{

if (instance == null) {
       synchronized (SharedPrefApp.class) {
           instance = new SharedPrefApp();
       }
   }
   return instance;
  }
public void saveISLogged_IN(Context context, Boolean isLoggedin) {
    sharepreferences = PreferenceManager
            .getDefaultSharedPreferences(context);
    SharedPreferences.Editor editor = sharepreferences.edit();
    editor.putBoolean("IS_LOGIN", isLoggedin);
    editor.commit();
}

public boolean getISLogged_IN(Context context) {
    sharepreferences = PreferenceManager
            .getDefaultSharedPreferences(context);
    return sharepreferences.getBoolean("IS_LOGIN", false);
}

}

登录成功后在登录类中添加这个---

 SharedPrefApp sharedPref;
 sharedPref = SharedPrefApp.getInstance();

  sharedPref.saveISLogged_IN(this, true);//add this on user sucessful login

现在检查用户是否已经在应用程序的初始页面或第一页上登录，例如 -----

SharedPrefApp sharedPref;
 sharedPref = SharedPrefApp.getInstance();

////

if (sharedPref.getISLogged_IN(SplashActivity.this)) {
               Intent NextScreen = new Intent(getApplicationContext(),
                        LandingActivity.class);
                startActivity(NextScreen);
                finish();
            }
            else{
                intent = new Intent(SplashActivity.this, LoginActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivity(intent);
                finish();

            }

还有一点不要忘记在用户注销时更改此值----

sharedPref.saveISLogged_IN(LandingActivity.this, false);

希望这对你有帮助...