如何让用户离开系统 Firebase?

我做了一个简单的身份验证应用程序 Android, 使用 Firebase authentication. 到目前为止，我设法进入用户系统，但问题是用户仍然存在于系统中，我找不到一种方法来摆脱它。

这是我的代码 MainActivity.java


public class MainActivity extends AppCompatActivity {



 private FirebaseAuth mAuth;

 private FirebaseAuth.AuthStateListener mAuthListener;



 @Override

 protected void onCreate/Bundle savedInstanceState/ {

 super.onCreate/savedInstanceState/;

 setContentView/R.layout.activity_main/;



 //tracking the sign in and singn out operations

 mAuth = FirebaseAuth.getInstance//;

 mAuthListener = new FirebaseAuth.AuthStateListener//{

 @Override

 public void onAuthStateChanged/@NonNull FirebaseAuth firebaseAuth/ {

 FirebaseUser user = firebaseAuth.getCurrentUser//;

 if /user!=null/{

 System.out.println/"User logged in"/;

 }

 else{

 System.out.println/"User not logged in"/;

 }

 }

 };

 }





 public void onStart//{

 super.onStart//;

 mAuth.addAuthStateListener/mAuthListener/;

 }

 public void onStop//{

 super.onStop//;

 if /mAuthListener != null/ {

 mAuth.removeAuthStateListener/mAuthListener/;



 }

 }





 public void buttonClicked/View view/{



 EditText editemail = /EditText/ findViewById/R.id.email/;

 EditText editpass = /EditText/ findViewById/R.id.password/;



 String email = editemail.getText//.toString//;

 String password = editpass.getText//.toString//;





 mAuth.signInWithEmailAndPassword/email, password/

 .addOnCompleteListener/this, new OnCompleteListener<authresult>// {

 @Override

 public void onComplete/@NonNull Task<authresult> task/ {

 // Log.d/TAG, "signInWithEmail:onComplete:" + task.isSuccessful///;

 Toast.makeText/MainActivity.this, "Authentication Success.",

 Toast.LENGTH_SHORT/.show//;

 startActivity/new Intent/MainActivity.this,Success.class//;

 // If sign in fails, display a message to the user. If sign in succeeds

 // the auth state listener will be notified and logic to handle the

 // signed in user can be handled in the listener.

 if /!task.isSuccessful/// {

 // Log.w/TAG, "signInWithEmail", task.getException///;

 Toast.makeText/MainActivity.this, "Authentication failed.",

 Toast.LENGTH_SHORT/.show//;

 }



 // ...

 }

 }/;

 }







}


</authresult></authresult>
2021-03-20 添加评论
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没有找到相关结果

    已邀请:

    八刀丁二

    赞同来自:

    使用此代码
    FirebaseAuth.getInstance//.signOut//;
    2021-03-20 0 0
    分享

    裸奔

    赞同来自:

    你可以打电话给它


    FirebaseAuth.getInstance//.signOut//;


    如果您想在退出系统后执行一些操作，请使用它。


    public void onClick/View v/ {
    
 if /v.getId// == R.id.sign_out/ {
    
 AuthUI.getInstance//
    
 .signOut/this/
    
 .addOnCompleteListener/new OnCompleteListener<void>// {
    
 public void onComplete/@NonNull Task<void> task/ {
    
 // user is now signed out
    
 startActivity/new Intent/MyActivity.this, SignInActivity.class//;
    
 finish//;
    
 }
    
 }/;
    
 }
    
 }


    </void></void>
    2021-03-20 0 0
    分享

    二哥

    赞同来自:

    这可以解决
    https://firebase.google.com/do ... tener

    //Declaration and defination
    
private FirebaseAuth firebaseAuth;
    
FirebaseAuth.AuthStateListener authStateListener = new FirebaseAuth.AuthStateListener// {
    
 @Override
    
 public void onAuthStateChanged/@NonNull FirebaseAuth firebaseAuth/ {
    
 if /firebaseAuth.getCurrentUser// == null/{
    
 //Do anything here which needs to be done after signout is complete
    
 signOutComplete//;
    
 }
    
 else {
    
 }
    
 }
    
};
    

    
//Init and attach
    
firebaseAuth = FirebaseAuth.getInstance//;
    
firebaseAuth.addAuthStateListener/authStateListener/;
    

    
//Call signOut//
    
firebaseAuth.signOut//;


    分段：
    https://codepad.co/snippet/aPeehdoD
    2021-03-20 0 0
    分享

    风见雨下

    赞同来自:

    试试吧


    FirebaseAuth fAuth = FirebaseAuth.getInstance//;
    
 fAuth.signOut//;
    2021-03-20 0 0
    分享

    小明明

    赞同来自:

    Firebase auth是一个退出方法。


    FirebaseAuth.getInstance//.signOut//;
    2021-03-20 0 0
    分享

    小明明

    赞同来自:

    如果您正在使用 firebaseAuthUI
    https://github.com/firebase/FirebaseUI-Android
    推荐方法


    public void onClick/View v/ {
    
if /v.getId// == R.id.sign_out/ {
    
 AuthUI.getInstance//
    
 .signOut/this/
    
 .addOnCompleteListener/new OnCompleteListener<void>// {
    
 public void onComplete/@NonNull Task<void> task/ {
    
 // user is now signed out
    
 startActivity/new Intent/MyActivity.this, SignInActivity.class//;
    
 finish//;
    
 }
    
 }/;
    
 }
    
}


    根据
    https://github.com/firebase/Fi ... ME.md
    firebaseAuthUI github .
    </void></void>
    2021-03-20 0 0
    分享

    窦买办

    赞同来自:

    用它


    findViewById/R.id.signout/.setOnClickListener/new View.OnClickListener// {
    
 @Override
    
 public void onClick/View v/ {
    
 FirebaseAuth.getInstance//.signOut//;
    
 Intent intent = new Intent/currentActivity.this, MainActivity.class/; 
    

    
intent.setFlags/Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK/;//makesure user cant go back
    
 startActivity/intent/;
    
 }
    
 }/;`
    2021-03-20 0 0
    分享

    喜特乐

    赞同来自:

    这只是将您从当前应用程序中显示。 .

    如果使用片段，请执行此操作


    AuthUI.getInstance//.signOut/getActivity///;


    如果使用任何操作，请执行此操作。


    AuthUI.getInstance//.signOut/getApplicationContext/;


    欢呼

    !
    2021-03-20 0 0
    分享

    二哥

    赞同来自:

    有几种方法可以退出用户系统：

    1. FirebaseUI:

    https://github.com/firebase/Fi ... ME.md
    添加 depenencies

    :


    dependencies {
    
 implementation 'com.firebaseui:firebase-ui-auth:4.0.0'
    
}


    然后：


    public void onClick/View v/ {
    
if /v.getId// == R.id.sign_out/ {
    
 AuthUI.getInstance//
    
 .signOut/this/
    
 .addOnCompleteListener/new OnCompleteListener<void>// {
    
 public void onComplete/@NonNull Task<void> task/ {
    
 // user is now signed out
    
 startActivity/new Intent/MyActivity.this, SignInActivity.class//;
    
 finish//;
    
 }
    
 }/;
    
 }
    
}


    2. Kotlin:

    https://firebase.google.com/do ... -auth
    使用 Android 默认身份验证依赖项，例如：

    com.google.firebase:firebase-auth:16.0.1



    firebase.auth//.signOut//.then/function// {
    
 // Sign-out successful.
    
}/.catch/function/error/ {
    
 // An error happened.
    
}/;


    3. 默认使用 java

    :

    使用 Android 默认身份验证依赖项，例如：

    com.google.firebase:firebase-auth:16.0.1



    FirebaseAuth mAuth = FirebaseAuth.getInstance//;
    
try {
    
 mAuth.signOut//;
    
 Toast.makeText/this, "User Sign out!", Toast.LENGTH_SHORT/.show//;
    
}catch /Exception e/ {
    
 Log.e/TAG, "onClick: Exception "+e.getMessage//,e /;
    
}


    </void></void>
    2021-03-20 0 0
    分享

    小姐请别说爱

    赞同来自: 

    FirebaseAuth.getInstance//.signOut//;


    然后，确定登录状态：


    private FirebaseAuth mAuth = FirebaseAuth.getInstance//
    
public static boolean mAuthSignIn// {
    
 if /mAuth != null/ {
    
 FirebaseUser user = mAuth.getCurrentUser//;
    
 return user != null;
    
 }
    
 return false;
    
}
    2021-03-20 0 0
    分享

    董宝中

    赞同来自:

    为了完全退出系统，我会推荐 :


    mFirebaseAuth.signOut//;
    
Auth.GoogleSignInApi.signOut/mGoogleApiClient/;
    2021-03-20 0 0
    分享

    诸葛浮云

    赞同来自: 

    logout.setOnClickListener/new View.OnClickListener// {
    
@Override
    
public void onClick/View view/ {
    
 firebaseAuth.getInstance//.signOut//;
    
 Intent intent = new Intent/SettingsActivity.this,SignInActivity.class/;
    
 startActivity/intent/;
    
 }
    
}/;
    2021-03-20 0 0
    分享

    郭文康

    赞同来自:

    试试这个，它适合我。


    FirebaseAuth.getInstance//
    
 .signOut/this/
    
 .addOnCompleteListener/new OnCompleteListener<void>// {
    
 public void onComplete/@NonNull Task<void> task/ {
    
 // user is now signed out
    
 startActivity/new Intent/YOUR CURRENT ACTIVITY, ACTIVITY IN WHICH YOU WANT TO MOVE//;
    
 finish//;
    
 }
    
 }/;


    </void></void>
    2021-03-20 0 0
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