反复出现相同的错误

时间：2018-07-16 13:08:30

标签： java android firebase firebase-realtime-database

我几乎已经使用Firebase构建了一个具有登录功能的聊天应用程序。但是，当我从Firebase中清除/删除所有用户，从设备上卸载应用程序并重新运行该应用程序时，当它安装并打开应用程序时，它会直接登录，这意味着它将重定向到MainActivty而不是用户可以登录或注册的StartActivity。我之前也曾遇到过这个问题，并且以某种方式解决了这个问题，但是我再次改进了项目，做了其他一些课堂，现在又遇到了同样的问题。

注意：

  1. 发生这种情况（自动登录）时，它将在我的firebase数据库中的“用户”部分下自动创建一个ID。实际上，只有在用户Singup时，它才应该发生。

  2. 我在一个小时前就实现了Facebook登录按钮，但这不是问题，我敢肯定，所以请忽略与Facebook登录相关的内容，这个问题在我实现Facebook登录按钮之前就已经存在。

  3. 我告诉您我的应用程序结构流程：用户首次安装应用程序时，它必须重定向到StartActivity。如果用户已经安装了该应用程序并已经登录，但没有注销，只需关闭该应用程序然后再次打开，它就可以直接登录，这意味着它将重定向到MainActivity，而无需再次输入密码。

  4. 基本上，我的启动器活动是MainActivity，因此，如果新用户安装了该应用程序，它将从MainActivity重定向到StartActivity（用于登录/共享）。

  5. LapitChat是应用程序类。

    我要附加MainActivity.java，StartActivity.java，LapitChat.java和AndroidManifest.xml

MainActivity.java 

package com.jimmytrivedi.lapitchat;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

import com.facebook.login.LoginManager;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ServerValue;

public class MainActivity extends AppCompatActivity {

    private FirebaseAuth mAuth;
    private FirebaseUser currentUser;
    private Toolbar toolbar;
    private ViewPager viewPager;
    private SectionsPagerAdapter sectionsPagerAdapter;
    private TabLayout tabLayout;
    private DatabaseReference UserDatabaseReference;

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

        mAuth = FirebaseAuth.getInstance();
        currentUser = mAuth.getCurrentUser();

        if (currentUser == null) {
            sendTostart();
        } else {
            UserDatabaseReference = FirebaseDatabase.getInstance().getReference().child("Users").child(mAuth.getCurrentUser().getUid());
            UserDatabaseReference.child("Online").setValue("true");
        }

        viewPager = findViewById(R.id.viewPager);
        sectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

        viewPager.setAdapter(sectionsPagerAdapter);

        toolbar = findViewById(R.id.mainToolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setTitle("Home");

        tabLayout = findViewById(R.id.tabLayout);
        tabLayout.setupWithViewPager(viewPager);
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (currentUser != null) {
            UserDatabaseReference.child("Online").setValue(ServerValue.TIMESTAMP);
        }
    }

    private void sendTostart() {
        startActivity(new Intent(MainActivity.this, StartActivity.class));
        finish();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        getMenuInflater().inflate(R.menu.main_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        super.onOptionsItemSelected(item);

        if (item.getItemId() == R.id.logout) {
            FirebaseAuth.getInstance().signOut();
            LoginManager.getInstance().logOut();
            sendTostart();
        }

        if (item.getItemId() == R.id.settings) {
            startActivity(new Intent(MainActivity.this, SettingsActivity.class));
        }

        if (item.getItemId() == R.id.allUsers) {
            startActivity(new Intent(MainActivity.this, UsersActivity.class));
        }

        return true;
    }
}

StartActivity.java 

package com.jimmytrivedi.lapitchat;

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.facebook.AccessToken;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FacebookAuthProvider;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

public class StartActivity extends AppCompatActivity {

    private Button signup, exist;
    private CallbackManager mCallbackManager;
    private FirebaseAuth mAuth;


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

        mAuth = FirebaseAuth.getInstance();
        signup = findViewById(R.id.signup);
        exist = findViewById(R.id.exist);

        signup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(StartActivity.this, RegisterActivity.class));
            }
        });

        exist.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(StartActivity.this, LoginActivity.class));
            }
        });


        // Initialize Facebook Login button
        mCallbackManager = CallbackManager.Factory.create();
        LoginButton loginButton = findViewById(R.id.login_button);
        loginButton.setReadPermissions("email", "public_profile");
        loginButton.registerCallback(mCallbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                Log.d("wihddiewd", "facebook:onSuccess:" + loginResult);
                handleFacebookAccessToken(loginResult.getAccessToken());
            }

            @Override
            public void onCancel() {
                Log.d("wihddiewd", "facebook:onCancel");
            }

            @Override
            public void onError(FacebookException error) {
                Log.d("wihddiewd", "facebook:onError", error);
            }
        });


    }

    @Override
    public void onStart() {
        super.onStart();
        FirebaseUser currentUser = mAuth.getCurrentUser();
        if (currentUser != null) {
            updateUI();
        }
    }

    private void updateUI() {
        startActivity(new Intent(StartActivity.this, MainActivity.class));
    }

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

        // Pass the activity result back to the Facebook SDK
        mCallbackManager.onActivityResult(requestCode, resultCode, data);
    }

    private void handleFacebookAccessToken(AccessToken token) {
        Log.d("wihddiewd", "handleFacebookAccessToken:" + token);

        AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            Log.d("wihddiewd", "signInWithCredential:success");
                            FirebaseUser user = mAuth.getCurrentUser();
                            updateUI();
                        } else {
                            Log.w("wihddiewd", "signInWithCredential:failure", task.getException());
                            Toast.makeText(StartActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                        }

                    }
                });
    }
}

LapitChat.java 

package com.jimmytrivedi.lapitchat;

import android.app.Application;
import android.support.annotation.NonNull;

import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ServerValue;
import com.google.firebase.database.ValueEventListener;
import com.squareup.picasso.OkHttp3Downloader;
import com.squareup.picasso.Picasso;

public class LapitChat extends Application {

    private DatabaseReference UserDatabaseReference;
    private FirebaseAuth mAuth;

    @Override
    public void onCreate() {
        super.onCreate();

        FirebaseDatabase.getInstance().setPersistenceEnabled(true);

        Picasso.Builder builder = new Picasso.Builder(this);
        builder.downloader(new OkHttp3Downloader(this, Integer.MAX_VALUE));
        Picasso built = builder.build();
        built.setIndicatorsEnabled(true);
        built.setLoggingEnabled(true);
        Picasso.setSingletonInstance(built);

        mAuth = FirebaseAuth.getInstance();


        if (mAuth.getCurrentUser() != null) {
            UserDatabaseReference = FirebaseDatabase.getInstance().getReference().child("Users").child(mAuth.getCurrentUser().getUid());


            UserDatabaseReference.addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

                    if (dataSnapshot != null) {
                        UserDatabaseReference.child("Online").onDisconnect().setValue(ServerValue.TIMESTAMP);
                    }
                }

                @Override
                public void onCancelled(@NonNull DatabaseError databaseError) {

                }
            });
        }
    }
}

AndroidManifest.xml 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.jimmytrivedi.lapitchat">

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:name=".LapitChat"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <service android:name=".FirebaseMessagingService">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT" />
            </intent-filter>
        </service>

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".StartActivity" />
        <activity
            android:name=".RegisterActivity"
            android:parentActivityName=".StartActivity" />
        <activity
            android:name=".LoginActivity"
            android:parentActivityName=".StartActivity" />
        <activity
            android:name=".SettingsActivity"
            android:parentActivityName=".MainActivity" />
        <activity
            android:name=".StatusActivity"
            android:parentActivityName=".SettingsActivity" />
        <activity
            android:name="com.theartofdev.edmodo.cropper.CropImageActivity"
            android:theme="@style/Base.Theme.AppCompat" /> <!-- optional (needed if default theme has no action bar) -->

        <activity
            android:name=".UsersActivity"
            android:parentActivityName=".MainActivity" />
        <activity android:name=".ProfileActivity">
            <intent-filter>
                <action android:name="com.jimmytrivedi.lapitchat_TARGET_NOTIFICATION" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
        <activity
            android:name=".ChatActivity"
            android:parentActivityName=".MainActivity" />

        <meta-data android:name="com.facebook.sdk.ApplicationId"
            android:value="@string/facebook_app_id"/>

        <activity android:name="com.facebook.FacebookActivity"
            android:configChanges=
                "keyboard|keyboardHidden|screenLayout|screenSize|orientation"
            android:label="@string/app_name" />
        <activity
            android:name="com.facebook.CustomTabActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />
                <data android:scheme="@string/fb_login_protocol_scheme" />
            </intent-filter>
        </activity>

    </application>

</manifest>

感谢阅读并等待您的帮助。非常感谢！

1 个答案:

答案 0 :(得分：0)

之所以发生这种情况，是因为从Android 6.0（API级别23）开始，默认情况下自动备份设置为true。因此，要解决此问题，您需要在AndroidManifest.xml文件中添加以下代码行：

android:allowBackup="false"
android:fullBackupContent="false"

请参阅here更多信息。

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