Question

我可能会纠缠于此，但似乎看不出任何不起作用的原因。

在MenuActivity中，菜单项及其功能正常运行。注销非常完美。当我将MenuActivity扩展到ProfileActivity时，出于某种原因注销按钮无法正常工作，该应用程序崩溃并显示消息“我的应用程序已停止x关闭该应用程序”。

这里是所有课程：

MenuActivity.java：

package com.example.myapplication;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

import com.google.firebase.auth.FirebaseAuth;

public class MenuActivity extends AppCompatActivity {

    private FirebaseAuth firebaseAuth;

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

        firebaseAuth = FirebaseAuth.getInstance();
    }

    private void Logout(){
        firebaseAuth.signOut();
        finish();
        startActivity(new Intent(MenuActivity.this, MainActivity.class));
    }

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch(item.getItemId()){
            case R.id.logoutMenu:{
                Logout();
                return true;
            }
            case R.id.profileMenu:
                startActivity(new Intent(MenuActivity.this, ProfileActivity.class));
        }
        return super.onOptionsItemSelected(item);
    }

}

ProfileActivity.java

package com.example.myapplication;

import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

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.ValueEventListener;

public class ProfileActivity extends MenuActivity {

    private TextView userName, userEmail, phoneNumber;
    private Button editProfile, btnChangePassword;
    private FirebaseAuth firebaseAuth;
    private FirebaseDatabase firebaseDatabase;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_profile);
        userName = findViewById(R.id.tvName3);
        userEmail = findViewById(R.id.tvEmail3);
        phoneNumber = findViewById(R.id.tvPhone3);
        editProfile = findViewById(R.id.btnEditProfile);
        btnChangePassword = findViewById(R.id.btnChangePassword);

        firebaseAuth = FirebaseAuth.getInstance();
        firebaseDatabase = FirebaseDatabase.getInstance();

        final DatabaseReference databaseReference = firebaseDatabase.getReference(firebaseAuth.getUid());

        databaseReference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                UserProfile userProfile = dataSnapshot.getValue(UserProfile.class);
                userName.setText("Name: " + userProfile.getUserName());
                userEmail.setText("Email: " + userProfile.getUserEmail());
                phoneNumber.setText("Phone: " + userProfile.getUserPhone());
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
                Toast.makeText(ProfileActivity.this, databaseError.getCode(), Toast.LENGTH_SHORT);
            }
        });

        editProfile.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(ProfileActivity.this, UpdateProfile.class));
            }
        });
        btnChangePassword.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(ProfileActivity.this, ChangePassword.class));
            }
        });
    }
}

和menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    android:id="@+id/main_menu" >
    <item
        android:id="@+id/logoutMenu"
        android:orderInCategory="100"
        app:showAsAction="always"
        android:title="Logout">
    </item>

    <item
        android:id="@+id/profileMenu"
        android:orderInCategory="200"
        app:showAsAction="never"
        android:title="Profile">
    </item>

    <item
        android:id="@+id/refreshMenu"
        android:orderInCategory="300"
        app:showAsAction="never"
        android:title="Refresh">
    </item>
</menu>

这是logcat消息

2019-05-31 09:15:56.742 20660-20660/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.myapplication, PID: 20660
    android.content.res.Resources$NotFoundException: String resource ID #0xfffffffd
        at android.content.res.Resources.getText(Resources.java:338)
        at android.widget.Toast.makeText(Toast.java:304)
        at com.example.myapplication.ProfileActivity$1.onCancelled(ProfileActivity.java:58)
        at com.google.firebase.database.core.ValueEventRegistration.fireCancelEvent(com.google.firebase:firebase-database@@17.0.0:80)
        at com.google.firebase.database.core.view.CancelEvent.fire(com.google.firebase:firebase-database@@17.0.0:40)
        at com.google.firebase.database.core.view.EventRaiser$1.run(com.google.firebase:firebase-database@@17.0.0:55)
        at android.os.Handler.handleCallback(Handler.java:789)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:169)
        at android.app.ActivityThread.main(ActivityThread.java:6585)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

在ProfileActivity中我做错了什么事来干扰菜单？

Answer 1

  private void Logout(){
    firebaseAuth.signOut();
    startActivity(new Intent(MenuActivity.this, MainActivity.class));
}

尝试此注销功能

Answer 2

问题可能出在告诉MenuActivity按下注销时该怎么做的行中。

private void Logout(){
    firebaseAuth.signOut();
    finish();
    startActivity(new Intent(MenuActivity.this, MainActivity.class));
}

告诉我，如果我理解得很清楚，崩溃仅在您处于ProfileActivity时才会发生？因为在这里您要启动一个从MenuActivity传递到MainActivity的Intent，所以如果您在ProfileActivity中，它可能会导致问题...

Answer 3

据我说，我认为您应该添加一个检查，是否有当前用户已经登录，如果该用户未登录，则会抛出空指针异常。像这样添加支票

if(FirebaseAuth.getCurrentUser()!=null){
   //Your sign out code
      }

firebaseAuth.logout Workf用于菜单活动，但不适用于个人资料活动

3 个答案: