從導航抽屜注銷

我想從我的應用程式導航抽屜創建一個注銷警報對話框。導航抽屜中的所有其他專案都是片段，我希望這個專案只顯示一個警告對話框

導航抽屜

我以前在 MainActivity 中有一個按鈕，它使用點擊偵聽器和 firebase.getInstance.signOut() 將用戶帶回登錄活動：

單擊偵聽器上的上一個按鈕

 //on click listener for logout
    /*btnLogout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            FirebaseAuth.getInstance().signOut();
            startActivity(new Intent(getApplicationContext(),LoginActivity.class));
            finish();
        }
    });*/

經過一些重新設計后，我創建了一個使用片段的導航抽屜，我希望當用戶選擇注銷時會提示一個警告對話框，詢問他們是否確定，然后讓按鈕按照我之前的方式執行并將用戶發送回登錄活動。

我不認為需要創建另一個片段來注銷，但是，如果我錯了，請糾正我。

主要活動.java

public class MainActivity extends AppCompatActivity implements NavigationView.
    OnNavigationItemSelectedListener,MainFragment.onFragmentBtnSelected{


public TextView verifyMsg;
public Button btnLogout, verifyEmailBtn;
FirebaseAuth fauth;
public DrawerLayout drawerLayout;
public ActionBarDrawerToggle actionBarDrawerToggle;
public NavigationView navigationView;
AlertDialog.Builder reset_alert;
LayoutInflater inflater;
FragmentManager fragmentManager;
FragmentTransaction fragmentTransaction;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //xml map to java
    //btnLogout = findViewById(R.id.btnLogout);
    verifyMsg = findViewById(R.id.verifyEmailMsg);
    verifyEmailBtn = findViewById(R.id.btnVerifyEmail);
    fauth = FirebaseAuth.getInstance();

    reset_alert = new AlertDialog.Builder(this);
    inflater =this.getLayoutInflater();

    //new stuff
    androidx.appcompat.widget.Toolbar toolbar = findViewById(R.id.toolbar2);
    setSupportActionBar(toolbar);

    drawerLayout = findViewById(R.id.drawer);
    navigationView = findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);

    actionBarDrawerToggle = new
            ActionBarDrawerToggle(this, drawerLayout,
            toolbar, R.string.nav_open, R.string.nav_close);

    drawerLayout.addDrawerListener(actionBarDrawerToggle);

    actionBarDrawerToggle.setDrawerIndicatorEnabled(true);
    actionBarDrawerToggle.syncState();

    //fragment manager - creates instance of a fragment
    //load default fragment
    fragmentManager = getSupportFragmentManager();
    fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.add(R.id.container_fragment,new MainFragment());
    fragmentTransaction.commit();


    //if the user email is not verified still show verify msg
    if(!fauth.getCurrentUser().isEmailVerified()){
        verifyEmailBtn.setVisibility(View.VISIBLE);
        verifyMsg.setVisibility(View.VISIBLE);
    }
    //on click listener for verify email button
    verifyEmailBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //send verification email
            fauth.getCurrentUser().sendEmailVerification()
                    .addOnSuccessListener(new OnSuccessListener<Void>() {
                @Override
                public void onSuccess(Void aVoid) {
                    Toast.makeText(MainActivity.this,"Verification Sent",Toast.LENGTH_SHORT).show();
                    verifyEmailBtn.setVisibility(View.GONE);
                    verifyMsg.setVisibility(View.GONE);
                }
            });
        }
    });

}
//able to select the items in nav drawer
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
    //auto close drawer
    drawerLayout.closeDrawer(GravityCompat.START);
    //Fragment fragment;
    int mId = item.getItemId();
    }
    if (mId == R.id.homeItem){
        //load default fragment
        fragmentManager = getSupportFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.container_fragment,new MainFragment());
        fragmentTransaction.commit();
    }
    if (mId == R.id.profileSettings){
        fragmentManager = getSupportFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.container_fragment,new ProfileFragment());
        fragmentTransaction.commit();
    }
    if (mId == R.id.logoutItem){

    }


    return true;
}

@Override
public void onBtnSelected() {
    fragmentManager = getSupportFragmentManager();
    fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.replace(R.id.container_fragment,new ProfileFragment());
    fragmentTransaction.commit();
} }

主片段.java

public class MainFragment extends Fragment {
private onFragmentBtnSelected listener;

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                         @Nullable Bundle savedInstanceState)
{
   View view = inflater.inflate(R.layout.fragment_main,container,false);
   Button clickme = view.findViewById(R.id.clickHF);
   clickme.setOnClickListener(new View.OnClickListener() {
       @Override
       public void onClick(View v) {
           listener.onBtnSelected();
       }
   });
   return view;
}
@Override
public void onAttach(@NonNull Context context){
    super.onAttach(context);
    if(context instanceof onFragmentBtnSelected ){
        listener =(onFragmentBtnSelected) context;
    }
    else {
        throw new ClassCastException(context.toString()   " must implement listiner");
    }
}
public interface onFragmentBtnSelected{
    public void onBtnSelected();
}

}

nav_menu.xml

<?xml version="1.0" encoding="utf-8"?>

<item android:title="General">
    <menu>
        <item
            android:id="@ id/homeItem"
            android:icon="@drawable/ic_baseline_home_24"
            android:title="@string/Home" />

    </menu>
</item>
<item android:title="Account Settings">
    <menu>
        <item
            android:id="@ id/profileSettings"
            android:icon="@drawable/ic_baseline_account_circle_24"
            android:title="Profile" />

    </menu>
</item>
<item android:title="App Features">
    <menu>
        <item
            android:id="@ id/logoutItem"
            android:icon="@drawable/ic_baseline_power_settings_new_24"
            android:title="@string/logout" />
    </menu>
</item></menu>

任何幫助都會得到極大的幫助，在最好地利用導航抽屜中的片段時遇到麻煩

uj5u.com熱心網友回復：

主要活動.java：

沒有警報對話框的 onNavigationItemSelected 方法

if (mId == R.id.logoutItem){
            FirebaseAuth.getInstance().signOut();
            startActivity(new Intent(getApplicationContext(),LoginActivity.class));
            finish();
 }

與警報對話框一起使用

if (mId == R.id.logoutItem){
 MaterialAlertDialogBuilder(this)
                .setTitle("Title")
                .setMessage("Message")
                .setIcon(android.R.drawable.ic_dialog_alert)
                .setPositiveButton("Ok") { _, _ ->
                    FirebaseAuth.getInstance().signOut();
                    startActivity(new 
                    Intent(getApplicationContext(),LoginActivity.class));
                    finish();
                }
                .setNegativeButton("Cancel") { _, _ ->
                    Toast.makeText(this, "clicked Cancel", Toast.LENGTH_LONG).show()
                }
                .show()
 }

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