【发布时间】：2022-01-25 16:02:35
【问题描述】：
我想从我的应用程序导航抽屉中创建一个注销警报对话框。导航抽屉中的所有其他项目都是片段，我希望这个项目只显示一个警报对话框
我之前在 MainActivity 中有一个按钮，它使用点击监听器和 firebase.getInstance.signOut() 将用户带回登录活动：
点击监听器上的上一个按钮
//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();
}
});*/
经过一些重新设计后，我创建了一个使用片段的导航抽屉，我希望当用户选择注销时会提示一个警告对话框，询问他们是否确定，然后让按钮按照我之前的操作并发送用户返回登录活动。
我不认为需要创建另一个片段来注销，但如果我错了，请纠正我。
Mainactivity.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();
} }
MainFragment.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>
任何帮助将不胜感激，在导航抽屉中最好地利用片段时遇到了麻烦
【问题讨论】：
-
这段代码中到底有什么不符合您的预期？告诉我们共享代码有什么问题。你有什么错误吗？
-
请澄清您的具体问题或提供其他详细信息以准确突出您的需求。正如目前所写的那样，很难准确地说出你在问什么。
标签： firebase android-studio android-fragments navigation-drawer logout