如何从其片段之一在导航活动的导航抽屉中写入用户名？

Question

主页ctivity.java（航海活动）

   import android.app.Fragment;
   import android.app.FragmentManager;
   mport android.app.FragmentTransaction;
   import android.content.Intent;
   import android.os.Bundle;
   import android.support.design.widget.NavigationView;
   import android.support.v4.view.GravityCompat;
   import android.support.v4.widget.DrawerLayout;
   import android.support.v7.app.ActionBarDrawerToggle;
   import android.support.v7.app.AppCompatActivity;
   import android.support.v7.widget.Toolbar;
   import android.view.Menu;
   import android.view.MenuItem;
   import android.view.View;
   import android.widget.TextView;

   import com.example.dellpc.reuz_app.DTO.User;
   import com.example.dellpc.reuz_app.Fragments.BrowseAdFragment;
   import com.example.dellpc.reuz_app.Fragments.LoginFragment;
   import com.example.dellpc.reuz_app.Fragments.NetworkErrorFragment;
   import com.example.dellpc.reuz_app.Fragments.TopMainFragment;
   import com.example.dellpc.reuz_app.R;
   import com.example.dellpc.reuz_app.utils.CheckNetworkConnection;
   import com.example.dellpc.reuz_app.utils.NetworkErrorFragmentSetter;

   public class HomeActivity extends AppCompatActivity
   implements NavigationView.OnNavigationItemSelectedListener {
   private Fragment fragment;
   private String title;
   private DrawerLayout drawer;
   private NavigationView navigationView;
   private View layout;
   private User user=null;
       @Override

     protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_home);
     Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    getSupportActionBar().setHomeButtonEnabled(true);
    getSupportActionBar().setTitle("REUZ");
    drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open,                          R.string.navigation_drawer_close);
    drawer.setDrawerListener(toggle);
    toggle.syncState();

    navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);
    navigationView.bringToFront();
    System.out.println(getSupportActionBar().getHeight());
    View headerLayout = navigationView.getHeaderView(0);
    layout=headerLayout.findViewById(R.id.navigationHeader);
    getSupportActionBar().setTitle("REUZ");

    this.setInitialFragment();
    this.listeners();

    /*this.getUserObject();*/
}
   public void listeners(){
   layout.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
     if(CheckNetworkConnection.isConnectionAvailable(HomeActivity.this))
        {
            getLoginFragment();
        }
        else{
         fragment=                         NetworkErrorFragmentSetter.getNetworkErrorFragment(HomeActivity.this);
         replaceFragment();

     }
    }
});

       getFragmentManager().addOnBackStackChangedListener(new                FragmentManager.OnBackStackChangedListener() {
    @Override
    public void onBackStackChanged() {
        Fragment currentFragment =  getFragmentManager().findFragmentById(R.id.content_frame);
        if (currentFragment instanceof TopMainFragment) {
           getSupportActionBar().setTitle("REUZ");
        }
        else if (currentFragment instanceof BrowseAdFragment) {
            getSupportActionBar().setTitle("All Categories");
        }
        else if (currentFragment instanceof LoginFragment) {
            getSupportActionBar().setTitle("LOGIN");
        }
        else if(currentFragment instanceof NetworkErrorFragment){
            getSupportActionBar().setTitle("NETWORK ERROR");
        }

               }
});
   }
@Override
    public void onBackPressed() {
     //drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else {
        super.onBackPressed();
    }
}
       @Override
       public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.home, menu);
    return true;
}
       @Override
       public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}
       @SuppressWarnings("StatementWithEmptyBody")
       @Override
       public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.

    int id = item.getItemId();

    if (id == R.id.nav_home) {
        // Handle the home action
        setInitialFragment();


    } else if (id == R.id.nav_browse) {
                fragment=new BrowseAdFragment();

    } else if (id == R.id.nav_submitAd) {
                Intent intent=new  Intent(getApplicationContext(),SubmitAdActivity.class);
                startActivity(intent);
    } else if (id == R.id.nav_help) {

    } else if (id == R.id.nav_my_ads) {

    } else if (id == R.id.nav_wishList) {

    }
        replaceFragment();
     //drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    //drawer.closeDrawer(GravityCompat.START);
    return true;
}

public void setTitleOnActionBar(String title) {


    getSupportActionBar().setTitle(title);
}


public void setInitialFragment(){
    fragment=new TopMainFragment();
    FragmentTransaction ft=getFragmentManager().beginTransaction();
    ft.replace(R.id.content_frame, fragment);
   // ft.addToBackStack(null);
    ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
    ft.commit();

    drawer.closeDrawer(GravityCompat.START);
}
public void getLoginFragment(){
    fragment=new LoginFragment();
    FragmentTransaction ft=getFragmentManager().beginTransaction();
    ft.replace(R.id.content_frame, fragment);
    ft.addToBackStack(null);
    ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
    ft.commit();

    drawer.closeDrawer(GravityCompat.START);

}
public void replaceFragment(){
    FragmentTransaction ft=getFragmentManager().beginTransaction();
    ft.replace(R.id.content_frame, fragment);
    ft.addToBackStack(null);
    ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
    ft.commit();

    drawer.closeDrawer(GravityCompat.START);
}
@Override
public void onResume() {
    super.onResume();
    // Set the title

}
public void getUserObject(User user){
    this.user=user;

    if(user!=null){
        changeLayoutName();
    }
}
public void changeLayoutName(){
   TextView name= (TextView)layout.findViewById(R.id.textView8);
    name.setText(user.getName());
}
}

登录碎片。java（片段）

         import android.app.Fragment;
        import android.content.Intent;
        import android.os.Bundle;
        import android.support.design.widget.NavigationView;
        import android.support.v7.widget.Toolbar;
        import android.text.Editable;
        import android.text.TextWatcher;
        import android.view.LayoutInflater;
        import android.view.View;
        import android.view.ViewGroup;
        import android.widget.Button;
        import android.widget.EditText;
        import android.widget.TextView;
        import android.widget.Toast;

        import com.example.dellpc.reuz_app.Activities.HomeActivity;
        import com.example.dellpc.reuz_app.Activities.RegisterActivity;
        import com.example.dellpc.reuz_app.Activities.UnableToLoginActivity;
        import com.example.dellpc.reuz_app.DTO.User;
        import com.example.dellpc.reuz_app.R;
        import com.example.dellpc.reuz_app.Validator.IValidation;
        import com.example.dellpc.reuz_app.Validator.Validation;
        import com.example.dellpc.reuz_app.dao.IUserDAO;
        import com.example.dellpc.reuz_app.dao.UserDAO;


        public class LoginFragment extends Fragment {

    private EditText emailET, passwordET;
    private Button loginBTN;
    private TextView utlTV, registerTV, invalidEmailTV, invalidPasswordTV;
    private View view;
    private NavigationView navigationView;
    private User user;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // keep the fragment and all its data across screen rotation
        setRetainInstance(true);
    }



    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        view = inflater.inflate(R.layout.fragment_login, container, false);
        Toolbar toolbar = (Toolbar)view.findViewById(R.id.toolbar);

        ((HomeActivity)getActivity()).getSupportActionBar().setTitle("LOGIN");
        this.mapping();
        this.listeners(view);
        return view;
    }


    public void mapping(){
        emailET = (EditText)view.findViewById(R.id.emailET);
        passwordET = (EditText)view.findViewById(R.id.passwordET);
        loginBTN = (Button)view.findViewById(R.id.loginBTN);
        utlTV = (TextView)view.findViewById(R.id.utlTV);
        invalidEmailTV = (TextView)view.findViewById(R.id.invalidEmailTV);
        invalidPasswordTV = (TextView)view.findViewById(R.id.invalidPasswordTV);
        registerTV = (TextView)view.findViewById(R.id.registerTV);
    }

    public void listeners(View view){
        loginBTN.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String email = emailET.getText().toString();
                String password = passwordET.getText().toString();
                validateAndMoveToActivity(email, password);

            }
        });

        utlTV.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent utlIntent = new Intent(getActivity(), UnableToLoginActivity.class);
                startActivity(utlIntent);
            }
        });

        registerTV.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent registerIntent = new Intent(getActivity(), RegisterActivity.class);
                startActivity(registerIntent);
            }
        });

        emailET.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }

            @Override
            public void afterTextChanged(Editable s) {
                invalidEmailTV.setText("");
                invalidPasswordTV.setText("");
            }
        });

        passwordET.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }

            @Override
            public void afterTextChanged(Editable s)
            {
                invalidEmailTV.setText("");
                invalidPasswordTV.setText("");
            }
        });
    }

    public void validateAndMoveToActivity(String email, String password){
        IValidation iValidation = new Validation();
        if(!iValidation.isFilled(email) && iValidation.isFilled(password)){
            invalidEmailTV.setText("This field is required");
        }
        else if(iValidation.isFilled(email) && !iValidation.isFilled(password)) {
            invalidPasswordTV.setText("This field is required");
        }
        else if(!iValidation.isFilled(email) && !iValidation.isFilled(password)){
            invalidEmailTV.setText("This field is required");
            invalidPasswordTV.setText("This field is required");
        }
        else
        {
            IUserDAO iUserDAO = new UserDAO(getActivity().getApplicationContext());

          /*
                if(iUserDAO.isEmailPasswordExist(email, password))*/
            if(iUserDAO.isEmailExist(email)){
            user=iUserDAO.isEmailPasswordExist(email,password);
            if(user!=null)
            {
                    Toast.makeText(view.getContext(), "Successful Login", Toast.LENGTH_SHORT).show();
                HomeActivity home=new HomeActivity();
                    home.getUserObject(user);
                   /* Intent homeACIntent = new Intent(view.getContext(), HomeActivity.class);
                    homeACIntent.putExtra("user",user);
                    startActivity(homeACIntent);*/
                    // Remove this fragment.
                    getActivity().getFragmentManager().popBackStack();
                }
                else {
                    invalidPasswordTV.setText("Invalid email or password");
                }
            }
            else {
                // After successful login where do you want to move your activity.
                invalidEmailTV.setText("Invalid phone number or email");
            }
        }
    }
@Override
public void onSaveInstanceState(Bundle state) {
    super.onSaveInstanceState(state);
    state.putSerializable("user",user);
}


}

HomeActivity包含两个片段-Login和Top最初它显示Top fragment Login fragment在成功注册后有一个注册选项用户被导航到登录片段现在登录后控件必须到达“Top”并且用户的名称必须写在导航抽屉中怎么做？

这是我的抽屉。我不想写用户名而不是欢迎来到Reuz

首页活动

Answer 1

我看到您正在将用户详细信息保存在本地数据库中，然后在用户成功登录后尝试加载数据。您面临的问题是没有更新文本视图。一种可能的解决方案是，您可以从TopMainFragment本身的onViewCreated（）方法调用changeLayoutName（）方法。