I have a problem in my e-commerce apps

Question

public class Prevalent {
public static Users currentOnlineUser;
//unique key for all users

public static final String UserPhoneKey = "UserPhone";
public static final String UserPasswordKey = "UserPassword";

}

public class Users {
//get the name passeword, all the user information
private String name, phone, password;

public Users(){

};
public Users(String name, String phone, String password) {
    this.name = name;
    this.phone= phone;
    this.password = password;
}



public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getPhone() {
    return phone;
}

public void setPhone(String phone) {
    this.phone = phone;

} public String getPassword() {
    return password;
}

public void setPassword(String password) {
    this.password = password;
}

}

public class HomeActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {

private AppBarConfiguration mAppBarConfiguration;


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

    Paper.init(this);
    Toolbar toolbar = findViewById(R.id.toolbar);
    toolbar.setTitle("Home");
    setSupportActionBar(toolbar);

    FloatingActionButton fab = findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });

    DrawerLayout drawer = findViewById(R.id.drawer_layout);


    NavigationView navigationView = findViewById(R.id.nav_view);

    View headerView = navigationView.getHeaderView(0);
    TextView userNameTextView = headerView.findViewById(R.id.user_profile_name);
    CircleImageView profileImageView = headerView.findViewById(R.id.user_profile_image);

    userNameTextView.setText(Prevalent.currentOnlineUser.getName());



    // Passing each menu ID as a set of Ids because each
    // menu should be considered as top level destinations.
    mAppBarConfiguration = new AppBarConfiguration.Builder(
            R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow)
            .setOpenableLayout(drawer)
            .build();
    NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_home);
    NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
    NavigationUI.setupWithNavController(navigationView, navController);
}


@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 onSupportNavigateUp() {
    NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_home);
    return NavigationUI.navigateUp(navController, mAppBarConfiguration)
            || super.onSupportNavigateUp();
}

@Override
public boolean onOptionsItemSelected(MenuItem item){
    int id = item.getItemId();




    return super.onOptionsItemSelected(item);
}

@SuppressWarnings("StatementWithEmptyBody")

@Override
public boolean onNavigationItemSelected(MenuItem item) {
    int id = item.getItemId();
    if (id == R.id.nav_cart) {

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

    } else if (id == R.id.nav_categories) {
    } else if (id == R.id.nav_settings) {
    } else if (id == R.id.nav_logout) {
        Paper.book().destroy();

        Intent intent = new Intent(HomeActivity.this,MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
        startActivity(intent);
        finish();
    }

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

}

I would like to get the name object but the exception told me than i can't call it because it's null can any one help me to find a solution thank you

Accepted Answer

Hello,

Welcome to our Microsoft Q&A platform!
From the code you provided, I did not find this Users instance, the Users has to be instantiated.

 userNameTextView.setText(Prevalent.currentOnlineUser.getName());

You could try to new the user and set a name to this user, then you could get its name, refer to the following code:

Users user= new Users();  
user.setName("name");  
Prevalent.currentOnlineUser = user;  
//get  
String _value = prevalent.currentOnlineUser.getName();

In addition, the code looks in java language, not c#. May I know if you are using Native Android or Xamarin.Android ?
Best Regards,
Wenyan Zhang

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Answer

actually the Users is a class in the model package i import it, it worked know i just uninstall and install the aplication again thenks for your reply :)

I have a problem in my e-commerce apps

1 additional answer