Question

当我将文本设置为nav_header_main

中的textView时，我的应用程序崩溃

当我将文本设置为nav_header_main中的文本视图时，我的应用程序崩溃了，而我无法将文本设置为textView

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        NavigationView navigationView = findViewById(R.id.nav_view);

        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.addDrawerListener(toggle);
        toggle.syncState();
        navigationView.setNavigationItemSelectedListener(this);
        db = new SQLiteHandler(getApplicationContext());

        // session manager
        session = new SessionManager(getApplicationContext());

        if (!session.isLoggedIn()) {
             logoutStudent();
        }
        // Fetching Student details from SQLite
        HashMap<String, String> student = db.getStudentDetails();

        String name = student.get("name");
       // String section = student.get("section");
        TextView  s_name = (TextView) findViewById(R.id.student_name);

        s_name.setText("please work!");

这是布局

<TextView
    android:id="@+id/student_name"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingTop="@dimen/nav_header_vertical_spacing"
    android:text="@string/app_name"
    android:textAppearance="@style/TextAppearance.AppCompat.Body1"
    android:textColor="@color/bg_register" />
I expect the output to set the text, but the app is crashing.

Answer 1

NavigationView navView = findViewById(R.id.nav_view);
View headerView = navView.getHeaderView(0);
TextView hname= headerView.findViewById(R.id.headername);
 hname.setText("Your Navigation Text here!");

无法将文本设置为文本视图

1 个答案: