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java - 如何从 Android 的内置导航抽屉中打开 Activity

问题描述

我见过很多人遇到同样的问题，但是当我尝试他们的解决方案时，它仍然无法从导航抽屉中打开活动。

我的 MainActivity 的代码

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {

//region Properties
private AppBarConfiguration mAppBarConfiguration;
ImageButton settings_btn;
//endregion

@Override
protected void onStart() {
    super.onStart();
    ProductDatabase productDb = new ProductDatabase();
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    settings_btn = findViewById(R.id.btn_settings);
    settings_btn.setOnClickListener(v ->
            startActivity(new Intent(MainActivity.this, SettingsActivity.class)));

    FloatingActionButton fab = findViewById(R.id.fab);
    fab.setOnClickListener(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);
    // 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_login, R.id.nav_treatments, R.id.nav_product, R.id.nav_about, R.id.nav_contactUs)
            .setDrawerLayout(drawer)
            .build();
    NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
    NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
    NavigationUI.setupWithNavController(navigationView, navController);
}

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

@Override
public void onBackPressed() {
    DrawerLayout drawer = findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else {
        super.onBackPressed();
    }
}

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

    if (id == R.id.nav_booking) {
        startActivity(new Intent(this, BookingActivity.class));
    } else if (id == R.id.nav_home) {

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

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

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

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

    }

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

当我运行此代码并单击“预订”选项卡时。什么都没发生。Booking 以前是一个 Fragment，但现在我只想让它打开一个 Activity，而所有其他选项都打开 Fragment。提前致谢

标签： javaandroidandroid-activitynavigation-drawer

解决方案

navigationView.setNavigationItemSelectedListener(this)

我没有在你的代码中看到这行代码。显然你没有设置监听器

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