Androidx导航视图-`setNavigationItemSelectedListener`不起作用 [英] Androidx Navigation View - `setNavigationItemSelectedListener` Doesn't Work
问题描述
我在做什么?
我一直在尝试使用Androidx导航抽屉(<com.google.android.material.navigation.NavigationView>).我已经阅读了文档此处，其中说，为了处理项目选择，我们可以使用setNavigationItemSelectedListener.
I have been trying to work with Androidx Navigation Drawer(<com.google.android.material.navigation.NavigationView>). I've read the documentation Here, which says that for handling item selections we can use setNavigationItemSelectedListener.
注意:我也正在使用JetPack的导航组件.
Note: I am using JetPack's Navigation Component as well.
以下是: main_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="@color/colorPrimary"
android:theme="@style/ThemeOverlay.AppCompat.Dark" />
<fragment
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="@navigation/nav_graph" />
</LinearLayout>
<com.google.android.material.navigation.NavigationView
android:id="@+id/navigationView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:menu="@menu/drawer_menu" />
</androidx.drawerlayout.widget.DrawerLayout>
这里是: MainActivity.java
import android.os.Bundle;
import android.view.MenuItem;
import android.widget.Toast;
import com.google.android.material.navigation.NavigationView;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.NavigationUI;
public class MainActivity extends AppCompatActivity {
public Toolbar toolbar;
public DrawerLayout drawerLayout;
public NavController navController;
public NavigationView navigationView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setupNavigation();
}
// Setting Up One Time Navigation
private void setupNavigation() {
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
drawerLayout = findViewById(R.id.drawer_layout);
navigationView = findViewById(R.id.navigationView);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
Toast.makeText(MainActivity.this, "Hello", Toast.LENGTH_SHORT).show();
return false;
}
});
navController = Navigation.findNavController(this, R.id.nav_host_fragment);
NavigationUI.setupActionBarWithNavController(this, navController, drawerLayout);
NavigationUI.setupWithNavController(navigationView, navController);
}
@Override
public boolean onSupportNavigateUp() {
return NavigationUI.navigateUp(drawerLayout, Navigation.findNavController(this, R.id.nav_host_fragment));
}
@Override
public void onBackPressed() {
if (drawerLayout.isDrawerOpen(GravityCompat.START)) {
drawerLayout.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
}
情况:
一切正常，我在运行时得到了Drawer，也得到了Hamburger，可以很好地显示带有菜单项的NavigationView.
Everything displays fine, I get the Drawer at runtime, I also get the Hamburger, It works fine to display the NavigationView with the menu items.
以下是: drawer_menu.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:checkableBehavior="single">
<item
android:id="@+id/first"
android:icon="@mipmap/ic_launcher"
android:title="First" />
<item
android:id="@+id/second"
android:icon="@mipmap/ic_launcher"
android:title="Second" />
<item
android:id="@+id/third"
android:icon="@mipmap/ic_launcher"
android:title="Third" />
</group>
</menu>
问题:
在点击菜单项时，它不响应我的单击事件，也就是onNavigationItemSelected.如您所见，我的MainActivity.java并不显示Toast，开关内的任何菜单ID都不起作用.
On tapping the menu items, it does not respond to my click events, a.k.a onNavigationItemSelected. As you can see my MainActivity.java, the Toast does not appear neither any of the menu ids work inside switch.
我一直在尝试许多示例和不同的方法来完成此操作.
I've been trying many examples and different ways to get this done.
有什么方法可以使菜单项响应我的选择事件?
Is there any way to make menu items respond to my select events?
如果您需要更多详细信息，请在下面做评论.
If you need any more details on this, please do comment below.
非常感谢您的帮助.
推荐答案
我想通了.
以防万一有人需要，我将其发布在这里.
Just in case if someone needs it, I'm posting it here.
代替此:
navigationView = findViewById(R.id.navigationView);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
Toast.makeText(MainActivity.this, "Hello", Toast.LENGTH_SHORT).show();
return false;
}
});
navController = Navigation.findNavController(this, R.id.nav_host_fragment);
NavigationUI.setupActionBarWithNavController(this, navController, drawerLayout);
NavigationUI.setupWithNavController(navigationView, navController);
我更改为:
navigationView = findViewById(R.id.navigationView);
navController = Navigation.findNavController(this, R.id.nav_host_fragment);
NavigationUI.setupActionBarWithNavController(this, navController, drawerLayout);
NavigationUI.setupWithNavController(navigationView, navController);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
Toast.makeText(MainActivity.this, "Hello", Toast.LENGTH_SHORT).show();
return false;
}
});
它奏效了，可能是我们在连接onNavigationSelector之前需要配置所有内容.
And it worked, may be we need to configure everything before attaching the onNavigationSelector.
这篇关于Androidx导航视图-`setNavigationItemSelectedListener`不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
