如何導航到導航抽屜項目上的活動單擊

Question

這是我的主要活動，我想導航到我的導航抽屜項目單擊上的活動。 我已經檢查了實現這一點的舊方法，即使用 switch 語句和使用 onNavigationItemSelected 方法。 我知道這是一個經常被問到的問題，但是在閱讀了有關堆棧溢出的許多問題和解決方案后，我感到很困惑。 我對 Fragments 以及通過單擊導航抽屜中的項目啟動活動所需的條件感到困惑。

主活動.java

import android.os.Bundle;

import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;

import android.view.View;

import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;

import com.google.android.material.navigation.NavigationView;

import androidx.drawerlayout.widget.DrawerLayout;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import android.view.Menu;

public class MainActivity extends AppCompatActivity {

    private AppBarConfiguration mAppBarConfiguration;

    @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);
        // 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,
                R.id.nav_tools, R.id.nav_share, R.id.nav_send)
                .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 onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

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

mobile_navigation.xml

<?xml version="1.0" encoding="utf-8"?>
<navigation 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/mobile_navigation"
    app:startDestination="@+id/nav_home">

    <fragment
        android:id="@+id/nav_home"
        android:name="com.vdosol.navigationdrawer.ui.home.HomeFragment"
        android:label="@string/menu_home"
        tools:layout="@layout/fragment_home" />

    <fragment
        android:id="@+id/nav_gallery"
        android:name="com.vdosol.navigationdrawer.ui.gallery.GalleryFragment"
        android:label="@string/menu_gallery"
        tools:layout="@layout/fragment_gallery" />

    <fragment
        android:id="@+id/nav_slideshow"
        android:name="com.vdosol.navigationdrawer.ui.slideshow.SlideshowFragment"
        android:label="@string/menu_slideshow"
        tools:layout="@layout/fragment_slideshow" />

    <fragment
        android:id="@+id/nav_tools"
        android:name="com.vdosol.navigationdrawer.ui.tools.ToolsFragment"
        android:label="@string/menu_tools"
        tools:layout="@layout/fragment_tools" />

    <fragment
        android:id="@+id/nav_share"
        android:name="com.vdosol.navigationdrawer.ui.share.ShareFragment"
        android:label="@string/menu_share"
        tools:layout="@layout/fragment_share" />

    <fragment
        android:id="@+id/nav_send"
        android:name="com.vdosol.navigationdrawer.ui.send.SendFragment"
        android:label="@string/menu_send"
        tools:layout="@layout/fragment_send" />
</navigation>

Answer 1

您可以執行以下操作進行導航：

MenuItem logOutItem = navigationView.getMenu().findItem(R.id.nav_logout);
        logOutItem.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
//do your stuff
                return true;
            }
        });

您的 AppBarConfiguration 和 Nav Controller 不應包含上述 ID，即“nav_logout”（在我的情況下）：

mAppBarConfiguration = new AppBarConfiguration.Builder(
                R.id.navigation_home, R.id.navigation_dashboard, R.id.navigation_plan, R.id.navigation_history, R.id.navigation_about, R.id.navigation_feedback, R.id.navigation_notifications)
                .setDrawerLayout(drawer)
                .build();

您的菜單應該只包含在您的菜單文件中....無需將其添加到您的 AppBarConfiguration 和您的 NavController....

希望這有助於....快樂編碼

Answer 2

1. 在您的 Activity 中實現偵聽器：

    public class HomeActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener

2. Activity 的 onCreate 中的 setNavigationItemSelectedListener

    NavigationView mNavigationView = (NavigationView) findViewById(R.id.account_navigation_view); if (mNavigationView != null) { mNavigationView.setNavigationItemSelectedListener(this); }

3. 覆蓋方法

   public boolean onNavigationItemSelected(MenuItem item) { // Handle navigation view item clicks here. int id = item.getItemId(); if (id == R.id.nav_account) {//DO your stuff } ... }