问题

如何通过点击导航抽屉菜单项来打开新的活动？

Share_Home.java

public class Share_Home extends AppCompatActivity {

    private long backPressedTime;
    private ActionBarDrawerToggle toggle;
    private DrawerLayout drawer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_share_home);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        drawer = findViewById(R.id.drawer_layout);
        NavigationView navigationView = findViewById(R.id.nav_view);
        
        SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(this, getSupportFragmentManager());
        ViewPager viewPager = findViewById(R.id.view_pager);
        viewPager.setAdapter(sectionsPagerAdapter);
        TabLayout tabs = findViewById(R.id.tabs);
        tabs.setupWithViewPager(viewPager);
        tabs.setTabMode(TabLayout.MODE_SCROLLABLE);
        tabs.getTabAt(1).select();
        
        toggle = new ActionBarDrawerToggle(this, drawer, R.string.open, R.string.close);
        drawer.addDrawerListener(toggle);
        toggle.syncState();
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        if (toggle.onOptionsItemSelected(item)){
            return  true;
        }
        return super.onOptionsItemSelected(item);
    }
}

activity_share_home.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"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <include
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <com.google.android.material.navigation.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/nav_menu_item" />

    <include
        layout="@layout/activity_tabs_menu"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</androidx.drawerlayout.widget.DrawerLayout>

nav_menu_item.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/nav_Setting"
        android:icon="@drawable/setting_icon"
        android:title="@string/nav_Setting" />
    <item
        android:id="@+id/nav_Help"
        android:icon="@drawable/help_icon"
        android:title="@string/nav_Help" />
    <item
        android:id="@+id/nav_Ratings"
        android:icon="@drawable/rating_icon"
        android:title="@string/nav_Ratings" />
    <item
        android:id="@+id/nav_About"
        android:icon="@drawable/about_icon"
        android:title="@string/nav_About" />
</menu>

public class Share_Home extends AppCompatActivity {
private long backPressedTime;
private ActionBarDrawerToggle toggle;
private DrawerLayout drawer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_share_home);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
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.
SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(this, getSupportFragmentManager());
ViewPager viewPager = findViewById(R.id.view_pager);
viewPager.setAdapter(sectionsPagerAdapter);
TabLayout tabs = findViewById(R.id.tabs);
tabs.setupWithViewPager(viewPager);
tabs.setTabMode(TabLayout.MODE_SCROLLABLE);
tabs.getTabAt(1).select();
toggle = new ActionBarDrawerToggle(this, drawer, R.string.open, R.string.close);
drawer.addDrawerListener(toggle);
toggle.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
if (toggle.onOptionsItemSelected(item)){
return  true;
}
return super.onOptionsItemSelected(item);
}
}

<?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"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<include
layout="@layout/app_bar_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<com.google.android.material.navigation.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_main"
app:menu="@menu/nav_menu_item" />
<include
layout="@layout/activity_tabs_menu"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.drawerlayout.widget.DrawerLayout>

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/nav_Setting"
android:icon="@drawable/setting_icon"
android:title="@string/nav_Setting" />
<item
android:id="@+id/nav_Help"
android:icon="@drawable/help_icon"
android:title="@string/nav_Help" />
<item
android:id="@+id/nav_Ratings"
android:icon="@drawable/rating_icon"
android:title="@string/nav_Ratings" />
<item
android:id="@+id/nav_About"
android:icon="@drawable/about_icon"
android:title="@string/nav_About" />
</menu>

答案1

得分: 3

给你的 NavigationView 设置一个 NavigationItemSelectedListener：

navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
         int id = menuItem.getItemId();    
         if (id == R.id.xxx){
              Intent newIntent = new Intent(this, NewActivity.class);
              startActivity(newIntent);  
          }
          return true;
     }
});

同时修改你的布局。

从：

<androidx.drawerlayout.widget.DrawerLayout>

    <include layout="@layout/app_bar_main" />
    <com.google.android.material.navigation.NavigationView/>
    <include layout="@layout/activity_tabs_menu"/>

</androidx.drawerlayout.widget.DrawerLayout>

改为：

<androidx.drawerlayout.widget.DrawerLayout>

    <include layout="@layout/app_bar_main" />
    <com.google.android.material.navigation.NavigationView/>

</androidx.drawerlayout.widget.DrawerLayout>

将 <include layout="@layout/activity_tabs_menu"/> 移动到 app_bar_main 布局中。

navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
int id=menuItem.getItemId();    
if (id == R.id.xxx){
Intent newIntent = new Intent(this, NewActivity.class);
startActivity(newIntent);  
}
return true;
}
});

<androidx.drawerlayout.widget.DrawerLayout >
<include layout="@layout/app_bar_main" />
<com.google.android.material.navigation.NavigationView/>
<include layout="@layout/activity_tabs_menu"/>
</androidx.drawerlayout.widget.DrawerLayout>

<androidx.drawerlayout.widget.DrawerLayout >
<include layout="@layout/app_bar_main" />
<com.google.android.material.navigation.NavigationView/>
</androidx.drawerlayout.widget.DrawerLayout>

答案2

得分: 0

在你的NavigationView中获取一个监听器，用于监听所选项目。因此，您可以设置监听器，然后在导航抽屉中按下特定项目时启动一个活动，就像这样：

navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
switch (menuItem.getItemId()) {
case R.id.menu_item_1:
Intent intent = new Intent(this, ItemActivity.class);
startActivity(intent);
break;
}
}
});

<details>
<summary>英文:</summary>
You get a listener in your NavigationView that listens to the item pressed. So you can set the listener and then start an activity when a particular item is pressed in the NavigationDrawer, like so:

navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
switch (menuItem.getItemId()) {
case R.id.menu_item_1:
Intent intent = new Intent(this, ItemActivity.class);
startActivity(intent);
break;
}
}
});

</details>
# 答案3
**得分**: 0
以下是翻译好的部分：
```java
@Override
public boolean onOptionsItemSelected(MenuItem item) {
final int itemId = item.getItemId();
if (itemId == R.id.nav_Setting) {
Intent newIntent = new Intent(getApplicationContext(), YourSettingActivity.class);
newIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(newIntent);
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.nav_menu_item, menu);
return super.onCreateOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
final int itemId = item.getItemId();
if (itemId == R.id.nav_Setting) {
Intent newIntent = new Intent(getApplicationContext(), YourSettingActivity.class);
newIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(newIntent);
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.nav_menu_item, menu);
return super.onCreateOptionsMenu(menu);
}

答案4

得分: 0

你必须重写 onNavigationItemSelected 方法并检查所选菜单项的 id，然后打开相应的 Activity：

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
    switch (item.getItemId()) {
        case R.id.activity1:
            startActivity(new Intent(this, Activity1.class));
            break;
        case R.id.activity2:
            startActivity(new Intent(this, Activity2.class));
            break;
    }
    drawer.closeDrawer(GravityCompat.START);
    return true;
}

同时，记得在菜单布局中的每个项目中添加 id：

<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/activity1"
        android:title="@string/activity1" />

    <item
        android:id="@+id/activity2"
        android:title="@string/activity2" />

</menu>

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.activity1:
startActivity(new Intent(this, Activity1.class));
break;
case R.id.activity2:
startActivity(new Intent(this, Activity2.class));
break;
}
drawer.closeDrawer(GravityCompat.START);
return true;
}

<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/activity1"
android:title="@string/activity1" />
<item
android:id="@+id/activity2"
android:title="@string/activity2" />
</menu>