当我选择一个项目时，我正在尝试从导航抽屉菜单中打开一个新活动。不幸的是，当我单击项目菜单时，没有任何反应，
我从这里开始关注本教程：https://developer.android.com/training/implementing-navigation/nav-drawer#OpenClose
除了我尝试通过onNavigationItemSelected方法向抽屉菜单按钮添加功能的那一部分之外，其他所有东西都工作正常。
我也尝试过在onOptionsItemSelected（）方法上添加相同的功能，但是没有用。
这是我的HomeActivity.java代码
private DrawerLayout mDrawerLayout;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
ActionBar actionbar = getSupportActionBar();
actionbar.setDisplayHomeAsUpEnabled(true);
actionbar.setHomeAsUpIndicator(R.drawable.ic_menu);
mDrawerLayout = findViewById(R.id.drawer_layout);
spinnerCategory = (Spinner) findViewById(R.id.spinnerCategoryAffiliation);
listView = (ListView) findViewById(R.id.listViewProducts);
productList = new ArrayList<>();
categoryList = new ArrayList<>();
NavigationView navigationView = findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(
new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
// set item as selected to persist highlight
menuItem.setChecked(true);
// close drawer when item is tapped
mDrawerLayout.closeDrawers();
int id = menuItem.getItemId();
// Add code here to update the UI based on the item selected
// For example, swap UI fragments here
if (id == R.id.openCartMenu){
Intent newAct = new Intent(HomeActivity.this, ShoppingCartActivity.class);
startActivity(newAct);
} else if (id == R.id.openProductsMenu){
} else if (id == R.id.openPersonalInfoMenu){
} else if (id == R.id.openOrdersMenu){
}
return true;
}
});
mDrawerLayout.addDrawerListener(
new DrawerLayout.DrawerListener() {
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {
// Respond when the drawer's position changes
}
@Override
public void onDrawerOpened(View drawerView) {
// Respond when the drawer is opened
}
@Override
public void onDrawerClosed(View drawerView) {
// Respond when the drawer is closed
}
@Override
public void onDrawerStateChanged(int newState) {
// Respond when the drawer motion state changes
}
}
);
readCategories();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
mDrawerLayout.openDrawer(GravityCompat.START);
return true;
}
return super.onOptionsItemSelected(item);
}
这是我的activity_home.xml的代码
<?xml version="1.0" encoding="utf-8"?>
<!-- Use DrawerLayout as root container for activity -->
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<!-- Layout to contain contents of main body of screen (drawer will slide over this) -->
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!-- Container for contents of drawer - use NavigationView to make configuration easier -->
<android.support.design.widget.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:menu="@menu/drawer_view"
app:headerLayout="@layout/nav_header_drawer"/>
<RelativeLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.seeshop.app.HomeActivity">
<LinearLayout
android:id="@+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:orientation="vertical"
android:padding="16dp">
<Spinner
android:id="@+id/spinnerCategoryAffiliation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp" />
</LinearLayout>
<ListView
android:id="@+id/listViewProducts"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/linearLayout" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/openCartButton"
android:layout_width="69dp"
android:layout_height="67dp"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_gravity="end|bottom"
android:layout_marginTop="471dp"
android:layout_marginEnd="21dp"
android:src="@drawable/carticon" />
</RelativeLayout>
</android.support.v4.widget.DrawerLayout>
这是我的cabinet_view.xml的代码
<?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/openCartMenu"
android:icon="@drawable/ic_shopping_cart"
android:title="Shopping cart" />
<item
android:id="@+id/openProductsMenu"
android:icon="@drawable/ic_products"
android:title="Products" />
<item
android:id="@+id/openPersonalInfoMenu"
android:icon="@drawable/ic_personal_info"
android:title="Personal info" />
<item
android:id="@+id/openOrdersMenu"
android:icon="@drawable/ic_orders"
android:title="My orders" />
</group>
</menu>
非常感谢您的帮助。