我正在使用Material Design Navigation View..i创建菜单项，并将活动（Activity2.java）与一个项目（已加星标）链接起来...在该活动中，我扩展了其中有导航视图的Main活动，以便我可以滑动也可以从该活动导航视图。.但是当我从第二个活动滑动导航视图时，不会选中该项目，如果我按“后退”按钮并转到“主要”活动，则将显示先前检查的菜单项...如何更新其他活动中的检查项目。请帮助
MainActivity.java
public class MainActivity extends AppCompatActivity {
//Defining Variables
private Toolbar toolbar;
private NavigationView navigationView;
private DrawerLayout drawerLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initializing Toolbar and setting it as the actionbar
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//Initializing NavigationView
navigationView = (NavigationView) findViewById(R.id.navigation_view);
//Setting Navigation View Item Selected Listener to handle the item click of the navigation menu
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
// This method will trigger on item Click of navigation menu
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
//Checking if the item is in checked state or not, if not make it in checked state
if(menuItem.isChecked()) menuItem.setChecked(false);
else menuItem.setChecked(true);
//Closing drawer on item click
drawerLayout.closeDrawers();
//Check to see which item was being clicked and perform appropriate action
switch (menuItem.getItemId()){
//Replacing the main content with ContentFragment Which is our Inbox View;
case R.id.inbox:
Toast.makeText(getApplicationContext(),"Inbox Selected",Toast.LENGTH_SHORT).show();
ContentFragment fragment = new ContentFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,fragment);
fragmentTransaction.commit();
return true;
// For rest of the options we just show a toast on click
case R.id.starred:
startActivity(new Intent(MainActivity.this,Activity2.class));
drawerLayout.closeDrawers();
Toast.makeText(getApplicationContext(),"Stared Selected",Toast.LENGTH_SHORT).show();
return true;
case R.id.sent_mail:
Toast.makeText(getApplicationContext(),"Send Selected",Toast.LENGTH_SHORT).show();
return true;
case R.id.drafts:
Toast.makeText(getApplicationContext(),"Drafts Selected",Toast.LENGTH_SHORT).show();
return true;
case R.id.allmail:
Toast.makeText(getApplicationContext(),"All Mail Selected",Toast.LENGTH_SHORT).show();
return true;
case R.id.trash:
Toast.makeText(getApplicationContext(),"Trash Selected",Toast.LENGTH_SHORT).show();
return true;
case R.id.spam:
Toast.makeText(getApplicationContext(),"Spam Selected",Toast.LENGTH_SHORT).show();
return true;
default:
Toast.makeText(getApplicationContext(),"Somethings Wrong",Toast.LENGTH_SHORT).show();
return true;
}
}
});
// Initializing Drawer Layout and ActionBarToggle
drawerLayout = (DrawerLayout) findViewById(R.id.drawer);
ActionBarDrawerToggle actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.openDrawer, R.string.closeDrawer){
@Override
public void onDrawerClosed(View drawerView) {
// Code here will be triggered once the drawer closes as we dont want anything to happen so we leave this blank
super.onDrawerClosed(drawerView);
}
@Override
public void onDrawerOpened(View drawerView) {
// Code here will be triggered once the drawer open as we dont want anything to happen so we leave this blank
super.onDrawerOpened(drawerView);
}
};
//Setting the actionbarToggle to drawer layout
drawerLayout.setDrawerListener(actionBarDrawerToggle);
//calling sync state is necessay or else your hamburger icon wont show up
actionBarDrawerToggle.syncState();
}
}
Activity2.java
public class Activity2 extends MainActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FrameLayout frameLayout = (FrameLayout)findViewById(R.id.frame);
// inflate the custom activity layout
LayoutInflater layoutInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View activityView = layoutInflater.inflate(R.layout.activity_2, null,false);
// add the custom layout of this activity to frame layout.
frameLayout.addView(activityView);
}
}
activity_main.xml
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<LinearLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical"
>
<include
android:id="@+id/toolbar"
layout="@layout/tool_bar"
/>
<FrameLayout
android:id="@+id/frame"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</LinearLayout>
<android.support.design.widget.NavigationView
android:id="@+id/navigation_view"
android:layout_height="match_parent"
android:layout_width="wrap_content"
android:layout_gravity="start"
app:headerLayout="@layout/header"
app:menu="@menu/drawer"
/>
</android.support.v4.widget.DrawerLayout>
抽屉.xml（menu_drawer）
<?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/inbox"
android:checked="false"
android:icon="@drawable/ic_inbox_black"
android:title="@string/inbox_string" />
<item
android:id="@+id/starred"
android:checked="false"
android:icon="@drawable/ic_star_black"
android:title="@string/starred_string" />
<item
android:id="@+id/sent_mail"
android:checked="false"
android:icon="@drawable/ic_send_black"
android:title="@string/sent_mail_string" />
<item
android:id="@+id/drafts"
android:checked="false"
android:icon="@drawable/ic_drafts_black"
android:title="@string/draft_string" />
<item
android:id="@+id/allmail"
android:checked="false"
android:icon="@drawable/ic_email_black"
android:title="@string/all_mail_string" />
<item
android:id="@+id/trash"
android:checked="false"
android:icon="@drawable/ic_delete_black"
android:title="@string/trash_string" />
<item
android:id="@+id/spam"
android:checked="false"
android:icon="@drawable/ic_error_black"
android:title="@string/spam_string" />
</group>
</menu>
最佳答案
添加protected int变量以存储选中的菜单项的ID
从NavigationView的clickListener中，将选中的菜单项ID添加到Intent的其他功能；为此，开始您的第二个活动
在第二个活动中，从附加项中获取菜单项ID并将其设置为的类变量（请参见1）
在您的超级活动中添加onPrepareOptionsMenu
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
super.onPrepareOptionsMenu(menu);
//recreate navigationView's menu, uncheck all items and set new checked item
navigationView.getMenu().clear();
navigationView.inflateMenu(R.menu.drawer);
//setChecked(false) to all yours menu items in NavigationView
navigationView.getMenu().findItem(R.id.SOME_ID_0).setChecked(false);
navigationView.getMenu().findItem(R.id.SOME_ID_1).setChecked(false);
navigationView.getMenu().findItem(R.id.SOME_ID_2).setChecked(false);
...etc
navigationView.setCheckedItem(checkedDrawerItemId);
}
在NavigationView的clickListener中，不要忘记将被单击项的ID设置为Activities类变量并调用
supportInvalidateOptionsMenu();关于android - 导航 View 选定菜单项是否已 checkin 其他 Activity ？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/32700478/