导航抽屉:如何在启动时设置所选项目?

我的代码工作得很完美:每次单击导航抽屉中的项目时，项目就会被选中。

当然，我想启动应用程序与默认片段(家)，但导航抽屉没有选择的项目。如何以编程方式选择该项目?

public class BaseApp extends AppCompatActivity {

    //Defining Variables
    protected String LOGTAG = "LOGDEBUG";
    protected Toolbar toolbar;
    protected NavigationView navigationView;
    protected DrawerLayout drawerLayout;

    private DateManager db = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.base_layout);

        navigationView = (NavigationView) findViewById(R.id.navigation_view);


        // set the home/dashboard at startup

        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.frame, new DashboardFragment());
        fragmentTransaction.commit();

        setNavDrawer();
    }

    private void setNavDrawer(){

        // Initializing Toolbar and setting it as the actionbar
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        //Initializing NavigationView

        //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

                // I THINK THAT I NEED EDIT HERE...

                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 

                    case R.id.home:

                        DashboardFragment dashboardFragment = new DashboardFragment();
                        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
                        fragmentTransaction.replace(R.id.frame, dashboardFragment,"DASHBOARD_FRAGMENT");
                        fragmentTransaction.commit();
                        return true;
[...]

我认为我需要在这里进行编辑:

if (menuItem.isChecked()) menuItem.setChecked(false);
                    else menuItem.setChecked(true);

或者在onCreate中在App启动时使用FragmentTransaction。

谢谢你的支持。

当前回答

您可以用下面的一行代码突出显示和选择项目:

navigationView.getMenu().performIdentifierAction(R.id.posts, 0);

来源:https://stackoverflow.com/a/31044917/383761

2016-04-08 18:03:27

其他回答

首先，为选定的项目创建颜色。这里https://stackoverflow.com/a/30594875/1462969很好的例子。它可以帮助你改变图标的颜色。为了改变所有选定项目的背景添加到您的价值\style.xml文件this

  <item name="selectableItemBackground">@drawable/selectable_item_background</item>

在drawable/selectable_item_background.xml中应该声明selectable_item_background

  <?xml version="1.0" encoding="utf-8"?>
    <selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@color/accent_translucent"
      android:state_pressed="true" />
    <item android:drawable="@android:color/transparent" />
   </selector>

哪里可以在style.xml中声明颜色

 <color name="accent_translucent">#80FFEB3B</color>

在这之后

   // The main navigation menu with user-specific actions
        mainNavigationMenu_ = (NavigationView) findViewById(R.id.main_drawer);
        mainNavigationMenu_.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(MenuItem menuItem) {
                mainNavigationMenu_.getMenu().findItem(itemId).setChecked(true);
                return true;
            }
        });

正如你看到的，我用了这个 .setChecked mainNavigationMenu_.getMenu () .findItem (itemId)(真正的); 设置所选项目。这里navigationView

 <android.support.design.widget.NavigationView
        android:id="@+id/main_drawer"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        app:headerLayout="@layout/header_main_navigation_menu"
        app:itemIconTint="@color/state_list"
        app:itemTextColor="@color/primary"
        app:menu="@menu/main_menu_drawer"/>

2015-10-15 12:20:09

出于某种原因，最好使用ID来查找MenuItem。

drawer.getMenu().findItem(R.id.action_something).setChecked(true);

2015-10-21 10:52:37

bottomNavigationView.setSelectedItemId(R.id.menuItem);

上面为我工作，但我已经把它放在onResume()方法。放置在 onNavigationItemSelected(@NonNull MenuItem项)导致我在活动之间来回切换时出现问题

   private BottomNavigationView bottomNavigationView;
    
     @Override
        public void onResume(){
            super.onResume();
            bottomNavigationView.setSelectedItemId(R.id.menuItem);
    
     }

2021-05-30 22:39:13

为导航抽屉的个别项目做一个选择器

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@color/darkBlue" android:state_pressed="true"/>
    <item android:drawable="@color/darkBlue" android:state_checked="true"/>
    <item android:drawable="@color/textBlue" />
</selector>

在你的NavigationView中做一些改变

<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:itemBackground="@drawable/drawer_item"
        android:background="@color/textBlue"
        app:itemIconTint="@color/white"
        app:itemTextColor="@color/white"
        app:menu="@menu/activity_main_drawer"
        />

2017-11-02 09:08:19

例子(NavigationView.OnNavigationItemSelectedListener):

private void setFirstItemNavigationView() {
        navigationView.setCheckedItem(R.id.custom_id);
        navigationView.getMenu().performIdentifierAction(R.id.custom_id, 0);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setFirstItemNavigationView();
}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    FragmentManager fragmentManager = getFragmentManager();

    switch (item.getItemId()) {
        case R.id.custom_id:
            Fragment frag = new CustomFragment();

            // update the main content by replacing fragments
            fragmentManager.beginTransaction()
                    .replace(R.id.viewholder_container, frag)
                    .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
                    .addToBackStack(null)
                    .commit();
            break;
    }

Tks

2015-11-04 11:47:00

导航抽屉:如何在启动时设置所选项目?

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