问题描述
我的code完美的作品。我通过导航抽屉选择每一个项目，该列表项检查
My code works perfectly: every item I select via Navigation Drawer, the list item is checked.
当然，我想先从默认的片段（家）的应用程序，但抽屉式导航栏也没有选择的项目。如何选择编程该项目？
Of course I want start app with a default fragment (home), but Navigation Drawer has not the item selected. How can I select programmatically that item?
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;
[...]
我觉得我需要在这里编辑：
I think that I need to edit here:
if (menuItem.isChecked()) menuItem.setChecked(false);
else menuItem.setChecked(true);
或者在的onCreate 在应用程序启动时FragmentTransaction。
Or in onCreate at App startup with FragmentTransaction.
感谢您的支持
推荐答案
使用code如下：
navigationView.getMenu().getItem(0).setChecked(true);
调用此方法之后您调用 setNavDrawer（）;
在的getItem（INT指数）方法获取菜单项，那么你可以调用 setChecked（真）; 上菜单项，你剩下要做的就是找出哪些元素索引确实默认有，并更换0与索引。
The getItem(int index) method gets the MenuItem then you can call the setChecked(true); on that MenuItem, all you are left to do is to find out which element index does the default have, and replace the 0 with that index.
这篇关于导航抽屉：如何设定在启动时选定的项目？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！