导航抽屉:如何在启动时设置所选项目？
导航抽屉:如何在启动时设置所选项目？
提问于 2015-07-06 01:51:01
我的代码运行得很好:每次单击导航抽屉中的项目时，该项目都会被选中。
当然，我想使用默认的片段(主页)启动应用程序，但导航抽屉中没有选中该项目。如何以编程方式选择该项？
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);或者在使用FragmentTransaction的应用程序启动时在onCreate中。
谢谢您一直鼓励我。
回答 11
Stack Overflow用户
发布于 2015-09-03 20:26:26
您还可以调用：
navigationView.setCheckedItem(id);此方法在API 23.0.0中引入
示例
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:ignore="UnusedIds">
<group
android:id="@+id/group"
android:checkableBehavior="single">
<item
android:id="@+id/menu_nav_home"
android:icon="@drawable/ic_home_black_24dp"
android:title="@string/menu_nav_home" />
</group>
</menu>注：android:checkableBehavior="single"
另请参阅this
Stack Overflow用户
发布于 2015-11-04 19:47:01
示例(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
Stack Overflow用户
发布于 2015-11-08 02:05:04
Googles“哦，太棒了”的支持库总是有问题。如果你想在不降级支持库版本的情况下检查一个项目，只需在设置选中状态之前设置checkable即可。
MenuItem item = drawer.getMenu().findItem(R.id.action_something);
item.setCheckable(true);
item.setChecked(true);如果您在菜单xml文件中设置了checkable，它也可能起作用
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原文链接：
https://stackoverflow.com/questions/31233279
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