问题
I am trying to implement recycler view instead of an expandable list view,so that when I click a navigation drawer menu item,t should expand.Her is my code,I don't how to implement. activity_main.xml:
<include
layout="@layout/app_bar_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<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:headerLayout="@layout/nav_header_main"
app:menu="@menu/activity_main_drawer"
app:itemTextAppearance="@style/NavDrawerTextStyle"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/recycleView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#fff">
</android.support.v7.widget.RecyclerView>
and this is Adapter
public class ExpandableListCustomAdapter extendsRecyclerView.Adapter{
private List<SubMenuItems> subMenuItemses_list=new ArrayList<>();
public static class MyViewHolder extends RecyclerView.ViewHolder {
public TextView sample_text;
public MyViewHolder(View itemView) {
super(itemView);
sample_text=(TextView)itemView.findViewById(R.id.sample_text);
}
}
public ExpandableListCustomAdapter(List<SubMenuItems> subMenuItemses_list){
this.subMenuItemses_list=subMenuItemses_list;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.expandable_list_custom_adapter,parent,false);
return new MyViewHolder(view);
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
SubMenuItems subMenuItems=subMenuItemses_list.get(position);
holder.sample_text.setText(subMenuItems.getItem1());
}
@Override
public int getItemCount() {
return subMenuItemses_list.size();
}
}
MainActivity.java
ExpandableListCustomAdapter expandableListCustomAdapter=new ExpandableListCustomAdapter(subMenuItemses2);
layoutManager=new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(layoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
prepareSubMenu();
//here we configured text,images and added to a list
recyclerView.setAdapter(expandableListCustomAdapter);
private void prepareSubMenu(){
SubMenuItems subMenuItems4=new SubMenuItems("Main");
subMenuItemses2.add(subMenuItems4);
subMenuItems4=new SubMenuItems("Starters");
subMenuItemses2.add(subMenuItems4);
subMenuItems4=new SubMenuItems("Dessert");
subMenuItemses2.add(subMenuItems4);
expandableListCustomAdapter.notifyDataSetChanged();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.home_id) {
/*Toast.makeText(MainActivity.this, "Wait on....", Toast.LENGTH_SHORT).show();
startActivity(new Intent(MediaStore.ACTION_IMAGE_CAPTURE));*/
// Handle the camera action
} else if (id == R.id.menu_id) {
} else if (id == R.id.my_order_id) {
} else if (id == R.id.about_id) {
} else if (id == R.id.contact_id) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer != null) {
drawer.closeDrawer(GravityCompat.START);
}
return true;
}
}
Result is showing,that's not an issue.I need to implement this when someone click an item in Nav Drawer,and shows an expand list.Here I am using RecyclerView.Is it possible or I have to use ExpandableList ?
回答1:
If you want to add Expandable list in your drawer try to follow expandable-navigation-drawer
public class MainActivity extends ActionBarActivity {
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mDrawerToggle;
private String mActivityTitle;
private ExpandableListView mExpandableListView;
private ExpandableListAdapter mExpandableListAdapter;
private List<String> mExpandableListTitle;
private Map<String, List<String>> mExpandableListData;
private TextView mSelectedItemView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mActivityTitle = getTitle().toString();
mExpandableListView = (ExpandableListView) findViewById(R.id.navList);
mSelectedItemView = (TextView) findViewById(R.id.selected_item);
LayoutInflater inflater = getLayoutInflater();
View listHeaderView = inflater.inflate(R.layout.nav_header, null, false);
mExpandableListView.addHeaderView(listHeaderView);
mExpandableListData = ExpandableListDataSource.getData(this);
mExpandableListTitle = new ArrayList(mExpandableListData.keySet());
addDrawerItems();
setupDrawer();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
}
private void addDrawerItems() {
mExpandableListAdapter = new CustomExpandableListAdapter(this, mExpandableListTitle, mExpandableListData);
mExpandableListView.setAdapter(mExpandableListAdapter);
mExpandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
getSupportActionBar().setTitle(mExpandableListTitle.get(groupPosition).toString());
mSelectedItemView.setText(mExpandableListTitle.get(groupPosition).toString());
}
});
mExpandableListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
getSupportActionBar().setTitle(R.string.film_genres);
mSelectedItemView.setText(R.string.selected_item);
}
});
mExpandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
String selectedItem = ((List) (mExpandableListData.get(mExpandableListTitle.get(groupPosition))))
.get(childPosition).toString();
getSupportActionBar().setTitle(selectedItem);
mSelectedItemView.setText(mExpandableListTitle.get(groupPosition).toString() + " -> " + selectedItem);
mDrawerLayout.closeDrawer(GravityCompat.START);
return false;
}
});
}
private void setupDrawer() {
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.drawer_open, R.string.drawer_close) {
/** Called when a drawer has settled in a completely open state. */
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
getSupportActionBar().setTitle(R.string.film_genres);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
/** Called when a drawer has settled in a completely closed state. */
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
getSupportActionBar().setTitle(mActivityTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
mDrawerToggle.setDrawerIndicatorEnabled(true);
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
// Activate the navigation drawer toggle
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
来源：https://stackoverflow.com/questions/37566970/recyclerview-expandable-with-navigation-drawer-item