我在我的应用中添加了导航抽屉，并在其中创建了家庭，手机，笔记本电脑<片段列表。当我运行应用程序时，启动时启动的主要活动内容。我现在需要的是当我点击导航抽屉中的项目时它会打开片段布局但是还会显示主要内容，如何在单击片段项时隐藏主要内容。
这是代码
MainActivity.java：
public class MainActivity extends AppCompatActivity implements FragmentDrawer.FragmentDrawerListener{
Application myApp;
RSSFeed feed;
ListView lv;
CustomListAdapter adapter;
private class DrawerItemClickListener implements ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
};
private ShareActionProvider shareActionProvider;
private String[] titles;
private ListView drawerList;
private DrawerLayout drawerLayout;
private ActionBarDrawerToggle drawerToggle;
private int currentPosition = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
myApp = getApplication();
// Get feed form the file
feed = (RSSFeed) getIntent().getExtras().get("feed");
// Initialize the variables:
lv = (ListView) findViewById(R.id.listView);
lv.setVerticalFadingEdgeEnabled(true);
// Set an Adapter to the ListView
adapter = new CustomListAdapter(this);
lv.setAdapter(adapter);
titles = getResources().getStringArray(R.array.titles);
drawerList = (ListView)findViewById(R.id.drawer);
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
//Populate the ListView
drawerList.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_activated_1, titles));
drawerList.setOnItemClickListener(new DrawerItemClickListener());
//Display the correct fragment.
if (savedInstanceState != null) {
currentPosition = savedInstanceState.getInt("position");
setActionBarTitle(currentPosition);
} else {
selectItem(0);
}
// Set on item click listener to the ListView
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// actions to be performed when a list item clicked
int pos = arg2;
Bundle bundle = new Bundle();
bundle.putSerializable("feed", feed);
Intent intent = new Intent(MainActivity.this,
DetailActivity.class);
intent.putExtras(bundle);
intent.putExtra("pos", pos);
startActivity(intent);
}
});
//Create the ActionBarDrawerToggle
drawerToggle = new ActionBarDrawerToggle(this, drawerLayout,
R.string.open_drawer, R.string.close_drawer) {
//Called when a drawer has settled in a completely closed state
@Override
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
invalidateOptionsMenu();
}
//Called when a drawer has settled in a completely open state.
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
invalidateOptionsMenu();
}
};
drawerLayout.setDrawerListener(drawerToggle);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportFragmentManager().addOnBackStackChangedListener(
new FragmentManager.OnBackStackChangedListener() {
public void onBackStackChanged() {
FragmentManager fragMan = getSupportFragmentManager();
Fragment fragment = fragMan.findFragmentByTag("visible_fragment");
if (fragment instanceof TopFragment) {
currentPosition = 0;
}
if (fragment instanceof MobileFragment) {
currentPosition = 1;
}
if (fragment instanceof LaptopFragment) {
currentPosition = 2;
}
if (fragment instanceof StoresFragment) {
currentPosition = 3;
}
setActionBarTitle(currentPosition);
drawerList.setItemChecked(currentPosition, true);
}
}
);
}
private void selectItem(int position) {
// update the main content by replacing fragments
currentPosition = position;
Fragment fragment;
switch(position) {
case 1:
fragment = new MobileFragment();
break;
case 2:
fragment = new LaptopFragment();
break;
case 3:
fragment = new StoresFragment();
break;
default:
fragment = new TopFragment();
}
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_frame, fragment, "visible_fragment");
ft.addToBackStack(null);
// ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
//Set the action bar title
setActionBarTitle(position);
//Close drawer
drawerLayout.closeDrawer(drawerList);
}
@Override
protected void onDestroy() {
super.onDestroy();
adapter.imageLoader.clearCache();
adapter.notifyDataSetChanged();
}
class CustomListAdapter extends BaseAdapter {
private LayoutInflater layoutInflater;
public ImageLoader imageLoader;
public CustomListAdapter(MainActivity activity) {
layoutInflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
imageLoader = new ImageLoader(activity.getApplicationContext());
}
@Override
public int getCount() {
// Set the total list item count
return feed.getItemCount();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Inflate the item layout and set the views
View listItem = convertView;
int pos = position;
if (listItem == null) {
listItem = layoutInflater.inflate(R.layout.list_item, null);
}
// Initialize the views in the layout
ImageView iv = (ImageView) listItem.findViewById(R.id.thumb);
TextView tvTitle = (TextView) listItem.findViewById(R.id.title);
TextView tvDate = (TextView) listItem.findViewById(R.id.date);
// Set the views in the layout
imageLoader.DisplayImage(feed.getItem(pos).getImage(), iv);
tvTitle.setText(feed.getItem(pos).getTitle());
tvDate.setText(feed.getItem(pos).getDate());
return listItem;
}
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// If the drawer is open, hide action items related to the content view
boolean drawerOpen = drawerLayout.isDrawerOpen(drawerList);
menu.findItem(R.id.action_share).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
drawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
drawerToggle.onConfigurationChanged(newConfig);
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("position", currentPosition);
}
private void setActionBarTitle(int position) {
String title;
if (position == 0) {
title = getResources().getString(R.string.app_name);
} else {
title = titles[position];
}
getSupportActionBar().setTitle(title);
}
@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);
MenuItem menuItem = menu.findItem(R.id.action_share);
shareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(menuItem);
setIntent("This is example text");
return super.onCreateOptionsMenu(menu);
}
private void setIntent(String text) {
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_TEXT, text);
shareActionProvider.setShareIntent(intent);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (drawerToggle.onOptionsItemSelected(item)) {
return true;
}
switch (item.getItemId()) {
case R.id.action_create_order:
//Code to run when the Create Order item is clicked
Intent intent = new Intent(this, OrderActivity.class);
startActivity(intent);
return true;
case R.id.action_settings:
//Code to run when the settings item is clicked
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
activity_main：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/drawer_layout"
android:fitsSystemWindows="true"
tools:context="com.example.ayush.gadgetguru.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:id="@+id/container_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_main" />
</LinearLayout>
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
</LinearLayout>
<ListView android:id="@+id/drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="0dp"
android:background="#ffffff"/>
</android.support.v4.widget.DrawerLayout>
TopFragment.java：
import android.os.Bundle;
import android.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class TopFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_top, container, false);
}
}
fragment_top.xml：
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- TODO: Update blank fragment layout -->
<ListView
android:id="@+id/listView"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1" >
</ListView>
</FrameLayout>