我正在使用导航抽屉显示ExpandableListview。除了一个之外，每件事情都很完美...当抽屉没有数据网络打开时（点击抽屉图标时没有任何反应）
当网络可用时，OPEN抽屉没有明确的代码。
MainActivity.java
public class MainActivity extends Activity implements OnQueryTextListener {
public int CURRENT_THEME;
/* Google Analytics*/
Button btn_trackEvent, btn_trackCrash;
EasyTracker easyTracker = null;
GoogleAnalytics googleAnalytics;
StandardExceptionParser exceptionParser;
/* END GOOGLE ANALYTICS */
/* shared preference */
SharedPreferences sharedExpListView;
SharedPreferences.Editor editorExpList;
/* end of shared preference */
private DrawerLayout mDrawerLayout;
//private ListView expListView;
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild,emptyChildren;
List<String> list_cat_name,list_cat_id,list_setting;
private HashMap<String, ArrayList<String>> emptyChild;
private ActionBarDrawerToggle mDrawerToggle;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private TextView mStatusView;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
JSONArray cat = null;
// Hashmap for ListView
// ArrayList<HashMap<String, String>> catList;
int error_flag = 0; // 0 normal, 1 internet connvettion 2Server Error
private TextView main_error;
private TextView textView;
String FavCount = "0";
/* for push */
// Asyntask
AsyncTask<Void, Void, Void> mRegisterTask;
public static String name = "All";
public static String email = "newsfirst@gmail.com";
@Override
protected void onCreate(Bundle savedInstanceState) {
// Let's get rid of the app icon here
ActionBar actionBar = getActionBar();
actionBar.setIcon(null);
actionBar.setTitle("");
super.onCreate(savedInstanceState);
//overridePendingTransition(R.anim.slide_in, R.anim.slide_out);
//LayoutInflater inflator = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//View view = inflator.inflate(R.layout.action_bar_custom, null);
setContentView(R.layout.activity_main);
// Google Analytics
googleAnalytics = GoogleAnalytics.getInstance(this);
googleAnalytics.setDryRun(true);
googleAnalytics.getLogger().setLogLevel(LogLevel.VERBOSE);
easyTracker = EasyTracker.getInstance(MainActivity.this);
easyTracker.set(Fields.SCREEN_NAME, "MainActivity");
easyTracker.send(MapBuilder.createAppView().build());
exceptionParser = new StandardExceptionParser(MainActivity.this, null);
// End Google Analytics
/* get polling webservice*/
StrictMode.ThreadPolicy policy1 = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy1);
/* shared preference */
sharedExpListView=this.getSharedPreferences("sharedExpListView", MODE_PRIVATE);
editorExpList=sharedExpListView.edit();
// mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
navDrawerItems = new ArrayList<NavDrawerItem>();
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], "", navMenuIcons
.getResourceId(0, -1), "0"));
FavCount = String.valueOf(All_link.getFavRowCount(MainActivity.this));
// initialize Expandable listview
expListView = (ExpandableListView) findViewById(R.id.list_slidermenu);
expListView.setGroupIndicator(null);
list_cat_name = new ArrayList<String>();
list_cat_id = new ArrayList<String>();
list_setting = new ArrayList<String>();
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
emptyChild = new HashMap<String, ArrayList<String>>();
new GetCatList().execute();
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, // nav menu toggle icon
0, // nav drawer open - description for
// accessibility
0 // nav drawer close - description for
// accessibility
) {
@Override
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}
@Override
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
//Toast.makeText(MainActivity.this, "Network Error", Toast.LENGTH_SHORT).show();
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
// on first time display view for first nav item
displayView(0, "0");
}
}
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Log.e("position", "karpo "+position);
TextView txt_id = (TextView) view.findViewById(R.id.txt_id);
String catid = txt_id.getText().toString();
TextView txt_title = (TextView) view.findViewById(R.id.title);
All_link.GLOBAL_TITLE = "";
All_link.GLOBAL_TITLE = txt_title.getText().toString();
// display view for selected nav drawer item
if (!catid.isEmpty())
displayView(position, catid);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Toast.makeText(this, "Selected Item: " + item.getTitle(),
// Toast.LENGTH_SHORT).show();
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
/*
* case R.id.action_search:
*
* return true;
*/
default:
return super.onOptionsItemSelected(item);
}
}
/* *
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
// boolean drawerOpen = mDrawerLayout.isDrawerOpen(expListView);
// menu.findItem(R.id.action_search).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
/**
* Diplaying fragment view for selected nav drawer list item
* */
private void displayView(int position, String id) {
// update the main content by replacing fragments
Fragment fragment = null;
Log.e("POSITION", String.valueOf(id));
int position_id = Integer.parseInt(id);
switch (position_id) {
case 0:
// update selected item and title, then close the drawer
try{
fragment = new HomeFragment();
easyTracker.send(MapBuilder.createEvent("Menu Click", "Fragment", "HomeFragment", null).build());
}
catch(Exception e){
easyTracker.send(MapBuilder.createException(exceptionParser.getDescription(Thread.currentThread().getName(), e), false).build());
}
break;
default:
fragment = new CategoryFragment(id);
Log.e("category id","karcat "+id);
break;
}
// update selected item and title, then close the drawer
// expListView.setItemChecked(position, true);
// expListView.setSelection(position);
// //setTitle(navMenuTitles[position]);
// mDrawerLayout.closeDrawer(expListView);
if (fragment != null) {
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit();
expListView.setItemChecked(position, true);
expListView.setSelection(position);
// setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(expListView);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
@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);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
/**
* Async task class to get json by making HTTP call
* */
private class GetCatList extends AsyncTask<String, Void, Void> {
@Override
protected void onPreExecute() {
//expListView.setVisibility(8);
super.onPreExecute();
// Adding group data
listDataHeader.add("Home");
listDataHeader.add("News Category");
listDataHeader.add("My Favourites");
listDataHeader.add("Manage Notifications");
listDataHeader.add("Send Your Story");
listDataHeader.add("News on WhatsApp");
listDataHeader.add("About NewsFirst");
listDataHeader.add("Contact NewsFirst");
listDataHeader.add("Share this App");
listDataHeader.add("Rate this App");
listDataHeader.add("Settings");
listDataChild.put(listDataHeader.get(0), new ArrayList<String>()); // No child
listDataChild.put(listDataHeader.get(2), new ArrayList<String>()); // No child
listDataChild.put(listDataHeader.get(3), new ArrayList<String>()); // No child
listDataChild.put(listDataHeader.get(4), new ArrayList<String>()); // No child
listDataChild.put(listDataHeader.get(5), new ArrayList<String>()); // No child
listDataChild.put(listDataHeader.get(6), new ArrayList<String>()); // No child
listDataChild.put(listDataHeader.get(7), new ArrayList<String>()); // No child
listDataChild.put(listDataHeader.get(8), new ArrayList<String>()); // No child
listDataChild.put(listDataHeader.get(9), new ArrayList<String>()); // No child
list_setting.add("FAQs");
list_setting.add("Privacy Policy");
list_setting.add("Terms & Conditions");
listDataChild.put(listDataHeader.get(10), list_setting); // With child
}
@Override
protected Void doInBackground(String... params) {
if (NetworkCheck.isNetworkAvailable(getApplicationContext()) == true) {
//navDrawerItems = new ArrayList<NavDrawerItem>();
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(All_link.CATEGORY_URL,
ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
cat = jsonObj.getJSONArray(All_link.TAG_NEWS);
String err = jsonObj.getString(All_link.TAG_ERROR);
Log.e("------>Error", String.valueOf(err));
if (err.equals("1")) {
} else {
// looping through All Contacts
for (int i = 0; i < cat.length(); i++) {
JSONObject c = cat.getJSONObject(i);
String cat_id = c.getString(All_link.TAG_CAT_ID);
String cat_name = c
.getString(All_link.TAG_CAT_NAME);
String image_icon = c.getString("image_icon");
list_cat_name.add(cat_name);
list_cat_id.add(cat_id);
}
// saving cat_name with cat id in shared preference
for (int i = 0; i <list_cat_name.size(); i++) {
editorExpList.putString(list_cat_name.get(i), list_cat_id.get(i));
editorExpList.commit();
}
// End saving cat_name with cat id in shared preference
listDataChild.put(listDataHeader.get(1), list_cat_name); // With child
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler",
"Couldn't get any data from the url");
runOnUiThread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, "Network Error", Toast.LENGTH_SHORT).show();
}
});
}
} else {
Log.e("Network Error", "Internet Connection Error");
error_flag = 1;
// error = "Internet Connection Error";
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (error_flag == 1) {
expListView.setVisibility(8);
// main_error.setText("Internet Connection Error! Please check your network settings and try again");
// main_error.setVisibility(0);
} else {
/*
* navDrawerItems.add(new NavDrawerItem(navMenuTitles[1],
* navMenuIcons .getResourceId(0, -1),"1"));
*/
expListView.setVisibility(0);
// main_error.setText("");
// main_error.setVisibility(8);
// Recycle the typed array
navMenuIcons.recycle();
expListView
.setOnItemClickListener(new SlideMenuClickListener());
// setting the nav drawer list adapter
/*adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);*/
listAdapter=new ExpandableListAdapter(MainActivity.this, listDataHeader, listDataChild);
expListView.setAdapter(listAdapter);
expListView.setItemChecked(0, true);
expListView.setSelection(0);
}
}
}
}
答案 0 :(得分：2)
据推测，您的抽屉只包含ExpandableListView expListView。如果您检查AsyncTask的doInBackground()方法，如果没有可用的网络，您会看到error_flag设置为1。然后，在onPostExecute()方法中：
if (error_flag == 1) {
expListView.setVisibility(8);
8的值对应View.GONE，因此，基本上，如果没有网络，则没有抽屉。