我在其中一个片段中使用带有asynctask的导航抽屉。只要单击导航抽屉中的元素以启动该片段，即使在asynctask完成后，我的导航抽屉也会停止工作。我可以点击导航抽屉并将其打开，但每当我点击导航抽屉中的其他项目时，它就会关闭而不会在导航抽屉中加载与该项目相关联的片段。
主要活动代码：
package com.example.home;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import java.io.File;
import java.io.IOException;
import java.net.HttpCookie;
import java.net.URI;
import java.net.URISyntaxException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import org.apache.http.cookie.Cookie;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.example.fmapp.R;
import com.example.fmapp.StartActivity;
import com.example.fmapp.R.id;
import com.example.fmapp.R.layout;
import com.example.fmapp.R.menu;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Parcelable;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.annotation.SuppressLint;
import android.app.ActionBar;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.ContentUris;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.database.Cursor;
import android.util.Log;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.Spinner;
import android.widget.SpinnerAdapter;
@SuppressLint("NewApi")
public class Home extends Activity implements ActionBar.OnNavigationListener{
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] mDrawerTitles;
static ProgressBar bar;
private String mCurrentPhotoPath;
private final static int FILECHOOSER_RESULTCODE=1;
//public AsyncHttpUpload uploadThread = null;
public ArrayAdapter<String> adapter = null;
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Log.i("start","started");
/*
if ((savedInstanceState != null) && (savedInstanceState.getString("currPath")) != null){
mCurrentPhotoPath = savedInstanceState.getString("currPath");
}
*/
bar = (ProgressBar) this.findViewById(R.id.progressBar);
ActionBar actionBar = getActionBar();
actionBar.setDisplayShowTitleEnabled(true);
if (UserInfo.userId == null){
//fetchUserData();
}
else{
//UserInfo.populateSpinner(adapter);
}
mTitle = mDrawerTitle = getTitle();
mDrawerTitles = getResources().getStringArray(R.array.planets_array);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
// set a custom shadow that overlays the main content when the drawer opens
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
// set up the drawer's list view with items and click listener
mDrawerList.setAdapter(new ArrayAdapter<String>(this,
R.layout.drawer_list_item, mDrawerTitles));
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
// enable ActionBar app icon to behave as action to toggle nav drawer
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
// ActionBarDrawerToggle ties together the the proper interactions
// between the sliding drawer and the action bar app icon
mDrawerToggle = new ActionBarDrawerToggle(
this, /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */
R.string.drawer_open, /* "open drawer" description for accessibility */
R.string.drawer_close /* "close drawer" description for accessibility */
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
selectItem(0);
}
}
@SuppressLint("NewApi")
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.home, menu);
//MenuItem item = menu.findItem(R.id.accounts_spinner);
return super.onCreateOptionsMenu(menu);
}
public boolean onOptionsItemSelected(MenuItem item) {
// Handle presses on the action bar items
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
switch (item.getItemId()) {
case R.id.action_logout:
logOut();
return true;
case R.id.action_change_pw:
Intent intent = new Intent(this, ChangePw.class);
this.startActivity(intent);
return true;
// case R.id.accounts_spinner:
// Log.i("spinner","spinner click");
// return true;
default:
return super.onOptionsItemSelected(item);
}
}
@SuppressLint("NewApi")
private void logOut() {
// TODO Auto-generated method stub
Log.i("logout","to logout");
//clear data
UserInfo.chosenAccount = null;
//clear client cookies
String cookieString = "";
Log.i("number of cookies",Integer.toString(StartActivity.cookieManager.getCookieStore().getCookies().size()));
if(StartActivity.cookieManager.getCookieStore().getCookies().size() != 0){
//HttpCookie cookie = (HttpCookie) StartActivity.cookieManager.getCookieStore().getCookies().toArray()[0];
//HttpCookie cookie = (HttpCookie) StartActivity.cookieManager.getCookieStore().getCookies().get(0);
int login_cookie_index = 0;
List<HttpCookie> cookieList = (List<HttpCookie>) StartActivity.cookieManager.getCookieStore().getCookies();
//TODO: search for ltsid cookie
for (int cookie_iter = 0; cookie_iter < cookieList.size(); cookie_iter++){
if((cookieList.get(cookie_iter).getName()).equals("ltsid")){
login_cookie_index = cookie_iter;
break;
}
}
HttpCookie cookie = cookieList.get(login_cookie_index);
cookieString = cookie.getValue();
StartActivity.cookieManager.getCookieStore().removeAll();
}
//clear server sessionId
JSONObject data = new JSONObject();
JSONObject name = new JSONObject();
JSONArray arg = new JSONArray();
try{
data.put("requestCommand", "LogOut");
name.put("name","sessionId");
name.put("type", "String");
name.put("value", cookieString);
arg.put(name);
data.put("args", arg);
String finaldata = data.toString();
new AsyncHttpLogout(this).execute(finaldata);
} catch (JSONException e2) {
e2.printStackTrace();
}
this.finish();
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(event.getAction() == KeyEvent.ACTION_DOWN){
switch(keyCode)
{
case KeyEvent.KEYCODE_BACK:
finish();
return true;
} //TODO:can go forward
}
return super.onKeyDown(keyCode, event);
}
@SuppressLint("NewApi")
private void fetchUserData() {
int login_cookie_index = 0;
List<HttpCookie> cookieList = (List<HttpCookie>) StartActivity.cookieManager.getCookieStore().getCookies();
//TODO: search for ltsid cookie
for (int cookie_iter = 0; cookie_iter < cookieList.size(); cookie_iter++){
if((cookieList.get(cookie_iter).getName()).equals("ltsid")){
login_cookie_index = cookie_iter;
break;
}
}
HttpCookie cookie = cookieList.get(login_cookie_index);
JSONObject data = new JSONObject();
JSONObject sid = new JSONObject();
JSONArray arg = new JSONArray();
try {
data.put("requestCommand","FetchInfo");
sid.put("name","sessionId");
sid.put("type", "String");
sid.put("value", cookie.getValue());
arg.put(sid);
data.put("args", arg);
} catch (JSONException e2) {
e2.printStackTrace();
}
Log.i("fetch data",data.toString());
String finaldata = data.toString();
//View mySpinnerView = this.findViewById(R.id.accounts_spinner);
new AsyncGetAccountInfo(this,adapter).execute(finaldata);
}
@Override
public boolean onNavigationItemSelected(int position, long itemId) {
Log.i("arg0",Integer.toString(position));
//Log.i("arg1",Long.toString(itemId));
//UserInfo.chosenAccount = UserInfo.accountArray.get(position);
//TODO: fix default account
return false;
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
super.onSaveInstanceState(savedInstanceState);
// Save UI state changes to the savedInstanceState.
// This bundle will be passed to onCreate if the process is
// killed and restarted.
savedInstanceState.putString("currPath", mCurrentPhotoPath);
//savedInstanceState.
// etc.
}
/*
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
}
*/
private class DrawerItemClickListener implements ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
}
private void selectItem(int position) {
// update the main content by replacing fragments
if (position ==0){
Fragment fragment = new OrderForm();
Bundle args = new Bundle();
args.putInt(OrderForm.ARG_LIST_INDEX, position);
fragment.setArguments(args);
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(mDrawerTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
else if (position ==1){
Fragment fragment = new ServicesGrid();
Bundle args = new Bundle();
args.putInt(ServicesGrid.ARG_LIST_INDEX, position);
fragment.setArguments(args);
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(mDrawerTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
else if (position ==2){
Fragment fragment = new UserProfile();
Bundle args = new Bundle();
args.putInt(UserProfile.ARG_LIST_INDEX, position);
fragment.setArguments(args);
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(mDrawerTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
else if (position ==3){
Fragment fragment = new OrderList();
Bundle args = new Bundle();
args.putInt(OrderList.ARG_LIST_INDEX, position);
fragment.setArguments(args);
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(mDrawerTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
else if (position ==4){
}
else{
Fragment fragment = new PlanetFragment();
Bundle args = new Bundle();
args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
fragment.setArguments(args);
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(mDrawerTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
/* Called whenever we call invalidateOptionsMenu() */
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// If the nav drawer is open, hide action items related to the content view
//boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
//menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@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);
}
public static class PlanetFragment extends Fragment {
public static final String ARG_PLANET_NUMBER = "planet_number";
public PlanetFragment() {
// Empty constructor required for fragment subclasses
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_planet, container, false);
int i = getArguments().getInt(ARG_PLANET_NUMBER);
String planet = getResources().getStringArray(R.array.planets_array)[i];
int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),
"drawable", getActivity().getPackageName());
//((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);
getActivity().setTitle(planet);
return rootView;
}
}
}
有问题的片段位置= 3，片段的代码：
package com.example.home;
import java.io.File;
import java.io.IOException;
import java.net.HttpCookie;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.example.fmapp.R;
import com.example.fmapp.StartActivity;
import android.app.Fragment;
import android.app.ListFragment;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class OrderList extends ListFragment {
public static final String ARG_LIST_INDEX = "planet_number";
public OrderList(){
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_orderlist, container, false);
int i = getArguments().getInt(ARG_LIST_INDEX);
fetchOrderInfo();
String planet = getResources().getStringArray(R.array.planets_array)[i];
int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),
"drawable", getActivity().getPackageName());
//((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);
getActivity().setTitle(planet);
return rootView;
}
public void fetchOrderInfo() {
// TODO Auto-generated method stub
int login_cookie_index = 0;
List<HttpCookie> cookieList = (List<HttpCookie>) StartActivity.cookieManager.getCookieStore().getCookies();
//TODO: search for ltsid cookie
for (int cookie_iter = 0; cookie_iter < cookieList.size(); cookie_iter++){
if((cookieList.get(cookie_iter).getName()).equals("ltsid")){
login_cookie_index = cookie_iter;
break;
}
}
HttpCookie cookie = cookieList.get(login_cookie_index);
JSONObject data = new JSONObject();
JSONObject sid = new JSONObject();
JSONArray arg = new JSONArray();
try {
data.put("requestCommand","GetRequestInfo");
sid.put("name","sessionId");
sid.put("type", "String");
sid.put("value", cookie.getValue());
arg.put(sid);
data.put("args", arg);
} catch (JSONException e2) {
e2.printStackTrace();
}
Log.i("fetch data",data.toString());
String finaldata = data.toString();
//View mySpinnerView = this.findViewById(R.id.accounts_spinner);
new AsyncFetchUserOrders(getActivity(),this).execute(finaldata);
return;
}
/*
public void onListItemClick(ListView l, View v, int position, long id) {
Log.i("list click","list item click");
}
*/
public void populateAdapter(ArrayList<OrderObj> arrayOrderObj) {
ArrayAdapter<OrderObj> OrderList = new OrderAdapter(getActivity(), arrayOrderObj);
setListAdapter(OrderList);
}
}
请注意，如果我注释掉asynctask行，导航抽屉工作正常。
现在是asynctask代码：
package com.example.home;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.util.ArrayList;
import com.example.fmapp.GlobalVars;
import com.example.fmapp.JsonUtil;
import android.annotation.SuppressLint;
import android.app.ListFragment;
import android.content.Context;
import android.os.AsyncTask;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ProgressBar;
import android.widget.Toast;
public class AsyncFetchUserOrders extends AsyncTask<String,Boolean,Integer> {
protected static String USER_SERVER = GlobalVars.USER_SERVER;
private int errorCode = -1;
ProgressBar bar = Home.bar;
private Context mainContext;
private OrderList orderFragment;
//private Arra
private ArrayAdapter<String> adapter;
public ArrayList<OrderObj> arrayOrderObj = new ArrayList<OrderObj>();// TODO: populate this shit
private String toastMsg = null;
public AsyncFetchUserOrders(Context mainContext, OrderList orderFragment) {
this.mainContext = mainContext;
this.orderFragment = orderFragment;
}
protected void onPreExecute(){
bar.setVisibility(View.VISIBLE);
}
@SuppressLint("NewApi")
@Override
protected Integer doInBackground(String... params) {
URL url = null;
Log.i("req data",params[0]);
try {
url = new URL(USER_SERVER);
} catch (MalformedURLException e1) {
e1.printStackTrace();
}
HttpURLConnection urlConnection = null;
try {
urlConnection = (HttpURLConnection) url.openConnection();
} catch (IOException e1) {
e1.printStackTrace();
}
urlConnection.setReadTimeout( 10000 /*milliseconds*/ );
urlConnection.setConnectTimeout( 15000 /* milliseconds */ );
//urlConnection.setRequestProperty("X-Requested-With", "XMLHttpRequest");
urlConnection.setRequestProperty("Connection", "Keep-Alive");
try {
urlConnection.setDoOutput(true);
try {
urlConnection.setRequestMethod("POST");
} catch (ProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
urlConnection.connect();
OutputStream os = urlConnection.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
writer.write(params[0]);
writer.close();
os.close();
} catch (IOException e) {
e.printStackTrace();
}
//response:
try { //parse errorCode
if (urlConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
String response = urlConnection.getResponseMessage();
/*
InputStream responseStream = new BufferedInputStream(urlConnection.getInputStream());
BufferedReader responseStreamReader = new BufferedReader(new InputStreamReader(responseStream));
String line = "";
StringBuilder stringBuilder = new StringBuilder();
while ((line = responseStreamReader.readLine()) != null) {
stringBuilder.append(line);
Log.i("line",line);
}
responseStreamReader.close();
*/
BufferedReader in = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
String inputLine;
StringBuffer stringBuilder = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
stringBuilder.append(inputLine);
}
in.close();
String resp = stringBuilder.toString();
Log.i("resp",resp);
processResp(resp);
}
} catch (IOException e) {
e.printStackTrace();
}
}
finally {
urlConnection.disconnect();
}
return 1;
}
protected void onProgressUpdate(Integer... progress) {
}
protected void onPostExecute(Integer result) {
//Log.i("postexec","in post execute");
bar.setVisibility(View.GONE);
Toast toast = Toast.makeText(mainContext, toastMsg, Toast.LENGTH_SHORT);
toast.show();
if (JsonUtil.authSucess == false){
}
else{
// Imp TODO : get to new Activity
Log.i("ltid","populate spinner");
//IMP TODO :UserInfo.populateSpinner(adapter);
JsonUtil.authSucess = false;
/*
if (arrayOrderObj != null){
ArrayAdapter<OrderObj> OrderList = new OrderAdapter(mainContext, arrayOrderObj);
orderFragment.setListAdapter(OrderList);
}*/
}
//this.cancel(true);
}
/*
public void onStop() {
//super.onStop();
if(this!=null){
this.cancel(true);
}
}
*/
private void processResp(String resp) {
errorCode = JsonUtil.processRespForErrorCode(resp);
if (errorCode == 0){
JsonUtil.authSucess = true;
toastMsg = "Order info received";
//TODO: parse JSON and populate user orderinfo info
Log.i("orders", "to populate Order");
JsonUtil.populateOrderInfo(resp,arrayOrderObj);
//Log.i("fname",UserInfo.chosenAccount.firstName);
/*
ArrayAdapter<OrderObj> OrderList = new OrderAdapter(mainContext, arrayOrderObj);
orderFragment.setListAdapter(OrderList);
*/
//orderFragment.populateAdapter(arrayOrderObj);
}
else{
toastMsg = "Something wrong";
}
}
}
再一次，没有什么花哨的。仍然无法弄清楚是什么让导航抽屉关闭而不是启动片段，如果点击项目以启动另一个片段。 感谢。
答案 0 :(得分：0)
我想Home.bar会覆盖你的片段吗？也许您应该使用ProgressBar.show()或ProgressBar.dismiss()来控制进度条的可见性