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我在我的應用程序中使用LoaderCallBacks，並從webservice獲取數據並將數據保存在包裝類中，如果數據狀態爲true我將保存bean類中的所有記錄，否則返回空列表。問題是它將數據引入但如果我恢復應用程序和diconnect互聯網，並再次打開應用程序，看看當時的結果我的應用程序崩潰它的工作正常的情況下，互聯網存在，而未能顯示空列表，如果互聯網沒有連接和發送錯誤01-30 23:12： 19.800：E/AndroidRuntime（24136）：致命異常：ModernAsyncTask＃2。使用Android中的Loader類禁用Internet時，應用程序崩潰了嗎？
ProposalListActivity.java
public class ProposalListActivity extends FragmentActivity {
public final static String ASSIGNED_USER_ID = "assignedUserId";
public static final String PROPOSAL_LIST_TYPE = "proposalListType";
public final static int ASSIGNED_PROPOSALS = 1;
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide fragments for each of the sections. We use a
* {@link android.support.v4.app.FragmentPagerAdapter} derivative, which will keep every loaded fragment in memory. If this becomes too memory
* intensive, it may be best to switch to a {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_proposal_list);
Log.i("Proposal list activity","Proposal list activity");
Log.i("sharedpreferences get Response in PP",""+SessionManager.getLoginResponse(getApplicationContext(),
"responseLogin"));
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.proposal_list, menu);
return true;
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
if(position == 0) {
Bundle args = new Bundle();
args.putInt(ProposalListActivity.ASSIGNED_USER_ID, 1);
args.putInt(PROPOSAL_LIST_TYPE,ASSIGNED_PROPOSALS);
ProposalListFragment frag = new ProposalListFragment();
frag.setArguments(args);
return frag;
}
}
**ProposalListFragment.java**
public class ProposalListFragment extends ListFragment implements LoaderManager.LoaderCallbacks<List<ProposalListItem>>{
private final static String TAG = ProposalListFragment.class.getName();
private ProposalListLoader proposalListLoader;
private ProposalListAdapter proposalListAdapter;
private int userId;
NetworkConnection networkConnection;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
networkConnection = new NetworkConnection(getActivity());
int proposalListType = getArguments().getInt(ProposalListActivity.PROPOSAL_LIST_TYPE);
switch (proposalListType) {
case ProposalListActivity.ASSIGNED_PROPOSALS:
userId = getArguments().getInt(ProposalListActivity.ASSIGNED_USER_ID);
break;
default:
break;
}
Log.i("net diable",""+networkConnection.isConnectingToInternet());
getLoaderManager().initLoader(100001, null, this);
}
@Override
public Loader<List<ProposalListItem>> onCreateLoader(int id, Bundle args) {
proposalListLoader = new ProposalListLoader(userId, getActivity());
return proposalListLoader;
}
@Override
public void onLoadFinished(Loader<List<ProposalListItem>> arg0,List<ProposalListItem> proposals) {
if(proposals == null)
{
Log.i(TAG,"INTERNET DISABLE ....OnLoadFinished of PP list fragment");
// getLoaderManager().destroyLoader(arg0.getId());
setListAdapter(proposalListAdapter);
if(isResumed()) {
setListShown(false);
} else {
setListShownNoAnimation(true);
}
}
else
{
proposalListAdapter = new ProposalListAdapter(getActivity(), proposalListLoader);
setListAdapter(proposalListAdapter);
if(isResumed()) {
setListShown(true);
} else {
setListShownNoAnimation(true);
}
}
}
}
ProposalListService.java 它是從服務
使數據public class ProposalListService {
private final static ProposalListService INSTANCE = new ProposalListService();
public List<ProposalListItem> getAssignedProposals(int surveyourId) {
MultiValueMap<String, Object> formData = new LinkedMultiValueMap<String, Object>();
formData.add("surveyour_id",String.valueOf(surveyourId));
//Populate the MultiValueMap being serialized and headers in an HttpEntity object to use for the request
HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<MultiValueMap<String, Object>>(formData, WorkflowRestService
.getInstance().getRequestHeaders());
// Perform the HTTP GET request
ResponseEntity<ProposalListItemHolder> responseEntity = WorkflowRestService.getInstance().getRestTemplate()
.exchange(WorkflowApp.getServicesURL()+"proposals/getProposals", HttpMethod.POST, requestEntity, ProposalListItemHolder.class);
Log.i("response Entity",""+responseEntity);
//convert the array to a list and return it
ProposalListItemHolder holder = responseEntity.getBody();
Log.i("response Entity body",""+responseEntity.getBody());
if ("true".equals(holder.getStatus()))
{ Log.i("holder.getProposalListItems",""+holder.getProposalListItems());
return holder.getProposalListItems();
}
else
Log.i("else block of pp",""+holder.getProposalListItems());
return Collections.EMPTY_LIST;
}
}
還有一個包裝數據，而唯一的問題適配器類和ListItemHolder類它是不是顯示空的名單/數據缺席互聯網，它墜毀並給予
**error 01-30 23:12:19.800: E/AndroidRuntime(24136): FATAL EXCEPTION: ModernAsyncTask #2**
can someone please help me its very weird error that is crashing app.Please help me
**EDIT added more logcat:**
> 01-30 23:30:55.970: I/internet connection cheking before calling doLogin()(25590): true
01-30 23:30:55.970: I/do login method(25590): login button clickedusername:kongpasswor:kongkong
01-30 23:30:55.970: I/try block login(25590): try block of initialize Loader
01-30 23:30:55.970: I/in loader(25590): login button clickedusername:kongpasswor:kongkong
01-30 23:30:55.970: I/login loader(25590): LoginLoader{422d8f28 id=0}
01-30 23:30:55.970: D/com.mrfs.android.surveyapp.model.User(25590): starting proposals loader...
01-30 23:30:55.970: D/com.mrfs.android.surveyapp.model.User(25590): load in background if
01-30 23:30:55.970: I/username(25590): kong
01-30 23:30:55.970: I/password(25590): kongkong
01-30 23:30:55.970: I/apkVersion(25590): 2013-07-10 01:18:26
01-30 23:30:57.295: I/response Entity Login(25590): <200 OK,[email protected],{Server=[nginx/1.4.4], Date=[Thu, 30 Jan 2014 07:37:36 GMT], Content-Type=[application/json], Transfer-Encoding=[chunked], Connection=[close], Access-Control-Allow-Origin=[*], X-Android-Sent-Millis=[1391106656297], X-Android-Received-Millis=[1391106657272]}>
01-30 23:30:57.295: I/response Entity Body Login Function(25590): [email protected]
01-30 23:30:57.295: I/LoginListService if condition(25590): Name: kong,Password: f10343d1dc8d44c8935b356aa3f8aae2,First Name: Kongmesssage:Successfully Logged In.status:true
01-30 23:30:57.295: D/com.mrfs.android.surveyapp.model.User(25590): load in background else
01-30 23:30:57.300: D/com.mrfs.android.surveyapp.model.User(25590): delivering login, size
01-30 23:30:57.300: I/status(25590): Name: kong,Password: f10343d1dc8d44c8935b356aa3f8aae2,First Name: Kong
01-30 23:30:57.580: W/IInputConnectionWrapper(25590): showStatusIcon on inactive InputConnection
01-30 23:31:04.940: I/Proposal list activity(25590): Proposal list activity
01-30 23:31:04.940: I/sharedpreferences get Response in PP(25590): not null
01-30 23:31:04.960: I/net diable(25590): false
01-30 23:31:04.965: D/AbsListView(25590): Get MotionRecognitionManager
01-30 23:31:04.965: D/com.mrfs.android.surveyapp.loader.ProposalListLoader(25590): starting proposals loader...
01-30 23:31:04.965: D/com.mrfs.android.surveyapp.loader.ProposalListLoader(25590): proposals not found in cache, loading proposals...
01-30 23:31:04.970: I/net diable(25590): false
01-30 23:31:04.970: W/dalvikvm(25590): threadid=15: thread exiting with uncaught exception (group=0x416162a0)
01-30 23:31:04.970: D/AbsListView(25590): Get MotionRecognitionManager
01-30 23:31:04.970: E/AndroidRuntime(25590): FATAL EXCEPTION: ModernAsyncTask #3
01-30 23:31:13.300: I/Choreographer(25590): Skipped 491 frames! The application may be doing too much work on its main thread.
[格式化代碼& logcat的正確]
你能粘貼更多的日誌嗎？ –
我也有同樣的問題，然後我所做的是，如果是的話，你可以檢查互聯網連接是否可用，如果是，那麼轉到內容，如果不是隻顯示警告框。 – InnocentKiller
請貼上你的日誌。 – SMR