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Hi there！我正在研究一個應用程序，我需要從Mysql數據庫填充ListView。此填充列表必須顯示在片段中。無法使用Json在片段上填充ListView
public class AppsTabFragment extends ListFragment
{
private ProgressDialog pdialog;
ListView listView;
JSONParser jparser = new JSONParser();
ArrayList<HashMap<String,String>> appslist;
public String url_all_apps="http://10.0.2.2/sisoft/get_all_apps.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_APPS = "appname";
private static final String TAG_PID = "id";
private static final String TAG_NAME = "appname";
MainActivity main=new MainActivity();
// products JSONArray
JSONArray apps = null;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.apps_tab_fragment, container, false);
listView = (ListView) view.findViewById(android.R.id.list);
listView = getListView();
return view;
}
@Override
public void onViewCreated(View view,Bundle SavedInstanceState)
{
appslist = new ArrayList<HashMap<String,String>>();
new loadAllApps().execute();
}
class loadAllApps extends AsyncTask<String, String, String>{
@Override
protected void onPreExecute() {
super.onPreExecute();
pdialog = new ProgressDialog(getActivity());
pdialog.setMessage("Loading apps. Please wait...");
pdialog.setIndeterminate(false);
pdialog.setCancelable(true);
pdialog.show();
}
@Override
protected String doInBackground(String... arg0) {
// TODO Auto-generated method stub
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jparser.makeHttpRequest(url_all_apps, "GET", params);
// Check your log cat for JSON response
Log.d("All apps: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
apps = json.getJSONArray(TAG_APPS);
// looping through All Products
for (int i = 0; i < apps.length(); i++) {
JSONObject c = apps.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_PID);
String name = c.getString(TAG_NAME);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_PID, id);
map.put(TAG_NAME, name);
// adding HashList to ArrayList
appslist.add(map);
}
} else {
// no apps found
// Launch Add New product Activity
getActivity().finish();
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pdialog.dismiss();
// updating UI from Background Thread
getActivity().runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
getActivity(), appslist,
R.layout.list_apps, new String[] { TAG_PID,
TAG_NAME},
new int[] { R.id.id, R.id.appname });
// updating listview
listView.setAdapter(adapter);
}
});
}
}
}
這是我的LogCat顯示錯誤。
06-06 06:12:43.834: D/dalvikvm(862): GC_CONCURRENT freed 72K, 8% free 2781K/2996K, paused 14ms+22ms, total 172ms
06-06 06:12:44.344: D/AndroidRuntime(862): Shutting down VM
06-06 06:12:44.344: W/dalvikvm(862): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
06-06 06:12:44.454: E/AndroidRuntime(862): FATAL EXCEPTION: main
06-06 06:12:44.454: E/AndroidRuntime(862): java.lang.IllegalStateException: Content view not yet created
06-06 06:12:44.454: E/AndroidRuntime(862): at android.support.v4.app.ListFragment.ensureList(ListFragment.java:328)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.support.v4.app.ListFragment.getListView(ListFragment.java:222)
06-06 06:12:44.454: E/AndroidRuntime(862): at com.sisoft.sisoftstore.fragment.AppsTabFragment.onCreateView(AppsTabFragment.java:45)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:461)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.support.v4.view.ViewPager.populate(ViewPager.java:1011)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.support.v4.view.ViewPager.populate(ViewPager.java:880)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1374)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.View.measure(View.java:15518)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.View.measure(View.java:15518)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.View.measure(View.java:15518)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.View.measure(View.java:15518)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
06-06 06:12:44.454: E/AndroidRuntime(862): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.View.measure(View.java:15518)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.Choreographer.doFrame(Choreographer.java:532)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.os.Handler.handleCallback(Handler.java:725)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.os.Handler.dispatchMessage(Handler.java:92)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.os.Looper.loop(Looper.java:137)
06-06 06:12:44.454: E/AndroidRuntime(862): at android.app.ActivityThread.main(ActivityThread.java:5041)
06-06 06:12:44.454: E/AndroidRuntime(862): at java.lang.reflect.Method.invokeNative(Native Method)
06-06 06:12:44.454: E/AndroidRuntime(862): at java.lang.reflect.Method.invoke(Method.java:511)
06-06 06:12:44.454: E/AndroidRuntime(862): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-06 06:12:44.454: E/AndroidRuntime(862): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-06 06:12:44.454: E/AndroidRuntime(862): at dalvik.system.NativeStart.main(Native Method)
06-06 06:17:44.713: I/Process(862): Sending signal. PID: 862 SIG: 9
它在行listView = getListView();處顯示錯誤。但是，當我刪除這條線時，它顯示了這樣的錯誤。
06-06 07:04:06.705: E/AndroidRuntime(1753): java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
任何人都可以幫助我解決這個問題嗎？如果有人幫我解決這個問題，我會非常感激。
感謝回答我的問題。但我仍然有一些問題。 – user3698004
我已經刪除了行listView = view.findViewById（android.R.Id.list）。現在我使用ListView = getListView（）。 – user3698004
現在它顯示錯誤是在行listView = getListView，它說「內容視圖尚未創建」。 – user3698004