我改變擴展活動來擴展片段和我的AsynkTask
類在擴展活動中很好地工作,但是當在擴展片段中使用並且在登錄到我的應用程序時關閉我稱爲類DownloadJson
在點擊我應該怎麼辦,請幫我當在片段中使用asynctask我的應用程序強制關閉
public class OmegaFragment extends Fragment implements View.OnClickListener {
JSONObject jsonobject;
JSONArray jsonarray;
private PendingIntent pendingIntent;
EditText ocUserName ;
EditText ocPassword;
View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_omega, container, false);
}
private class DownloadJSON extends AsyncTask<Void, Void, Integer> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Integer doInBackground(Void... params) {
// Create an array
int isCorrect= 0;
jsonarray = JSONfunctions.getJSONfromURL(mUrl);
EditText ocUserName1 =(EditText)view.findViewById(R.id.userNameText);
EditText ocPassword1 =(EditText)view.findViewById(R.id.passwordText);
isCorrect = 1;
return isCorrect;
}
@Override
protected void onPostExecute(Integer args) {
mFragmentCallback.onTaskDone();
super.onPostExecute(args);
mProgressDialog.dismiss();
}
}
public void onClick(View v) {
if (v.getId() == R.id.button1)
{
Button button = (Button) v;
// EditText ocUserName =(EditText)view.findViewById(R.id.userNameText);
// EditText ocPassword =(EditText)view.findViewById(R.id.passwordText);
boolean flag=true;
mUrl = global.apiurl +":"+global.apiport+ "/"+global.apiname+"/"+global.controller+"/" + ocUserName.getText().toString() + "/" + ocPassword.getText().toString() + "/0";
try {
isAccess = (new DownloadJSON().execute()).get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
if (isAccess == 1)
{
Intent intentMain = new Intent(getActivity() ,hozeactivity.class);
logcat的輸出:
11-22 23:19:18.822: ERROR/AndroidRuntime(1292): FATAL EXCEPTION: main
java.lang.NullPointerException
at com.mesbahSoft.quran.OmegaFragment.onClick(OmegaFragment.java:248)
at android.view.View.performClick(View.java:3460)
at android.view.View$PerformClick.run(View.java:13955)
at android.os.Handler.handleCallback(Handler.java:605)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4340)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
Post Logcat錯誤 – 2014-11-23 07:16:57
並解釋你在doInbackground – 2014-11-23 07:17:55
中試圖做什麼請發佈你的Logcat錯誤,但我想你可能在doInBackground方法中查找視圖時遇到一些問題。 – 2014-11-23 07:21:19