I am new to android and it is my first time to use Fragments. When this fragment is called and the user searches for some question in the "search_question" edittext and presses on the "search_question_button", the searched question should be passed to the following class "PaperlessRegistrationApplication" however the application stops when the line "app.getOpeContentSearchQuestion(userQuestion, this);" is reached. I will highly appreciate it if anyone could assist on this. Thank you.
package com.redone.pplr.opecontent.ui;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.text.TextUtils;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import com.redone.pplr.R;
import com.redone.pplr.app.PaperlessRegistrationApplication;
import com.redone.pplr.opecontent.model.OpeContentModel;
import java.util.List;
/**
* Created by user on 2/12/2015.
*/
public class OpeContentFragment extends ListFragment implements OpeContentListener {
private PaperlessRegistrationApplication app;
private EditText search_question;
private TextView error;
private Button search_question_button;
private int visibility = View.VISIBLE;
private int gone = View.GONE;
private String userQuestion;
private ListView opeContentList;
protected List<OpeContentModel> arrayOfList = null;
protected RowAdapter objAdapter;//instance of the rowadapter class
public OpeContentFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.ope_content_fragment, container, false);
search_question = (EditText) view.findViewById(R.id.search_question);
error = (TextView) view.findViewById(R.id.error);
search_question_button = (Button) view.findViewById(R.id.search_question_button);
opeContentList = (ListView) view.findViewById(android.R.id.list);
//when the search question button is clicked
search_question_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
userQuestion = search_question.getText().toString();
if (!TextUtils.isEmpty(userQuestion)) {
error.setVisibility(gone);
opeContentSearchQuestion(userQuestion);
} else {
error.setText("No Question was Searched");
error.setVisibility(visibility);
}
}
});
return view;
}
public void opeContentSearchQuestion(String userQuestion) {
Log.e("SearchQuestion", userQuestion);
app.getOpeContentSearchQuestion(userQuestion, this);
}
@Override
public void onSearchMostViewedQuestions(List<OpeContentModel> result) {
objAdapter = new RowAdapter(getActivity(), R.layout.ope_content_list_item,
arrayOfList);
opeContentList.setAdapter(objAdapter);
}
//custom adapter class implementation which reuses existing views as user scrolls
class RowAdapter extends ArrayAdapter<OpeContentModel> {
Context context;
protected List<OpeContentModel> items;
protected Activity activity;
protected int row;//list_item_products
protected OpeContentModel objBean;
public RowAdapter(Activity act, int resource,
List<OpeContentModel> arrayoflist) {
super(act, resource, arrayoflist);
this.activity = act;
this.row = resource;
this.items = arrayoflist;
}
//getview method is called for each item of ListView
@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
//a++;
View view = convertView;// single child element of the listview
ViewHolder holder = null;// a holder to temp layouts
// if the convertView is null, create a new view
if (view == null) {
// create a new view
//inflate the layout for each item of listview
LayoutInflater inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(row, null);
holder = new ViewHolder();
view.setTag(holder);
} else {
// resue the row to display newly generated data/recycle
holder = (ViewHolder) view.getTag();
}
if ((items == null) || ((position + 1) > items.size()))
return view;
objBean = items.get(position);
holder.question = (TextView) view.findViewById(R.id.ope_content_question);
holder.answer = (TextView) view.findViewById(R.id.ope_content_answer);
if(holder.question != null && objBean.getQuestion() != null){
holder.question.setText(objBean.getQuestion());
}
if(holder.answer != null && objBean.getAnswer() != null){
holder.answer.setText(objBean.getAnswer());
}
return view;
}
// create a temporary textview/imageview/varaible for store id by id
public class ViewHolder {
public TextView question;
public TextView answer;
}
}
}
I am getting the following error
02-14 11:11:50.719 1238-1238/com.redone.pplr D/dalvikvm﹕ GC_FOR_ALLOC freed 170K, 8% free 6771K/7344K, paused 5ms, total 5ms
02-14 11:11:50.727 1238-1238/com.redone.pplr W/IInputConnectionWrapper﹕ getTextAfterCursor on inactive InputConnection
02-14 11:11:50.819 1238-1238/com.redone.pplr D/pplr_SalesKitCntentLst﹕ getContent|response|{"contentList":[],"message":null,"messageCode":null,"status":"success"}
02-14 11:11:50.831 1238-1241/com.redone.pplr D/dalvikvm﹕ GC_CONCURRENT freed 324K, 8% free 6856K/7384K, paused 1ms+1ms, total 6ms
02-14 11:11:50.839 1238-1238/com.redone.pplr W/IInputConnectionWrapper﹕ finishComposingText on inactive InputConnection
02-14 11:11:50.943 1238-1238/com.redone.pplr W/IInputConnectionWrapper﹕ finishComposingText on inactive InputConnection
02-14 11:11:55.531 1238-1238/com.redone.pplr I/GCM﹕ Error :SERVICE_NOT_AVAILABLE
02-14 11:11:57.883 1238-1238/com.redone.pplr E/SearchQuestion﹕ i
02-14 11:11:57.883 1238-1238/com.redone.pplr D/AndroidRuntime﹕ Shutting down VM
02-14 11:11:57.887 1238-1238/com.redone.pplr W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xa613b908)
02-14 11:11:57.891 1238-1238/com.redone.pplr E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.redone.pplr.opecontent.ui.OpeContentFragment.opeContentSearchQuestion(OpeContentFragment.java:74)
at com.redone.pplr.opecontent.ui.OpeContentFragment$1.onClick(OpeContentFragment.java:61)
at android.view.View.performClick(View.java:4204)
at android.view.View$PerformClick.run(View.java:17355)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
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:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
