我已在我的应用中实现了代码，用于展开和折叠此链接的列表视图https://github.com/tjerkw/Android-SlideExpandableListView但是给我一个例外
Java.lang.NullPointerException
> E/AndroidRuntime(826): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:353)
E/AndroidRuntime(826): at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323)
E/AndroidRuntime(826): at com.ojaswitech.bookingscape.library.ActionSlideExpandableListView$1.getView(ActionSlideExpandableListView.java:39)
E/AndroidRuntime(826): at com.ojaswitech.bookingscape.library.AbstractSlideExpandableListAdapter.getView(AbstractSlideExpandableListAdapter.java:54)
我尝试了很多解决方案，但没有实现我的目标。我附上我的代码。请有人有解决方案。如果有人有另一种方法来完成这项任务，请告诉我。
以下是可扩展listview的代码
public class DetailActivity extends SherlockActivity {
private String URL = "http://10.0.2.2:80/project";
private String[] bungLowList;
private static final String BANGLOW_NAME = "banglow_name";
private ListAdapter bunglowAdapter;
ActionSlideExpandableListView listSlide;
private ListView listVw;
String unitStatus;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bungalows);
// get listview id in ActionSlideExpandableListView
listSlide = (ActionSlideExpandableListView)this.findViewById(R.id.bangDetlist);
.....
dataAdapter = ArrayAdapter.createFromResource(getApplicationContext(),
R.array.booking_status,android.R.layout.simple_spinner_item);
dataAdapter.setDropDownViewResource(
android.R.layout.simple_spinner_dropdown_item);
availSpnr.setAdapter(dataAdapter);
availSpnr.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View arg1,
int pos, long arg3) {
lnrLayForTxtNoRec.setVisibility(View.GONE);
unitStatus = parent.getItemAtPosition(pos).toString();
new LoadDataFrmSrvr().execute();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
//this listener for listview to expand toolbar
listSlide.setItemActionListener(new ActionSlideExpandableListView.OnActionClickListener() {
@Override
public void onClick(View listView, View buttonview, int position) {
String actionName = "";
if(buttonview.getId() == R.id.bangDetbuttonA) {
actionName = "buttonA";
} else {
actionName = "ButtonB";
}
Toast.makeText(
DetailActivity.this,
"Clicked Action: "+actionName+" in list item "+position,
Toast.LENGTH_LONG
).show();
}
// this is needed in order for the listview to discover the buttons
}, R.id.bangDetbuttonA, R.id.bangDetbuttonB);
}
private class LoadDataFrmSrvr extends AsyncTask<String,Void, Void> {
protected Void doInBackground(String... params) {
Log.v("In Bunglows", "Background");
String jsonpBuildingList = dataFromSrvr.makeHttpReqToSrvr(URL, "POST",
projBuildingDetail);
..........................
try {
JSONArray jsonArray = new JSONArray(jsonpBuildingList);
bungLowList = new String[jsonArray.length()];
if(jsonArray.length()>0) {
for(int i =0; i < jsonArray.length();i++) {
bungLowList[i] = jsonArray.getString(i);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
bunglowAdapter = new ArrayAdapter<String>(getApplicationContext(),
R.layout.expandable_list_item, R.id.bangDetlist, bungLowList);
listSlide.setAdapter(bunglowAdapter);
super.onPostExecute(result);
}
}
以下布局适用于listview
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/bangDetMainLnr"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:background="@color/White"
android:orientation="vertical" >
<Spinner
android:id="@+id/bangDetSpnrAvl"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_marginRight="8dp"
android:layout_weight="0.34"
android:background="@drawable/spinner_background_ab_new_theme_bs"
android:prompt="@string/select_mode"
android:spinnerMode="dropdown" />
<com.ojaswitech.bookingscape.library.ActionSlideExpandableListView
android:id="@+id/bangDetlist"
android:layout_width="300dp"
android:layout_height="fill_parent"
android:layout_marginTop="17dp"
android:background="@color/White"
android:divider="@color/white_gray"
android:dividerHeight="4.0dp"
android:listSelector="@drawable/list_selector" />
</LinearLayout>
以下是listview展开时的布局
?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<RelativeLayout
android:id="@+id/bangDetitem"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/bangDetTitle"
android:textIsSelectable="false"
android:textSize="40sp"
android:textColor="@color/gray"/>
<ImageView
android:id="@+id/bangDetexpandable_toggle_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:contentDescription="@string/todo"
android:src="@android:drawable/arrow_down_float"
/>
</RelativeLayout>
<!--*** TOOLBAR LAYOUT ****-->
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="@+id/bangDetToolBar"
android:background="@color/white_gray_dark">
<Button
android:id="@+id/bangDetbuttonA"
android:layout_width="fill_parent"
android:layout_height="fill_parent" android:layout_weight="0.5"
android:text="Keep on Hold"
android:textSize="12sp"/>
<Button
android:id="@+id/bangDetbuttonB"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="0.5"
android:text="Book"
android:textSize="12sp"/>
</LinearLayout>
</LinearLayout>
提前致谢