我有一个场景,在这个场景中,当我点击按钮时,我希望AlertDialog弹出。AlertDialog是一个自定义的警报对话框,因为它有自定义的Listview。
我正在使用以下代码将AlertDialog分配给按钮的OnClick:
这是我的自定义Baseadapter用于自定义listview。
这是topinglist.xml文件。
我正在使用以下代码将AlertDialog分配给按钮的OnClick:
top.setOnClickListener(new OnClickListener() {
Context mcontext;
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
LayoutInflater li = LayoutInflater.from(getActivity());
View view= li.inflate(R.layout.topingslist, null);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
alertDialogBuilder.setView(view);
ListView lv2 = (ListView) getActivity().findViewById(R.id.toplist);
ArrayList<SearchResultsToping> results1 = new ArrayList<SearchResultsToping>();
SearchResultsToping sr1;
sr1 = new SearchResultsToping();
sr1.setToppingname("cheese");
results1.add(sr1);
MyCustomBaseAdapterTop arrayAdapter=new MyCustomBaseAdapterTop(getActivity(), results1);
lv2.setAdapter(arrayAdapter);
lv2.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,long arg3) {
// TODO Auto-generated method stub
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
alertDialogBuilder
.setCancelable(false)
.setPositiveButton("OK",new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog,int id) {
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
dialog.cancel()
}
});
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}
});
这是我的自定义Baseadapter用于自定义listview。
public class MyCustomBaseAdapterTop extends BaseAdapter {
private static ArrayList<SearchResultsToping> searchArrayListtop;
private LayoutInflater mInflater;
Context ctx=null;
public MyCustomBaseAdapterTop(Activity activty, ArrayList<SearchResultsToping> results1) {
searchArrayListtop = results1;
this.ctx=activty;
mInflater = activty.getLayoutInflater();
}
@Override
public int getCount() {
// TODO Auto-generated method stub
// return 0;
return searchArrayListtop.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
//return searchArrayListtop.get(arg0);
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int arg0, View convertView, ViewGroup arg2) {
// TODO Auto-generated method stub
final ViewHolder holder;
if (convertView == null) {
Log.d("base", "listbase");
convertView = mInflater.inflate(R.layout.each_toping, null);
holder = new ViewHolder();
holder.txttopname = (TextView) convertView.findViewById(R.id.topname);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.txttopname.setText(searchArrayListtop.get(arg0).getToppingname());
return convertView;
}
static class ViewHolder {
TextView txttopname;
}
}
这是topinglist.xml文件。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/toplist"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:cacheColorHint="#0000"
android:divider="@android:color/transparent"
android:dividerHeight="0dp" />
</LinearLayout>
我在将 Adapter
设置到 Listview
上的这一行代码中 lv2.setAdapter(arrayAdapter);
遇到了 NullPointerException
,请帮助我解决。
R.layout.topingslist
布局代码。 - SathishKumarListView lv2 = (ListView) view.findViewById(R.id.toplist);
吗? - SathishKumar