Question

public void onListItemClick(ListView parent, View v, int position, long id) 
  {         
      super.onListItemClick(parent, v, position, id);



  LayoutInflater inflater = (LayoutInflater)
       this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
 final PopupWindow pw = new PopupWindow(
       inflater.inflate(R.layout.offer_popup, null, false), 
       500, 
       600, 
       true);

 pw.showAtLocation(this.findViewById(android.R.id.list), Gravity.CENTER, 0, 0);    

ImageView closeimage=(ImageView) findViewById(R.id.imageView2);
closeimage.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    pw.dismiss();
    }
});

offer_popup.xml

 <?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="fill_parent"
android:theme="@android:style/Theme.Dialog"
android:orientation="vertical" android:weightSum="1">
 <RelativeLayout android:layout_width="fill_parent"
 android:id="@+id/relativeLayout_popup"
  android:layout_height="wrap_content" android:layout_weight="0.65">
    <ImageView android:layout_width="wrap_content"
     android:src="@drawable/node_largeview_black" 
     android:layout_height="wrap_content" 
     android:id="@+id/imageView1" 
     android:layout_alignParentTop="true" 
     android:layout_centerHorizontal="true"
      android:layout_marginTop="61dp"></ImageView>
    <ImageView android:id="@+id/imageView2" 
    android:layout_height="wrap_content" 
    android:src="@drawable/close_button" 
    android:layout_width="wrap_content" 
    android:layout_alignTop="@+id/imageView1"
     android:layout_alignRight="@+id/imageView1"></ImageView>
  </RelativeLayout>
 </LinearLayout>

i have a listview, and if I clicked on one of item row, a popup would created, using offer_popup.xml, inside this xml, there’s a imageView2 id which is a close image, and click on that, the popup would dismissed.

However, the program crashed closeimage=null.

Answer 1

View popView = inflater.inflate(R.layout.offer_popup, null, false);
final PopupWindow pw = new PopupWindow(popView
       , 
       500, 
       600, 
       true);
ImageView closeimage=(ImageView) popView.findViewById(R.id.imageView2);

change your code, to the above, you need to give the parent reference for the image to find it, if it’s not part of main layout.