The answer from Luksprog is so good that I thought I should list the code here: Absolutely perfect
main_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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/first_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/anchor" >
</ListView>
<View
android:id="@id/anchor"
android:layout_width="match_parent"
android:layout_height="5dp"
android:layout_centerVertical="true"
android:background="#99cc00" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/anchor" >
<ListView
android:id="@+id/second_list"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<FrameLayout
android:id="@+id/overlay"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#33c1c1c1"
android:visibility="gone" >
<ProgressBar
style="?android:attr/progressBarStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right|top"
android:indeterminate="true" />
</FrameLayout>
</RelativeLayout>
MainActivity.java
public class MainActivity extends Activity {
private String[] mItems = { "Item no.1", "Item no.2", "Item no.3",
"Item no.4", "Item no.5", "Item no.6", "Item no.7", "Item no.8",
"Item no.9", "Item no.10", "Item no.11", };
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
// setup the two ListViews
ListView firstList = (ListView) findViewById(R.id.first_list);
firstList.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, mItems));
firstList.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// just as an example, one you click an item in the first
// ListView
// a custom AsyncTask will kick in to load data in to the second
// ListView
new MyTask(MainActivity.this).execute((Void) null);
}
});
ListView secondList = (ListView) findViewById(R.id.second_list);
secondList.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, mItems));
secondList.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// just to test that you can't click the ListView if the data is
// loading
Toast.makeText(getApplicationContext(), "click",
Toast.LENGTH_SHORT).show();
}
});
}
private class MyTask extends AsyncTask<Void, Void, Void> {
private MainActivity mActivity;
private FrameLayout mFrameOverlay;
public MyTask(MainActivity activity) {
mActivity = activity;
}
@Override
protected void onPreExecute() {
// the AsyncTask it's about to start so show the overlay
mFrameOverlay = (FrameLayout) mActivity.findViewById(R.id.overlay);
// set a touch listener and consume the event so the ListView
// doesn't get clicked
mFrameOverlay.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return true;
}
});
mFrameOverlay.setVisibility(View.VISIBLE);
}
@Override
protected Void doInBackground(Void... params) {
// do heavy work
try {
Thread.sleep(6000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
//remove the overlay
mFrameOverlay.setVisibility(View.GONE);
// setup the ListView with the new obtained data
String[] obtainedData = { "D1", "D2", "D3" };
ListView theList = (ListView) mActivity
.findViewById(R.id.second_list);
theList.setAdapter(new ArrayAdapter<String>(mActivity,
android.R.layout.simple_list_item_1, obtainedData));
}
}
}
Luksprog, hope you don't mind me posting your code, just didn't want it to vanish from git and this answer be lost to others.
