Expandable Android list Black background when scrolling
I am struggling with ListView extension in Android. I am using the code provided in the apis demo, but I do not know how to solve my problem.
I have a white background on a white background, but when I scroll through the list it turns black.
I don't want this effect ... is there a way to change it? is there a way to customize the list using this code? I'm looking for something like this ... Hope you can help me! Thank:)
package com.example.android.apis.view;
import android.R;
import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.widget.ExpandableListAdapter;
import android.widget.SimpleExpandableListAdapter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Demonstrates expandable lists backed by a Simple Map-based adapter
*/
public class ExpandableList3 extends ExpandableListActivity {
private static final String NAME = "NAME";
private static final String IS_EVEN = "IS_EVEN";
private ExpandableListAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
List<Map<String, String>> groupData = new ArrayList<Map<String, String>>();
List<List<Map<String, String>>> childData = new ArrayList<List<Map<String, String>>>();
for (int i = 0; i < 20; i++) {
Map<String, String> curGroupMap = new HashMap<String, String>();
groupData.add(curGroupMap);
curGroupMap.put(NAME, "Group " + i);
curGroupMap.put(IS_EVEN, (i % 2 == 0) ? "This group is even" : "This group is odd");
List<Map<String, String>> children = new ArrayList<Map<String, String>>();
for (int j = 0; j < 15; j++) {
Map<String, String> curChildMap = new HashMap<String, String>();
children.add(curChildMap);
curChildMap.put(NAME, "Child " + j);
curChildMap.put(IS_EVEN, (j % 2 == 0) ? "This child is even" : "This child is odd");
}
childData.add(children);
}
// Set up our adapter
mAdapter = new SimpleExpandableListAdapter(
this,
groupData,
android.R.layout.simple_expandable_list_item_1,
new String[] { NAME, IS_EVEN },
new int[] { android.R.id.text1, android.R.id.text2 },
childData,
R.layout.simple_expandable_list_item_3,
new String[] { NAME, IS_EVEN },
new int[] { android.R.id.text1, android.R.id.text2 }
);
setListAdapter(mAdapter);
}
}
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Follow the instructions on this link:
Android Ressources for Android: Browsing History
In short: ... To fix this problem, all you have to do is either disable cache hint optimization if you are using a non-solid background color, or set the hint to the appropriate solid color value. You can do it from code (see SetCacheColorHint (int)) or preferably from XML using the android: cacheColorHint attribute. To disable optimization, just use transparent color # 00000000. The following screenshot shows a list with android: cacheColorHint = "# 00000000" set in the XML layout file ...
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