我尝试在展开折叠或展开时交换expandablelistview组背景图片。但是背景图像没有正确交换。例如,当我展开第一组时,第二组或第三组的背景会被交换。
我正在使用RelativeLayout(组布局)和SimpleExpandableListAdapter(适配器)。这是我做的:
// Create 2 drawable background. One for collapse and one for expand
private Drawable collapseBG, expandBG;
private ExpandableListView myView;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
collapseBG = getResources().getDrawable(R.drawable.box_bg_header_collapse);
expandBG = getResources().getDrawable(R.drawable.box_bg_header_expand);
myView = (ExpandableListView) findViewById(R.id.myView);
}
myView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
public void onGroupCollapse(int groupPosition_c) {
myView.getChildAt(groupPosition_c).setBackgroundDrawable(collapseBG);
}
});
myView.setOnGroupExpandListener (new ExpandableListView.OnGroupExpandListener() {
public void onGroupExpand(int groupPosition_e) {
myView.getChildAt(groupPosition_e).setBackgroundDrawable(expandBG);
}
});
有人知道如何使其有效吗?
答案 0 :(得分:23)
我认为您应该制作自己的extends SimpleExpandableListAdapter
适配器。在该课程中你应该覆盖
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
View result = super.getGroupView(groupPosition, isExpanded, convertView, parent);
if (isExpanded) {
result.setBackgroundDrawable(expandBG);
} else {
result.setBackgroundDrawable(collapseBG);
}
return result;
}
在onCreate函数中你应该写如下的smth:
myView.setlistAdapter (new YourExtendedSimpleExpandableListAdapter( ...... ));
希望它会帮助你
答案 1 :(得分:1)
试试这个
//this is my list
ExpandableListView epView = (ExpandableListView) findViewById(R.id.TranscationList);
//set two listeners
//i have to images
epView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
ImageView arrowDown;
ImageView arrowUp;
arrowUp = (ImageView)findViewById(R.id.arrowUp);
arrowDown =(ImageView)findViewById(R.id.arrowDown);
arrowUp.setVisibility(View.INVISIBLE);
arrowDown.setVisibility(View.VISIBLE);
}
});
epView.setOnGroupExpandListener(new OnGroupExpandListener() {
@Override
public void onGroupExpand(int arg0) {
ImageView arrowDown;
ImageView arrowUp;
arrowUp = (ImageView)findViewById(R.id.arrowUp);
arrowDown =(ImageView)findViewById(R.id.arrowDown);
arrowUp.setVisibility(View.VISIBLE);
arrowDown.setVisibility(View.INVISIBLE);
}
});