如何从Expandable ListView项目中获取第三级项目，我需要基于listview项目进入特定的活动。帮帮我。
public class MainActivity extends AppCompatActivity {
private ExpandableListView expandableListView;
String[] parent = new String[]{"Rooms"};
String[] q1 = new String[]{"Living Room", "Dining Room","Bed Room","Kitchen","Outdoor Living"};
String[] q2 = new String[]{"Linear Layout", "Relative Layout"};
String[] q3 = new String[]{"Recycle View"};
String[] des1 = new String[]{"Living Room Sets","Sofas & LoveSeats","Sectional Sofas","Sofa Sleeper","Pillows","Chairs","Coffee & End tables","Table Sets","Consoles & Desks","TV Consoles","Ottoman","Accent tables","Chaises","Pouf","Recliners","Serving Carts","Stools"};
LinkedHashMap<String, String[]> thirdLevelq1 = new LinkedHashMap<>();
LinkedHashMap<String, String[]> thirdLevelq2 = new LinkedHashMap<>();
LinkedHashMap<String, String[]> thirdLevelq3 = new LinkedHashMap<>();
/**
* Second level array list
*/
List<String[]> secondLevel = new ArrayList<>();
/**
* Inner level data
*/
List<LinkedHashMap<String, String[]>> data = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setUpAdapter();
}
private void setUpAdapter() {
secondLevel.add(q1);
secondLevel.add(q2);
secondLevel.add(q3);
thirdLevelq1.put(q1[0], des1);
thirdLevelq1.put(q1[1], des1);
thirdLevelq1.put(q1[2], des1);
thirdLevelq1.put(q1[3], des1);
thirdLevelq1.put(q1[4], des1);
data.add(thirdLevelq1);
data.add(thirdLevelq2);
data.add(thirdLevelq3);
expandableListView = (ExpandableListView) findViewById(R.id.expandible_listview);
//passing three level of information to constructor
ThreeLevelListAdapter threeLevelListAdapterAdapter = new ThreeLevelListAdapter(this, parent, secondLevel, data);
expandableListView.setAdapter(threeLevelListAdapterAdapter);
expandableListView.setOnChildClickListener(new
ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView expandableListView, View view, int groupPosition, int childPosition, long id) {
//here I got confused
// I need to get a particular child item for the String data variable
String info= thirdLevelq1.get(groupPosition).get(childPosition);
if(info=="chairs")
{
Intent i1 = new Intent(getApplicationContext(), chairs.class);
startActivity(i1);
}
return false;
}
});
expandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
int previousGroup = -1;
@Override
public void onGroupExpand(int groupPosition) {
if (groupPosition != previousGroup)
expandableListView.collapseGroup(previousGroup);
previousGroup = groupPosition;
}
});
}
}
下面是三级可扩展listView的第二级适配器
public class SecondLevelAdapter extends BaseExpandableListAdapter {
private Context context;
List<String[]> data;
String[] headers;
ImageView ivGroupIndicator;
public SecondLevelAdapter(Context context, String[] headers, List<String[]> data) {
this.context = context;
this.data = data;
this.headers = headers;
}
@Override
public Object getGroup(int groupPosition) {
return headers[groupPosition];
}
@Override
public int getGroupCount() {
return headers.length;
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row_second, null);
TextView text = (TextView) convertView.findViewById(R.id.rowSecondText);
String groupText = getGroup(groupPosition).toString();
text.setText(groupText);
return convertView;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
String[] childData;
childData = data.get(groupPosition);
return childData[childPosition];
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row_third, null);
TextView textView = (TextView) convertView.findViewById(R.id.rowThirdText);
String[] childArray = data.get(groupPosition);
String text = childArray[childPosition];
textView.setText(text);
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
String[] children = data.get(groupPosition);
return children.length;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
下面是三级可扩展listView的三级适配器
public class ThreeLevelListAdapter extends BaseExpandableListAdapter {
String[] parentHeaders;
List<String[]> secondLevel;
private Context context;
List<LinkedHashMap<String, String[]>> data;
/**
* Constructor
* @param context
* @param parentHeader
* @param secondLevel
* @param data
*/
public ThreeLevelListAdapter(Context context, String[] parentHeader, List<String[]> secondLevel, List<LinkedHashMap<String, String[]>> data) {
this.context = context;
this.parentHeaders = parentHeader;
this.secondLevel = secondLevel;
this.data = data;
}
@Override
public int getGroupCount() {
return parentHeaders.length;
}
@Override
public int getChildrenCount(int groupPosition) {
// no idea why this code is working
return 1;
}
@Override
public Object getGroup(int groupPosition) {
return groupPosition;
}
@Override
public Object getChild(int group, int child) {
return child;
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row_first, null);
TextView text = (TextView) convertView.findViewById(R.id.rowParentText);
text.setText(this.parentHeaders[groupPosition]);
return convertView;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
final SecondLevelExpandableListView secondLevelELV = new SecondLevelExpandableListView(context);
String[] headers = secondLevel.get(groupPosition);
List<String[]> childData = new ArrayList<>();
HashMap<String, String[]> secondLevelData = data.get(groupPosition);
for (String key : secondLevelData.keySet()) {
childData.add(secondLevelData.get(key));
}
secondLevelELV.setAdapter(new SecondLevelAdapter(context, headers, childData));
secondLevelELV.setGroupIndicator(null);
secondLevelELV.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
int previousGroup = -1;
@Override
public void onGroupExpand(int groupPosition) {
if (groupPosition != previousGroup)
secondLevelELV.collapseGroup(previousGroup);
previousGroup = groupPosition;
}
});
return secondLevelELV;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
下面是三级可扩展listView的SecondLevelExpandableListView
public class SecondLevelExpandableListView extends ExpandableListView {
public SecondLevelExpandableListView(Context context) {
super(context);
}
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
heightMeasureSpec = MeasureSpec.makeMeasureSpec(999999, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}