嗨，我想从json创建三级可扩展列表视图。
我已经创建了可扩展的列表视图，处于两个两个级别，但是三个级别的我都没有怎么做，如果有人请请帮助我完成它。
这是我创建的代码。
我的主要活动
String Tag="MainActivity";
private ExpandableListView expandableListView;
ArrayList<String>mainlist =new ArrayList<>();;
HashMap<String, List<String>> childContent = new HashMap<String, List<String>>();
HashMap<String, HashMap<List<String>,List<String>>> subchildContent = new HashMap<String, HashMap<List<String>,List<String>>>();
List<String> childlist;
List<String> subchildlist;
private List<String> parentHeaderInformation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new ReleaseOverviewReleaseAsynchTask().execute();
}
@Override
protected void onResume() {
super.onResume();
expandableListView = (ExpandableListView)findViewById(R.id.expandableListView);
//ExpandableListAdapter expandableListViewAdapter = new ExpandableListAdapter(getApplicationContext(), mainlist, childContent);
ChildSubChildExpandableListAdapter adapter=new ChildSubChildExpandableListAdapter(getApplicationContext(),mainlist,childlist,childContent);
expandableListView.setAdapter(adapter);
}
class ReleaseOverviewReleaseAsynchTask extends AsyncTask<Void,Void,Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... params) {
String jsonStr = Util.loadJSONFromAsset(MainActivity.this,"release.json");
if (jsonStr != null) {
try {
JSONArray array = new JSONArray(jsonStr);
for (int i = 0; i < array.length(); i++) {
JSONObject jo_object = array.getJSONObject(i);
childlist= new ArrayList<String>();
subchildlist= new ArrayList<String>();
String release= jo_object.get("Release").toString();
mainlist.add(jo_object.get("Release").toString());
Log.i("main release",release);
JSONArray jsonArrayDetails=jo_object.getJSONArray("details");
if (!jsonArrayDetails.isNull(i)){
JSONObject jo_object1 = jsonArrayDetails.getJSONObject(i);
String builddate= jo_object1.get("Build Date").toString();
Log.i(Tag,builddate);
String deploydate= jo_object1.get("Deploy Date").toString();
Log.i(Tag,deploydate);
String respindate= jo_object1.get("Respin Date").toString();
Log.i(Tag,respindate);
String releaselead= jo_object1.get("Release Lead").toString();
Log.i(Tag,releaselead);
String engineerlead= jo_object1.get("Engineering Lead").toString();
Log.i(Tag,engineerlead);
String testlead=jo_object1.get("Test Lead").toString();
Log.i(Tag,testlead);
}
JSONArray childarray=jo_object.getJSONArray("children");
for (int i_child = 0; i_child < childarray.length(); i_child++) {
JSONObject jo_objectchild = childarray.getJSONObject(i_child);
childlist.add(jo_objectchild.get("Release").toString());
Log.i("child release",jo_objectchild.get("Release").toString());
JSONArray subchildarray=jo_objectchild.getJSONArray("children");
for (int i_subchild=0;i_subchild<=subchildarray.length();i_subchild++){
if (!subchildarray.isNull(i_subchild)){
JSONObject jo_objectsubchild = subchildarray.getJSONObject(i_subchild);
Log.i("sub release",jo_objectsubchild.get("Release").toString());
subchildlist.add(jo_objectsubchild.get("Release").toString());
}
/*JSONObject jo_objectsubchild = subchildarray.getJSONObject(i_subchild);
*/
}
}
childContent.put(mainlist.get(i),subchildlist);
}
}
catch (JSONException e) {
e.printStackTrace();
}
}
else{
// Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
我的父级可扩展列表视图是
public class ExpandableListAdapter extends BaseExpandableListAdapter {
private Context context;
private List<String> parentDataSource;
private HashMap<String, List<String>> childDataSource;
private HashMap<String, List<String>> subchildDataSource;
public ExpandableListAdapter(Context context, List<String> childParent, HashMap<String, List<String>> child){
this.context = context;
this.parentDataSource = childParent;
this.childDataSource = child;
}
@Override
public int getGroupCount() {
return this.parentDataSource.size();
}
@Override
public int getChildrenCount(int groupPosition) {
return this.childDataSource.get(this.parentDataSource.get(groupPosition)).size();
}
@Override
public Object getGroup(int groupPosition) {
return parentDataSource.get(groupPosition);
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return this.childDataSource.get(parentDataSource.get(groupPosition)).get(childPosition);
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
View view = convertView;
if(view == null){
LayoutInflater inflater = (LayoutInflater)this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.parentlayout, parent, false);
}
String parentHeader = (String)getGroup(groupPosition);
TextView parentItem = (TextView)view.findViewById(R.id.parent_layout);
parentItem.setText(parentHeader);
notifyDataSetChanged();
return view;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
View view = convertView;
if(view == null){
LayoutInflater inflater = (LayoutInflater)this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.childlayout, parent, false);
}
String childName = (String)getChild(groupPosition, childPosition);
TextView childItem = (TextView)view.findViewById(R.id.child_layout);
childItem.setText(childName);
notifyDataSetChanged();
return view;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
这是三个级别的可扩展列表，不适用于我
public class ChildSubChildExpandableListAdapter extends
BaseExpandableListAdapter{
Context context;
HashMap<String, List<String>> childdata;
private List<String> parentDataSource;
List<String> secondLevel;
private HashMap<String, List<String>> childDataSource;
public ChildSubChildExpandableListAdapter(Context context, List<String> Parent, List<String> secondLevel, HashMap<String, List<String>> data) {
this.context = context;
this.parentDataSource = Parent;
this.secondLevel = secondLevel;
this.childdata = data;
}
@Override
public int getGroupCount() {
return this.parentDataSource.size();
}
@Override
public int getChildrenCount(int groupPosition) {
return 1;
}
@Override
public Object getGroup(int i) {
return i;
}
@Override
public Object getChild(int i, int i1) {
return i1;
}
@Override
public long getGroupId(int i) {
return i;
}
@Override
public long getChildId(int i, int i1) {
return i1;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public View getGroupView(int groupPosition, boolean b, View convertView, ViewGroup viewGroup) {
View view = convertView;
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.parentlayout, null);
TextView text = (TextView) convertView.findViewById(R.id.parent_layout);
text.setText(this.parentDataSource.get(groupPosition));
return convertView;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup group) {
final SecondLevelExpandableListView secondLevelELV = new SecondLevelExpandableListView(context);
String headers =secondLevel.get(groupPosition);
List<String> header=new ArrayList<>();
header.add(headers);
List<List<String>> childData = new ArrayList<>();
HashMap<String, List<String>> secondLevelData= (HashMap<String, List<String>>) childdata.get(groupPosition);
for(String key : secondLevelData.keySet())
{
childData.add(secondLevelData.get(key));
}
secondLevelELV.setAdapter(new ExpandableListAdapter(context, header,secondLevelData));
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 i, int i1) {
return true;
}
}
这是第二级可扩展列表视图
public class SecondLevelExpandableListView extends ExpandableListView
{
public SecondLevelExpandableListView(Context context) {
super(context);
}
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//999999 is a size in pixels. ExpandableListView requires a maximum height in order to do measurement calculations.
heightMeasureSpec = MeasureSpec.makeMeasureSpec(999999, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
嗨，朋友们，请帮助我创建三个级别的可扩展性。如果我仅使用ExpandableListAdapter，则上面的代码有效。
在上面的代码中，我已经将childSubChildAdapter用于三个级别，所以它不起作用
我想在列表的每个元素中添加复选框，如果我选择一个孩子，则还应该选择其父对象
这是我的杰森
{
"Release": "16.1",
"details": [],
"children": [
{
"Release": "16.1R3",
"details": [
{
"Build Date": "",
"Deploy Date": "",
"Respin Date": "",
"Release Lead": "Jl",
"Engineering Lead": "LG",
"Test Lead": "Dl"
}
],
"children": [
{
"Release": "16.1R3-S5",
"details": [
{
"Build Date": "2017-08-17",
"Deploy Date": "2017-08-25",
"Respin Date": "",
"Release Lead": "Jk",
"Engineering Lead": "Ly",
"Test Lead": "FD"
}
]
}
]
}
请帮助我解决这个问题。我是第一次做这类工作。
提前致谢
最佳答案
我的建议是使用回收站视图而不是可扩展列表视图，因为在大数据可扩展列表视图的情况下会产生问题，尤其是在三级可扩展列表视图的情况下。
并为列表的每个级别创建一个模型类，这些模型类具有用于复选框单击的布尔值。
关于android - 如何在Android中通过JSON创建三级可扩展 ListView ？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45748611/