Java Android ExpandableListView不是'；在应用程序中不可见
我正试图在Android中制作一个Java Android ExpandableListView不是'；在应用程序中不可见,java,android,xml,exp,Java,Android,Xml,Exp,我正试图在Android中制作一个ExpandableListView，其中显示了一系列问题。当我运行应用程序时，屏幕上不会显示任何内容。我不知道这是为什么或者如何发生的。有人能帮我吗 我不想说明我从服务器获取数据，这些数据保存在对象中（也称为问题）。我已经测试了很多次，这段代码没有任何问题。因此，要显示的数据可用，但不会显示在应用程序中 我正在使用以下代码： 占位符片段： public static class PlaceholderFragment extends Fragment {
ExpandableListViewpublic static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
// Progress dialog
private ProgressDialog pDialog;
private static String TAG = Problems.class.getSimpleName();
private ArrayList<Problem> myProblems = new ArrayList<Problem>();
private SparseArray<Group> groups = new SparseArray<Group>();
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//Here comes code that handles data input from server ( which correctly works btw )
for(int i = 0; i < myProblems.size(); i++){
Group group = new Group(myProblems.get(i).getTitle());
group.children.add(myProblems.get(i).domainsToString());
group.children.add(myProblems.get(i).getDescription());
groups.append(i, group);
}
View rootView = inflater.inflate(R.layout.fragment_my_problems, container, false);
mMyProblems = (ExpandableListView) rootView.findViewById(R.id.my_problems);
//mMyProblems.setAdapter(adapterMyP);
MyProblemExpandableListViewAdapter adapter = new MyProblemExpandableListViewAdapter(this.getActivity(), groups);
mMyProblems.setAdapter(adapter);
return rootView;
}
private void showpDialog() {
if (!pDialog.isShowing())
pDialog.show();
}
private void hidepDialog() {
if (pDialog.isShowing())
pDialog.dismiss();
}
}
public class MyProblemExpandableListViewAdapter extends BaseExpandableListAdapter {
private final SparseArray<Group> groups;
public LayoutInflater inflater;
public Activity activity;
public MyProblemExpandableListViewAdapter(Activity act, SparseArray<Group> groups) {
activity = act;
this.groups = groups;
inflater = act.getLayoutInflater();
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return groups.get(groupPosition).children.get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return 0;
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String children = (String) getChild(groupPosition, childPosition);
TextView text = null;
if (convertView == null) {
convertView = inflater.inflate(R.layout.listrow_details, null);
}
text = (TextView) convertView.findViewById(R.id.textView1);
text.setText(children);
convertView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(activity, children,
Toast.LENGTH_SHORT).show();
}
});
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return groups.get(groupPosition).children.size();
}
@Override
public Object getGroup(int groupPosition) {
return groups.get(groupPosition);
}
@Override
public int getGroupCount() {
return groups.size();
}
@Override
public void onGroupCollapsed(int groupPosition) {
super.onGroupCollapsed(groupPosition);
}
@Override
public void onGroupExpanded(int groupPosition) {
super.onGroupExpanded(groupPosition);
}
@Override
public long getGroupId(int groupPosition) {
return 0;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = inflater.inflate(R.layout.listrow_group, null);
}
Group group = (Group) getGroup(groupPosition);
((CheckedTextView) convertView).setText(group.string);
((CheckedTextView) convertView).setChecked(isExpanded);
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return false;
}
}
public class Group {
public String string;
public final List<String> children = new ArrayList<String>();
public Group(String string) {
this.string = string;
}
}
公共静态类占位符片段扩展片段{
/**
*表示此文件节号的片段参数
*碎片。
*/
私有静态最终字符串ARG\u SECTION\u NUMBER=“SECTION\u NUMBER”；
//进度对话框
私人对话；
私有静态字符串标记=Problems.class.getSimpleName（）；
private ArrayList myProblems=new ArrayList（）；
私有SparseArray组=新SparseArray（）；
/**
*返回给定节的此片段的新实例
*号码。
*/
公共静态占位符片段newInstance（int sectionNumber）{
占位符片段=新占位符片段（）；
Bundle args=新Bundle（）；
参数Putin（参数段号，段号）；
fragment.setArguments（args）；
返回片段；
}
公共占位符片段（）{
}
@凌驾
创建视图上的公共视图（布局、充气机、视图组容器、，
Bundle savedInstanceState）{
//下面是处理来自服务器的数据输入的代码（顺便说一句，它可以正常工作）
对于（int i=0；ipublic static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
// Progress dialog
private ProgressDialog pDialog;
private static String TAG = Problems.class.getSimpleName();
private ArrayList<Problem> myProblems = new ArrayList<Problem>();
private SparseArray<Group> groups = new SparseArray<Group>();
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//Here comes code that handles data input from server ( which correctly works btw )
for(int i = 0; i < myProblems.size(); i++){
Group group = new Group(myProblems.get(i).getTitle());
group.children.add(myProblems.get(i).domainsToString());
group.children.add(myProblems.get(i).getDescription());
groups.append(i, group);
}
View rootView = inflater.inflate(R.layout.fragment_my_problems, container, false);
mMyProblems = (ExpandableListView) rootView.findViewById(R.id.my_problems);
//mMyProblems.setAdapter(adapterMyP);
MyProblemExpandableListViewAdapter adapter = new MyProblemExpandableListViewAdapter(this.getActivity(), groups);
mMyProblems.setAdapter(adapter);
return rootView;
}
private void showpDialog() {
if (!pDialog.isShowing())
pDialog.show();
}
private void hidepDialog() {
if (pDialog.isShowing())
pDialog.dismiss();
}
}
public class MyProblemExpandableListViewAdapter extends BaseExpandableListAdapter {
private final SparseArray<Group> groups;
public LayoutInflater inflater;
public Activity activity;
public MyProblemExpandableListViewAdapter(Activity act, SparseArray<Group> groups) {
activity = act;
this.groups = groups;
inflater = act.getLayoutInflater();
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return groups.get(groupPosition).children.get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return 0;
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String children = (String) getChild(groupPosition, childPosition);
TextView text = null;
if (convertView == null) {
convertView = inflater.inflate(R.layout.listrow_details, null);
}
text = (TextView) convertView.findViewById(R.id.textView1);
text.setText(children);
convertView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(activity, children,
Toast.LENGTH_SHORT).show();
}
});
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return groups.get(groupPosition).children.size();
}
@Override
public Object getGroup(int groupPosition) {
return groups.get(groupPosition);
}
@Override
public int getGroupCount() {
return groups.size();
}
@Override
public void onGroupCollapsed(int groupPosition) {
super.onGroupCollapsed(groupPosition);
}
@Override
public void onGroupExpanded(int groupPosition) {
super.onGroupExpanded(groupPosition);
}
@Override
public long getGroupId(int groupPosition) {
return 0;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = inflater.inflate(R.layout.listrow_group, null);
}
Group group = (Group) getGroup(groupPosition);
((CheckedTextView) convertView).setText(group.string);
((CheckedTextView) convertView).setChecked(isExpanded);
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return false;
}
}
public class Group {
public String string;
public final List<String> children = new ArrayList<String>();
public Group(String string) {
this.string = string;
}
}
公共类MyProblemExpandableListViewAdapter扩展了BaseExpandableListAdapter{
私人最终Sparsarray集团；
公共场所；充气机；
公共活动；
公共MyProblemExpandableListViewAdapter（活动法案，SparseArray组）{
活动=行动；
这个组=组；
充气器=act.getLayoutFlater（）；
}
@凌驾
公共对象getChild（int-groupPosition，int-childPosition）{
返回groups.get（groupPosition）.children.get（childPosition）；
}
@凌驾
公共长getChildId（int-groupPosition，int-childPosition）{
返回0；
}
@凌驾
公共视图getChildView（int groupPosition，final int childPosition，
布尔值isLastChild、视图转换视图、视图组父级）{
最终字符串children=（String）getChild（groupPosition，childPosition）；
TextView text=null；
if（convertView==null）{
convertView=充气机。充气（R.layout.listrow\u详细信息，空）；
}
text=（TextView）convertView.findViewById（R.id.textView1）；
text.setText（儿童）；
convertView.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
Toast.makeText（活动、儿童、，
吐司。长度（短）。show（）；
}
});
返回视图；
}
@凌驾
公共整数getChildrenCount（整数组位置）{
返回groups.get（groupPosition.children.size（）；
}
@凌驾
公共对象getGroup（int-groupPosition）{
返回groups.get（groupPosition）；
}
@凌驾
public int getGroupCount（）{
返回组。size（）；
}
@凌驾
公共void-ongroupposition（int-groupPosition）{
super.ongroupposition（groupPosition）；
}
@凌驾
已扩展的公共组（int-groupPosition）{
super.onGroupExpanded（groupPosition）；
}
@凌驾
公共长getGroupId（int-groupPosition）{
返回0；
}
@凌驾
公共视图getGroupView（int-groupPosition，布尔值isExpanded，
视图（视图、视图组父级）{
if（convertView==null）{
convertView=充气机。充气（R.layout.listrow_组，空）；
}
组组=（组）getGroup（组位置）；
（（CheckedTextView）convertView）.setText（group.string）；
（（CheckedTextView）convertView）.setChecked（isExpanded）；
返回视图；
}
@凌驾
公共布尔表ID（）{
返回false；
}
@凌驾
公共布尔值isChildSelectable（int-groupPosition，int-childPosition）{
返回false；
}
}
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
// Progress dialog
private ProgressDialog pDialog;
private static String TAG = Problems.class.getSimpleName();
private ArrayList<Problem> myProblems = new ArrayList<Problem>();
private SparseArray<Group> groups = new SparseArray<Group>();
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//Here comes code that handles data input from server ( which correctly works btw )
for(int i = 0; i < myProblems.size(); i++){
Group group = new Group(myProblems.get(i).getTitle());
group.children.add(myProblems.get(i).domainsToString());
group.children.add(myProblems.get(i).getDescription());
groups.append(i, group);
}
View rootView = inflater.inflate(R.layout.fragment_my_problems, container, false);
mMyProblems = (ExpandableListView) rootView.findViewById(R.id.my_problems);
//mMyProblems.setAdapter(adapterMyP);
MyProblemExpandableListViewAdapter adapter = new MyProblemExpandableListViewAdapter(this.getActivity(), groups);
mMyProblems.setAdapter(adapter);
return rootView;
}
private void showpDialog() {
if (!pDialog.isShowing())
pDialog.show();
}
private void hidepDialog() {
if (pDialog.isShowing())
pDialog.dismiss();
}
}
public class MyProblemExpandableListViewAdapter extends BaseExpandableListAdapter {
private final SparseArray<Group> groups;
public LayoutInflater inflater;
public Activity activity;
public MyProblemExpandableListViewAdapter(Activity act, SparseArray<Group> groups) {
activity = act;
this.groups = groups;
inflater = act.getLayoutInflater();
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return groups.get(groupPosition).children.get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return 0;
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String children = (String) getChild(groupPosition, childPosition);
TextView text = null;
if (convertView == null) {
convertView = inflater.inflate(R.layout.listrow_details, null);
}
text = (TextView) convertView.findViewById(R.id.textView1);
text.setText(children);
convertView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(activity, children,
Toast.LENGTH_SHORT).show();
}
});
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return groups.get(groupPosition).children.size();
}
@Override
public Object getGroup(int groupPosition) {
return groups.get(groupPosition);
}
@Override
public int getGroupCount() {
return groups.size();
}
@Override
public void onGroupCollapsed(int groupPosition) {
super.onGroupCollapsed(groupPosition);
}
@Override
public void onGroupExpanded(int groupPosition) {
super.onGroupExpanded(groupPosition);
}
@Override
public long getGroupId(int groupPosition) {
return 0;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = inflater.inflate(R.layout.listrow_group, null);
}
Group group = (Group) getGroup(groupPosition);
((CheckedTextView) convertView).setText(group.string);
((CheckedTextView) convertView).setChecked(isExpanded);
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return false;
}
}
public class Group {
public String string;
public final List<String> children = new ArrayList<String>();
public Group(String string) {
this.string = string;
}
}
公共类组{
公共字符串；
public final List children=new ArrayList（）；
公共组（字符串）{
this.string=string；
}
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.wsi.wesupportit.Problems$PlaceholderFragment" >
<ExpandableListView
android:id="@+id/my_problems"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ExpandableListView>
</LinearLayout>
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="?android:attr/listPreferredItemHeight"
android:layout_marginLeft="8dp"
android:gravity="left"
android:paddingLeft="32dp"
android:paddingTop="8dp"
android:text="Test"
android:textSize="14sp"
android:textStyle="bold" />
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="40dp"
android:clickable="true"android:orientation="vertical"
android:paddingLeft="40dp">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawablePadding="5dp"
android:gravity="center_vertical"
android:text="@string/hello_world"
android:textSize="14sp"
android:textStyle="bold" >
</TextView>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@android:color/black" />
</LinearLayout>