当我点击按钮时，我想调用另一个活动，这是Android中可扩展列表视图的子视图。当我运行活动不显示可扩展的列表视图。如何在可扩展列表视图上工作。谁能告诉我怎么做这件事?
这是我的活动代码
public class My_Project extends ExpandableListActivity
{
ExpandableListView expListView;
Button btnNewProject;
Button btn_myprojectdefinemyteam;
DBHelper databaseHelper;
SQLiteDatabase db;
ImageView imgButtonBack;
List dispDataList;
String[] array;
String[] Task_Title_Size;
String[] Task_Start_Date_Size;
String[] Task_CompletionDate_Size;
String[] Task_CompletionTime_Size;
String[] Task_Description_Size;
String[] Task_Status_Size;
String[] Task_IsActive_Size;
String[] dtrProjectNAmeSize;
public static final String Task_Title = "Task_Titles";
public static final String Task_Start_Date = "start_date";
public static final String Task_CompletionDate = "completion_date";
public static final String Task_CompletionTime = "completion_time";
public static final String Task_Description = "task_description";
public static final String Task_Status = "task_status";
public static final String Task_IsActive ="IS_Active";
private int ParentClickStatus=-1;
private int ChildClickStatus=-1;
Myexpandable_ListAdapter mAdapter;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.my_project);
imgButtonBack = (ImageView)findViewById(R.id.imagBackButton);//ImageView imgButtonBack;
imgButtonBack.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent iBack = new Intent(My_Project.this , Menu.class);
startActivity(iBack);
finish();
}
});
expListView = (ExpandableListView) findViewById(android.R.id.list);
databaseHelper = new DBHelper(getApplicationContext());
dispDataList=databaseHelper.viewMyProjectDetals();
dtrProjectNAmeSize=new String[dispDataList.size()];
System.out.println(" dtrProjectNAmeSize = " + dtrProjectNAmeSize);
if ( dispDataList.size() > 6 )
{
Task_Title_Size=(String[])dispDataList.get(0);
Task_Start_Date_Size=(String[]) dispDataList.get(1);
Task_CompletionDate_Size = (String[])dispDataList.get(2);
Task_CompletionTime_Size=(String[])dispDataList.get(3);
Task_Description_Size=(String[]) dispDataList.get(4);
Task_Status_Size = (String[])dispDataList.get(5);
Task_IsActive_Size = (String[])dispDataList.get(6);
for(int i=0;i<Task_Title_Size.length;i++)
{
System.out.println("New data :"+Task_Title_Size[i]);
}
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 < Task_Title_Size.length ; i++)
{
Map<String, String> curGroupMap = new HashMap<String, String>();
groupData.add(curGroupMap);
curGroupMap.put(Task_Title,"" +Task_Title_Size[i]);
List<Map<String, String>> children = new ArrayList<Map<String, String>>();
Map<String, String> curChildMap = new HashMap<String, String>();
children.add(curChildMap);
curChildMap.put(Task_Start_Date,"" +Task_Start_Date_Size[i]);
curChildMap.put(Task_CompletionDate,"" +Task_CompletionDate_Size[i]);
curChildMap.put(Task_CompletionTime,"" +Task_CompletionTime_Size[i]);
curChildMap.put(Task_Description,"" +Task_Description_Size[i]);
curChildMap.put(Task_Status,"" +Task_Status_Size[i]);
curChildMap.put(Task_IsActive,"" +Task_IsActive_Size[i]);
childData.add(children);
}
mAdapter =new Myexpandable_ListAdapter(
this,
groupData,
R.layout.list_group,
new String[] { Task_Title },
new int[] {R.id.lblListHeader },
childData,
R.layout.child_item,
new String[] { Task_Start_Date , Task_CompletionDate , Task_CompletionTime , Task_Description , Task_Status , Task_IsActive},
new int[] { R.id.TextView_Projectdetails , R.id.textOne , R.id.textTwo , R.id.textThree , R.id.textFour, R.id.textFive}
);
expListView.setAdapter(mAdapter);
}
expListView.setOnGroupClickListener(new OnGroupClickListener()
{
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id)
{
return false;
}
});
//editTextTaskName = (EditText)findViewById(R.id.Task_Name);
expListView.setOnGroupExpandListener(new OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
Toast.makeText(getApplicationContext(),
dtrProjectNAmeSize.length + " Expanded",
Toast.LENGTH_SHORT).show();
}
});
expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
Toast.makeText(getApplicationContext(),
dtrProjectNAmeSize.length + " Collapsed",
Toast.LENGTH_SHORT).show();
}
});
btnNewProject = (Button)findViewById(R.id.buttonmyproject_NewProject);
btnNewProject.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(My_Project.this , Add_Project.class);
startActivity(i);
finish();
}
});
}
private class Myexpandable_ListAdapter extends BaseExpandableListAdapter {
public Myexpandable_ListAdapter(Context context,
List<? extends Map<String, ?>> groupData,
int expandedGroupLayout,
String[] groupFrom, int[] groupTo,
List<? extends List<? extends Map<String, ?>>> childData,
int childLayout, String[] childFrom,
int[] childTo) {
super();
// TODO Auto-generated constructor stub
}
private Context _context;
private List<String> _listDataHeader; // header titles
// child data in format of header title, child title
private HashMap<String, List<String>> _listDataChild;
Context context;
public Object getChild(int groupPosition, int childPosition)
{
//this.get(groupPosition).getChildren().get(childPosition);
String strchildPosition = this._listDataChild.get(this._listDataHeader.get(groupPosition)).get(childPosition);
System.out.println("Child Position =" + strchildPosition);
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.get(childPosition);
}
//Call when child row clicked
@Override
public long getChildId(int groupPosition, int childPosition)
{
/****** When Child row clicked then this function call *******/
//Log.i("Noise", "parent == "+groupPosition+"= child : =="+childPosition);
if( ChildClickStatus!=childPosition)
{
ChildClickStatus = childPosition;
Toast.makeText(getApplicationContext(), "Parent :"+groupPosition + " Child :"+childPosition ,
Toast.LENGTH_LONG).show();
}
return childPosition;
}
public View getChildView1(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
return parent;
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String childText = (String) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.child_item, null);
}
TextView txtListChild = (TextView) convertView.findViewById(R.id.TextView_Projectdetails);
TextView txtOneListChild = (TextView)convertView.findViewById(R.id.textOne);
TextView txtTwoListChild = (TextView)convertView.findViewById(R.id.textTwo);
TextView txtThreeListChild = (TextView)convertView.findViewById(R.id.textThree);
TextView txtFourListChild = (TextView)convertView.findViewById(R.id.textFour);
TextView txtFiveListChild = (TextView)convertView.findViewById(R.id.textFive);
txtListChild.setText(childText);
txtOneListChild.setText(childText);
txtTwoListChild.setText(childText);
txtThreeListChild.setText(childText);
txtFourListChild.setText(childText);
txtFiveListChild.setText(childText);
Button btnAssgnTask = (Button)convertView.findViewById(R.id.button_EditedTask);
btnAssgnTask.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
Button btnViewTask = (Button)convertView.findViewById(R.id.buttonViewTask);
btnViewTask.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.size();
}
@Override
public Object getGroup(int groupPosition) {
return this._listDataHeader.get(groupPosition);
}
@Override
public int getGroupCount() {
return ParentClickStatus;
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
String headerTitle = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_group, null);
}
TextView lblListHeader = (TextView) convertView
.findViewById(R.id.lblListHeader);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setText(headerTitle);
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
}
你的问题在这里:
@Override
public int getGroupCount() {
return ParentClickStatus;
}
当您扩展BaseExpandableListAdapter, getChildrenCount和getGroupCount时，您的视图处理数和ParentClickStatus等于-1时，getGroupView从未调用
您需要返回您拥有的组行号，因此将代码更改为:
@Override
public int getGroupCount() {
return _listDataHeader.size();
}
的例子可以参见第15节。实现一个可扩展的ListView
你也需要修改你的构造函数:
public Myexpandable_ListAdapter(Context context,
List<? extends Map<String, ?>> groupData,
int expandedGroupLayout,
String[] groupFrom, int[] groupTo,
List<? extends List<? extends Map<String, ?>>> childData,
int childLayout, String[] childFrom,
int[] childTo) {
super();
// TODO Auto-generated constructor stub
}
你传递你的数据到这里，但你不设置任何本地数据，例如，你试图使用_listDataChild在getChild方法，但你没有初始化，你需要在构造函数中初始化你的数据传递到这里。