我所拥有的只是3个单独的可扩展列表，在我的相同布局中扩展了BaseExpandableListAdapter，它正在按预期工作，但我希望默认情况下使所有可扩展列表处于展开状态，并希望防止它们崩溃。
public class MainActivity extends ActionBarActivity {
private ExpandableListView subtask_explist , assignto_explist , note_explist;
CheckBox checkBox_card ,checkBox_subtask ;
TextView card_textview;
LinearLayout linearLayout_card ;
RelativeLayout relativeLayout_card;
private android.support.v7.widget.Toolbar toolbar;
Context context;
private ArrayList<String> subtask_parent = new ArrayList<String>();
private ArrayList<String> subtask_child = new ArrayList<String>();
private ArrayList<String> assignto_parent = new ArrayList<String>();
private ArrayList<HashMap> assignto_child = new ArrayList<HashMap>();
private ArrayList<String> note_parent = new ArrayList<String>();
private ArrayList<HashMap> note_child = new ArrayList<HashMap>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = getApplicationContext();
toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowTitleEnabled(false);
subtask_explist = (ExpandableListView) findViewById(R.id.subtask_list_id);
subtask_explist.setGroupIndicator(null);
subtask_explist.setClickable(true);
assignto_explist = (ExpandableListView) findViewById(R.id.assignto_list_id);
assignto_explist.setGroupIndicator(null);
assignto_explist.setClickable(true);
note_explist = (ExpandableListView) findViewById(R.id.note_list_id);
note_explist.setGroupIndicator(null);
note_explist.setClickable(true);
/*linearLayout_card = (LinearLayout) findViewById(R.id.card_layout);*/
relativeLayout_card = (RelativeLayout) findViewById(R.id.card_layout);
checkBox_card = (CheckBox) findViewById(R.id.cb_card);
card_textview = (TextView) findViewById(R.id.card_text);
checkBox_subtask = (CheckBox) findViewById(R.id.cb_subtask);
checkBox_card.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (checkBox_card.isChecked()){
relativeLayout_card.setBackgroundColor(getResources().getColor(R.color.selected_color));
card_textview.setBackground(getResources().getDrawable(R.drawable.border_selected));
card_textview.setPadding(23, 0, 0, 0);
}
else{
relativeLayout_card.setBackgroundColor(getResources().getColor(R.color.white_color));
card_textview.setBackground(getResources().getDrawable(R.drawable.border));
card_textview.setPadding(23, 0, 0, 0);
}
}
});
setSubtaskParentData();
setSubtaskChildData();
setAssigntoParentData();
setAssigntoChildData();
setNoteParentData();
setNoteChildData();
setAdapters();
setOnclickListner();
}
private void setOnclickListner() {
subtask_explist.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
setListViewHeight(parent, groupPosition);
return false;
}
});
assignto_explist.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
setListViewHeight(parent, groupPosition);
return false;
}
});
note_explist.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
setListViewHeight(parent, groupPosition);
return false;
}
});
}
private void setAdapters() {
// Create the Adapter
SubtaskExpandableAdapter subtaskExpandableAdapter = new SubtaskExpandableAdapter(subtask_parent, subtask_child);
subtaskExpandableAdapter.setInflater((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE), this);
subtask_explist.setAdapter(subtaskExpandableAdapter);
for (int i=0; i < subtaskExpandableAdapter.getGroupCount(); i++)
subtask_explist.expandGroup(i);
AssigntoExpandableAdapter assigntoExpandableAdapter = new AssigntoExpandableAdapter(context , assignto_parent, assignto_child);
assigntoExpandableAdapter.setInflater((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE), this);
assignto_explist.setAdapter(assigntoExpandableAdapter);
NoteExpandableAdapter noteExpandableAdapter = new NoteExpandableAdapter(note_parent, note_child);
noteExpandableAdapter.setInflater((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE), this);
note_explist.setAdapter(noteExpandableAdapter);
}
private void setNoteChildData() {
HashMap<String, String> note = new HashMap<String, String>();
note.put("title","Rafi");
note.put("msg", "Secondary line text Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam massa quam.");
note_child.add(note);
note = new HashMap<String, String>();
note.put("title","Prem");
note.put("msg","Secondary line text Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam massa quam.");
note_child.add(note);
}
private void setNoteParentData() {
note_parent.add("ADD A NOTE");
}
private void setAssigntoChildData() {
HashMap<String, String> assignto_singleitem = new HashMap<String, String>();
assignto_singleitem.put("title","Rafi");
assignto_singleitem.put("image", "images");
assignto_child.add(assignto_singleitem);
assignto_singleitem = new HashMap<String, String>();
assignto_singleitem.put("title","Prem");
assignto_singleitem.put("image","images2");
assignto_child.add(assignto_singleitem);
}
private void setAssigntoParentData() {
assignto_parent.add("ASSIGN TO");
}
private void setSubtaskParentData() {
subtask_parent.add("ADD SUBTASKS");
}
private void setSubtaskChildData() {
subtask_child.add("Single line item");
subtask_child.add("Single line item");
subtask_child.add("Single line item");
}
private void setListViewHeight(ExpandableListView listView,
int group) {
ExpandableListAdapter listAdapter = (ExpandableListAdapter) listView.getExpandableListAdapter();
int totalHeight = 0;
int desiredWidth = View.MeasureSpec.makeMeasureSpec(listView.getWidth(),
View.MeasureSpec.EXACTLY);
for (int i = 0; i < listAdapter.getGroupCount(); i++) {
View groupItem = listAdapter.getGroupView(i, false, null, listView);
groupItem.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);
totalHeight += groupItem.getMeasuredHeight();
if (((listView.isGroupExpanded(i)) && (i != group))
|| ((!listView.isGroupExpanded(i)) && (i == group))) {
for (int j = 0; j < listAdapter.getChildrenCount(i); j++) {
View listItem = listAdapter.getChildView(i, j, false, null,
listView);
listItem.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);
totalHeight += listItem.getMeasuredHeight();
}
}
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
int height = totalHeight
+ (listView.getDividerHeight() * (listAdapter.getGroupCount() - 1));
if (height < 10)
height = 200;
params.height = height;
listView.setLayoutParams(params);
listView.requestLayout();
}
}
答案 0 :(得分：1)
ExpandableListView elv = (ExpandableListView) findViewById(R.id.elv_main);
elv.setAdapter(adapter);
for(int i=0; i < adapter.getGroupCount(); i++)
elv.expandGroup(i);