android.widget.ExpandableListView#expandGroup ( )源码实例Demo

/**
 * 
 * 点击了 Group 触发的事件 , 要根据根据当前点击 Group 的状态来
 */
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
		int groupPosition, long id) {
	if (mAdapter.getHeadViewClickStatus(groupPosition) == 0) {
		mAdapter.onHeadViewClick(groupPosition, 1);
		parent.expandGroup(groupPosition);
		parent.setSelectedGroup(groupPosition);

	} else if (mAdapter.getHeadViewClickStatus(groupPosition) == 1) {
		mAdapter.onHeadViewClick(groupPosition, 0);
		parent.collapseGroup(groupPosition);
	}

	// 返回 true 才可以弹回第一行 , 不知道为什么
	return true;

}
 

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    MyPackageInfo pack = (MyPackageInfo) getGroup(groupPosition);
    View view = this.inflater.inflate(R.layout.all_activities_group_item, null);

    TextView text = view.findViewById(android.R.id.text1);
    text.setText(pack.getName());

    ImageView icon = view.findViewById(android.R.id.icon);
    icon.setImageDrawable(pack.getIcon());

    // expand if filtered list is short enough
    if (filtered.size() < 10) {
        ExpandableListView expandableListView = (ExpandableListView) parent;
        expandableListView.expandGroup(groupPosition);
    }

    return view;
}
 

@Override protected void onCreate(@Nullable Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.results_expandablelistview);

  Gson gson = new Gson();

  LinkedHashMap<String, List<String>> groupedStatistics = gson
      .fromJson(results, new ResultsActivity.LinkedHashMapTypeToken().getType());

  // create expandable list view
  ExpandableListView expandableListView = findViewById(R.id.expandableListView);
  ExpandableListAdapter expandableListAdapter = new ExpandableListViewAdapter(this, groupedStatistics);
  expandableListView.setAdapter(expandableListAdapter);
  // expand the first group by default
  expandableListView.expandGroup(0);
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.di_layout);

    propertyGroupList = new ArrayList<DevicePropertyGroup>();

    elv_deviceInfo = (ExpandableListView) findViewById(R.id.di_elv_deviceInfo);

    collectPropertiesBuild();
    collectPropertiesBattery();
    collectPropertiesHardware();
    collectPropertiesSensors();
    collectPropertiesMeasurements();

    DevicePropertyExpandableArrayAdapter expandableArrayAdapter = new DevicePropertyExpandableArrayAdapter(getApplicationContext(), propertyGroupList);
    elv_deviceInfo.setAdapter(expandableArrayAdapter);

    for (int i = 0; i < propertyGroupList.size(); i++) {
        elv_deviceInfo.expandGroup(i, false);
    }

}
 

@Override
protected void onCreate(final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.about);

    LayoutUtils.maximizeWindow(getWindow());

    String name = getResources().getString(R.string.app_name);
    String version = "";
    try {
        final PackageInfo packageInfo = getPackageManager().getPackageInfo(getPackageName(), 0);
        version = packageInfo.versionName;
        name = getResources().getString(packageInfo.applicationInfo.labelRes);
    } catch (final NameNotFoundException e) {
        e.printStackTrace();
    }

    final TextView title = (TextView) findViewById(R.id.about_title);
    title.setText(name + (LengthUtils.isNotEmpty(version) ? " v" + version : ""));

    final ExpandableListView view = (ExpandableListView) findViewById(R.id.about_parts);
    view.setAdapter(new PartsAdapter());
    view.expandGroup(0);
}
 

public void setList(ExpandableListView listView, ArrayList<AlbumInfo> list) {
    if (list != null && listView != null) {
        this.mList.clear();
        this.mList.addAll(list);
        notifyDataSetChanged();
        for (int i = 0; i < getGroupCount(); i++) {
            listView.expandGroup(i);
        }
        listView.setGroupIndicator(null);
    }
}
 

public void setList(ExpandableListView listView, List<LTStarRankModelDetailPB> list) {
    if (list != null && listView != null) {
        this.mList.clear();
        this.mList.addAll(list);
        notifyDataSetChanged();
        for (int i = 0; i < getGroupCount(); i++) {
            listView.expandGroup(i);
        }
        listView.setGroupIndicator(null);
    }
}
 

private void restoreExpandedState(ArrayList<Long> expandedIds) {
    this.expandedIds = expandedIds;
    if (expandedIds != null) {
        ExpandableListView list = mList;
        ExpandableListAdapter adapter = mAdapter;
        if (adapter != null) {
            for (int i=0; i<adapter.getGroupCount(); i++) {
                long id = adapter.getGroupId(i);
                if (expandedIds.contains(id)) list.expandGroup(i);
            }
        }
    }
}
 

private void restoreExpandedState(ArrayList<Long> expandedIds) {
    this.expandedIds = expandedIds;
    if (expandedIds != null) {
        ExpandableListView list = mList;
        ExpandableListAdapter adapter = mAdapter;
        if (adapter != null) {
            for (int i=0; i<adapter.getGroupCount(); i++) {
                long id = adapter.getGroupId(i);
                if (expandedIds.contains(id)) list.expandGroup(i);
            }
        }
    }
}
 

private void restoreExpandedState(ArrayList<Long> expandedIds) {
    this.expandedIds = expandedIds;
    if (expandedIds != null) {
        ExpandableListView list = mList;
        ExpandableListAdapter adapter = mAdapter;
        if (adapter != null) {
            for (int i=0; i<adapter.getGroupCount(); i++) {
                long id = adapter.getGroupId(i);
                if (expandedIds.contains(id)) list.expandGroup(i);
            }
        }
    }
}
 

void update(@NonNull List<WiFiDetail> wiFiDetails, ExpandableListView expandableListView) {
    updateGroupBy();
    if (isGroupExpandable() && expandableListView != null) {
        int groupCount = expandableListView.getExpandableListAdapter().getGroupCount();
        for (int i = 0; i < groupCount; i++) {
            WiFiDetail wiFiDetail = getWiFiDetail(wiFiDetails, i);
            if (expanded.contains(getGroupExpandKey(wiFiDetail))) {
                expandableListView.expandGroup(i);
            } else {
                expandableListView.collapseGroup(i);
            }
        }
    }
}
 

@Override 
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { 
    View v = super.getGroupView(groupPosition, isExpanded, convertView, parent); 
    ExpandableListView eLV = (ExpandableListView) parent; 
    eLV.expandGroup(groupPosition); 
    return v; 
}
 

@Override 
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { 
    View v = super.getGroupView(groupPosition, isExpanded, convertView, parent); 
    ExpandableListView eLV = (ExpandableListView) parent; 
    eLV.expandGroup(groupPosition); 
    return v; 
}
 

@Override 
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { 
    View v = super.getGroupView(groupPosition, isExpanded, convertView, parent); 
    ExpandableListView eLV = (ExpandableListView) parent; 
    eLV.expandGroup(groupPosition); 
    return v; 
}
 

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
           View convertView, ViewGroup viewGroup) {
	String channelGroup = (String) getGroup(groupPosition);
	View returningView = ChannelAdapterHelper.createChannelGroupItem(
			viewGroup.getContext(), convertView, viewGroup, channelGroup);
	
	ExpandableListView listView = (ExpandableListView) viewGroup;
    listView.expandGroup(groupPosition);

	return returningView;
}
 

private void expandAll(View view) {
	ExpandableListView listView = (ExpandableListView) view.findViewById(
			R.id.channelListView);
	int count = adapter.getGroupCount();
	for (int position = 0; position < count; position++) {
		listView.expandGroup(position);
	}
}
 

/**
 * Expands all groups in an ExpandableListView
 * @param listView ExpandableListView to expand
 */
public static void expandAllGroups(ExpandableListView listView) {
    for (int i = 0; i < listView.getExpandableListAdapter().getGroupCount(); i++) {
        listView.expandGroup(i);
    }
}