A small example of android's support for group and contact display

A small example of android's support for group and contact display

First look:

To achieve this effect, the activity must implement ExpandableListActivity.

@ Overridepublic void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); requestWindowFeature (Window. FEATURE_NO_TITLE); setContentView (R. layout. main); mContactListView = getExpandableListView (); mContactListView. setBackgroundResource (R. drawable. default_bg); registerForContextMenu (mContactListView); mContactDataBase = (ContactApplication) getApplication ()). getmContactDataBase (); getExpandableListView (). setCacheColorHint (0); // avoid black getExpandableListView () when dragging (). setDivider (null); // remove the black line (split line) under each item // custom drop-down icon getExpandableListView (). setGroupIndicator (getResources (). getDrawable (R. drawable. expander_ic_folder); configure () ;}/ *** set the adapter of ExpandableListView */private void setadat#expandablelistview () {Cursor groupCursor = mContactDataBase. getAllGroups (); // This is to query all Util groups from the database. d (TAG, "groupCursor =" + groupCursor); // the lifecycle of curosr will be related to activity startManagingCursor (groupCursor); // set my adapterContactTreeAdapterContactTreeAdapter = new ContactTreeAdapter (groupCursor, this, true, mContactDataBase); setListAdapter (contactTreeAdapter );}

Main Implementation ContactTreeAdapter

Public class ContactTreeAdapter extends CursorTreeAdapter {/** log tag. */private static final String TAG = "ContactTreeAdapter";/** context */public Context mContext = null; private Cursor mCursor = null; private ContactDataBase mContactDataBase; // contact table field index private static final int INDEX_NAME = 1; private static final int INDEX_PHONENUMBER = 2; // group table field index private static final int INDEX_GROUPNAME = 1; public ContactTreeAdapter (Cursor cursor, Context context, boolean autoRequery, ContactDataBase contactDataBase) {super (cursor, context, autoRequery); mContext = context; this. mContactDataBase = contactDataBase; // TODO Auto-generated constructor stub} @ Overrideprotected Cursor getChildrenCursor (Cursor groupCursor) {// TODO Auto-generated method stubString groupName = groupCursor. getString (INDEX_GROUPNAME); // obtain the current group name Cursor childCursor = mContactDataBase. getContactsByGroupName (groupName); return childCursor;} @ Overrideprotected View newGroupView (Context context, Cursor cursor, boolean isExpanded, ViewGroup parent) {// TODO Auto-generated method stubUtil. d (TAG, "newGroupView"); LayoutInflater inflate = LayoutInflater. from (mContext); View view = inflate. inflate (R. layout. grouplayout, null); bindGroupView (view, context, cursor, isExpanded); return view ;}@ Overrideprotected void bindGroupView (View view, Context context, Cursor cursor, boolean isExpanded) {// TODO Auto-generated method stubUtil. d (TAG, "bindGroupView"); TextView groupName = (TextView) view. findViewById (R. id. groupName); String group = cursor. getString (INDEX_GROUPNAME); groupName. setText (group); TextView groupCount = (TextView) view. findViewById (R. id. groupCount); int count = mContactDataBase. getCountContactByGroupName (group); Util. d (TAG, "count =" + count + "group =" + group); groupCount. setText ("[" + count + "]") ;}@ Overrideprotected View newChildView (Context context, Cursor cursor, boolean isLastChild, ViewGroup parent) {// TODO Auto-generated method stubUtil. d (TAG, "newChildView"); LayoutInflater inflate = LayoutInflater. from (mContext); View view = inflate. inflate (R. layout. childlayout, null); bindChildView (view, context, cursor, isLastChild); return view ;}@ Overrideprotected void bindChildView (View view, Context context, Cursor cursor, boolean isLastChild) {// TODO Auto-generated method stubUtil. d (TAG, "bindChildView cursor. getString (INDEX_PHONENUMBER) = "+ cursor. getString (INDEX_PHONENUMBER); TextView name = (TextView) view. findViewById (R. id. name); name. setText (cursor. getString (INDEX_NAME); TextView description = (TextView) view. findViewById (R. id. description); description. setTextKeepState (cursor. getString (INDEX_PHONENUMBER ));}}

This is because the function name of this adapter can tell what it is, and I will not explain it one by one.