ExpandableLists

2016/2/1 10:16:27

1. Custom Adapter

实现

    public class Expandable1 extends ExpandableListActivity {private MyExpandableListAdapter mAdapter;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);mAdapter = new MyExpandableListAdapter();setListAdapter(mAdapter);//   registerForContextMenu(getExpandableListView());}/*** 监听条目选择事件* @param parent* @param v* @param groupPosition* @param childPosition* @param id* @return*/@Overridepublic boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {Toast.makeText(this,groupPosition+";"+childPosition,Toast.LENGTH_SHORT).show();return super.onChildClick(parent, v, groupPosition, childPosition, id);}public class MyExpandableListAdapter extends BaseExpandableListAdapter {// Sample data set.  children[i] contains the children (String[]) for groups[i].private String[] groups = { "People Names", "Dog Names", "Cat Names", "Fish Names" };private String[][] children = {{ "Arnold", "Barry", "Chuck", "David" },{ "Ace", "Bandit", "Cha-Cha", "Deuce" },{ "Fluffy", "Snuggles" },{ "Goldy", "Bubbles" }};/*** Group数量* @return*/@Overridepublic int getGroupCount() {return groups.length;}/*** 子条目数量* @param groupPosition* @return*/@Overridepublic int getChildrenCount(int groupPosition) {return children[groupPosition].length;}/*** Group条目* @param groupPosition* @return*/@Overridepublic Object getGroup(int groupPosition) {return groups[groupPosition];}/*** 获取子条目* @param groupPosition* @param childPosition* @return*/@Overridepublic Object getChild(int groupPosition, int childPosition) {return children[groupPosition][childPosition];}@Overridepublic long getGroupId(int groupPosition) {return groupPosition;}@Overridepublic long getChildId(int groupPosition, int childPosition) {return childPosition;}@Overridepublic boolean hasStableIds() {return true;}/*** Group条目视图* @param groupPosition* @param isExpanded* @param convertView* @param parent* @return*/@Overridepublic View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {TextView textView = getGenericView();textView.setText(getGroup(groupPosition).toString());return textView;}/*** 子条目视图* @param groupPosition* @param childPosition* @param isLastChild* @param convertView* @param parent* @return*/@Overridepublic View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {TextView textView = getGenericView();textView.setText(getChild(groupPosition, childPosition).toString());return textView;}@Overridepublic boolean isChildSelectable(int groupPosition, int childPosition) {return true;}public TextView getGenericView() {// Layout parameters for the ExpandableListViewAbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 64);TextView textView = new TextView(Expandable1.this);textView.setLayoutParams(lp);// Center the text verticallytextView.setGravity(Gravity.CENTER_VERTICAL);// Set the text starting positiontextView.setPaddingRelative(36, 0, 0, 0);// Set the text alignmenttextView.setTextAlignment(View.TEXT_ALIGNMENT_VIEW_START);return textView;}}}

效果

2. Cursor

实现

    /*** Demonstrates expandable lists backed by Cursors*/public class ExpandableList2 extends ExpandableListActivity {private static final String[] CONTACTS_PROJECTION = new String[] {Contacts._ID,Contacts.DISPLAY_NAME};private static final int GROUP_ID_COLUMN_INDEX = 0;private static final String[] PHONE_NUMBER_PROJECTION = new String[] {Phone._ID,Phone.NUMBER};private static final int TOKEN_GROUP = 0;private static final int TOKEN_CHILD = 1;private static final class QueryHandler extends AsyncQueryHandler {private CursorTreeAdapter mAdapter;public QueryHandler(Context context, CursorTreeAdapter adapter) {super(context.getContentResolver());this.mAdapter = adapter;}@Overrideprotected void onQueryComplete(int token, Object cookie, Cursor cursor) {switch (token) {case TOKEN_GROUP:mAdapter.setGroupCursor(cursor);break;case TOKEN_CHILD:int groupPosition = (Integer) cookie;mAdapter.setChildrenCursor(groupPosition, cursor);break;}}}public class MyExpandableListAdapter extends SimpleCursorTreeAdapter {// Note that the constructor does not take a Cursor. This is done to avoid querying the // database on the main thread.public MyExpandableListAdapter(Context context, int groupLayout,int childLayout, String[] groupFrom, int[] groupTo, String[] childrenFrom,int[] childrenTo) {super(context, null, groupLayout, groupFrom, groupTo, childLayout, childrenFrom,childrenTo);}@Overrideprotected Cursor getChildrenCursor(Cursor groupCursor) {// Given the group, we return a cursor for all the children within that group // Return a cursor that points to this contact's phone numbersUri.Builder builder = Contacts.CONTENT_URI.buildUpon();ContentUris.appendId(builder, groupCursor.getLong(GROUP_ID_COLUMN_INDEX));builder.appendEncodedPath(Contacts.Data.CONTENT_DIRECTORY);Uri phoneNumbersUri = builder.build();mQueryHandler.startQuery(TOKEN_CHILD, groupCursor.getPosition(), phoneNumbersUri, PHONE_NUMBER_PROJECTION, Phone.MIMETYPE + "=?", new String[] { Phone.CONTENT_ITEM_TYPE }, null);return null;}}private QueryHandler mQueryHandler;private CursorTreeAdapter mAdapter;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// Set up our adaptermAdapter = new MyExpandableListAdapter(this,android.R.layout.simple_expandable_list_item_1,android.R.layout.simple_expandable_list_item_1,new String[] { Contacts.DISPLAY_NAME }, // Name for group layoutsnew int[] { android.R.id.text1 },new String[] { Phone.NUMBER }, // Number for child layoutsnew int[] { android.R.id.text1 });setListAdapter(mAdapter);mQueryHandler = new QueryHandler(this, mAdapter);// Query for peoplemQueryHandler.startQuery(TOKEN_GROUP, null, Contacts.CONTENT_URI, CONTACTS_PROJECTION, Contacts.HAS_PHONE_NUMBER + "=1", null, null);}@Overrideprotected void onDestroy() {super.onDestroy();// Null out the group cursor. This will cause the group cursor and all of the child cursors// to be closed.mAdapter.changeCursor(null);mAdapter = null;}}

效果

3. Simple Adapter

实现

/*** Demonstrates expandable lists backed by a Simple Map-based adapter*/public class ExpandableList3 extends ExpandableListActivity {private static final String NAME = "NAME";private static final String IS_EVEN = "IS_EVEN";private ExpandableListAdapter mAdapter;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);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 < 20; i++) {Map<String, String> curGroupMap = new HashMap<String, String>();groupData.add(curGroupMap);curGroupMap.put(NAME, "Group " + i);curGroupMap.put(IS_EVEN, (i % 2 == 0) ? "This group is even" : "This group is odd");List<Map<String, String>> children = new ArrayList<Map<String, String>>();for (int j = 0; j < 15; j++) {Map<String, String> curChildMap = new HashMap<String, String>();children.add(curChildMap);curChildMap.put(NAME, "Child " + j);curChildMap.put(IS_EVEN, (j % 2 == 0) ? "This child is even" : "This child is odd");}childData.add(children);}// Set up our adaptermAdapter = new SimpleExpandableListAdapter(this,groupData,android.R.layout.simple_expandable_list_item_1,new String[] { NAME, IS_EVEN },new int[] { android.R.id.text1, android.R.id.text2 },childData,android.R.layout.simple_expandable_list_item_2,new String[] { NAME, IS_EVEN },new int[] { android.R.id.text1, android.R.id.text2 });setListAdapter(mAdapter);}}

效果

View之ExpandableLists相关推荐

view(*args)改变张量的大小和形状_pytorch reshape numpy
20201227 这个方法是在不改变数据内容的情况下,改变一个数组的格式,参数及返回值,官网介绍: a:数组–需要处理的数据 newshape:新的格式–整数或整数数组,如(2,3)表示2行3列,新的 ...
View的Touch事件分发(二.源码分析)
Android中Touch事件的分发又分为View和ViewGroup的事件分发,先来看简单的View的touch事件分发. 主要分析View的dispatchTouchEvent()方法和onTou ...
View的Touch事件分发(一.初步了解)
Android中Touch事件的分发又分为View和ViewGroup的事件分发,先来看简单的View的touch事件分发. 一次完整的Touch事件序列为: ACTION_DOWN -> AC ...
View绘制流程的入口
View绘制流程的入口是WindowManager.add(decor, l),从Activity的创建开始分析,具体流程如下: Activity.onCreate() setContentView( ...
Android中View如何刷新
View的更新方式主要有以下3种: 1.不使用多线程和双缓冲这种情况最简单,在View发生改变时对UI进行重绘.你只需要Activity中显式调用View对象中的invalidate()方法即可,系 ...
Android自定义View基本步骤
一.自定义属性 1.在res下的values下面新建attrs.xml 2.在布局中使用,声明命名空间 3.在自定义View构造方法中通过TypedArray获取属性 4.必须回收 array.rec ...
Android自定义View —— TypedArray
在上一篇中Android 自定义View Canvas -- Bitmap写到了TypedArray 这个属性下面也简单的说一下TypedArray的使用 TypedArray 的作用: 用于从该结 ...
Android 自定义View Canvas —— Bitmap
Bitmap 绘制图片常用的方法有一下几种 (1) drawBitmap(@NonNull Bitmap bitmap, float left, float top, @Nullable Paint ...
Android 自定义 —— View lineTo 与 rLineTo 的区别
lineTo 的作用: 从最后一点到指定点(x,y)添加一条直线(这里大家要了解view坐标系左上角0.0 开始的) 它的特点是:绘制一条道(x,y)的一条直线 ,如果没有对此轮廓执行moveTo() ...
Android 自定义View —— Canvas
上一篇在android 自定义view Paint 里面说了几种常见的Point 属性绘制图形的时候下面总有一个canvas ,Canvas 是是画布上面可以绘制点,线,正方形,圆,等等,需要和 ...

View之ExpandableLists

ExpandableLists

1. Custom Adapter

实现

效果

2. Cursor

实现

效果

3. Simple Adapter

实现

效果

View之ExpandableLists相关推荐

最新文章

热门文章