ExpandableListView 学习

╰+哭是因爲堅強的太久メ 2022-08-27 05:59 148阅读 0赞

主要是记住  BaseExpandableListAdapter  中的一些方法，然后就是注意数据的封装就可以了。和ListView都一样，差不多模式。  代码如下：

public class TestExpandableListView extends Activity \{

private ExpandableListView expandListView;

private String\[\] groupStr = new String\[\] \{ "热火", "凯尔特人", "全明星" \};

private String\[\]\[\] childStr = new String\[\]\[\] \{ \{ "詹姆斯", "韦德", "波什" \},

\{ "加内特", "皮尔斯", "隆多" \}, \{ "科比", "雷阿伦", "安东尼" \} \};

private ImageView  ivGroupIcon;

protected void onCreate(Bundle savedInstanceState) \{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

expandListView = (ExpandableListView) findViewById(R.id.expand\_list\_view);

ExpandListAdapter adapter = new ExpandListAdapter(this, groupStr,childStr);

expandListView.setAdapter(adapter);

expandListView.setGroupIndicator(null); // 默认图标去掉

// 默认展开第几组

//expandListView.expandGroup(0);

expandListView.setSelectedGroup(0) ;//设置选择指定的组。

expandListView.setSelectedChild(0, 0, true);//设置选择指定的子项。

expandListView.getPackedPositionGroup (0);//返回所选择的组

expandListView.getPackedPositionForChild(0, 0) ;//返回所选择的子项

expandListView.getPackedPositionType(0);//返回所选择项的类型（Child,Group）

expandListView.isGroupExpanded (0);//判断此组是否展开

expandListView.getPackedPositionGroup(0);

// 他是组装的，所以数据都在这里面。

adapter.getChild(0, 0);

adapter.getGroup(0);

expandListView.setOnChildClickListener(new OnChildClickListener() \{

@Override

public boolean onChildClick(ExpandableListView parent, View v, int groupPosition,

int childPosition, long id) \{

String msg = childStr\[groupPosition\]\[childPosition\];

Toast.makeText(getApplicationContext(), msg, Toast.LENGTH\_SHORT).show();

return false;

\});

public class ExpandListAdapter extends BaseExpandableListAdapter \{

private Context context;

private LayoutInflater inflater;

private String\[\] groupStr;

private String\[\]\[\] childStr;

public ExpandListAdapter(Context context, String\[\] groupStr,

String\[\]\[\] childStr) \{

super();

this.context = context;

this.inflater = LayoutInflater.from(context);

this.groupStr = groupStr;

this.childStr = childStr;

@Override

public int getGroupCount() \{

return groupStr.length;

@Override

public Object getGroup(int groupIndex) \{

return groupStr\[groupIndex\];

@Override

public long getGroupId(int groupIndex) \{

return groupIndex;

@Override

public int getChildrenCount(int groupIndex) \{

return childStr\[groupIndex\].length;

@Override

public long getChildId(int groupIndex, int childIndex) \{

return childIndex;

@Override

public Object getChild(int groupIndex, int childIndex) \{

return childStr\[groupIndex\]\[childIndex\];

@Override

public View getChildView(int groupIndex, int childIndex,

boolean isLastChildren, View convertView, ViewGroup parent) \{

ChildItem child = null;

if (convertView == null) \{

child = new ChildItem();

convertView = inflater.inflate(R.layout.expand\_list\_child, null);

child.childTv = (TextView) convertView.findViewById(R.id.tv\_child\_name);

convertView.setTag(child);

\} else \{

child = (ChildItem) convertView.getTag();

child.childTv.setText(getChild(groupIndex, childIndex).toString());

return convertView;

@Override

public View getGroupView(int groupIndex, boolean arg1, View convertView,

ViewGroup arg3) \{

final int index = groupIndex;

System.out.println(arg1+"=================="); // 判断是展开还是关闭

GroupItem group = null;

if (convertView == null) \{

group = new GroupItem();

convertView = inflater.inflate(R.layout.expand\_list\_group, null);

group.groupTv = (TextView) convertView.findViewById(R.id.tv\_groud\_name);

group.iconView = (ImageView)convertView.findViewById(R.id.iv\_group\_icon);

convertView.setTag(group);

\} else \{

group = (GroupItem) convertView.getTag();

group.groupTv.setText(groupStr\[groupIndex\]);

if(arg1)\{

group.iconView.setImageDrawable(context.getResources().getDrawable(R.drawable.ic\_launcher));

\}else\{

group.iconView.setImageDrawable(context.getResources().getDrawable(R.drawable.icon));

return convertView;

@Override

public boolean hasStableIds() \{

return true;

// 想触发子类的话，必须要返回true

@Override

public boolean isChildSelectable(int arg0, int arg1) \{

return true;

public class GroupItem \{

private TextView groupTv;

private ImageView iconView;

public class ChildItem \{

private TextView childTv;

ExpandableListView 学习

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