经典android 88个小例子

package tjuci.edu.dl; import android.app.ExpandableListActivity; import android.content.Intent; import android.os.Bundle; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.BaseExpandableListAdapter; import android.widget.ExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.ExpandableListView.OnChildClickListener; import android.widget.LinearLayout; import android.widget.TextView; public class Second extends ExpandableListActivity { //一级分组 String[] arrTypes = {"山东","天津","湖南"}; //二级分组 String[][] arr = { {"广州","深圳","珠海","中山"} ,{"桂林","柳州","南宁","广西"} ,{"北京","河北","河南","四川"} }; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); ExpandableListAdapter ela = new BaseExpandableListAdapter() { @Override public boolean isChildSelectable(int groupPosition, int childPosition) { // TODO Auto-generated method stub return true; } @Override public boolean hasStableIds() { // TODO Auto-generated method stub return true; } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { // TODO Auto-generated method stub LinearLayout ll = new LinearLayout(Second.this); ll.setOrientation(0); TextView tv = getTextView(); tv.setText(getGroup(groupPosition).toString()); ll.addView(tv); return ll; } @Override public long getGroupId(int groupPosition) { // TODO Auto-generated method stub return groupPosition; } @Override public int getGroupCount() { // TODO Auto-generated method stub return arrTypes.length; } @Override public Object getGroup(int groupPosition) { // TODO Auto-generated method stub return arrTypes[groupPosition]; } @Override public int getChildrenCount(int groupPosition) { // TODO Auto-generated method stub return arr[groupPosition].length; } @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { // TODO Auto-generated method stub TextView tv = getTextView(); tv.setText(getChild(groupPosition, childPosition).toString()); return tv; } @Override public long getChildId(int groupPosition, int childPosition) { // TODO Auto-generated method stub return childPosition; } @Override public Object getChild(int groupPosition, int childPosition) { // TODO Auto-generated method stub return arr[groupPosition][childPosition]; } public TextView getTextView(){ AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, 64); TextView tv = new TextView(Second.this); tv.setLayoutParams(lp); tv.setGravity(Gravity.CENTER_VERTICAL|Gravity.LEFT); tv.setPadding(36, 0, 0, 0); return tv; } }; this.setListAdapter(ela); getExpandableListView().setOnChildClickListener(new OnChildClickListener() { @Override public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) { // TODO Auto-generated method stub Intent intent = getIntent(); Bundle bundle = new Bundle(); bundle.putString("city", arr[groupPosition][childPosition]); intent.putExtras(bundle); setResult(0, intent); finish(); return false; } }); } }