ExpandableListView小图标替换
ExpandableListView的小图标有个状态，一个是不点击的情况，一个是点击后展开的情况，用xml配置如下：
<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_expanded="true" android:drawable="@drawable/narrow_select" /> <item android:drawable="@drawable/narrow" /></selector>
ExpandableListView listView = getExpandableListView();listView.setGroupIndicator(this.getResources().getDrawable(R.drawable.group_icon_selector));
private boolean[] isOpen=new boolean[groups.length];
expandableListView.setOnGroupCollapseListener(onGroupCollapseListener);expandableListView.setOnGroupExpandListener(onGroupExpandListener);expandableListView.setGroupIndicator(null);//不要自带的了！！！OnGroupCollapseListener onGroupCollapseListener=new OnGroupCollapseListener(){@Overridepublic void onGroupCollapse(int groupPosition) {// TODO Auto-generated method stubisOpen[groupPosition]=false;}};OnGroupExpandListener onGroupExpandListener=new OnGroupExpandListener(){@Overridepublic void onGroupExpand(int groupPosition) {// TODO Auto-generated method stubisOpen[groupPosition]=true;}};@Overridepublic View getGroupView(int groupPosition, boolean isExpanded,View convertView, ViewGroup parent) {// TODO Auto-generated method stubTextView textView=null;if(convertView==null){textView=new TextView(mContext);AbsListView.LayoutParams lp = new AbsListView.LayoutParams( ViewGroup.LayoutParams.FILL_PARENT, 50); textView.setLayoutParams(lp); textView.setGravity(Gravity.CENTER); textView.setPadding(10, 0, 0, 0); textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 16.0f); textView.setTextColor(0xFFC6B39C); textView.setBackgroundResource(R.drawable.bg_tv);//bg_tv_expand convertView=textView;}else{textView=(TextView)convertView;}//为了处理图标被拉伸的问题！这里采用偷懒的办法让textView傍边产生一个图标，如果GroupView只是一个TextView的话，推荐这样做！if(isOpen[groupPosition]){Drawable leftDrawable= resources.getDrawable(R.drawable.arrow_down_on); leftDrawable.setBounds(0, 0, leftDrawable.getMinimumWidth(), leftDrawable.getMinimumHeight()); textView.setCompoundDrawables(leftDrawable, null, null, null);}else{Drawable leftDrawable= resources.getDrawable(R.drawable.arrow_right_off);leftDrawable.setBounds(0, 0, leftDrawable.getMinimumWidth(), leftDrawable.getMinimumHeight());textView.setCompoundDrawables(leftDrawable, null, null, null);}textView.setText(((Market)getGroup(groupPosition)).market); return textView;}
import android.app.ExpandableListActivity;import android.os.Bundle;import android.view.ContextMenu;import android.view.Gravity;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.view.ContextMenu.ContextMenuInfo;import android.widget.AbsListView;import android.widget.BaseExpandableListAdapter;import android.widget.ExpandableListAdapter;import android.widget.ExpandableListView;import android.widget.TextView;import android.widget.Toast;import android.widget.ExpandableListView.ExpandableListContextMenuInfo;import com.example.android.apis.R;/** * Demonstrates expandable lists using a custom {@link ExpandableListAdapter} * from {@link BaseExpandableListAdapter}. */public class ExpandableList1 extends ExpandableListActivity { ExpandableListAdapter mAdapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Set up our adapter mAdapter = new MyExpandableListAdapter(); setListAdapter(mAdapter); registerForContextMenu(getExpandableListView()); } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { menu.setHeaderTitle("Sample menu"); menu.add(0, 0, 0, R.string.expandable_list_sample_action); } @Override public boolean onContextItemSelected(MenuItem item) { ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo(); String title = ((TextView) info.targetView).getText().toString(); int type = ExpandableListView.getPackedPositionType(info.packedPosition); if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) { int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition); int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition); Toast.makeText(this, title + ": Child " + childPos + " clicked in group " + groupPos, Toast.LENGTH_SHORT).show(); return true; } else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) { int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition); Toast.makeText(this, title + ": Group " + groupPos + " clicked", Toast.LENGTH_SHORT).show(); return true; } return false; } /** * A simple adapter which maintains an ArrayList of photo resource Ids. * Each photo is displayed as an image. This adapter supports clearing the * list of photos and adding a new photo. * */ 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" } }; public Object getChild(int groupPosition, int childPosition) { return children[groupPosition][childPosition]; } public long getChildId(int groupPosition, int childPosition) { return childPosition; } public int getChildrenCount(int groupPosition) { return children[groupPosition].length; } public TextView getGenericView() { // Layout parameters for the ExpandableListView AbsListView.LayoutParams lp = new AbsListView.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, 64); TextView textView = new TextView(ExpandableList1.this); textView.setLayoutParams(lp); // Center the text vertically textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); // Set the text starting position textView.setPadding(36, 0, 0, 0); return textView; } public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { TextView textView = getGenericView(); textView.setText(getChild(groupPosition, childPosition).toString()); return textView; } public Object getGroup(int groupPosition) { return groups[groupPosition]; } public int getGroupCount() { return groups.length; } public long getGroupId(int groupPosition) { return groupPosition; } public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { TextView textView = getGenericView(); textView.setText(getGroup(groupPosition).toString()); return textView; } public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } public boolean hasStableIds() { return true; } }}