ListView的加强版ExpandListableListView
1.效果图
2.代码
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↳ | android.view.ViewGroup | ||||
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↳ | android.widget.AdapterView<android.widget.ListAdapter> | |||
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↳ | android.widget.AbsListView | ||
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↳ | android.widget.ListView | |
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↳ | android.widget.ExpandableListView |
package com.example.test;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.Toast;
/**
* last-modified :下午4:23:21
* @author jack chen
*/
public class MainActivity extends Activity {
private ExpandableListView expandList;
private String[][] data = new String[][]{{"title1","close"},{"title1","close"},{"title1","close"}};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
expandList = (ExpandableListView) findViewById(android.R.id.list);
expandList.setAdapter(new ExpandListAdapter(MainActivity.this,data,expandList));
expandList.setGroupIndicator(null); //more comfortable
expandList.setOnGroupClickListener(new OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
Toast.makeText(MainActivity.this, "Group position:"+groupPosition, 2000).show(); //unused_code
return true;
}
});
expandList.setOnChildClickListener(new OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
Toast.makeText(MainActivity.this, "Child position:"+childPosition, 2000).show();
return true;
}
});
//open all
for(int i=0;i<data.length;i++){
expandList.expandGroup(i,true);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
/**
*
*/
package com.example.test;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.Button;
import android.widget.ExpandableListView;
import android.widget.TextView;
/**
* last-modified :下午4:23:21
* @author jack chen
*/
public class ExpandListAdapter extends BaseExpandableListAdapter {
private Context context;
private LayoutInflater layoutInflater; //inflate layout
private ExpandableListView expandListView;
private String[][] data;
public ExpandListAdapter(Context context,String[][] data,ExpandableListView expandListView){
this.data = data;
layoutInflater = LayoutInflater.from(context);
this.expandListView = expandListView;
}
@Override
public int getGroupCount() {
return data.length;
}
@Override
public int getChildrenCount(int groupPosition) {
return data[groupPosition].length;
}
@Override
public Object getGroup(int groupPosition) {
return data[groupPosition];
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return data[groupPosition][childPosition];
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public View getGroupView(final int groupPosition, final boolean isExpanded, View convertView, ViewGroup parent) {
final GroupHolder holder;
if(convertView == null){
holder = new GroupHolder();
convertView = layoutInflater.inflate(R.layout.group_item, null);
holder.title = (TextView) convertView.findViewById(R.id.group_item_title);
holder.close = (Button) convertView.findViewById(R.id.group_item_close);
convertView.setTag(holder);
}else{
holder = (GroupHolder) convertView.getTag();
}
String[] groupStrs = data[groupPosition];
holder.title.setText(groupStrs[0]);
holder.close.setText(groupStrs[1]);
// holder.close.setVisibility(View.GONE);
holder.close.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(isExpanded){
expandListView.collapseGroup(groupPosition);
}else{
expandListView.expandGroup(groupPosition,true);
}
}
});
return convertView;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView,
ViewGroup parent) {
final ChildHolder holder;
if(convertView == null){
convertView = layoutInflater.inflate(R.layout.child_item, null);
holder = new ChildHolder();
holder.title = (TextView) convertView.findViewById(R.id.child_item_title);
convertView.setTag(holder);
}else{
holder = (ChildHolder) convertView.getTag();
}
String childrenStr = data[groupPosition][childPosition];
holder.title.setText(childrenStr);
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
private class GroupHolder{
TextView title;
Button close;
}
private class ChildHolder{
TextView title;
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/groupItem"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/group_item_title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:gravity="center"
android:text="hello"
android:textSize="18sp"
android:layout_weight="1"/>
<Button
android:id="@+id/group_item_close"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="world"
android:layout_weight="1"/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/groupItem"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/child_item_title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:gravity="center"
android:text="hello"
android:textSize="18sp"
android:layout_weight="1"/>
</LinearLayout>
Group因为布局中有了按钮，所以点击Group事件会被子控件监听事件阻挡从而不会被触发，设置按钮为View.GONE即可。看起来和ListView差不多。刚刚看起来觉得很难，后来稍微研究下觉得也没什么了。
之后在使用的时候发现Group布局加载7次，搞不懂，后来才发现listView的布局文件的高度设置为wrap_content,so,会不断的去重新计算，重新的布局。stackflower
if (oldBean.getStatus() == Constant.STATUS_ORDERITEM_CANCELITEM) {
String remark = oldBean.getRemark();
if (TextUtils.isEmpty(remark)) {
remark = resources.getString(R.string.lbVoid);
} else {
remark += resources.getString(R.string.lbVoid);
}
holder.valRemark.setText(remark);
holder.valRemark.setVisibility(View.VISIBLE);
} else {
holder.valRemark.setVisibility(View.GONE);
}
加载次数过多需要谨慎，特别是Visible和Gone这种。小错误，找半天。
遇到的问题:
--- http://blog.csdn.net/jesse_boy/article/details/41912097
我是菜鸟，我在路上。