android expandable listview不滚动
问题描述 投票：0回答：4
我正在尝试实现可扩展列表视图。列表展开后，它不再可滚动。标题错位了。
这是我主要活动中lisltview的布局：
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_below="@+id/dashboard_scrollview">
<ExpandableListView
android:id="@+id/leaderboard_list_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:transcriptMode="alwaysScroll" />
</RelativeLayout>
点击列表视图后，它展开但无法滚动：
我想知道为什么标题和第一个元素没有出现在列表视图中。
主要内容：
public void setupLeaderboardListView(){
leaderboardDetail = ExpandableLeaderboardData.getData();
leaderboardListView.setStackFromBottom(true);
leaderboardtitle = new ArrayList<String>(leaderboardDetail.keySet());
leaderboardAdapter = new LeaderboardAdapter(this, leaderboardtitle, leaderboardDetail);
leaderboardListView.setAdapter(leaderboardAdapter);
leaderboardListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
Toast.makeText(getApplicationContext(),
leaderboardtitle.get(groupPosition) + " List Expanded.",
Toast.LENGTH_SHORT).show();
}
});
leaderboardListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
Toast.makeText(getApplicationContext(),
leaderboardtitle.get(groupPosition) + " List Collapsed.",
Toast.LENGTH_SHORT).show();
}
});
leaderboardListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
Toast.makeText(
getApplicationContext(),
leaderboardtitle.get(groupPosition)
+ " -> "
+ leaderboardDetail.get(
leaderboardtitle.get(groupPosition)).get(
childPosition), Toast.LENGTH_SHORT
).show();
return false;
}
});
}
列出数据源：
List<String> cricket = new ArrayList<String>();
cricket.add("India");
cricket.add("Pakistan");
cricket.add("Australia");
cricket.add("England");
cricket.add("South Africa");
cricket.add("India");
cricket.add("Pakistan");
cricket.add("Australia");
cricket.add("England");
cricket.add("South Africa");
我尝试为可扩展列表设置layout_height = match_parent，但它不起作用
4个回答
1
投票
投票
当你的ExpandableListView有宽度和高度的wrap_content时，就会发生这种情况。要修复，请使其与父RelativeLayout相同
<ExpandableListView
android:id="@+id/leaderboard_list_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:transcriptMode="alwaysScroll" />
1
投票
投票
首先：ListView已被弃用，它应该已经很久以前已经死了但是，我一直看到帖子！
第二步：转到recyclerView，这里有一些资源可以帮助你：1。很好的介绍：https://developer.android.com/training/material/lists-cards.html 2.我的对话框cheetSheet应用程序（类似于演示应用程序），其中一个对话框使用可扩展的recyclverview库，试一试https://github.com/WithoutCaps/DialogsCheatSheet
0
投票
投票
使用此代码，它工作正常。这是主要的活动布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ExpandableListView
android:id="@+id/expandable_listview"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ExpandableListView>
</LinearLayout>
您的父项布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tv_parent_item"
android:layout_marginLeft="10dp"
android:layout_gravity="center_vertical"
android:textSize="20sp"
/>
</LinearLayout>
您的子项目布局：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
>
<ImageView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:id="@+id/iv_child_item"
android:background="@drawable/ic_launcher"
/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginLeft="100dp"
android:layout_marginTop="5dp" >
<TextView
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tv_child_item1"
android:layout_marginLeft="10dp"
android:textSize="15sp"
android:text="Test"
/>
<TextView
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/tv_child_item2"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:textSize="15sp"
android:text="Test"
/>
</LinearLayout>
自定义适配器类：
import java.util.HashMap;
import java.util.List;
import com.example.expandablelistview.R;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.listener.SimpleImageLoadingListener;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.TextView;
public class ExpandableAdapter extends BaseExpandableListAdapter{
private Context context;
private List<String> parentList;
private HashMap<String , List<Songs>> childList;
ImageLoader imageLoader = ImageLoader.getInstance();
DisplayImageOptions options;
public ExpandableAdapter(){
}
public ExpandableAdapter(Context context,List<String> parentList,
HashMap<String,List<Songs>> childList)
{
this.context=context;
this.parentList=parentList;
this.childList=childList;
options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.ic_launcher)
.showImageForEmptyUri(R.drawable.ic_launcher)
.showImageOnFail(R.drawable.ic_launcher)
.cacheInMemory(true)
.cacheOnDisk(true)
.considerExifParams(true)
.bitmapConfig(Bitmap.Config.RGB_565)
.build();
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context)
.defaultDisplayImageOptions(options)
.build();
imageLoader.getInstance().init(config);
}
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return this.parentList.size();
}
@Override
public int getChildrenCount(int groupPosition) {
// TODO Auto-generated method stub
return this.childList.get(this.parentList.get(groupPosition)).size();
}
@Override
public Object getGroup(int groupPosition) {
// TODO Auto-generated method stub
return this.parentList.get(groupPosition);
}
@Override
public Object getChild(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return this.childList.get(this.parentList.get(groupPosition)).get(childPosition);
}
@Override
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return childPosition;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
String headerTitle = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this.context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.parent_item, null);
}
TextView lblListHeader = (TextView) convertView
.findViewById(R.id.tv_parent_item);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setText(headerTitle);
ExpandableListView eLV = (ExpandableListView) parent;
eLV.expandGroup(groupPosition);
return convertView;
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Songs childText = (Songs) getChild(groupPosition, childPosition);
if(convertView==null)
{
LayoutInflater infalInflater = (LayoutInflater) this.context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.child_item , null);
}
TextView artist = (TextView) convertView.findViewById(R.id.tv_child_item1);
TextView song = (TextView) convertView.findViewById(R.id.tv_child_item2);
ImageView image = (ImageView) convertView.findViewById(R.id.iv_child_item);
artist.setText(childText.getArtist());
song.setText(childText.getSong());
String imgUrl=childText.getArtwork();
imageLoader.displayImage(imgUrl, image);
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return true;
}
}
对于Main Activity OnCreate（）方法：
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
expListView = (ExpandableListView) findViewById(R.id.expandable_listview);
listParent = new ArrayList<String>();
listChild = new HashMap<String, List<Songs>>();
new GetData().execute();
listAdapter = new ExpandableAdapter(this, listParent, listChild);
expListView.setAdapter(listAdapter);
expListView.setOnGroupClickListener(new OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
Toast.makeText(getApplicationContext(),
"Group Clicked " + listParent.get(groupPosition),
Toast.LENGTH_SHORT).show();
return false;
}
});
expListView.setOnGroupExpandListener(new OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
}
});
expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
}
});
expListView.setOnChildClickListener(new OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
// TODO Auto-generated method stub
Toast.makeText(
getApplicationContext(),
listParent.get(groupPosition)
+ " : "
+ listChild.get(
listParent.get(groupPosition)).get(
childPosition), Toast.LENGTH_SHORT)
.show();
return false;
}
});
}
-1
投票
投票
在可扩展列表视图中，xml使用了android:nestedScrollingEnabled="true"
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