【发布时间】：2015-01-04 16:56:44
【问题描述】：
我不知道如何在我的 Expandablelist 适配器和 MainActivty 中添加多个 Textview。当我尝试在适配器中添加新的 Textview 时，我无法弄清楚如何在 MainAcivity 中初始化 Textview。它只是将我放在第一个 Textview 中的文本复制到新的文本中。我发现了一些其他关于这个的 Stackoverflow 帖子，但没有一个有答案。如果有人知道如何做到这一点，我将不胜感激。请举一个例子，因为我是这个初学者。我遵循了这个http://www.tutorialsbuzz.com/2014/07/custom-expandable-listview-image-text.html的教程
还可以在我的代码中查看几个 cmets，看看我想要做什么。
可扩展列表适配器：
import android.view.LayoutInflater;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
public class ExpandListAdapter extends BaseExpandableListAdapter {
private Context context;
private ArrayList<Group> groups;
public ExpandListAdapter(Context context, ArrayList<Group> groups) {
this.context = context;
this.groups = groups;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
ArrayList<Child> chList = groups.get(groupPosition).getItems();
return chList.get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
Child child = (Child) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) context
.getSystemService(context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.child_item, null);
}
TextView tv = (TextView) convertView.findViewById(R.id.country_name);
//trying to add this textview ltv
TextView ltv = (TextView) convertView.findViewById(R.id.large_text);
ImageView iv = (ImageView) convertView.findViewById(R.id.flag);
tv.setText(child.getName().toString());
iv.setImageResource(child.getImage());
ltv.setText(child.getName().toString());
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) l
@Override
public Object getGroup(int groupPosition) {
return groups.get(groupPosition);
}
@Override
public int getGroupCount() {
return groups.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
Group group = (Group) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater inf = (LayoutInflater) context
.getSystemService(context.LAYOUT_INFLATER_SERVICE);
convertView = inf.inflate(R.layout.group_item, null);
}
TextView tv = (TextView) convertView.findViewById(R.id.group_name);
tv.setText(group.getName());
return convertView;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
主活动：
import java.util.ArrayList;
import java.util.Set;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ExpandableListView;
public class Brandspage extends Activity {
private ExpandListAdapter ExpAdapter;
private ExpandableListView ExpandList;
private ArrayList<Group> ExpListItems;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_brandspage);
Button b1 = (Button) findViewById(R.id.button4);
b1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(Brandspage.this, MainActivity.class);
startActivity(i);
}
});
ExpandList = (ExpandableListView) findViewById(R.id.exp_list);
ExpListItems = SetStandardGroups();
ExpAdapter = new ExpandListAdapter(Brandspage.this, ExpListItems);
ExpandList.setAdapter(ExpAdapter);
}
public ArrayList<Group> SetStandardGroups() {
//how to initialize the ltv textview here with the other strings
String group_names[] = {"A-G", "H-N", "O-U", "V-Z"
};
String country_names[] = {
" " +
"\n" +
"\n" +
" \n" +
"\n" +
"\n" +
"\n" +
" \n" +
"\n" +
" \n" +
"\n" +
" \n "
};
int Images[] = {R.drawable.ic_launcher, R.drawable.ic_launcher,
R.drawable.ic_launcher, R.drawable.ic_launcher
};
ArrayList<Group> list = new ArrayList<Group>();
ArrayList<Child> ch_list;
int size = 20;
int j = 0;
for (String group_name : group_names) {
Group gru = new Group();
gru.setName(group_name);
ch_list = new ArrayList<Child>();
for (; j < size; j++) {
Child ch = new Child();
ch.setName(country_names[j]);
ch.setImage(Images[j]);
ch_list.add(ch);
}
gru.setItems(ch_list);
list.add(gru);
size = size + 20;
}
return list;
}
}
子项.xml
<?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:paddingTop="4dp"
android:paddingBottom="4dp"
android:layout_marginLeft="50dp"
>
<TextView
android:id="@+id/country_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:textSize="20dp"
android:layout_below="@+id/large_text"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="66dp" />
<ImageView
android:id="@+id/flag"
android:layout_width="fill_parent"
android:layout_height="100dp"
android:src="@drawable/ic_launcher"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
//Want this Large Text to be in the ExpandableListView
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="@+id/large_text"
android:layout_below="@+id/flag"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
【问题讨论】：
标签： java android textview expandablelistview