我正在尝试使用可扩展列表。设计部分工作正常，但是当我在按钮上设置侦听器时，应用程序崩溃并显示一条消息：“不幸的是，您的应用程序已停止工作”。以下是供参考的应用程序详细信息，请如果有人知道如何在可扩展列表的父节点中的按钮上设置侦听器请告诉我。非常感谢提前：
应用程序清单文件：
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.expandablelist.MyActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
主要活动 xml 布局文件：
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ExpandableListView
android:id="@+id/expandable_list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:transcriptMode="alwaysScroll"
android:cacheColorHint="#00000000"
android:listSelector="@android:color/transparent">
</ExpandableListView>
</LinearLayout>
父节点的xml布局文件：
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/list_item_text_view"
android:textSize="20sp"
android:padding="10dp"
android:background="#ff000000"
android:textColor="#ffffffff"
android:layout_weight="1"
android:layout_marginLeft="35dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="button"
android:focusable="false"
android:layout_gravity="right"
android:focusableInTouchMode="false"
android:id="@+id/button"/>
</LinearLayout>
子节点的xml布局文件：
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/list_item_text_child"
android:textSize="20sp"
android:padding="10dp"
android:background="#ff000000"
android:layout_marginLeft="5dp"/>
</LinearLayout>
Mainactivity 命名为 Myactivity 代码：
package com.example.expandablelist;
import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.ExpandableListView;
public class MyActivity extends Activity {
private ExpandableListView mExpandableList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
mExpandableList = (ExpandableListView)findViewById(R.id.expandable_list);
ArrayList<Parent> arrayParents = new ArrayList<Parent>();
ArrayList<String> arrayChildren = new ArrayList<String>();
//here we set the parents and the children
for (int i = 0; i < 10; i++){
//for each "i" create a new Parent object to set the title and the children
Parent parent = new Parent();
parent.setTitle("Parent " + i);
arrayChildren = new ArrayList<String>();
for (int j = 0; j < 10; j++) {
arrayChildren.add("Child " + j);
}
parent.setArrayChildren(arrayChildren);
//in this array we add the Parent object. We will use the arrayParents at the setAdapter
arrayParents.add(parent);
}
//sets the adapter that provides data to the list.
mExpandableList.setAdapter(new MyCustomAdapter(MyActivity.this,arrayParents));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_my, menu);
return true;
}
}
父类代码：
package com.example.expandablelist;
import java.util.ArrayList;
public class Parent {
// private String mTitle;
private String mTitle;
private ArrayList<String> mArrayChildren;
public String getTitle() {
//return mTitle;
return mTitle;
}
public void setTitle(String mTitle) {
//this.mTitle = mTitle;
this.mTitle=mTitle;
}
public ArrayList<String> getArrayChildren() {
//return mArrayChildren;
return mArrayChildren;
}
public void setArrayChildren(ArrayList<String> mArrayChildren) {
//this.mArrayChildren = mArrayChildren;
this.mArrayChildren=mArrayChildren;
}
}
mycustomadapter 类的代码：
package com.example.expandablelist;
import java.util.ArrayList;
import android.content.Context;
import android.database.DataSetObserver;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;
public class MyCustomAdapter extends BaseExpandableListAdapter {
private LayoutInflater inflater;
private ArrayList<Parent> mParent;
public MyCustomAdapter(Context context, ArrayList<Parent> parent){
mParent = parent;
//inflater = LayoutInflater.from(context);
inflater=LayoutInflater.from(context);
}
@Override
// //counts the number of group/parent items so the list knows how many times calls getGroupView() method
public int getGroupCount() {
return mParent.size();
}
@Override
//counts the number of children items so the list knows how many times calls getChildView() method
public int getChildrenCount(int i) {
return mParent.get(i).getArrayChildren().size();
}
@Override
//gets the title of each parent/group
public Object getGroup(int i) {
return mParent.get(i).getTitle();
}
@Override
//gets the name of each item
public Object getChild(int i, int i1) {
return mParent.get(i).getArrayChildren().get(i1);
}
@Override
public long getGroupId(int i) {
return i;
}
@Override
public long getChildId(int i, int i1) {
return i1;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
//in this method you must set the text to see the parent/group on the list
public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {
if (view == null) {
view = inflater.inflate(R.layout.list_item_parent, viewGroup,false);
}
TextView textView = (TextView) view.findViewById(R.id.list_item_text_view);
//"i" is the position of the parent/group in the list
textView.setText(getGroup(i).toString());
//return the entire view
return view;
}
@Override
//in this method you must set the text to see the children on the list
public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {
if (view == null) {
view = inflater.inflate(R.layout.list_item_child, viewGroup,false);
}
TextView textView = (TextView) view.findViewById(R.id.list_item_text_child);
//"i" is the position of the parent/group in the list and
//"i1" is the position of the child
textView.setText(mParent.get(i).getArrayChildren().get(i1));
//return the entire view
return view;
}
@Override
public boolean isChildSelectable(int i, int i1) {
return true;
}
@Override
public void registerDataSetObserver(DataSetObserver observer) {
/* used to make the notifyDataSetChanged() method work */
super.registerDataSetObserver(observer);
}
}