我发现了很多关于这个问题的问题，但我无法修复它。我花了一整天时间无法解决。我也重新检查了我的for循环
如果我有父母价值7，如果我点击第4位父母进行扩展，我再次点击第二位父母，其费用和工作正常。但如果我点击第5或第6或第7个家长我收到此错误..我不知道我的代码在哪里错了..
LogCat：
07-12 11:56:24.504: E/AndroidRuntime(3548): FATAL EXCEPTION: main
07-12 11:56:24.504: E/AndroidRuntime(3548): java.lang.IndexOutOfBoundsException: Invalid index 1, size is 0
07-12 11:56:24.504: E/AndroidRuntime(3548): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
07-12 11:56:24.504: E/AndroidRuntime(3548): at java.util.ArrayList.add(ArrayList.java:143)
07-12 11:56:24.504: E/AndroidRuntime(3548): at android.widget.ExpandableListConnector.expandGroup(ExpandableListConnector.java:685)
07-12 11:56:24.504: E/AndroidRuntime(3548): at android.widget.ExpandableListView.handleItemClick(ExpandableListView.java:562)
07-12 11:56:24.504: E/AndroidRuntime(3548): at android.widget.ExpandableListView.performItemClick(ExpandableListView.java:522)
07-12 11:56:24.504: E/AndroidRuntime(3548): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2812)
07-12 11:56:24.504: E/AndroidRuntime(3548): at android.widget.AbsListView$1.run(AbsListView.java:3571)
07-12 11:56:24.504: E/AndroidRuntime(3548): at android.os.Handler.handleCallback(Handler.java:725)
07-12 11:56:24.504: E/AndroidRuntime(3548): at android.os.Handler.dispatchMessage(Handler.java:92)
07-12 11:56:24.504: E/AndroidRuntime(3548): at android.os.Looper.loop(Looper.java:153)
07-12 11:56:24.504: E/AndroidRuntime(3548): at android.app.ActivityThread.main(ActivityThread.java:5297)
07-12 11:56:24.504: E/AndroidRuntime(3548): at java.lang.reflect.Method.invokeNative(Native Method)
07-12 11:56:24.504: E/AndroidRuntime(3548): at java.lang.reflect.Method.invoke(Method.java:511)
07-12 11:56:24.504: E/AndroidRuntime(3548): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
07-12 11:56:24.504: E/AndroidRuntime(3548): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
07-12 11:56:24.504: E/AndroidRuntime(3548): at dalvik.system.NativeStart.main(Native Method)
Java
mAdapter = new MyExpandableListAdapter(MainActivity.this, listchapt,
null);
elvForDialog.setIndicatorBounds(width - 20, width);// 130
elvForDialog.setAdapter(mAdapter);
elvForDialog.setOnGroupClickListener(new OnGroupClickListener() {
public boolean onGroupClick(ExpandableListView arg0, View arg1,
int arg2, long arg3) throws RuntimeException {
String pos = (String)mAdapter.getGroup(arg2);
System.out.println("position" + pos);
List<String> children = new ArrayList<String>();
children.clear();
listNames.clear();
for (int i = 0; i < listchapt.size(); i++) {
dbHelper.openDataBase();
children = dbHelper.GetSubchapt(pos);
dbHelper.close();
listNames.add(children); // line no.143
}
System.out.println("position" + pos);
Display newDisplay = getWindowManager().getDefaultDisplay();
int width = newDisplay.getWidth();
mAdapter = new MyExpandableListAdapter(MainActivity.this,
listchapt, listNames);
elvForDialog.setIndicatorBounds(width - 20, width);// 130
elvForDialog.setAdapter(mAdapter);
System.out.println("explist" + listSubchapt);
try {
Log.v("LH", "ssetOnGroupClickListener");
Log.v("LH", "" + viewListLastSelected.toString());
Log.v("LH",
"" + ((TextView) viewListLastSelected).getText());
} catch (Exception e) {
Log.v("LH", "ERROR@onCreate: " + e.toString());
}
return false;
}
});
elvForDialog.setOnChildClickListener(new OnChildClickListener() {
public boolean onChildClick(ExpandableListView arg0, View arg1,
int arg2, int arg3, long arg4) throws RuntimeException {
currentChapt = listchapt.get(arg2).toString();
currentSubchapt = listNames.get(arg2).get(arg3).toString();
System.out.println("Yes it shows child " + currentChapt
+ currentSubchapt);
// createExpandableListViewDialog(1);
Intent in = new Intent(MainActivity.this, WebContent.class);
in.putExtra("chapterid", currentChapt);
in.putExtra("subchaptid", currentSubchapt);
startActivity(in);
elvForDialog.clearChildFocus(viewListLastSelected);
try {
viewListLastSelected.setBackgroundDrawable(null);
((TextView) viewListLastSelected).setTextColor(Color.GRAY);
} catch (Exception e) {
}
((TextView) arg1).setTextColor(Color.WHITE);
viewListLastSelected = arg1;
return false;
}
});
elvForDialog.setOnGroupExpandListener(new OnGroupExpandListener() {
public void onGroupExpand(int groupPosition) {
int len = mAdapter.getGroupCount();
for (int i = 0; i < len; i++) {
if (i != groupPosition) {
elvForDialog.collapseGroup(i);
}
}
}
});
MyAdapter类
public class MyExpandableListAdapter extends BaseExpandableListAdapter {
Activity activity;
List<String> listGroup = new ArrayList<String>();
List<List<String>> listChild = new ArrayList<List<String>>();
private int _posGroup = 0;
private int _posChild = 0;
public MyExpandableListAdapter(Activity a, List<String> group, List<List<String>> children){
super();
activity = a;
listGroup = group;
listChild = children;
}
public Object getChild(int groupPosition, int childPosition) {
return listChild.get(groupPosition).get(childPosition);
}
public long getChildId(int groupPosition, int childPosition) {
//Log.v("LH", "ChildID: " + childPosition);
_posGroup = groupPosition;
_posChild = childPosition;
return childPosition;
}
public int getChildrenCount(int groupPosition) {
return listChild.get(groupPosition).size(); //line no 51
}
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
String string = listChild.get(groupPosition).get(childPosition);
View view = getGenericChildView(string);
TextView text = (TextView) view;
if(this._posGroup==groupPosition &&
this._posChild==childPosition)
{
text.setTextColor(Color.rgb(85, 85, 85));
text.setTypeface(null, Typeface.BOLD);
}
view.setBackgroundResource(R.drawable.menu_submenubg);
return view;
}
//group method stub
public Object getGroup(int groupPosition) {
return listGroup.get(groupPosition);
}
public int getGroupCount() {
return listGroup.size();
}
public long getGroupId(int groupPosition) {
//Log.v("LH", "GroupID: " + groupPosition);
return groupPosition;
}
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
String string = listGroup.get(groupPosition);
View result=getGenericGroupView(string);
result.setBackgroundResource(R.drawable.menu_hoverbg);
return result;
}
public TextView getGenericChildView(String s) {
AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT, 0);
lp.height=73; //73,50
TextView text = new TextView(activity);
text.setLayoutParams(lp);
text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
text.setPadding(50, 0, 0, 0);
text.setTextColor(Color.rgb(85, 85, 85));
text.setTypeface(null, Typeface.BOLD);
text.setTextSize(15);
text.setText(s);
return text;
}
public TextView getGenericGroupView(String s) {
AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT, 0);
lp.height=60;
TextView text = new TextView(activity);
text.setLayoutParams(lp);
text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
text.setPadding(20, 0, 0, 0);
text.setTextSize(20);
text.setTextColor(Color.WHITE);
text.setText(s);
return text;
}
public boolean hasStableIds() {
return false;
}
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
提前感谢..
编辑： DBHelper
public class DBHelper extends SQLiteOpenHelper {
public int GetCursor;
private Context myContext;
public String DB_PATH = "data/data/com.redcaso.mia/databases/"; // path
public static String DB_NAME = "Test.sqlite";// your database name
static String ASSETS_DB_FOLDER = "db";
private SQLiteDatabase db;
public DBHelper(Context context) {
super(context, DB_NAME, null, 2);
if (db != null && db.isOpen())
close();
this.myContext = context;
//DB_NAME = db_name;
try {
createDataBase();
openDataBase();
} catch (IOException e) {
// System.out.println("Exception in creation of database : "+
// e.getMessage());
e.printStackTrace();
}
}
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
// System.out.println("Database Exist");
} else {
this.getReadableDatabase();
try {
copyDatabase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
private void copyDatabase() throws IOException {
InputStream input = myContext.getAssets().open(DB_NAME);
String outputFileName = DB_PATH + DB_NAME;
OutputStream output = new FileOutputStream(outputFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = input.read(buffer)) > 0) {
output.write(buffer, 0, length);
}
// Close the streams
output.flush();
output.close();
input.close();
// System.out.println(DB_NAME + "Database Copied !");
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void openDataBase() throws SQLException {
// Open the database
String myPath = DB_PATH + DB_NAME;
db = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READWRITE);
}
public boolean isOpen() {
if (db != null)
return db.isOpen();
return false;
}
@Override
public synchronized void close() {
if (db != null)
db.close();
super.close();
}
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READWRITE);
} catch (Exception e) {
// database does't exist yet.
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
public Cursor execCursorQuery(String sql) {
Cursor cursor = null;
try {
cursor = db.rawQuery(sql, null);
GetCursor = cursor.getCount();
Log.i("Inside execCursorQuery try", sql);
} catch (Exception e) {
Log.i("Inside execCursorQuery exception", e.getMessage());
}
return cursor;
}
public void execNonQuery(String sql) {
try {
db.execSQL(sql);
// Log.d("SQL", sql);
} catch (Exception e) {
// Log.e("Err", e.getMessage());
} finally {
// closeDb();
}
}
public ArrayList<String> GetchapterID(){
String sql="";
//System.out.println("Inside Database");
sql="select distinct(ChapterId) from contents";
ArrayList<String> list = new ArrayList<String>();
Cursor cursor=db.rawQuery(sql, null);
try{
if(cursor != null){
if (cursor.moveToFirst()) {
do {
list.add(cursor.getString(0));
}
while (cursor.moveToNext());
}
if (cursor != null && !cursor.isClosed()) {
cursor.close();
}
}
else
Toast.makeText(myContext, "No values in DB", Toast.LENGTH_SHORT).show();
}
catch(Exception e){
System.out.println("GetGradeNames(): " +e);
}
return list;
}
public ArrayList<String> GetSubchapt(String type){
String sql="";
sql="select distinct(SubchapterId) from contents where ChapterId='"+type+"'";
ArrayList<String> list = new ArrayList<String>();
Cursor cursor=db.rawQuery(sql, null);
try{
if(cursor != null){
if (cursor.moveToFirst()) {
do {
list.add(cursor.getString(0));
}
while (cursor.moveToNext());
}
if (cursor != null && !cursor.isClosed()) {
cursor.close();
}
}
else
Toast.makeText(myContext, "No Property in DB", Toast.LENGTH_SHORT).show();
}
catch(Exception e){
System.out.println("GetLevelNames(): " +e);
}
return list;
}
public ArrayList<String> GetName(String chapter,String subchapt){
String sql="";
sql="select distinct(filename) from contents where SubchapterId='"+subchapt+"' and ChapterId='"+chapter+"'";
ArrayList<String> list = new ArrayList<String>();
Cursor cursor=db.rawQuery(sql, null);
//list.add("All Topics - Entire "+grade);
try{
if(cursor != null){
if (cursor.moveToFirst()) {
do {
list.add(cursor.getString(0));
}
while (cursor.moveToNext());
}
if (cursor != null && !cursor.isClosed()) {
cursor.close();
}
}
else
Toast.makeText(myContext, "No Address in DB", Toast.LENGTH_SHORT).show();
}
catch(Exception e){
//System.out.println("GetBasicTopicNames(): " +e);
}
return list;
}
答案 0 :(得分：2)
您将孩子存放错误，并且每次添加新孩子时都不必重新创建适配器。
以下是一些使您的代码正常运行的修复程序：
将适配器构造函数更改为，因此它只接收活动和组：
public MyExpandableListAdapter(Activity a, List<String> group){
this.activity = a;
this.listGroup = group;
}
更改子项列表的类型，以便您可以通过groupPosition访问它们，如下所示：
SparseArray<List<String>> listChild = new SparseArray<List<String>>();
现在在适配器中创建一个添加子项的新方法：
public addChildren(int groupPosition, List<String> children) {
this.listChild.put(groupPosition, children);
}
现在已经处理了适配器，修复了OnGroupClick事件。不是每次都设置新的适配器，而是添加或删除子项（基于子项是否已存在）：
expList.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
if (mAdapter.getChildrenCount == 0) {
dbHelper.openDataBase();
children = dbHelper.GetSubchapt(pos);
dbHelper.close();
mAdapter.addChildren(groupPosition, children);
}
else
mAdapter.removeChildren(groupPosition);
return false;
}
});
GroupClick事件现已修复。剩下的就是调整你的getChildrenCount方法，这样它就不会抛出NPE：
public int getChildrenCount(int groupPosition) {
if (listChild.get(groupPosition) == null) {
Log.e("mAdapter.getChildrenCount", "Tried to access group's "+
groupPosition+" children which have not yet been added!");
return 0;
}
else
return listChild.get(groupPosition).size();
}
发布可能发生的任何其他错误，因为此代码未通过您的设置进行测试。
答案 1 :(得分：0)
所以你的问题出在你的onGroupClick上。返回值为false表示不处理click事件，因此在日志中找不到任何内容是正常的，因为在SDK中调用了expandGroup。
尝试在onGroupClick中返回true值并自行处理折叠/展开。
public boolean onGroupClick(ExpandableListView arg0, View arg1,
int arg2, long arg3) throws RuntimeException {
String pos = (String)mAdapter.getGroup(arg2);
System.out.println("position" + pos);
List<String> children = new ArrayList<String>();
children.clear();
listNames.clear();
for (int i = 0; i < listchapt.size(); i++) {
dbHelper.openDataBase();
children = dbHelper.GetSubchapt(pos);
dbHelper.close();
listNames.add(children); // line no.143
}
System.out.println("position" + pos);
Display newDisplay = getWindowManager().getDefaultDisplay();
int width = newDisplay.getWidth();
mAdapter = new MyExpandableListAdapter(MainActivity.this,
listchapt, listNames);
elvForDialog.setIndicatorBounds(width - 20, width);// 130
elvForDialog.setAdapter(mAdapter);
System.out.println("explist" + listSubchapt);
try {
Log.v("LH", "ssetOnGroupClickListener");
Log.v("LH", "" + viewListLastSelected.toString());
Log.v("LH",
"" + ((TextView) viewListLastSelected).getText());
} catch (Exception e) {
Log.v("LH", "ERROR@onCreate: " + e.toString());
}
if (elvForDialog.isGroupExpanded(arg2))
elvForDialog.collapseGroup(arg2);
else
elvForDialog.expandGroup(arg2);
return true;
}
});