我是Android上的新手，请尝试编写“购物车”应用。
我所拥有的：
我的ExpandableList按类别显示我的项目。在每个孩子的最后，我放置了一个带有“ to buy”图像的复选框。当我单击第一类中第一项的复选框时，子级将移动到列表末尾的“已购买”类别。在此“购买”类别中，复选框的图像应更改为“购买”图像。到目前为止一切顺利。
问题：
“已购买”类别中的图像不是“已购买”图像。 取而代之的是，我列表中的第一项有一个“购买”图像。
有人知道出了什么问题吗？
MainActivity：
import android.app.Activity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.ExpandableListView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Set;
public class MainActivity extends Activity {
private ExpandableListView mExpandableList;
private CheckBox cbChildren;
private ArrayList<Children> listOfChildren;
private ArrayList<Parent> arOfParents;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mExpandableList = (ExpandableListView) findViewById(R.id.expandable_list);
cbChildren = (CheckBox) findViewById(R.id.cbListItemChild);
ArrayList<Parent> arrayParents = new ArrayList<>();
ArrayList<Children> arrayChildren;
ArrayList<Children> testArray = new ArrayList<Children>();
testArray.add(new Children("Item1", "Cat1", 1, null, true, false,false));
testArray.add(new Children("Item2", "Cat1", 1, null, true, false,true));
testArray.add(new Children("Item3", "Cat2", 1, null, true, true,false));
testArray.add(new Children("Item4", "Cat3", 1, "Pack", true, true,false));
testArray.add(new Children("Item5", "Cat4", 1, null, true, false,false));
testArray.add(new Children("Item6", "Cat5", 1, "piece", false, false,false));
getArrayOfChildsFromDB(testArray);
// createArrayOfParents(testArray);
//sets the adapter that provides data to the list.
mExpandableList.setAdapter(new MyCustomAdapter(MainActivity.this, arOfParents));
// Always expand the views
for (int i = 0; i < arOfParents.size(); i++) {
mExpandableList.expandGroup(i);
}
}
private void getArrayOfChildsFromDB(ArrayList<Children> testArray) {
listOfChildren =testArray;
createArrayOfParents(listOfChildren);
}
private void createArrayOfParents(ArrayList<Children> listOfChildren) {
arOfParents = new ArrayList<Parent>();
HashMap<String, ArrayList<Children>> map = new HashMap<>();
for (Children child : listOfChildren) {
if (!map.containsKey(child.getArtikelKategorie())) {
map.put(child.getArtikelKategorie(), new ArrayList<Children>());
map.get(child.getArtikelKategorie()).add(child);
} else {
map.get(child.getArtikelKategorie()).add(child);
}
}
Set<String> keys = map.keySet();
for (String key : keys) {
Parent parent = new Parent();
parent.setTitle(key);
parent.setArrayChildren(map.get(key));
arOfParents.add(parent);
}
}
}
MyCustomAdapter
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MyCustomAdapter extends BaseExpandableListAdapter {
private LayoutInflater inflater;
private ArrayList<Parent> mParent;
private Context Kontext;
private int count = 0;
Children child;
private CheckBox childCheckBox;
public MyCustomAdapter(Context context, ArrayList<Parent> parent) {
mParent = parent;
inflater = LayoutInflater.from(context);
Kontext = 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 groupPosition) {
Log.e("EXPANDABLE LIST", "GROUP " + groupPosition + " " + mParent.get(groupPosition).getArrayChildren()
.size() + "");
return mParent.get(groupPosition).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
public int getChildTypeCount() {
return 6;
}
@Override
//in this method you must set the text to see the parent/group on the list
public View getGroupView(int groupPosition, boolean b, View convertView, ViewGroup viewGroup) {
ViewHolder holder = new ViewHolder();
holder.groupPosition = groupPosition;
if (convertView == null) {
convertView = inflater.inflate(R.layout.list_item_parent, viewGroup, false);
holder.groupTitle = (TextView) convertView.findViewById(R.id.list_item_text_view);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.groupTitle.setText(getGroup(groupPosition).toString());
//return the entire view
return convertView;
}
@Override
//in this method you must set the text to see the children on the list
public View getChildView(final int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup viewGroup) {
// final ViewHolder holder;
final ViewHolderChild holder;
child = mParent.get(groupPosition).getArrayChildren().get
(childPosition);
if (convertView == null) {
holder = new ViewHolderChild();
convertView = inflater.inflate(R.layout.child_list_layout, viewGroup, false);
holder.childTitle = (TextView) convertView.findViewById(R.id.list_item_text_child);
holder.childCheckBox = (CheckBox) convertView.findViewById((R.id.cbListItemChild));
convertView.setTag(holder);
} else {
holder = (ViewHolderChild) convertView.getTag();
}
holder.childTitle.setText(mParent.get(groupPosition).getArrayChildren().get(childPosition).getArtikelName());
convertView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(Kontext.getApplicationContext(), "Gekauft : " +mParent.get(groupPosition).getArrayChildren().get
(childPosition).gekauft
+ "", Toast.LENGTH_SHORT).show();
}
});
holder.childCheckBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(Kontext.getApplicationContext(), "You have selected item : " +mParent.get(groupPosition).getArrayChildren().get
(childPosition).name
+ "", Toast.LENGTH_SHORT).show();
mParent.get(groupPosition).getArrayChildren().get
(childPosition).setIstArtikelGekauft(true);
// holder.childCheckBox.setChecked(true);
// notifyDataSetChanged();
// if (mParent.get(groupPosition).getArrayChildren().get(childPosition).getIsChecked()) {
// holder.childCheckBox.setChecked(true);
// notifyDataSetChanged();
// } else {
// holder.childCheckBox.setChecked(false);
// notifyDataSetChanged();
// }
addChildToGroup(mParent.get(groupPosition).getArrayChildren().get
(childPosition), mParent.size() - 1, "Parent 25 (Hardcoded)");
removeChildFromGroup(groupPosition, childPosition);
notifyDataSetChanged();
}
});
//return the entire view
return convertView;
}
@Override
public boolean isChildSelectable(int i, int i1) {
return true;
}
public void removeGroup(int groupPosition) {
mParent.remove(groupPosition);
Log.e("removeGroup", "group size " + mParent.size());
notifyDataSetChanged();
}
/**
* Removes child at childPosition from group at groupPosition. If it is the last child in group
* the group will also be deleted.
*
* @param groupPosition Position of the group in which the child exists
* @param childPosition Position of the child in the group
*/
public void removeChildFromGroup(int groupPosition, int childPosition) {
Parent parent = mParent.get(groupPosition);
parent.getArrayChildren().remove(childPosition);
if (parent.getArrayChildren().isEmpty()) {
removeGroup(groupPosition);
} else {
notifyDataSetChanged();
}
}
public void addChildToGroup(Children childName, int groupPosition, String sectionTitle) {
Parent parent = mParent.get(groupPosition);
List<Children> arrayChildren = parent.getArrayChildren();
if (!parent.getTitle().equals(sectionTitle)) {
parent = new Parent();
arrayChildren = new ArrayList<>();
parent.setTitle(sectionTitle);
mParent.add(parent);
}
arrayChildren.add(childName);
parent.setArrayChildren(arrayChildren);
notifyDataSetChanged();
}
protected class ViewHolder {
protected int groupPosition;
protected TextView groupTitle;
protected TextView childTitle;
}
private class ViewHolderChild {
TextView childTitle;
CheckBox childCheckBox;
View viewDivider;
}
}