我正在Android中编写过滤器，并希望将BaseExpandableListAdapter与复选框一起使用。在我的情况下，如果组元素有任何子元素，也可以选择组元素。也可以选择所有子元素。优惠截图： enter image description here
当我打开对话框并选择必要的元素时，其选中的元素将放入文本edittext。我的问题在于，当我重新打开对话框并关闭/打开组元素时，我选择的复选框会发生变化。重新打开对话框时，我找不到解决方案如何记住选择。
我所有必要的代码都提供以下内容：
我的实体类：
public class Category implements Listable, Parcelable{
private int id;
private String title;
private String c_date;
private List<Category> sub_categories = new ArrayList<>();
private boolean isChecked;
private int parent;
protected Category(Parcel in) {
id = in.readInt();
title = in.readString();
c_date = in.readString();
sub_categories = in.createTypedArrayList(Category.CREATOR);
isChecked = in.readByte() != 0;
parent = in.readInt();
m_date = in.readString();
}
public static final Creator<Category> CREATOR = new Creator<Category>() {
@Override
public Category createFromParcel(Parcel in) {
return new Category(in);
}
@Override
public Category[] newArray(int size) {
return new Category[size];
}
};
@Override
public void writeToParcel(Parcel parcel, int i) {
parcel.writeInt(id);
parcel.writeString(title);
parcel.writeString(c_date);
parcel.writeTypedList(sub_categories);
parcel.writeByte((byte) (isChecked ? 1 : 0));
parcel.writeInt(parent);
parcel.writeString(m_date);
}
//getters, setters
}
我的适配器类：
public class CategoryAdapter extends BaseExpandableListAdapter {
private Context context;
private ArrayList<Category> categories;
private LayoutInflater inflater;
public CategoryAdapter(Context context,
ArrayList<Category> categoryList) {
this.context = context;
this.categories = categoryList;
inflater = LayoutInflater.from(context);
}
public Object getChild(int groupPosition, int childPosition) {
return categories.get(groupPosition).getSub_categories().get(childPosition);
}
public long getChildId(int groupPosition, int childPosition) {
return (long)( groupPosition*1024+childPosition ); // Max 1024 children per group
}
private static class ViewHolder {
private TextView title;
private CheckBox cb;
}
public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
View v = convertView;
ViewHolder viewHolder;
boolean isChecked = categories.get(groupPosition).getSub_categories().get(childPosition).isChecked();
if (v != null)
viewHolder = (ViewHolder) v.getTag();
else {
v = inflater.inflate(R.layout.category_child_row, parent, false);
viewHolder = new ViewHolder();
viewHolder.title = (TextView)v.findViewById(R.id.title);
viewHolder.cb = (CheckBox)v.findViewById(R.id.check);
viewHolder.cb.setChecked(isChecked);
viewHolder.cb.setOnCheckedChangeListener(new CheckchangeChildListener(groupPosition, childPosition));
v.setTag(viewHolder);
}
final Category c = (Category) getChild( groupPosition, childPosition );
viewHolder.title.setText(c.getTitle());
return v;
}
class CheckchangeChildListener implements CompoundButton.OnCheckedChangeListener {
private int position;
private int childPosition;
public CheckchangeChildListener(int position, int childPosition) {
this.position= position;
this.childPosition = childPosition;
}
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if (isChecked) {
categories.get(position).getSub_categories().get(childPosition).setChecked(true);
} else {
categories.get(position).getSub_categories().get(childPosition).setChecked(false);
}
}
}
public int getChildrenCount(int groupPosition) {
return categories.get(groupPosition).getSub_categories().size();
}
public Object getGroup(int groupPosition) {
return categories.get( groupPosition );
}
public int getGroupCount() {
return categories.size();
}
public long getGroupId(int groupPosition) {
return (long)( groupPosition*1024 ); // To be consistent with getChildId
}
private static class ViewGroupHolder {
private TextView title;
private CheckBox cb;
private ImageView image;
}
public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
View v = convertView;
ViewGroupHolder holder;
boolean isChecked = categories.get(groupPosition).isChecked();
if(v != null)
holder = (ViewGroupHolder)v.getTag();
else {
v = inflater.inflate(R.layout.category_parent_row, parent, false);
holder = new ViewGroupHolder();
holder.title = (TextView)v.findViewById(R.id.title);
holder.cb = (CheckBox)v.findViewById(R.id.check);
holder.cb.setChecked(isChecked);
holder.image = (ImageView)v.findViewById(R.id.arrow);
holder.cb.setOnCheckedChangeListener(new CheckchangeGroupListener(groupPosition));
v.setTag(holder);
}
final Category category = (Category)getGroup(groupPosition);
holder.title.setText(category.getTitle());
if(getChildrenCount(groupPosition) == 0){
holder.cb.setVisibility(View.VISIBLE);
holder.image.setVisibility(View.INVISIBLE);
} else {
holder.image.setVisibility(View.VISIBLE);
holder.cb.setVisibility(View.INVISIBLE);
holder.image.setImageResource(isExpanded ? R.drawable.ic_chevron_down : R.drawable.ic_chevron_right);
}
return v;
}
class CheckchangeGroupListener implements CompoundButton.OnCheckedChangeListener {
private int position;
public CheckchangeGroupListener(int position) {
this.position= position;
}
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if (isChecked) {
categories.get(position).setChecked(true);
} else {
categories.get(position).setChecked(false);
}
}
}
public boolean hasStableIds() {
return true;
}
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
public void onGroupCollapsed (int groupPosition) {}
public void onGroupExpanded(int groupPosition) {}
public ArrayList<Category> getSelectedCats(){
ArrayList<Category> checkedCategories = new ArrayList<>();
for(Category c: categories){
if(c.isChecked()) checkedCategories.add(c);
if(!c.getSub_categories().isEmpty()){
for(Category category: c.getSub_categories()) {
if (category.isChecked()) checkedCategories.add(category);
}
}
}
return checkedCategories;
}
}
我的自定义EditText：
public class CategoryEditText<T extends Listable> extends EditText {
List<T> mItems;
String[] mListableItems;
CharSequence mHint;
OnItemSelectedListener<T> onItemSelectedListener;
DialogFragment newFragment;
public CategoryEditText(Context context) {
super(context);
mHint = getHint();
}
public CategoryEditText(Context context, AttributeSet attrs) {
super(context, attrs);
mHint = getHint();
}
public CategoryEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mHint = getHint();
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public CategoryEditText(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
mHint = getHint();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
setFocusable(false);
setClickable(true);
}
public void setItems(List<T> items) {
this.mItems = items;
newFragment = CategoryDialogFragment.newInstance((ArrayList<Category>)mItems, this);
this.mListableItems = new String[items.size()];
int i = 0;
for (T item : mItems) {
mListableItems[i++] = item.getLabel();
}
configureOnClickListener();
}
private void configureOnClickListener() {
setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
Context context = getContext();
FragmentManager fm = ((Activity) context).getFragmentManager();
newFragment.show(fm, "dialog");
}
});
}
public void setOnItemSelectedListener(OnItemSelectedListener<T> onItemSelectedListener) {
this.onItemSelectedListener = onItemSelectedListener;
}
public interface OnItemSelectedListener<T> {
void onItemSelectedListener(T item, int selectedIndex);
}
}
我的自定义dialogfragment显示列表：
public class CategoryDialogFragment extends DialogFragment {
ArrayList<Category> categories;
static EditText editText;
public static CategoryDialogFragment newInstance(ArrayList<Category> categories, EditText customEditText) {
CategoryDialogFragment frag = new CategoryDialogFragment();
Bundle args = new Bundle();
args.putParcelableArrayList("categories", categories);
frag.setArguments(args);
editText = customEditText;
return frag;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
categories = getArguments().getParcelableArrayList("categories");
View v = LayoutInflater.from(getActivity()).inflate(R.layout.select_category_layout, null);
ExpandableListView expandableListView = (ExpandableListView) v.findViewById(R.id.list);
final CategoryAdapter categoryAdapter = new CategoryAdapter(getActivity(), categories);
expandableListView.setAdapter(categoryAdapter);
MaterialDialog dialog = new MaterialDialog.Builder(getActivity())
.title(R.string.shop_category)
.customView(v, false)
.positiveText(R.string.select)
.negativeText(android.R.string.cancel)
.onPositive(new MaterialDialog.SingleButtonCallback() {
@Override
public void onClick(@NonNull MaterialDialog materialDialog, @NonNull DialogAction dialogAction) {
ArrayList<Category> cats = categoryAdapter.getSelectedCats();
String selectedText = "";
for(int i=0; i<cats.size(); i++){
selectedText += cats.get(i).getTitle();
if(i+1 < cats.size()){
selectedText += " | ";
}
}
editText.setText(selectedText);
materialDialog.dismiss();
}
})
.build();
return dialog;
}
}
我试着在网上阅读，但我没有找到解决问题的方法。
答案 0 :(得分：0)
问题在于您的getView()方法。我建议阅读如何正确编写列表适配器类。
private static class ViewHolder {
private TextView title;
private ChecBbox cb;
}
public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
View v = convertView;
ViewHolder holder;
boolean isChecked = categories.get(groupPosition).getSub_categories().get(childPosition).isChecked();
if( convertView != null )
viewHolder = (ViewHolder) v.getTag();
else {
v = inflater.inflate(R.layout.category_child_row, parent, false);
viewHolder = new ViewHolder();
holder.title = (TextView)v.findViewById(R.id.title);
holder.cb = (CheckBox)v.findViewById(R.id.check);
holder.cb.setChecked(isChecked);
cb.setOnCheckedChangeListener(new CheckchangeChildListener(groupPosition, childPosition));
v.setTag(viewHolder);
}
final Category c = (Category) getChild( groupPosition, childPosition );
title.setText(c.getTitle());
return v;
}
检查已更改的侦听器：
class CheckchangeGroupListener implements CompoundButton.OnCheckedChangeListener {
private int groupPosition, childPosition;
public CheckchangeGroupListener(int groupPosition, int childPosition) {
this.groupPosition= groupPosition;
this.childPosition = childPosition;
}
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if (isChecked) {
categories.get(groupPosition).getSub_categories().get(childPosition).setChecked(true);
} else {
categories.get(groupPosition).getSub_categories().get(childPosition).setChecked(false);
}
}