我正在开发一款应用程序,用户可以在其中填写报告和民意调查。在一个 Activity 中,我有一个 ListView,其中子项包含 EditTexts、Checkbox 和 TextView。
EditTexts 和 Checkbox 的问题是滚动时,它们所拥有的内容会丢失。我能够通过将检查状态保存在数组中来解决复选框问题,但无法解决 EditTexts 的问题。我知道关于这个特定问题存在一些疑问,但他们提供的解决方案似乎不起作用。这是我的适配器:
public class DiveProfileAdapter extends ArrayAdapter<DiveProfile> {
private Context mContext;
private List<DiveProfile> mTasks;
ViewHolder holder;
private ArrayList<Boolean> itemChecked = new ArrayList<>(); //for saving checkbox values
public DiveProfileAdapter(Context context, List<DiveProfile> objects) {
super(context, R.layout.row_dive_profile_divers_list_item, objects);
this.mContext = context;
this.mTasks = objects;
for (int i = 0; i < this.getCount(); i++) {
itemChecked.add(i, false); // initializes all items value with false
}
}
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater mLayoutInflater = LayoutInflater.from(mContext);
convertView = mLayoutInflater.inflate(R.layout.row_dive_profile_divers_list_item, null);
holder = new ViewHolder();
holder.diverAttended = (CheckBox) convertView.findViewById(R.id.diver_attended_checkbox);
holder.diveTime = (EditText) convertView.findViewById(R.id.dive_time_edit_text);
holder.depth = (EditText) convertView.findViewById(R.id.depth_edit_text);
convertView.setTag(holder);
}else {
holder = (ViewHolder) convertView.getTag();
}
final DiveProfile diverObjectTask = mTasks.get(position);
holder.diverAttended.setChecked(diverObjectTask.isDiverAttended());
holder.diveTime.setText(diverObjectTask.getDiveTime());
holder.diverAttended.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v.findViewById(R.id.diver_attended_checkbox);
if (cb.isChecked()) {
itemChecked.set(position, true);
// do some operations here
} else if (!cb.isChecked()) {
itemChecked.set(position, false);
// do some operations here
}
}
});
holder.diverAttended.setChecked(itemChecked.get(position)); // this will Check or Uncheck the
holder.diveTime.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String txt = setDiveTimeDialog();
holder.diveTime.setText(txt);
mTasks.get(position).setCurrentText(txt); //add the setter to the current item's position
}
});
holder.diveTime.setText(diverObjectTask.getCurrentText());
return convertView;
}
static class ViewHolder {
CheckBox diverAttended;
EditText diveTime;
EditText depth;
}
private String setDiveTimeDialog() {
//final String[] items = finItems;
final String[] items = getContext().getResources().getStringArray(R.array.certification_level_items);
// Create list dialog with required parameters - context, title, and our array of items to fill the list.
CustomListDialog.Builder builder = new CustomListDialog.Builder(getContext(), "Dive Time", items);
// Now again we can use some extra methods on the builder to customise it more.
builder.titleAlignment(BaseDialog.Alignment.LEFT);
builder.itemAlignment(BaseDialog.Alignment.LEFT);
builder.titleColor(getContext().getResources().getColor(R.color.primary_color));
// Now we can build our dialog.
CustomListDialog customListDialog = builder.build();
// Finally we can show it.
customListDialog.show();
customListDialog.setListClickListener(new CustomListDialog.ListClickListener() {
@Override
public void onListItemSelected(int i, String[] strings, String s) {
result = s;
}
});
return result;
}
}
最佳答案
你应该这样做:
final DiveProfile diverObjectTask = mTasks.get(position);
holder.diveTime.setText(diverObjectTask.getDiveTie());
//also set your CheckBox value
这些值变为空,因为您没有在 getView
中设置它( getView
当列表滚动时自动被调用)
更新
看看你的问题,我认为最简单的方法是在DiveProfile
中创建新变量类,如boolean isSelected
和String currentText
.
之后,就不需要使用单独的列表,如itemChecked
。您可以get
和set
当前项目的值。
使用 getter
的示例:
holder.diverAttended.setChecked(mTasks.get(position).getSelected()); // getSelected is isSelected getter method
并调用setSelected
( setter
的 isSelected
)在您的 holder.diverAttended
中onClick
您的 EditText
的示例setter
:
holder.diveTime.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String txt = setDiveTimeDialog();
holder.diveTime.setText(txt);
mTasks.get(position).setcurrentText(txt); //add the setter to the current item's position
}
});
并调用getCurrentText()
在 getView
关于android - ListView 中的 EditText 在 ListView 中滚动时丢失内容,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27017196/