[英]RadioButton checked sate automatically changes on scrolling event of RecyclerView
我在RecyclerView项目中的RadioButton遇到问题。 根据“类型”,我更改了选中的RadioButton。 但是,在加载所有数据之后,当我单击非选中单选按钮时,它就会被选中。 但是在滚动了我刚刚单击的选中的单选按钮后,该复选框未选中。 我要检查刚刚单击的按钮。 但是它不会保持选中状态。 我如何得到想要的东西? 谁能帮帮我吗!!!!!!!
这是我的适配器类:
public class AttendanceAdapterLocal extends RecyclerView.Adapter<AttendanceAdapterLocal.ViewHolder>{
private ArrayList<StudentAttendance> attendanceArrayList;
private Context context;
public AttendanceAdapterLocal(ArrayList<StudentAttendance> attendanceArrayList) {
this.attendanceArrayList = attendanceArrayList;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item_mark_attendance, viewGroup, false);
context = viewGroup.getContext();
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull final ViewHolder viewHolder, int i) {
final String type = attendanceArrayList.get(i).getType();
final String id = attendanceArrayList.get(i).getId();
final String name = attendanceArrayList.get(i).getName();
final String roll = attendanceArrayList.get(i).getRoll();
viewHolder.setData(name, roll, type, id);
final DatabaseHelper databaseHelper = new DatabaseHelper(context);
final User user = new AccessStorage(context).getUserDetails();
final String userId = user.getUserId();
viewHolder.radioPresent.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (databaseHelper.updateStudentAttendanceData(id, userId, "P", "0") > 0) {
Toast.makeText(context, "Marked successfully.", Toast.LENGTH_LONG).show();
viewHolder.radioPresent.setChecked(true);
} else {
Toast.makeText(context, "Unable to mark attendance.", Toast.LENGTH_LONG).show();
}
}
});
viewHolder.radioAbsent.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (databaseHelper.updateStudentAttendanceData(id, userId, "A", "0") > 0) {
Toast.makeText(context, "Marked successfully.", Toast.LENGTH_LONG).show();
viewHolder.radioAbsent.setChecked(true);
} else {
Toast.makeText(context, "Unable to mark attendance.", Toast.LENGTH_LONG).show();
}
}
});
viewHolder.radioNone.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (databaseHelper.updateStudentAttendanceData(id, userId, "NA", "0") > 0) {
Toast.makeText(context, "Marked successfully.", Toast.LENGTH_LONG).show();
viewHolder.radioNone.setChecked(true);
} else {
Toast.makeText(context, "Unable to mark attendance.", Toast.LENGTH_LONG).show();
}
}
});
}
@Override
public int getItemCount() {
return attendanceArrayList.size();
}
@Override
public int getItemViewType(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
public class ViewHolder extends RecyclerView.ViewHolder {
// Widgets
private TextView textName;
private RadioGroup radioGroup;
private RadioButton radioPresent, radioAbsent, radioNone;
// Vars
private View view;
public ViewHolder(@NonNull View itemView) {
super(itemView);
view = itemView;
textName = view.findViewById(R.id.textName);
radioGroup = view.findViewById(R.id.radioGroup);
radioPresent = view.findViewById(R.id.radioPresent);
radioAbsent = view.findViewById(R.id.radioAbsent);
radioNone = view.findViewById(R.id.radioNone);
}
private void setData(String name, String roll, final String type, final String id) {
textName.setText(roll + ". " + name);
if (type.equals("P")) {
radioPresent.setChecked(true);
} else if(type.equals("A")) {
radioAbsent.setChecked(true);
}else if(type.equals("NA")) {
radioNone.setChecked(true);
}
}
}
}
只是一个小错误。 在您的onClick方法中,更改状态时只需通知适配器即可。
@Override
public void onClick(View v) {
if (databaseHelper.updateStudentAttendanceData(id, userId, "P", "0") > 0) {
Toast.makeText(context, "Marked successfully.", Toast.LENGTH_LONG).show();
viewHolder.radioPresent.setChecked(true);
//Notify adapter
attendanceArrayList.notify();
} else {
Toast.makeText(context, "Unable to mark attendance.", Toast.LENGTH_LONG).show();
}
}
我可以看到,无论您做过同样的事情,在更改列表中的任何内容时通知适配器都是很重要的。 您可以使用notifyDataSetChanged()或notifyItemChanged(selectedPosition);
如果仍然遇到问题,则应创建一个Model类。
单击单选按钮上的“使用接口”,在要在回收器视图(内部活动)中传递的原始列表中进行必要的更改,然后使用notifiDataSetChanged()方法。
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