This question might already be existent in StackOverflow, but I was unable to find it because I was not sure how to describe this scenario with the exact wordings, therefore I thought I should rather ask a new question and describe it here.
I have a ListView in my main activity. Each item on the ListView contains a button that is visible by default, and a textbox which is invisible by default. Once I click the button, it will be disappeared, and the textbox will be visible with a message - "Activated by currentUser". Additionally, this message will be stored in the database. This is separate from the listitem onclick event as can be noticed from my code.
Problem is, I am not being able to retain the state of the ListView items if I restart my app. Suppose, I have 4 items in my ListView. For 2 items, I have clicked only the button, and after that the button is disappeared and the textbox with "Activated by currentUser" appears. However, if I restart my app, the button appears again, and the textbox is vanished.
The app is connected to a MEAN Stack web application, so any update or delete operation will affect the main MEAN Stack application.
Here is my custom adapter code:
import com.elegantcab.getcabgo.utils.QueryUtils;
public class CabDriverNotificationAdapter extends ArrayAdapter<CabDriverNotification> {
private SessionManager mSession;
private String mNotificationId;
private String mMemo;
private static final String DATE_FORMAT = "LLL dd, yyyy";
private static final String TIME_FORMAT = "h:mm a";
public CabDriverNotificationAdapter(Context context, List<CabDriverNotification> notifications) {
super(context, 0, notifications);
/** The static holder class will act as a holder for Android.Widget items
* such as the activated by textview and the activate button **/
public static class ViewHolder{
LinearLayout _layout;
TextView _acceptedBy;
Button acceptButton;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View listItemView = convertView;
final ViewHolder holder;
mSession = new SessionManager(getContext());
final CabDriverNotification currentNotification = getItem(position);
// get the id of current notification
mNotificationId = String.valueOf(currentNotification.getObjectId());
if (listItemView == null) {
listItemView = LayoutInflater.from(getContext()).inflate(
R.layout.notification_list_item, parent, false);
holder = new ViewHolder();
holder._layout = (LinearLayout) listItemView.findViewById(R.id.activate_layout);
holder._activatedBy = (TextView) listItemView.findViewById(R.id.activated_by_message);
holder.activateButton = (Button) listItemView.findViewById(R.id.activate_button);
listItemView.setTag(holder);
//onClickListener for activate button
holder.activateButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mMemo = toggleActivaionStatus(holder, mNotificationId);
QueryUtils.updateNotification(getContext(), new SessionManager(getContext()).getNotificationUrl(), mNotificationId, mMemo;
}
});
}
else {
holder = (ViewHolder) listItemView.getTag();
holder._activatedBy = (TextView) listItemView.findViewById(R.id.activated_by_message);
holder.activateButton = (Button) listItemView.findViewById(R.id.activate_button);
if(currentNotification.getMemo().contains("Activated by")){
holder._activatedBy.setText(currentNotification.getMemo());
holder._activatedBy.setVisibility(View.VISIBLE);
holder.activateButton.setVisibility(View.GONE);
}
else{
holder._activatedBy.setVisibility(View.GONE);
holder.activateButton.setVisibility(View.VISIBLE);
holder.activateButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mMemo = toggleActivateStatus(holder, mNotificationId);
QueryUtils.updateNotification(getContext(), new SessionManager(getContext()).getNotificationUrl(), mNotificationId, mMemo);
}
});
}
}
// Create full name from first and last name
String fullName = currentNotification.getFirstname() + " " + currentNotification.getLastname();
// Find the TextView with view ID name
TextView nameView = (TextView) listItemView.findViewById(R.id.name);
// Display the name in that TextView
nameView.setText(fullName);
// Create a new Date object from the time in milliseconds of the notification
Date dateObject = new Date(currentNotification.getTimeInMilliseconds());
// Find the TextView with view ID date
TextView dateView = (TextView) listItemView.findViewById(R.id.date);
// Format the date string (i.e. "Mar 3, 1984")
final String formattedDate = formatDate(dateObject);
// Display the date of the current notification in that TextView
dateView.setText(formattedDate);
// Find the TextView with view ID time
TextView timeView = (TextView) listItemView.findViewById(R.id.time);
// Format the time string (i.e. "4:30PM")
final String formattedTime = formatTime(dateObject);
// Display the time of the current notification in that TextView
timeView.setText(formattedTime);
// attach a listener to the list item that will display the item detail when clicked
listItemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Context context = v.getContext();
Intent intent = new Intent(context, NotificationDetailActivity.class);
intent.putExtra(NotificationDetailActivity.ARG_NOTIFICATION_ID, String.valueOf(currentNotification.getObjectId()));
intent.putExtra(NotificationDetailActivity.ARG_NOTIFICATION_DATE, formattedDate);
intent.putExtra(NotificationDetailActivity.ARG_NOTIFICATION_TIME, formattedTime);
context.startActivity(intent);
}
});
// Return the list item view that is now showing the appropriate data
return listItemView;
}
private String toggleActivateStatus(ViewHolder vHolder, String nid){
HashMap<String, String> currentUser = mSession.getUserDetails();
String user = currentUser.get("username");
String message = "Activated by" + " " + user;
vHolder._activatedBy.setText(message);
vHolder._activatedBy.setVisibility(View.VISIBLE);
vHolder.activateButton.setVisibility(View.GONE);
return message;
}
}
Inside onCreate of Main Activity:
final ListView notificationListView = (ListView) findViewById(R.id.list);
mAdapter = new CabDriverNotificationAdapter(this, new ArrayList<CabDriverNotification>());
notificationListView.setAdapter(mAdapter);
The notification_list_item.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="@dimen/notification_activity_margin"
android:layout_marginStart="@dimen/notification_activity_margin"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="end"
android:fontFamily="sans-serif-medium"
android:maxLines="1"
android:textAllCaps="true"
android:textColor="@color/textColorNotificationDetails"
android:textSize="@dimen/notification_small_text_size"
tools:text="@string/notification_item_name_default" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_margin="@dimen/notification_activity_margin"
android:orientation="vertical">
<TextView
android:id="@+id/date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:textColor="@color/textColorNotificationDetails"
android:textSize="@dimen/notification_small_text_size"
tools:text="@string/notification_detail_date_default" />
<TextView
android:id="@+id/time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:textColor="@color/textColorNotificationDetails"
android:textSize="@dimen/notification_small_text_size"
tools:text="@string/notification_detail_time_default" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/accept_layout"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/activated_by_message"
android:textColor="@color/colorPrimary"
android:text=""
android:visibility="invisible"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/activate_button"
android:layout_gravity="center_horizontal"
android:text="Activate Driver"
android:background="@color/colorAccent"/>
</LinearLayout>
I want to retain the state of my ListView item after app restart, that said, if I have already activated two items, they should have the textbox with the message "Activated by currentUser" visible instead of the button.
