Saving the state of a single spinner with different uses

Question

Please i have a spinner in a CustomAdapterClass which extends ArrayAdapter. I want to save the state of the spinner even when the activity is destroyed. It is only one spinner that appears in a listview. I have searched but all i see is when there are more than one spinner, each having it's own id. How do i achieve this please. Here is my code

public class CustomListAdapterForCgpa extends ArrayAdapter<String> implements AdapterView.OnItemSelectedListener {

LinearLayout colorLayout;
TextView userGpScoreUneditable;
Spinner spinnerForGradePoints;
public String mathSubject= "Mathematics";
public String chemSubject = "Chemistry";
public String physicsSubject = "Physics";
public String biologySubject = "Biology";
public String gsSubject = "General Studies";
public String cscSubject = "CSC";
SharedPreferences sharedPreferences;
SharedPreferences.Editor editor;


public CustomListAdapterForCgpa(Context context, ArrayList<String> subjects) {
    super(context, R.layout.custom_list_view_cgpa, subjects);
}

@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {

}

@Override
public void onNothingSelected(AdapterView<?> adapterView) {

}

@NonNull
@Override
public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater layoutInflater = LayoutInflater.from(getContext());
    View customView = layoutInflater.inflate( R.layout.custom_list_view_cgpa,parent,false);

    String singleSubject = getItem(position);


    TextView singleText = (TextView) customView.findViewById(R.id.listSubjectsMyCoursesCgpa);
    colorLayout = (LinearLayout)customView.findViewById(R.id.colorForSubjectsCgpa);
    userGpScoreUneditable = (TextView)customView.findViewById(R.id.userGpScoreUneditable);
    spinnerForGradePoints = (Spinner)customView.findViewById(R.id.spinnerForGradePointCgpa);

    ArrayAdapter<String> gradePointAdapter = new ArrayAdapter<String>(getContext(), android.R.layout.simple_spinner_dropdown_item, TabFirstSemesterMyCGPA.userSubjectGrade);
    spinnerForGradePoints.setAdapter(gradePointAdapter);

    spinnerForGradePoints.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
            String selectedItem = adapterView.getItemAtPosition(i).toString();


            if (selectedItem.equals("A"))
            {
                Toast.makeText(getContext(), "You Clicked A", Toast.LENGTH_SHORT).show();
            }else if ( selectedItem.equals("B"))
            {
                Toast.makeText(getContext(), "You Clicked B", Toast.LENGTH_SHORT).show();

            }else if ( selectedItem.equals("C"))
            {
                Toast.makeText(getContext(), "You Clicked C", Toast.LENGTH_SHORT).show();

            }else if ( selectedItem.equals("D"))
            {
                Toast.makeText(getContext(), "You Clicked D", Toast.LENGTH_SHORT).show();


            }else if ( selectedItem.equals("E"))
            {
                Toast.makeText(getContext(), "You Clicked E", Toast.LENGTH_SHORT).show();

            }else if ( selectedItem.equals("F"))
            {
                Toast.makeText(getContext(), "You Clicked F", Toast.LENGTH_SHORT).show();

            }

        }

        @Override
        public void onNothingSelected(AdapterView<?> adapterView) {

        }
    });


    singleText.setText(singleSubject);
    colorLayout.setBackgroundColor(UserCourseSelection2.userSubjectsListColor.get(position));



    return customView;
   }
  }

score 0 · Answer 1 · answered Apr 07 '17 at 16:19

0

In pure Java you could save the state as a static field. The value will persist after the activity is destroyed because it belongs to the Class, not an instance. It should work the same in Android.

answered Apr 07 '17 at 16:19

BinaryDigit09

110
10

the right way to do this on Android is using `SharedPreferences`. http://stackoverflow.com/questions/2475978/using-static-variables-in-android explains that static variables are associated with the ClassLoader, which is reclaimed when the app is finally destroyed - in other words if you use statics this way, you'll still need to persist and restore those values somehow. – trooper Apr 07 '17 at 16:39
So does anyone have any idea how i will go about this – Emmanuel Okocha Apr 08 '17 at 08:06

Saving the state of a single spinner with different uses

1 Answers1