How to save spinner to saved/shared preferences

问题

I am able to save Strings in my saved preferences but having difficulty saving my spinner.

 public class Diet extends Activity {

  private SharedPreferences sharedPreferences;
  Spinner spnCalorieRange;

Here is my onCreate:

sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);

String strAge = Integer.toString(age);
String strHeight = Integer.toString(height);
String strWeight = Integer.toString(weight);

name = loadSavedPreference("name");
strAge = loadSavedPreference("strAge");
strHeight = loadSavedPreference("strHeight");
strWeight = loadSavedPreference("strWeight");

etName.setText(name);
etAge.setText(strAge);
etHeight.setText(strHeight);
etWeight.setText(strWeight);

This is my Spinner in my onCreate:

spinner = (Spinner)findViewById(R.id.spnCalorieRange); 
    adapter = ArrayAdapter.createFromResource(this, R.array.Calorie_Range, android.R.layout.simple_spinner_dropdown_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(adapter);

    spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> parent, View view,
                int position, long id) {
            long item = parent.getItemIdAtPosition(position);
            String pos =spinner.getSelectedItem().toString();
            //sharedPreferences.edit().putInt("PREF_SPINNER", position).commit();
            if (item == 0){
                deficitPercentage = .05;
            }
            else if (item ==1)
            {
                deficitPercentage = .1;
            }
            else if (item ==2)
            {
                deficitPercentage = .15;    
            }
            else if (item ==3)
            {
                deficitPercentage = .2;
            }
            else if (item ==4)
            {
                deficitPercentage = .25;
            }
            else
            {
                deficitPercentage = .3;
            }
            //editor.putString("pos", pos);
            //editor.commit();
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {
            // TODO Auto-generated method stub

        }

    });

This is in my onCLick behind a button, where I'm saving the strings and spinner

 age = (int) Double.parseDouble(etAge.getText().toString());
        height = (int) Double.parseDouble(etHeight.getText().toString());
        weight = (int) Double.parseDouble(etWeight.getText().toString());


        //Save Preferences
        String strAge = Integer.toString(age);
        String strHeight = Integer.toString(height);
        String strWeight = Integer.toString(weight);

        name = etName.getText().toString();
        savePreference("name",name);

        strAge = etAge.getText().toString();
        savePreference("strAge",strAge);

        strHeight = etHeight.getText().toString();
        savePreference("strHeight",strHeight);

        strWeight = etWeight.getText().toString();
        savePreference("strWeight",strWeight);:

回答1:

You can't save the actual spinner object to shared prefs, but you can save all of the values that make the spinner work its magic and next time you create the spinner, just apply those values

回答2:

In your onItemSelected place:

int spinnerPosition = spinner.getSelectedItemPosition();
saveSpinnerPosition(spinnerPosition);

Save method

public void saveSpinnerPosition(int position){
    sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
    SharedPreferences.Editor editor = sharedPreferences.edit();
    prefEditor.putInt("spnCalorieRange",position); 
    prefEditor.apply();
}

Load method

public void loadSpinnerPosition{
    sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
    int position= sharedPreferences .getInt"spnCalorieRange",-1);
    if(spinnerValue > -1)

    // set the value of the spinner 
    spinner.setSelection(position);
}

To put spinners back to position, call loadSpinnerPosition in your onCreate

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Edit:

because I noticed this post is also your question, u can also do everything at once:

At the top of your activity:

int spinnerPosition; 

In your onItemSelected place:

spinnerPosition = spinner.getSelectedItemPosition();

Save method

public void saveMethod(){
    sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.putBoolean("Gender", radioSexButton.isChecked());
    editor.putBoolean("Male", rdoMale.isChecked());
    prefEditor.putInt("spnCalorieRange",spinnerPosition); 
    prefEditor.apply();
}    

Load method

public void loadMethod(){
    sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
    int position= sharedPreferences .getInt"spnCalorieRange",-1);
    radioSexButton.setChecked(sharedPreferences.getBoolean("Gender", false)); 
    rdoMale.setChecked(sharedPreferences.getBoolean("Male", false));

    if(spinnerValue > -1)

    // set the value of the spinner 
    spinner.setSelection(position);
}

Then call saveMethod() when u want to save all your states, and call loadMethod() when u wanna load all your states

Should help u out

来源：https://stackoverflow.com/questions/35604579/how-to-save-spinner-to-saved-shared-preferences