将Spinner值保存到SharedPreferences，然后将Spinner设置为保存的String

Question

我有一个名为strength的微调器，我需要获取它的值并将其保存到SharedPreferences。然后，当用户再次启动相同的活动（SaAStrength）时，需要将名为strength的微调器设置为他们已选择的活动。

我目前的代码没有将微调器设置为Prefs中保存的字符串。

我很失落如何处理这个问题。

package com.mikitz.rogsimple;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

public class SaAStrength extends Activity {

Spinner strength, melee, h2h, parry; 

SharedPreferences pref;

String getstrength, getmelee, geth2h, getparry; 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.saa_strength);
    pref = getSharedPreferences("Character1", Context.MODE_PRIVATE);

    strength = (Spinner) findViewById(R.id.strength);

    strength = (Spinner) findViewById(R.id.strength);
    Integer[] items1 = new Integer[]{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30};
    ArrayAdapter<Integer> adapter1 = new ArrayAdapter<Integer>(this,android.R.layout.simple_spinner_item, items1);
    strength.setAdapter(adapter1);

    melee = (Spinner) findViewById(R.id.melee);
    Integer[] items2 = new Integer[]{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30};
    ArrayAdapter<Integer> adapter2 = new ArrayAdapter<Integer>(this,android.R.layout.simple_spinner_item, items2);
    melee.setAdapter(adapter2);

    h2h = (Spinner) findViewById(R.id.h2h);
    Integer[] items3 = new Integer[]{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30};
    ArrayAdapter<Integer> adapter3 = new ArrayAdapter<Integer>(this,android.R.layout.simple_spinner_item, items3);
    h2h.setAdapter(adapter3);

    parry = (Spinner) findViewById(R.id.parry);
    Integer[] items4 = new Integer[]{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30};
    ArrayAdapter<Integer> adapter4 = new ArrayAdapter<Integer>(this,android.R.layout.simple_spinner_item, items4);
    parry.setAdapter(adapter4);

    getstrength = pref.getString("strength", "");
    strength.setSelection(((ArrayAdapter)strength.getAdapter()).getPosition(getstrength));
}

public void onBackPress()
{
    SharedPreferences.Editor editor=pref.edit();

    editor.putString("strength", strength.getSelectedItem().toString());

    editor.commit();

    Toast.makeText(this, "GREAT SUCCESS!!!!", Toast.LENGTH_LONG).show();

    Intent intent = new Intent (this, NewSkillsAndAttributes.class);
        startActivity(intent);
}
}