android中保存一个ArrayList到SharedPreferences的方法

private static SharedPreferences getSp()
{
if (Application.getContext() == null)
return null;
if (sharedPreferences == null)
sharedPreferences = Application.getContext().getSharedPreferences("key", Context.MODE_PRIVATE);
return sharedPreferences;
}

public static void setArray(String key,ArrayList<String> sArray) {
SharedPreferences.Editor mEdit1= getSp().edit();
mEdit1.putInt(key+"_size",sArray.size());
for(int i=0;i<sArray.size();i++) {
mEdit1.remove(key+"_" + i);
mEdit1.putString(key+"_" + i, sArray.get(i));
}
mEdit1.commit();
}

public static ArrayList<String> getArray(String key) {
SharedPreferences mSp= getSp();
ArrayList<String> sArray = new ArrayList<String>();
int size = mSp.getInt(key+"_size",0);
for(int i=0;i<size;i++) {
sArray.add(mSp.getString(key+"_" + i, null));
}
return sArray;
}