前段时间傻乎乎的用sqllite来保存用户的记住密码，用sqlite是可以保存，但当时用时就感觉怪怪的，那时候还不知道SharedPreferences，我们在网頁上的话，一般都是用cookies来保存的，Android的话应该用这个来保存的比较多。我的个人感觉SharedPreferences要比我之前那个要好的多了。
MainActivity.java
public class MainActivity extends Activity {
PreferencesService service;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
service=new PreferencesService(this);
save();
}
void save(){
service.save("caibinsong",21);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
PreferencesService.java
package com.example.sharedpreferences;
import java.util.HashMap;
import java.util.Map;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
public class PreferencesService {
private Context context;
public PreferencesService(Context context){
this.context=context;
}
/*
* 保存name和age
* */
public void save(String name,Integer age){
SharedPreferences preferences =context.getSharedPreferences("itcast", Context.MODE_PRIVATE);
Editor editor =preferences.edit();
editor.putString("name",name);
editor.putInt("age", age);
editor.commit();
}
/*
* 获取值
* */
public Map<String ,String> getPreferences(){
Map<String,String> params=new HashMap<String,String>();
SharedPreferences preferences=context.getSharedPreferences("itcast", Context.MODE_PRIVATE);
params.put("name", preferences.getString("name", ""));
params.put("age", String.valueOf(preferences.getInt("age", 0)));
return params;
}
}