android SharedPreferences 的使用

package com.yek;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MyShared extends Activity {//SharedPreferences的创建、写数据、取数据
    /** Called when the activity is first created. */
 SharedPreferences sp;
 SharedPreferences.Editor editor;
 Context context;
 String name;
 Button mybutton;
 TextView mytext;
 EditText username;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        mybutton = (Button)findViewById(R.id.mybutton);
        mytext = (TextView)findViewById(R.id.mytext);
        username = (EditText)findViewById(R.id.myedit);
        SharedPreferencesHelper(this, "myShared");
        mybutton.setOnClickListener(new View.OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    String inputname = username.getText().toString();
    putValue("name", inputname);
       name = getValue("name");
       if(name.equals("")){
        mytext.setBackgroundColor(Color.WHITE);
        mytext.setText("你还没输入武将姓名");
       }else{
        mytext.setBackgroundColor(Color.WHITE);
        mytext.setText("你输入的武将为："+name);
       }
   }
        });
    }
   
    public void SharedPreferencesHelper(Context c, String name){//创建
     this.context = c;
     sp = context.getSharedPreferences(name, 0);
     editor = sp.edit();
    }
   
    public void putValue(String key, String value){//写数据
     editor = sp.edit();
     editor.putString(key, value);
     editor.commit();
    }
   
    public String getValue(String key){                   //取值
     return sp.getString(key, null);//有值的话取出值，没有的话就返回null
    }
}

 

 

 

xml代码：

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<EditText
    android:id="@+id/myedit"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:hint="请输入武将的姓名"
    android:textSize="17dip"
    android:textColor="#00BFFF"
    />
<RelativeLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center_horizontal">
<Button 
    android:id="@+id/mybutton"
    android:layout_width="200dip"
    android:layout_height="wrap_content"
    android:text="点击获得武将的姓名"
    android:textSize="17dip"
    android:textColor="#00BFFF"
    />
</RelativeLayout>
   
<TextView
    android:id="@+id/mytext"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="17dip"
    android:textColor="#00BFFF"
    />
</LinearLayout>