Android开发中，我们经常会用到SharedPreferences，它是一种轻量的数据存储方式，通常用来存储一些简单的配置信息（首次登陆 记住密码）

package com.example.day09_sp01;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.view.Menu;
import android.view.View;

public class MainActivity extends Activity {

	private SharedPreferences preferences;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		//获取sharedperfrence对象
		preferences = getSharedPreferences("name", MODE_PRIVATE);
		//取值
		boolean flag = preferences.getBoolean("flag", false);
		if(flag){
			Intent intent=new Intent(MainActivity.this, ShowActivity.class);
			startActivity(intent);
			finish();
		}
	}
	//点击存值
	public void click(View view){
		//获取编辑器
		Editor edit = preferences.edit();
		//存值
		edit.putBoolean("flag", true);
		//提交
		edit.commit();
		Intent intent=new Intent(MainActivity.this, ShowActivity.class);
		startActivity(intent);
		finish();
	}
}