Android实验9--Android数据存储及IO答案.doc

一、 二、实验日期： 三、实验目的： 1、了解SharedPreferences的存储数据的格式及位置，能够读写其他应用程序的SharedPreferences。 2、 3、 四、：Windows+Eclipse+jdk+sdk+adt 五、 1、读写其他应用程序SharedPreferences。 Week09_01_01Activity.java package com.week09.lab01_01; import com.week09.lab01.R; import android.app.Activity; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import android.os.Bundle; import android.widget.TextView; public class Week09_01_01Activity extends Activity { SharedPreferences preferences; TextView show; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); show=(TextView)findViewById(R.id.show); preferences = getSharedPreferences(count, MODE_WORLD_READABLE); //读取SharedPreferences里的count数据 int count = preferences.getInt(count , 0); //显示程序以前使用的次数 show.setText(程序以前被使用了+count+次。); Editor editor = preferences.edit(); //存入数据 editor.putInt(count , ++count); //提交修改 mit(); } } Week09_01_02Activity.java package com.week09.lab01_02; import android.app.Activity; import android.content.Context; import android.content.SharedPreferences; import android.content.pm.PackageManager.NameNotFoundException; import android.os.Bundle; import android.widget.TextView; public class Week09_01_02Activity extends Activity { public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); TextView show = (TextView) findViewById(R.id.show); Context useCount = null; try{ // 获取其他程序所对应的Context useCount = createPackageContext(com.week09.lab01_01, Context.CONTEXT_IGNORE_SECURITY); System.out.println(useCount); } catch (NameNotFoundException e){ e.printStackTrace(); } // 使用其他程序的Context获取对应的SharedPreferences SharedPreferences prefs =useCount.getSharedPreferences(count, Context.MODE_WORLD_READA