SharedPreferences存储

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界面有【写入数据】和【读取数据】两个按钮

程序代码如下：

package com.twac.sharedpreferancestests;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Random;import android.app.Activity;import android.content.SharedPreferences;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class MainActivity extends Activity {private Button btn_save;private Button btn_load;private SharedPreferences preferences;private SharedPreferences.Editor editor;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btn_save = (Button) findViewById(R.id.btn_save);btn_load = (Button) findViewById(R.id.btn_load);// 获取只能被本应用程序读写的sharedpreferances对象preferences = getSharedPreferences("twac", MODE_PRIVATE);editor = preferences.edit();// 写入数据btn_save.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy 年 MM 月 dd 日"+ "hh:mm:ss");int randomNumber = (int) (Math.random() * 1000);editor.putString("date", sdf.format(new Date()));editor.putInt("randomNumber", randomNumber);editor.commit();Toast.makeText(MainActivity.this, "数据写入成功", Toast.LENGTH_LONG).show();}});// 读出数据btn_load.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {String date = preferences.getString("date", null);int randomNumber = preferences.getInt("randomNumber", 0);String message = date == null ? "数据还未写入" : "写入时间为:" + date+ "\n 写入的随机数为：" + randomNumber;// 使用toast显示信息Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();}});}}

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