（2）MainActivity.java
package com.example.testsharedpreferences;
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
/**
* Android 持久化技术-----SharedPreferences存储
* @author yy
*
*/
public class MainActivity extends Activity {
private EditText accountEdit;
private EditText passwordEdit;
private Button saveButton;
private Button restoreButton;
private SharedPreferences pref;
private SharedPreferences.Editor editor;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//存储按钮
saveButton = (Button) findViewById(R.id.login);
//为存储按钮添加点击事件
saveButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
//获取SharedPreferences对象
//第一个参数：文件名，没有则新建。第二个参数：写入模式-覆盖
pref = getSharedPreferences("second", MODE_PRIVATE);
//获取SharedPreferences.Editor对象
editor = pref.edit();
//获取输入的账号内容
accountEdit = (EditText) findViewById(R.id.account);
String account = accountEdit.getText().toString();
//获取输入的密码内容
passwordEdit = (EditText) findViewById(R.id.password);
String password = passwordEdit.getText().toString();
//存储用户名和密码
editor.putString("account", account);
editor.putString("password", password);
//提交
editor.commit();
Toast.makeText(getApplicationContext(), "保存成功", Toast.LENGTH_SHORT).show();
}
});
//获取恢复按钮对象
restoreButton = (Button) findViewById(R.id.login2);
//添加事件
restoreButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
//获取SharedPreference对象
pref = getSharedPreferences("second", MODE_PRIVATE);
//读取内容
String account = pref.getString("account", "this is default value");
String password = pref.getString("password", "this is default value");
//设置到响应位置
EditText editText2 = (EditText)findViewById(R.id.account2);
editText2.setText(account);
EditText passwordText2 = (EditText) findViewById(R.id.password2);
passwordText2.setText(password);
Toast.makeText(getApplicationContext(), "恢复成功", Toast.LENGTH_SHORT).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
