android SharedPreferences实现用户的注册和保存账号密码

在android开发中，我们做用户登录和注册的时候需要将用户名和密码保存,下次打开的时候记住应户名和密码。关于注册保存用户密码的方式和记住用户名和密码的保存方式有多种，这里介绍SharaedPreferenses保存方式。SharaedPreferenses是使用键值对的方式来存储数据的，它的本质是基于XML文件存储key-value键值对数据，通常用来存储一些简单的配置信息。其存储位置在/data/data/<包名>/shared_prefs目录下。

下面就通过一个小例子来实现这两项功能

1、注册的功能

布局文件

package com.example.sharepreferences;import android.app.Activity;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.nfc.Tag;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;public class RegisteActivity extends Activity {private Button button;//private Button readButton;private EditText account;private EditText password;String TAG = "MainActivity";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button = (Button) findViewById(R.id.button);account = (EditText) findViewById(R.id.account);password = (EditText) findViewById(R.id.passeord);button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubSharedPreferences.Editor editor = getSharedPreferences("data", MODE_PRIVATE).edit();editor.putString("name", account.getText().toString());editor.putString("password", password.getText().toString());editor.commit();finish();}});}}

这样数据就保存成功了。

2、实现对用户名和密码的保存

Activity

package com.example.sharepreferences;import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;public class LoginActivity extends Activity{private EditText accountEdit;private EditText passwordEdit;private Button login;private SharedPreferences pref;private SharedPreferences.Editor editor;private CheckBox rememberpass;private Button registe;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.login);accountEdit = (EditText) findViewById(R.id.account);passwordEdit = (EditText) findViewById(R.id.passeord);login = (Button) findViewById(R.id.login);rememberpass = (CheckBox) findViewById(R.id.remember_password);registe = (Button) findViewById(R.id.registe);registe.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubIntent intent = new Intent(LoginActivity.this, RegisteActivity.class);startActivity(intent);}});pref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());boolean isRemember = pref.getBoolean("remember_password", false);if(isRemember){//将账号和密码都设置在文本框内String account = pref.getString("account", "");String password = pref.getString("password", "");accountEdit.setText(account);passwordEdit.setText(password);rememberpass.setChecked(true);}login.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubString account = accountEdit.getText().toString();String password = passwordEdit.getText().toString();SharedPreferences pre = getSharedPreferences("data", MODE_PRIVATE);if(account.equals(pre.getString("name", ""))&&password.equals(pre.getString("password", ""))){editor = pref.edit();if (rememberpass.isChecked()) {editor.putBoolean("remember_password", true);}else{editor.clear();}editor.commit();Intent intent = new Intent(LoginActivity.this, Mainactivity.class);startActivity(intent);finish();}else {Toast.makeText(LoginActivity.this, "用户名或密码不对", Toast.LENGTH_LONG).show();}}});}}

本文来自互联网用户投稿，文章观点仅代表作者本人，不代表本站立场，不承担相关法律责任。如若转载，请注明出处。 如若内容造成侵权/违法违规/事实不符，请点击【内容举报】进行投诉反馈！