Android SharedPreferences实现记住密码和自动登录界面
SharedPreferences介绍:
SharedPreferences是Android平台上一个轻量级的存储类,主要是保存一些常用的配置参数,它是采用xml文件存放数据的,文件存放在"/data/data<package name>/shared_prefs"目录下。
SharedPreferences的用法:
由于SharedPreferences是一个接口,而且在这个接口里没有提供写入数据和读取数据的能力。但它是通过其Editor接口中的一些方法来操作SharedPreference的,用法见下面代码:
Context.getSharedPreferences(String name,int mode)来得到一个SharedPreferences实例
name:是指文件名称,不需要加后缀.xml,系统会自动为我们添加上。
mode:是指定读写方式,其值有三种,分别为:
Context.MODE_PRIVATE:指定该SharedPreferences数据只能被本应用程序读、写
Context.MODE_WORLD_READABLE:指定该SharedPreferences数据能被其他应用程序读,但不能写
Context.MODE_WORLD_WRITEABLE:指定该SharedPreferences数据能被其他应用程序读写。
结果截图:
工程目录:
Java代码
LoginActivity.java
package com.liu.activity; import android.app.Activity; import android.app.backup.SharedPreferencesBackupHelper; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import android.os.Bundle; import android.text.Spannable; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.widget.Button; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.EditText; import android.widget.ImageButton; import android.widget.Toast; public class LoginActivity extends Activity { private EditText userName, password; private CheckBox rem_pw, auto_login; private Button btn_login; private ImageButton btnQuit; private String userNameValue,passwordValue; private SharedPreferences sp; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //去除标题 this.requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.login); //获得实例对象 sp = this.getSharedPreferences("userInfo", Context.MODE_WORLD_READABLE); userName = (EditText) findViewById(R.id.et_zh); password = (EditText) findViewById(R.id.et_mima); rem_pw = (CheckBox) findViewById(R.id.cb_mima); auto_login = (CheckBox) findViewById(R.id.cb_auto); btn_login = (Button) findViewById(R.id.btn_login); btnQuit = (ImageButton)findViewById(R.id.img_btn); //判断记住密码多选框的状态 if(sp.getBoolean("ISCHECK", false)) { //设置默认是记录密码状态 rem_pw.setChecked(true); userName.setText(sp.getString("USER_NAME", "")); password.setText(sp.getString("PASSWORD", "")); //判断自动登陆多选框状态 if(sp.getBoolean("AUTO_ISCHECK", false)) { //设置默认是自动登录状态 auto_login.setChecked(true); //跳转界面 Intent intent = new Intent(LoginActivity.this,LogoActivity.class); LoginActivity.this.startActivity(intent); } } // 登录监听事件 现在默认为用户名为:liu 密码:123 btn_login.setOnClickListener(new OnClickListener() { public void onClick(View v) { userNameValue = userName.getText().toString(); passwordValue = password.getText().toString(); if(userNameValue.equals("liu")&&passwordValue.equals("123")) { Toast.makeText(LoginActivity.this,"登录成功", Toast.LENGTH_SHORT).show(); //登录成功和记住密码框为选中状态才保存用户信息 if(rem_pw.isChecked()) { //记住用户名、密码、 Editor editor = sp.edit(); editor.putString("USER_NAME", userNameValue); editor.putString("PASSWORD",passwordValue); editor.commit(); } //跳转界面 Intent intent = new Intent(LoginActivity.this,LogoActivity.class); LoginActivity.this.startActivity(intent); //finish(); }else{ Toast.makeText(LoginActivity.this,"用户名或密码错误,请重新登录", Toast.LENGTH_LONG).show(); } } }); //监听记住密码多选框按钮事件 rem_pw.setOnCheckedChangeListener(new OnCheckedChangeListener() { public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) { if (rem_pw.isChecked()) { System.out.println("记住密码已选中"); sp.edit().putBoolean("ISCHECK", true).commit(); }else { System.out.println("记住密码没有选中"); sp.edit().putBoolean("ISCHECK", false).commit(); } } }); //监听自动登录多选框事件 auto_login.setOnCheckedChangeListener(new OnCheckedChangeListener() { public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) { if (auto_login.isChecked()) { System.out.println("自动登录已选中"); sp.edit().putBoolean("AUTO_ISCHECK", true).commit(); } else { System.out.println("自动登录没有选中"); sp.edit().putBoolean("AUTO_ISCHECK", false).commit(); } } }); btnQuit.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { finish(); } }); } }
LogoActivity.java
package com.liu.activity; import android.app.Activity; import android.content.Intent; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import android.opengl.ETC1; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.view.animation.AlphaAnimation; import android.view.animation.Animation; import android.view.animation.Animation.AnimationListener; import android.widget.Button; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.ProgressBar; public class LogoActivity extends Activity { private ProgressBar progressBar; private Button backButton; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // 去除标题 this.requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.logo); progressBar = (ProgressBar) findViewById(R.id.pgBar); backButton = (Button) findViewById(R.id.btn_back); Intent intent = new Intent(this, WelcomeAvtivity.class); LogoActivity.this.startActivity(intent); backButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { finish(); } }); } }
WelcomeActivity.java
package com.liu.activity; import android.app.Activity; import android.os.Bundle; public class WelcomeAvtivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.welcome); } }
布局文件:
login.xml文件
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/logo_bg" android:orientation="vertical" > <RelativeLayout android:layout_width="fill_parent" android:layout_height="wrap_content" > <ImageButton android:id="@+id/img_btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:background="@drawable/quit"/> <TextView android:id="@+id/tv_zh" android:layout_width="wrap_content" android:layout_height="35dip" android:layout_marginLeft="12dip" android:layout_marginTop="10dip" android:gravity="bottom" android:text="帐号:" android:textColor="#000000" android:textSize="18sp" /> <EditText android:id="@+id/et_zh" android:layout_width="fill_parent" android:layout_height="40dip" android:layout_below="@id/tv_zh" android:layout_marginLeft="12dip" android:layout_marginRight="10dip" /> <TextView android:id="@+id/tv_mima" android:layout_width="wrap_content" android:layout_height="35dip" android:layout_below="@id/et_zh" android:layout_marginLeft="12dip" android:layout_marginTop="10dip" android:gravity="bottom" android:text="密码:" android:textColor="#000000" android:textSize="18sp" /> <EditText android:id="@+id/et_mima" android:layout_width="fill_parent" android:layout_height="40dip" android:layout_below="@id/tv_mima" android:layout_marginLeft="12dip" android:layout_marginRight="10dip" android:maxLines="200" android:password="true" android:scrollHorizontally="true" /> <CheckBox android:id="@+id/cb_mima" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/et_mima" android:layout_marginLeft="12dip" android:text="记住密码" android:textColor="#000000" /> <CheckBox android:id="@+id/cb_auto" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/cb_mima" android:layout_marginLeft="12dip" android:text="自动登录" android:textColor="#000000" /> <Button android:id="@+id/btn_login" android:layout_width="80dip" android:layout_height="40dip" android:layout_below="@id/et_mima" android:layout_alignParentRight="true" android:layout_alignTop="@id/cb_auto" android:layout_marginRight="10dip" android:gravity="center" android:text="登录" android:textColor="#000000" android:textSize="18sp"/> </RelativeLayout> </LinearLayout>
logo.xml文件
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/logo_bg" android:orientation="vertical" > <RelativeLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="3"> <ProgressBar android:id="@+id/pgBar" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" /> <TextView android:id="@+id/tv1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/pgBar" android:layout_centerHorizontal="true" android:text="正在登录..." android:textColor="#000000" android:textSize="18sp" /> </RelativeLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:orientation="vertical" > <Button android:id="@+id/btn_back" android:layout_width="70dip" android:layout_height="35dip" android:text="取消" android:textColor="#000000" android:textSize="12sp" /> </LinearLayout> </LinearLayout>
welcome.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_gravity="center" android:background="@drawable/login_bg" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center" android:text="登陆成功,进入用户界面" android:textColor="#000000" android:textSize="20sp" /> </LinearLayout>
栏 目:Android代码
本文标题:Android SharedPreferences实现记住密码和自动登录界面
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