Android 实现记住用户名和密码的功能是通过SharedPreference 存储来实现的。创建一个复选按钮，通过按钮的否选取来进行事件处理。若按钮选中存储账号和密码的信息。若按钮没有选中，则清空账号和密码的信息。

结果演示：

源代码下载地址：

https://github.com/GXS1225/Android————-.git

分析

（1）判断是否输入了账号和密码

if(name.trim().equals("")){ Toast.makeText(this, "请您输入用户名！", Toast.LENGTH_SHORT).show(); return; } if(pswd.trim().equals("")){ Toast.makeText(this, "请您输入密码！", Toast.LENGTH_SHORT).show(); return; }

（2）在layout_main.xml定义一个 CheckBox，进行事件处理

//通过boolean CheckBoxLogin = checkbox.isChecked(); //按钮被选中，下次进入时会显示账号和密码 if (CheckBoxLogin) { Editor editor = sp.edit(); editor.putString("uname", name); editor.putString("upswd", pswd); editor.putBoolean("auto", true); editor.commit(); } //按钮被选中，清空账号和密码，下次进入时会显示账号和密码 else { Editor editor = sp.edit(); editor.putString("uname", null); editor.putString("upswd", null); editor.putBoolean("auto", false); editor.commit(); }

（3） SharedPreference 的存储实现

//先定义SharedPreferences sp = null; sp = this.getSharedPreferences("userinfo", Context.MODE_PRIVATE);//对uname 和 upswd 的操作 if (sp.getBoolean("checkboxBoolean", false)) { uname.setText(sp.getString("uname", null)); upswd.setText(sp.getString("upswd", null)); checkboxButton.setChecked(true); }

（4）跳转到Content.java界面

//Intent跳转Intent intent = new Intent(Welcome.this,Content.class);startActivity(intent);finish();

步骤：

先写一个登陆的界面： layout_main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:background="#ADD8E6"> <RelativeLayout android:id="@+id/login_div" android:layout_width="fill_parent" android:layout_height="221dp" android:layout_margin="15dip" android:background="@drawable/btn_bg" android:padding="15dip" > <TextView android:id="@+id/login_user_input" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_margin="5dp" android:text="@string/user" android:textSize="16dp" android:typeface="sans" /> <EditText android:id="@+id/user_input" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/login_user_input" android:background="@android:drawable/editbox_background" android:inputType="text" android:singleLine="true" /> <TextView android:id="@+id/login_pass_input" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/user_input" android:layout_margin="5dp" android:text="@string/pass" android:textSize="16dp" android:typeface="sans" /> <EditText android:id="@+id/pass_input" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/login_pass_input" android:background="@android:drawable/editbox_background" android:inputType="textPassword" android:singleLine="true" /> <CheckBox android:id="@+id/checkBoxLogin" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/pass_input" android:layout_alignParentBottom="true" android:text="@string/no_user" /> <Button android:id="@+id/new_user" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignRight="@+id/pass_input" android:layout_marginRight="28dp" android:onClick="To_Title" android:text="@string/new_user" /> </RelativeLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:layout_width="402dp" android:layout_height="51dp" android:layout_marginLeft="50dp" android:background="@drawable/gxs_ziti" /> <Button android:layout_width="120dp" android:layout_height="120dp" android:onClick="To_fruist" android:background="@drawable/gxs2" android:layout_marginLeft="80dp" /> </LinearLayout></LinearLayout>

Welcome.java

package com.gxs.login;import com.example.login.R;import com.gxs.listview.*;import android.os.Bundle;import android.preference.Preference;import android.app.Activity;import android.app.SearchManager.OnCancelListener;import android.content.Context;import android.content.Intent;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.util.Log;import android.view.Menu;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 Welcome extends Activity implements OnClickListener{ private EditText uname = null; private EditText upswd = null; private CheckBox checkboxButton = null; private Button login = null; SharedPreferences sp = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.layout_main); sp = this.getSharedPreferences("userinfo", Context.MODE_PRIVATE); init(); } public void init() { uname = (EditText) findViewById(R.id.user_input); upswd = (EditText) findViewById(R.id.pass_input); checkboxButton = (CheckBox) findViewById(R.id.checkBoxLogin); login = (Button) findViewById(R.id.new_user); if (sp.getBoolean("checkboxBoolean", false)) { uname.setText(sp.getString("uname", null)); upswd.setText(sp.getString("upswd", null)); checkboxButton.setChecked(true); } login.setOnClickListener(this); } @Override public void onClick(View v) { if (v == login){ String name = uname.getText().toString(); String pswd = upswd.getText().toString(); if(name.trim().equals("")){ Toast.makeText(this, "请您输入用户名！", Toast.LENGTH_SHORT).show(); return; } if(pswd.trim().equals("")){ Toast.makeText(this, "请您输入密码！", Toast.LENGTH_SHORT).show(); return; } boolean CheckBoxLogin = checkboxButton.isChecked(); if (CheckBoxLogin) { Editor editor = sp.edit(); editor.putString("uname", name); editor.putString("upswd", pswd); editor.putBoolean("checkboxBoolean", true); editor.commit(); } else { Editor editor = sp.edit(); editor.putString("uname", null); editor.putString("upswd", null); editor.putBoolean("checkboxBoolean", false); editor.commit(); } //Intent跳转 Intent intent=new Intent(Welcome.this,Content.class); startActivity(intent); finish(); } }}

Content.java

package com.gxs.listview;import java.util.List;import com.example.login.R;import com.gxs.*;import android.app.Activity;import android.os.Bundle;import android.widget.ArrayAdapter;import android.widget.ListView;public class Content extends Activity{ private ListView listview_fruits; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.content); }}

content.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".Welcome" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="内容" android:textAppearance="?android:attr/textAppearanceLarge" /></LinearLayout>

更多内容请参考专题：Android密码使用教程

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