本文介绍了Android：利用SharedPreferences实现自动登录，具体如下：

主要代码：

public class LoginActivity extends Activity { private EditText username; private EditText userpassword; private CheckBox remember; private CheckBox autologin; private Button login; private SharedPreferences sp; private String userNameValue,passwordValue; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.login); // 初始化用户名、密码、记住密码、自动登录、登录按钮 username = (EditText) findViewById(R.id.username); userpassword = (EditText) findViewById(R.id.userpassword); remember = (CheckBox) findViewById(R.id.remember); autologin = (CheckBox) findViewById(R.id.autologin); login = (Button) findViewById(R.id.login); sp = getSharedPreferences("userInfo", 0); String name=sp.getString("USER_NAME", ""); String pass =sp.getString("PASSWORD", ""); boolean choseRemember =sp.getBoolean("remember", false); boolean choseAutoLogin =sp.getBoolean("autologin", false); // Toast.makeText(this, name, Toast.LENGTH_SHORT).show(); //如果上次选了记住密码，那进入登录页面也自动勾选记住密码，并填上用户名和密码 if(choseRemember){ username.setText(name); userpassword.setText(pass); remember.setChecked(true); } //如果上次登录选了自动登录，那进入登录页面也自动勾选自动登录 if(choseAutoLogin){ autologin.setChecked(true); } login.setOnClickListener(new OnClickListener() { // 默认可登录帐号tinyphp,密码123 @Override public void onClick(View arg0) { userNameValue = username.getText().toString(); passwordValue = userpassword.getText().toString(); SharedPreferences.Editor editor =sp.edit(); // TODO Auto-generated method stub if (userNameValue.equals("tinyphp") && passwordValue.equals("123")) { Toast.makeText(LoginActivity.this, "登录成功", Toast.LENGTH_SHORT).show(); //保存用户名和密码 editor.putString("USER_NAME", userNameValue); editor.putString("PASSWORD", passwordValue); //是否记住密码 if(remember.isChecked()){ editor.putBoolean("remember", true); }else{ editor.putBoolean("remember", false); } //是否自动登录 if(autologin.isChecked()){ editor.putBoolean("autologin", true); }else{ editor.putBoolean("autologin", false); } editor.commit(); //跳转 Intent intent =new Intent(LoginActivity.this,SuccessActivity.class); startActivity(intent); } else { Toast.makeText(LoginActivity.this, "用户名或密码错误，请重新登录!", Toast.LENGTH_SHORT).show(); } } }); }}

<?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:padding="10dp" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="用户名：" /> <EditText android:id="@+id/username" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" android:inputType="textPersonName" > </EditText> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:text="密码：" /> <EditText android:id="@+id/userpassword" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" android:inputType="textPassword" > </EditText> <CheckBox android:id="@+id/remember" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="记住密码" /> <CheckBox android:id="@+id/autologin" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="自动登录" /> <Button android:id="@+id/login" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="登录" /></LinearLayout>

源码下载：源码

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