Android：利用SharedPreferences实现自动登录

来源：互联网发布：c语言n次方编辑：程序博客网时间：2024/05/29 19:36

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>

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