Android系列之实现自动登录和记住密码-蒲公英云

记住密码和自动登录是很多手机软件都有的一个功能。可以用 SharedPreferences类来轻松实现。 SharedPreferences是安卓平台的一个轻量级类。采用 SharedPreferences进行数据存储是很方便的。

public class LoginCheckActivity extends Activity implements OnClickListener{
    //登录按钮
    private Button loginButton;
    //账号文本框
    private EditText accountEditText;
    //密码文本框
    private EditText passwordEditText;
    //账号
    private String account;
    //密码
    private String password;
    private String accountValue;
    private String passwordValue;
    //进度条
    private ProgressDialog pd = null;
    //记住账号的CheckBox
    private CheckBox savedAccountCheckBox;
    //自动登录的CheckBox
    private CheckBox autoLoginCheckBox;
    //SharePreferences对象，用于记住账号
    private SharedPreferences sp;
    //记住账号的标志常数
    private final String MAK = "innoview";
    @SuppressWarnings("deprecation")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //设置标题不显示
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.login);
        //账号的文本框
        accountEditText = (EditText)this.findViewById(R.id.et_account);
        //密码的文本框
        passwordEditText = (EditText)this.findViewById(R.id.et_password);
        //保存账号的CheckBox
        savedAccountCheckBox = (CheckBox)findViewById(R.id.cb_savedAccount);
        //自动登录的CheckBox
        autoLoginCheckBox = (CheckBox)findViewById(R.id.cb_autoLogin);
        //获取保存在SharePreferences里面的账号信息，实现自动登录
        sp = getSharedPreferences("accountInfo",Context.MODE_WORLD_READABLE);
        if(sp.getBoolean("ISCHECK", false)){
            savedAccountCheckBox.setChecked(true);
            try{
                 accountValue = sp.getString("ACCOUNTVALUE","");
                 System.out.println("<<<<<<<<<<<<"+"账号"+accountValue);
            }catch (Exception e) {
                // TODO: handle exception
            }
            accountEditText.setText(account);
            try{
                 passwordValue = sp.getString("PASSWORDVALUE","");
                 System.out.println("<<<<<<<<<<<<"+"密码"+passwordValue);
            }catch (Exception e) {
                // TODO: handle exception
            }
            passwordEditText.setText(password);
            if(sp.getBoolean("AUTO_ISCHECK", false)){
                 autoLoginCheckBox.setChecked(true);
                 initLogin();
            }
        }
        savedAccountCheckBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
            if (savedAccountCheckBox.isChecked()) {
                System.out.println("记住账号框未选中状态");
                sp.edit().putBoolean("ISCHECK", true).commit();
            }else {
                System.out.println("记住账号框未选中");
                sp.edit().putBoolean("ISCHECK", false).commit();
            }
            }
        });
        autoLoginCheckBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
                if (autoLoginCheckBox.isChecked()) {
                    System.out.println("自动登录功能以启用");
                    sp.edit().putBoolean("AUTO_ISCHECK", true).commit();
                } else {
                    System.out.println("自动登录已关闭");
                    sp.edit().putBoolean("AUTO_ISCHECK", false).commit();
                }
            }
        });
        loginButton = (Button)findViewById(R.id.bt_login);
        loginButton.setOnClickListener(this);
    }
    /**
     * 重载的按钮点击事件
     */
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.bt_login:
            initLogin();
            break;
        default:
            break;
        }
    }   
    public void initLogin(){
        //显示进度条
        pd = new ProgressDialog(this);
        pd.setProgressStyle(ProgressDialog.STYLE_SPINNER);
        pd.setMessage("数据加载...");
        pd.show();
        account = accountEditText.getText().toString();
        password = passwordEditText.getText().toString();
        if(savedAccountCheckBox.isChecked())
        {
         Editor editor = sp.edit();
            try {
                editor.putString("ACCOUNTVALUE", account);
                System.out.println("<<<<<<<<"+"账号"+account);
            } catch (Exception e) {
                Toast.makeText(LoginCheckActivity.this,"账号保存异常",Toast.LENGTH_SHORT).show();
                e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
            }
            try {
                     editor.putString("PASSWORDVALUE", password);
                System.out.println("<<<<<<<<"+"密码"+password));
            } catch (Exception e) {
                Toast.makeText(LoginCheckActivity.this,"密码保存异常",Toast.LENGTH_SHORT).show();
                e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
            }
           editor.commit();
        }
        loginCheck(account, password);
    }
    /**
     * 登录验证
     * @param account 账号(学号)
     * @param password 密码
     */
    public void loginCheck(String account, String password){
        if(account.equals("admin")&&password.equals("123")){
            Intent intent = new Intent(LoginCheckActivity.this,MainActivity.class);
            startActivity(intent);
            LoginCheckActivity.this.finish();
        }
    }                                                                                                                         }