LoginAvtivity如下:

   主要是sharedpreference和文本框.getText对于各个界面的密码用户名的保存和使用，还有就是状态的保存，第一次注册过就不能再注册.   其中我发现在一个活动中使用TextView,****比如TextView tv=(TextView)findViewById(R.id.tv);中即使你将TextView tv设置成public TextView tv;   在其他活动中也无法使用，这是因为TextView是在onCreate()方法中定义的,局部变量设置public,private之类的都是无效的.此时只能依赖preference。   public class LoginActivity extends Activity  implements OnClickListener{private Button loginButton;private Button registerButton;public EditText username;private EditText password;

// public SharedPreferences sp;
private String aString;
private String bString;
private SharedPreferences preferences;
private Editor editor;
private Boolean ab;

@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    requestWindowFeature(Window.FEATURE_NO_TITLE);    setContentView(R.layout.activity_login);    preferences = getSharedPreferences("config", MODE_PRIVATE);    editor = preferences.edit();    loginButton = (Button) findViewById(R.id.btn_login);    registerButton = (Button) findViewById(R.id.btn_register);    username = (EditText) findViewById(R.id.username);    password = (EditText) findViewById(R.id.password);    loginButton.setOnClickListener(this);    registerButton.setOnClickListener(this);    ab = preferences.getBoolean("ok", false);    aString = preferences.getString("YY", "");    bString = preferences.getString("LL", "");}

public void login(){
String aa=username.getText().toString();
String bb=password.getText().toString();
if (aa.equals(aString)&& bb.equals(bString)) {
Intent intent2=new Intent(LoginActivity.this,MainActivity.class);
startActivity(intent2);

}else {Intent intent = new Intent(LoginActivity.this,        AgainLoginActivity.class);        startActivity(intent);}

}

public void register(){    if (ab) {        Toast.makeText(getApplicationContext(), "你已经注册过了", 0).show();    }else {    Intent intent = new Intent(LoginActivity.this,            RegisterActivity.class);    startActivity(intent);    editor.putBoolean("ok",true);    editor.commit();    finish();    }}@Overridepublic void onClick(View v) {    switch (v.getId()) {    case R.id.btn_login:            login();        break;    case R.id.btn_register:            register();        break;    default:        break;    }}

}

register.java如下:

protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    requestWindowFeature(Window.FEATURE_NO_TITLE);    setContentView(R.layout.activity_register);    username = (EditText) findViewById(R.id.username);    password = (EditText) findViewById(R.id.password);    confirm_password = (EditText) findViewById(R.id.confirm_password);    registerButton = (Button) findViewById(R.id.btn_register);    registerButton.setOnClickListener(new OnClickListener() {        @Override        public void onClick(View arg0) {             yonghuming=username.getText().toString();             mima=password.getText().toString();            querenmima=confirm_password.getText().toString();            sp=getSharedPreferences("config", MODE_PRIVATE);              Editor editor=sp.edit();            editor.putString("YY", yonghuming);            editor.putString("LL", mima);            editor.commit();            if (!TextUtils.isEmpty(yonghuming)) {            if (mima.equals(querenmima)) {                register();            }            else{                Toast.makeText(getApplicationContext(), "两次密码不一致", Toast.LENGTH_LONG).show();               }        }            else {                Toast.makeText(getApplicationContext(), "用户名为空", 0).show();            }        }    });}public void register() {    Intent intent = new Intent(RegisterActivity.this,AgainLoginActivity.class);    startActivity(intent);    finish();}

}

AgainLoginAtivity.java如下:

public class AgainLoginActivity extends Activity implements OnClickListener{
private Button loginButton;
private Button registerButton;
public EditText username2;
public EditText password2;
public String mima2;
public String yonghuming2;
SharedPreferences sp;

@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    requestWindowFeature(Window.FEATURE_NO_TITLE);    setContentView(R.layout.activity_login2_again);    username2 = (EditText) findViewById(R.id.username2);    password2 = (EditText) findViewById(R.id.password2);    loginButton = (Button) findViewById(R.id.btn_login);    loginButton.setOnClickListener(this);}

public void login(){
mima2=password2.getText().toString();
yonghuming2=username2.getText().toString();
SharedPreferences preferences=getSharedPreferences(“config”, MODE_PRIVATE);
String name=preferences.getString(“YY”, “”);
String mimaa=preferences.getString(“LL”,”“);

if (yonghuming2.equals(name)) {    if (mima2.equals(mimaa)) {        Intent intent = new Intent(AgainLoginActivity.this,                MainActivity.class);        startActivity(intent);        finish();    }    else {        Toast.makeText(getApplicationContext(), "密码不同", Toast.LENGTH_SHORT).show();    }}else {    Toast.makeText(getApplicationContext(), "用户名不同", Toast.LENGTH_SHORT).show();}

}

@Overridepublic void onClick(View v) {    switch (v.getId()) {    case R.id.btn_login:            login();        break;    default:        break;    }}

}

Android简单登入注册界面的实现

LoginAvtivity如下:

register.java如下:

AgainLoginAtivity.java如下:

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