登录注册并记住状态

点击由此页面调到登录页面 
public class HomeActivity extends FragmentActivity { 
List《Fragment》 list; 
ViewPager vp; 
RadioGroup rg; 
RadioButton rb1,rb2,rb3,rb4,rb5; 
Fragment_sy fragment_sy; 
Fragment_wt fragment_wt; 
Fragment_fl fragment_xx; 
Fragment_gwc fragment_gwc; 
Fragment_wd fragment_wd; 
SharedPreferences sp; 
boolean f; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
requestWindowFeature(Window.FEATURE_NO_TITLE);//去掉标题栏 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_home); 
sp=getSharedPreferences(“flags”,MODE_PRIVATE); 
f = sp.getBoolean(“f”, false); 
rg = (RadioGroup) findViewById(R.id.rg); 
rb1 = (RadioButton) findViewById(R.id.rb1); 
rb2 = (RadioButton) findViewById(R.id.rb2); 
rb3 = (RadioButton) findViewById(R.id.rb3); 
rb4 = (RadioButton) findViewById(R.id.rb4); 
rb5 = (RadioButton) findViewById(R.id.rb5); 
rg.check(R.id.rb1); 
fragment_sy=new Fragment_sy(); 
fragment_wt=new Fragment_wt(); 
fragment_xx=new Fragment_fl(); 
fragment_gwc=new Fragment_gwc(); 
fragment_wd=new Fragment_wd(); 
showFrag(R.id.fl,fragment_sy,”fragment_sy”); 
rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { 
@Override 
public void onCheckedChanged(RadioGroup radioGroup, int i) { 
switch (i) { 
case R.id.rb1: 
showFrag(R.id.fl,fragment_sy,”fragment_sy”); 
break; 
case R.id.rb2: 
showFrag(R.id.fl,fragment_wt,”fragment_wt”); 
break; 
case R.id.rb3: 
showFrag(R.id.fl,fragment_xx,”fragment_xx”); 
break; 
case R.id.rb4: 
showFrag(R.id.fl,fragment_gwc,”fragment_gwc”); 
if(f){ 
Toast.makeText(HomeActivity.this,”进入购物车”,Toast.LENGTH_SHORT).show(); 
}else{ 
Intent intent = new Intent(HomeActivity.this, LoginActivity.class); 
startActivity(intent); 
} 
break; 
case R.id.rb5: 
showFrag(R.id.fl,fragment_wd,”fragment_wd”); 
if(f){ 
Toast.makeText(HomeActivity.this,”进入我的”,Toast.LENGTH_SHORT).show(); 
}else{ 
Intent intent1 = new Intent(HomeActivity.this, LoginActivity.class); 
startActivity(intent1); 
} 
break; 
default: 
break; 
} 
} 
}); 
} 
private void showFrag(int id,Fragment frag,String tag){ 
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); 
Fragment fragment = getSupportFragmentManager().findFragmentByTag(tag); 
if(fragment==null){ 
transaction.add(id,frag,tag); 
} 
List list=getSupportFragmentManager().getFragments(); 
for(Fragment f:list){ 
transaction.hide(f); 
} 
transaction.show(frag); 
transaction.commit(); 
} 
private long exitTime = 0; 
@Override 
public boolean onKeyDown(int keyCode, KeyEvent event) { 
if (keyCode == KeyEvent.KEYCODE_BACK 
&& event.getAction() == KeyEvent.ACTION_DOWN) { 
if ((System.currentTimeMillis() - exitTime) > 2000) { 
Toast.makeText(HomeActivity.this,”再按一次退出程序”,Toast.LENGTH_SHORT).show(); 
exitTime = System.currentTimeMillis(); 
} else { 
finish(); 
System.exit(0); 
} 
return true; 
} 
return super.onKeyDown(keyCode, event); 
}

登录页面 
public class LoginActivity extends AppCompatActivity implements View.OnClickListener {

private Button mLoginBtn;private Button mZhuceBtn;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_login);    initView();}private void initView() {    mLoginBtn = (Button) findViewById(R.id.btn_login);    mLoginBtn.setOnClickListener(this);    mZhuceBtn = (Button) findViewById(R.id.btn_zhuce);    mZhuceBtn.setOnClickListener(this);}@Overridepublic void onClick(View v) {    switch (v.getId()) {        case R.id.btn_login:            Intent intent = new Intent(LoginActivity.this,MainActivity.class);            startActivity(intent);            break;        case R.id.btn_zhuce:            // TODO 17/10/20            Intent intent1 = new Intent(LoginActivity.this,ZhuceActivity.class);            startActivity(intent1);            break;        default:            break;    }}

}

注册页面 
public class ZhuceActivity extends AppCompatActivity implements View.OnClickListener {

private EditText mPhoneEt;private EditText mPassEt;private EditText mPass2Et;private Button mZhuceBtn;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_zhuce);    initView();}private void initView() {    mPhoneEt = (EditText) findViewById(R.id.et_phone);    mPassEt = (EditText) findViewById(R.id.et_pass);    mPass2Et = (EditText) findViewById(R.id.et_pass2);    mZhuceBtn = (Button) findViewById(R.id.btn_zhuce);    mZhuceBtn.setOnClickListener(this);}@Overridepublic void onClick(View v) {    switch (v.getId()) {        case R.id.btn_zhuce:            // TODO 17/10/20            String phone = mPhoneEt.getText().toString();            String pass = mPassEt.getText().toString();            String pass2 = mPass2Et.getText().toString();            CommonUser.userInfo=new UserInfo(phone,pass);            Log.i("========", ""+CommonUser.userInfo.getName()+CommonUser.userInfo.getPass());            Intent intent = new Intent(ZhuceActivity.this,LoginActivity.class);            startActivity(intent);            break;        default:            break;    }}

}

登录Presenter 
public class LoginPresenter { 
IUserLoginModel model; 
IUserLoginView view; 
Context context; 
SharedPreferences sp; 
SharedPreferences.Editor editor; 
boolean flag=false; 
public LoginPresenter(IUserLoginView view, Context context) { 
this.view = view; 
this.context = context; 
model = new UserLoginModel(context); 
sp=context.getSharedPreferences(“flags”,context.MODE_PRIVATE); 
editor = sp.edit(); 
} 
public void showUserInfo(){ 
UserInfo info = model.getUserInfo(); 
view.setTextName(info.getName()); 
view.setTextPass(info.getPass());

}public void savaUserInfo(){    String name = view.getTextName();    String pass = view.getTextPass();    model.saveUserInfo(name,pass);}public void login(){    final String name = view.getTextName();    final String pass = view.getTextPass();    final String name1 = CommonUser.userInfo.getName();    final String pass1 = CommonUser.userInfo.getPass();    Log.i("---------", "login: "+name1.toString()+pass1.toString());    if(name.equals("")||pass.equals("")){        Toast.makeText(context,"用户名或密码不能为空！",Toast.LENGTH_SHORT).show();        return;    }else if(!name.equals(name1)&&!pass.equals(pass1) ){        Toast.makeText(context,"用户名或密码错误！",Toast.LENGTH_SHORT).show();        return;    }else {        new AsyncTask<String ,String,String >(){            @Override            protected String doInBackground(String... strings) {                return null;            }            @Override            protected void onPostExecute(String s) {                super.onPostExecute(s);                model.saveUserInfo(pass1, name1);                Toast.makeText(context,"登陆成功",Toast.LENGTH_SHORT).show();                flag=true;                editor.putBoolean("f",true);                editor.commit();                Intent intent = new Intent(context, HomeActivity.class);                context.startActivity(intent);            }        }.execute();    }}

}

主页面 
public class MainActivity extends AppCompatActivity implements IUserLoginView{

Button btn;EditText et_name,et_pass;LoginPresenter presenter;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    requestWindowFeature(Window.FEATURE_NO_TITLE);    setContentView(R.layout.activity_main);    btn= (Button) findViewById(R.id.btn);    et_name = (EditText) findViewById(R.id.et_name);    et_pass = (EditText) findViewById(R.id.et_pass);    presenter = new LoginPresenter(this,this);    presenter.showUserInfo();    btn.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View view) {            presenter.login();        }    });}@Overridepublic void setTextName(String name) {    et_name.setText(name);}@Overridepublic void setTextPass(String pass) {    et_pass.setText(pass);}@Overridepublic String getTextName() {    return et_name.getText().toString();}@Overridepublic String getTextPass() {    return et_pass.getText().toString();}

}

Model

public interface IUserLoginModel { 
public void login(String name,String pass); 
public void saveUserInfo(String name,String pass); 
public UserInfo getUserInfo(); 
}

public class UserLoginModel implements IUserLoginModel{ 
Context context; 
SharedPreferences sp; 
SharedPreferences.Editor editor;

public UserLoginModel(Context context){    this.context = context;    sp=context.getSharedPreferences("user",Context.MODE_PRIVATE);    editor = sp.edit();}@Overridepublic void login(String name, String pass) {    NetUtils.getNetData();}@Overridepublic void saveUserInfo(String name, String pass) {    editor.putString("name",name);    editor.putString("pass",pass);    editor.commit();}@Overridepublic UserInfo getUserInfo() {    String name = sp.getString("name","");    String pass = sp.getString("pass","");    UserInfo user = new UserInfo(name,pass);    return user;}

}

View 
public interface IUserLoginView { 
public void setTextName(String name); 
public void setTextPass(String pass); 
public String getTextName(); 
public String getTextPass(); 
}