Android答题APP的设计与实现

//****连接数据库**DBManager***public class DBManager { // 数据库连接常量 public static final String DRIVER = "com.mysql.jdbc.Driver"; public static final String USER = "root"; public static final String PASS = "root"; public static final String URL = "jdbc:mysql://localhost:3306/shop"; // 静态成员，支持单态模式 private static DBManager per = null; private Connection conn = null; private Statement stmt = null; // 单态模式-懒汉模式 private DBManager() { } public static DBManager createInstance() {  if (per == null) {   per = new DBManager();   per.initDB();  }  return per; } // 加载驱动 public void initDB() {  try {   Class.forName("com.mysql.jdbc.Driver");  } catch (Exception e) {   e.printStackTrace();  } } // 连接数据库，获取句柄+对象 public void connectDB() {  System.out.println("Connecting to database...");  try {   conn = DriverManager.getConnection(URL, USER, PASS);   stmt = conn.createStatement();  } catch (SQLException e) {   e.printStackTrace();  }  System.out.println("SqlManager:Connect to database successful."); } // 关闭数据库 关闭对象，释放句柄 public void closeDB() {  System.out.println("Close connection to database..");  try {   stmt.close();   conn.close();  } catch (SQLException e) {   e.printStackTrace();  }  System.out.println("Close connection successful"); } // 查询 public ResultSet executeQuery(String sql) {  ResultSet rs = null;  try {   rs = stmt.executeQuery(sql);  } catch (SQLException e) {   e.printStackTrace();  }  return rs; } // 增添/删除/修改 public int executeUpdate(String sql) {  int ret = 0;  try {   ret = stmt.executeUpdate(sql);  } catch (SQLException e) {   e.printStackTrace();  }  return ret; }}

//****服务代码****public class StartService { /**  * 登录方法  * @param username  * @param password  * @return 登录成功与否  */ public HashMap<String, String> login(String username, String password) {  HashMap<String, String> hashMap = new HashMap<String, String>();  // 获取Sql查询语句  String logSql = "select perssion from userinfo where username ='"    + username + "' and password ='" + password + "'";  System.out.println(logSql);  // 获取DB对象  DBManager sql = DBManager.createInstance();  sql.connectDB();  hashMap.put("permission", "-1");  hashMap.put("username", username);  // 操作DB对象  try {   ResultSet rs = sql.executeQuery(logSql);   if (rs.next()) {    hashMap.put("permission", rs.getInt(1) + "");    System.out.print("权限===" + rs.getInt(1) + "/t");    sql.closeDB();    return hashMap;   }  } catch (SQLException e) {   e.printStackTrace();  }  sql.closeDB();  return hashMap; } /**  * 注册方法  * @param username  * @param password  * @return 注册成功与否  */ public HashMap<String, String> register(String username, String password) {  HashMap<String, String> hashMap = new HashMap<String, String>();  hashMap.put("username", username);  hashMap.put("msg", "notok");  if (this.namerepeat(username)) {   hashMap.put("msg", "rename");  } else {   // 获取Sql查询语句   String regSql = "insert into userinfo(username,password) values('"     + username + "','" + password + "')";   System.out.println(regSql);   // 获取DB对象   DBManager sql = DBManager.createInstance();   sql.connectDB();   int ret = sql.executeUpdate(regSql);   if (ret != 0) {    hashMap.put("msg", "ok");    sql.closeDB();    return hashMap;   }   sql.closeDB();  }  return hashMap; } /**  * 检测该账户是否已经注册  *   * @param username  * @return 注册状态  */ public Boolean namerepeat(String username) {  String checkSql = "select username from userinfo where username ='"    + username + "'";  // 获取Sql查询语句  System.out.println(checkSql);  // 获取DB对象  DBManager sql = DBManager.createInstance();  sql.connectDB();  // 操作DB对象  try {   ResultSet rs = sql.executeQuery(checkSql);   if (rs.next()) {    sql.closeDB();    return true;   }  } catch (SQLException e) {   e.printStackTrace();  }  sql.closeDB();  return false; }}

//****登录代码****String username = request.getParameter("username");String password = request.getParameter("password");username = new String(username.getBytes("ISO-8859-1"), "UTF-8");System.out.println("客户端参数：" + username + " ====== " + password); // 新建服务对象，默认权限为-1（未登录状态） StartService serv = new StartService(); int permission = -1; HashMap<String, String> logiii = serv.login(username, password); String a = logiii.get("username"); // 登陆验证处理（权限>-1为登录成功） if ("-1".equals(logiii.get("permission"))) {  // 登录失败  System.out.print("登录失败Failed"); } else {  // 登陆成功  permission = Integer.parseInt(logiii.get("permission")); } JSONObject jsonObj = new JSONObject(); try {  jsonObj.put("username", username);  jsonObj.put("permission", permission);  System.out.println(jsonObj);  // 返回信息到客户端  response.setCharacterEncoding("UTF-8");  response.setContentType("text/html");  PrintWriter out = response.getWriter();  out.print(jsonObj);  out.flush();  out.close(); } catch (JSONException e) {  e.printStackTrace(); }

{ "username": "001", "msg": "ok"}

{ "username": "001", "permission": 0}

{ "status": ok, //连接状态 "code": "200" //错误代码 "messages": [ //题目内容  {   "_id": 1, //题目id   "title": "1+1=？" //题目   "q_type": 0, //题目类型   "optionA": "1", //A选项   "optionB": "2", //B选项   "optionC": "3", //C选项   "optionD": "4", //D选项   "tips”:"这么简单还要提示？", //提示   "answer": "B", //答案  },  {   "_id": 2,    "title": "2+2=?"    "q_type": 0,    "optionA": "1",    "optionB": "2",    "optionC": "3",    "optionD": "4",   "tips":"这么简单还要提示？",    "answer": "D",  } ],}

public abstract class BaseActivity extends FragmentActivity implements View.OnClickListener { @Override protected final void onCreate(@Nullable Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  //得到布局文件  setContentView(getLayoutId());  //初始化  initView();  initData();  initListener(); } /**  * @return 布局文件id  */ abstract int getLayoutId(); /**  * 初始化View  */ void initView() { } /**  * 初始化界面数据  */ void initData() { } /**  * 绑定监听器与适配器  */ void initListener() { } /**  * 对统一的按钮进行统一处理  *  * @param v 点击的View  */ @Override public void onClick(View v) {  switch (v.getId()) {   default:    processClick(v);    break;  } } /**  * 点击事件  *  * @param v 点击的View  */ void processClick(View v) { }}

public class SplashActivity extends BaseActivity { @Override int getLayoutId() {  return R.layout.activity_splash; } @Override void initData() {  //延时2s，跳转。  new Handler().postDelayed(new Runnable() {   @Override   public void run() {    //跳转主页面    Intent intent = new Intent(SplashActivity.this, MainActivity.class);    startActivity(intent);    finish();   }  }, 2000); }}

public class LoginActivity extends BaseActivity { private static final int REQUEST_SIGNUP = 0; EditText et_username; EditText et_password; Button btn_login; TextView tv_signup; @Override int getLayoutId() {  return R.layout.activity_login; } @Override void initView() {  //通过id找控件  et_username = (EditText) findViewById(R.id.input_username);  et_password = (EditText) findViewById(R.id.input_password);  btn_login = (Button) findViewById(R.id.btn_login);  tv_signup = (TextView) findViewById(R.id.link_signup); } @Override void initListener() {  //登录按钮，注册链接设置点击监听事件  btn_login.setOnClickListener(this);  tv_signup.setOnClickListener(this); } @Override void processClick(View v) {  switch (v.getId()) {   //点击登录按钮，执行登录操作   case R.id.btn_login:    login();    break;   //如果点击了注册链接，则跳转到注册页面   case R.id.link_signup:    Intent intent = new Intent(getApplicationContext(), SignupActivity.class);    startActivityForResult(intent, REQUEST_SIGNUP);    finish();    //动画效果    overridePendingTransition(R.anim.push_left_in, R.anim.push_left_out);    break;   default:    break;  } } /**  * 登录方法  */ public void login() {  //如果内容不合法，则直接返回，显示错误。  if (!validate()) {   onLoginFailed();   return;  }  //输入合法，将登录按钮置为不可用，显示圆形进度对话框  btn_login.setEnabled(false);  final ProgressDialog progressDialog = new ProgressDialog(LoginActivity.this, R.style.AppTheme_Dark_Dialog);  progressDialog.setIndeterminate(true);  progressDialog.setMessage("登录中...");  progressDialog.show();  //获取输入内容  String username = et_username.getText().toString().trim();  String password = et_password.getText().toString().trim();  //联网，获取数据  OkGo.get(CONFIG.URL_LOGIN)    .params("username", username)    .params("password", password)    .execute(new StringCallback() {     @Override     public void onSuccess(String s, Call call, Response response) {      Gson gson = new Gson();      JsonLoginBean jsonLoginBean = gson.fromJson(s, JsonLoginBean.class);      //如果得到权限>0,则登录成功。      if (jsonLoginBean.getPermission() > 0) {       Log.e("zwc", "onSuccess: ===");       onLoginSuccess();       progressDialog.dismiss();      } else {       onLoginFailed();       progressDialog.dismiss();      }     }    }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {  if (requestCode == REQUEST_SIGNUP) {   if (resultCode == RESULT_OK) {    this.finish();   }  } } /**  * 重写返回键的返回方法  */ @Override public void onBackPressed() {  // Disable going back to the MainActivity  moveTaskToBack(true); } /**  * 登录成功  */ public void onLoginSuccess() {  btn_login.setEnabled(true);  Intent intent = new Intent(LoginActivity.this, MainActivity.class);  startActivity(intent);  finish(); } /**  * 登录失败  */ public void onLoginFailed() {  Toast.makeText(getBaseContext(), "登陆失败", Toast.LENGTH_LONG).show();  btn_login.setEnabled(true); } /**  * @return 判断是否账号密码是否合法  */ public boolean validate() {  //设置初值，默认为合法  boolean valid = true;  //获取输入内容  String email = et_username.getText().toString().trim();  String password = et_password.getText().toString().trim();  //判断账号  if (email.isEmpty()) {   et_username.setError("请输入你的账号");   valid = false;  } else {   et_username.setError(null);  }  //判断密码  if (password.isEmpty()) {   et_password.setError("请输入你的密码");   valid = false;  } else {   et_password.setError(null);  }  return valid; }}

<?xml version="1.0" encoding="utf-8"?><ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:fitsSystemWindows="true"> <LinearLayout  android:orientation="vertical"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:paddingTop="56dp"  android:paddingLeft="24dp"  android:paddingRight="24dp">  <ImageView android:src="@drawable/logo"   android:layout_width="wrap_content"   android:layout_height="72dp"   android:layout_marginBottom="24dp"   android:layout_gravity="center_horizontal" />  <!-- 账号 -->  <android.support.design.widget.TextInputLayout   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:layout_marginTop="8dp"   android:layout_marginBottom="8dp">   <EditText    android:id="@+id/input_username"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:inputType="number"    android:hint="账号" />  </android.support.design.widget.TextInputLayout>  <!-- 密码 -->  <android.support.design.widget.TextInputLayout   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:layout_marginTop="8dp"   android:layout_marginBottom="8dp">   <EditText android:id="@+id/input_password"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:inputType="textPassword"    android:hint="密码"/>  </android.support.design.widget.TextInputLayout>  <android.support.v7.widget.AppCompatButton   android:id="@+id/btn_login"   android:layout_width="fill_parent"   android:layout_height="wrap_content"   android:layout_marginTop="24dp"   android:layout_marginBottom="24dp"   android:padding="12dp"   android:text="登陆"/>  <TextView android:id="@+id/link_signup"   android:layout_width="fill_parent"   android:layout_height="wrap_content"   android:layout_marginBottom="24dp"   android:text="没有账号？创建一个"   android:gravity="center"   android:textSize="16dip"/> </LinearLayout></ScrollView>

public class SignupActivity extends BaseActivity { EditText _nameText; EditText _emailText; EditText _passwordText; EditText _reEnterPasswordText; Button _signupButton; TextView _loginLink; @Override int getLayoutId() {  return R.layout.activity_signup; } @Override void initView() {  //根据id找控件  _nameText = (EditText) findViewById(R.id.input_name);  _emailText = (EditText) findViewById(R.id.input_username);  _passwordText = (EditText) findViewById(R.id.input_password);  _reEnterPasswordText = (EditText) findViewById(R.id.input_reEnterPassword);  _signupButton = (Button) findViewById(R.id.btn_signup);  _loginLink = (TextView) findViewById(R.id.link_login);  _signupButton.setOnClickListener(this);  _loginLink.setOnClickListener(this); } @Override void processClick(View v) {  switch (v.getId()) {   case R.id.btn_signup:    signup();    break;   case R.id.link_login:    //点击登录连接，跳转到登录页面    Intent intent = new Intent(getApplicationContext(), LoginActivity.class);    startActivity(intent);    finish();    overridePendingTransition(R.anim.push_left_in, R.anim.push_left_out);    break;   default:    break;  } } public void signup() {  //判断是否合法  if (!validate()) {   onSignupFailed(0);   return;  }  _signupButton.setEnabled(false);  //显示圆形进度条对话框  final ProgressDialog progressDialog = new ProgressDialog(SignupActivity.this,    R.style.AppTheme_Dark_Dialog);  progressDialog.setIndeterminate(true);  progressDialog.setMessage("创建账号...");  progressDialog.show();  //获取数据  String username = _nameText.getText().toString();  String password = _passwordText.getText().toString();//  联网获取数据  OkGo.get(CONFIG.URL_SIGNUP)    .params("username", username)    .params("password", password)    .execute(new StringCallback() {     @Override     public void onSuccess(String s, Call call, Response response) {      Gson gson = new Gson();      JsonSignupBean jsonSignupBean = gson.fromJson(s, JsonSignupBean.class);      //如果得到返回消息为ok,则注册成功。      if (jsonSignupBean.getMsg().equals("ok")) {       Log.e("zwc", "onSuccess: 注册成功");       onSignupSuccess();       //对话框消失       progressDialog.dismiss();      } else {       onSignupFailed(1);       progressDialog.dismiss();      }     }    }); } /**  * 登陆成功  */ public void onSignupSuccess() {  _signupButton.setEnabled(true);  Intent intent = new Intent(SignupActivity.this, MainActivity.class);  startActivity(intent);  finish(); } /**  * 注册失败，按钮置为可用  * 依据传参不同，进行不同吐司  */ public void onSignupFailed(int i) {  if (i == 1) {   Toast.makeText(getBaseContext(), "该用户名已经被注册", Toast.LENGTH_LONG).show();  } else {   Toast.makeText(getBaseContext(), "注册失败", Toast.LENGTH_LONG).show();  }  _signupButton.setEnabled(true); } /**  * @return 输入内容是否合法  */ public boolean validate() {  boolean valid = true;  //从控件中获取数据  String name = _nameText.getText().toString();  String password = _passwordText.getText().toString();  String reEnterPassword = _reEnterPasswordText.getText().toString();  //检测账号是否正确  if (name.isEmpty()) {   _nameText.setError("账号不能为空");   valid = false;  } else {   _nameText.setError(null);  }  //检测密码是否正确  if (password.isEmpty()) {   _passwordText.setError("请输入密码");   valid = false;  } else {   _passwordText.setError(null);  }  //检测重复密码是否正确  if (reEnterPassword.isEmpty() || !(reEnterPassword.equals(password))) {   _reEnterPasswordText.setError("两次密码不一致");   valid = false;  } else {   _reEnterPasswordText.setError(null);  }  return valid; }}

<?xml version="1.0" encoding="utf-8"?><ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:fitsSystemWindows="true"> <LinearLayout  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:orientation="vertical"  android:paddingLeft="24dp"  android:paddingRight="24dp"  android:paddingTop="56dp">  <ImageView   android:layout_width="wrap_content"   android:layout_height="72dp"   android:layout_gravity="center_horizontal"   android:layout_marginBottom="24dp"   android:src="@drawable/logo" />  <!-- 账号 -->  <android.support.design.widget.TextInputLayout   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:layout_marginBottom="8dp"   android:layout_marginTop="8dp">   <EditText    android:id="@+id/input_name"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:hint="账号"    android:inputType="textPersonName" />  </android.support.design.widget.TextInputLayout>  <!-- 密码 -->  <android.support.design.widget.TextInputLayout   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:layout_marginBottom="8dp"   android:layout_marginTop="8dp">   <EditText    android:id="@+id/input_password"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:hint="密码"    android:inputType="textPassword" />  </android.support.design.widget.TextInputLayout>  <!-- 重复密码 -->  <android.support.design.widget.TextInputLayout   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:layout_marginBottom="8dp"   android:layout_marginTop="8dp">   <EditText    android:id="@+id/input_reEnterPassword"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:hint="重复密码"    android:inputType="textPassword" />  </android.support.design.widget.TextInputLayout>  <android.support.v7.widget.AppCompatButton   android:id="@+id/btn_signup"   android:layout_width="fill_parent"   android:layout_height="wrap_content"   android:layout_marginBottom="24dp"   android:layout_marginTop="24dp"   android:padding="12dp"   android:text="创建账号" />  <TextView   android:id="@+id/link_login"   android:layout_width="fill_parent"   android:layout_height="wrap_content"   android:layout_marginBottom="24dp"   android:gravity="center"   android:text="已有账号？马上登陆"   android:textSize="16dip" /> </LinearLayout></ScrollView>

public class AnswerActivity extends BaseActivity implements Chronometer.OnChronometerTickListener { private Chronometer chronometer; private ViewPager vp_answer; private ArrayList<Fragment> fragmentlists; private int minute = 0; private int second = 0; private AlertDialog.Builder builder; private ArrayList<String> a; private Button btn_previous; private Button btn_submit; private Button btn_next; private int nowpager = 0; private List<QuestBean> messages; private String type; @Override int getLayoutId() {  return R.layout.activity_answer; } /**  * 初始化布局  */ @Override void initView() {  chronometer = (Chronometer) findViewById(R.id._chro_exam);  vp_answer = (ViewPager) findViewById(R.id.vp_answer);  btn_previous = (Button) findViewById(R.id._btn_previous);  btn_submit = (Button) findViewById(R.id._btn_submit);  btn_next = (Button) findViewById(R.id._btn_next);//  获取传递来的变量  type = getIntent().getExtras().get("type").toString().trim();//  联网获取数据  initNet(type);  btn_previous.setOnClickListener(this);  btn_submit.setOnClickListener(this);  btn_next.setOnClickListener(this);  vp_answer.setOnPageChangeListener(new MyOnPageChangeListener());  setChronometer(); } /**  * 设置计时器  */ private void setChronometer() {  chronometer.setText(nowtime());  chronometer.start();  chronometer.setOnChronometerTickListener(this);  chronometer.setOnClickListener(this); } /**  * 计时器规则  *  * @param chronometer  */ @Override public void onChronometerTick(Chronometer chronometer) {  second++;  if (second == 59) {   minute++;   second = 00;  } } /**  * 现在时间  *  * @return  */ private String nowtime() {  if (second < 10) {   return (minute + ":0" + second);  } else {   return (minute + ":" + second);  } } /**  * 初始化网络连接  * @param type  */ private void initNet(String type) {  a = new ArrayList<>();  fragmentlists = new ArrayList<>();  Log.e("zwc", "initNet: 开始联网…………");  //进度条对话框  final ProgressDialog progressDialog = new ProgressDialog(AnswerActivity.this, R.style.AppTheme_Dark_Dialog);  progressDialog.setIndeterminate(true);  progressDialog.setMessage("获取题目中...");  progressDialog.show();//  联网  OkGo.get(CONFIG.URL_GETQUEST1)    .params("type", type)    .execute(new StringCallback() {     @Override     public void onSuccess(String s, Call call, Response response) {      Log.i("zwc", "onSuccess: ========---------======" + s);      //gson解析      Gson gson = new Gson();      JsonQuestBean jsonQuestBean = gson.fromJson(s, JsonQuestBean.class);      messages = jsonQuestBean.getMessages();      for (int i = 0; i < messages.size(); i++) {       QuestBean questBeanQ = messages.get(i);       questBeanQ.setId(i);       fragmentlists.add(new AnswerFragment(questBeanQ));       LoveDao.insertLove(questBeanQ);       a.add(questBeanQ.getId() + "");       Log.e("zwc", i + "ooooooonSuccessssssssssss: " + questBeanQ.getId() + questBeanQ.getTitle());      }//      设置适配器      vp_answer.setAdapter(new MainAdapter(getSupportFragmentManager()));      progressDialog.dismiss();     }     @Override     public void onError(Call call, Response response, Exception e) {      Log.i("zwc", "onError///////////////////");     }    });  Log.e("zwc", "initNet: 联网结束…………"); } /**  * viewpager适配器  */ class MainAdapter extends FragmentPagerAdapter {  public MainAdapter(FragmentManager fm) {   super(fm);  }  //获取条目  @Override  public Fragment getItem(int position) {   return fragmentlists.get(position);  }  //数目  @Override  public int getCount() {   return fragmentlists.size();  } } @Override void processClick(View v) {  switch (v.getId()) {//   点击上一题按钮   case R.id._btn_previous://    如果是第一题，则谈吐司提醒，否则上移一道题    if (nowpager == 0) {     Toast.makeText(AnswerActivity.this, "已经到头啦!", Toast.LENGTH_SHORT).show();    } else {     vp_answer.setCurrentItem(--nowpager);    }    break;//   点击提交按钮   case R.id._btn_submit://    简答题不进行提交评分    if (type.equals("3")) {     Toast.makeText(this, "简答题目前暂不支持评分", Toast.LENGTH_SHORT).show();     return;    }//    否则初始化并展示提交对话框    initAlertDialog();    builder.show();    break;//   点击下一题按钮   case R.id._btn_next://    如果是最后一题，则谈吐司提醒，否则下移一道题    if (nowpager == fragmentlists.size()) {     Toast.makeText(AnswerActivity.this, "已经是最后一题了!", Toast.LENGTH_SHORT).show();    } else {     vp_answer.setCurrentItem(++nowpager);    }    break;   default:    break;  } } // 弹出是否确认交卷的对话框 private void initAlertDialog() {  //新建对话框  builder = new AlertDialog.Builder(AnswerActivity.this);  builder.setTitle("提示");  builder.setMessage("是否确定交卷?");  builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {   @Override   public void onClick(DialogInterface dialog, int which) {    // TODO: 2017/6/14 交卷操作//    计算分数    int grade = 0;//    判断题    if (type.equals("2")) {     for (int i = 0; i < messages.size(); i++) {//      查询      QuestBean questBeenA = LoveDao.queryLove(Integer.parseInt(a.get(i)));//      判断      if (questBeenA.getAnswer().equals("对") && questBeenA.getMyanswer().equals("A") || questBeenA.getAnswer().equals("错") && questBeenA.getMyanswer().equals("B")) {       grade += 20;      }      ;     }    }//    选择题    else {     for (int i = 0; i < messages.size(); i++) {      QuestBean questBeenA = LoveDao.queryLove(Integer.parseInt(a.get(i)));      if (questBeenA.getAnswer().equals(questBeenA.getMyanswer())) {       grade += 20;      }      ;     }    }//    传递分数    Intent intent = new Intent(AnswerActivity.this, GradeActivity.class);    intent.putExtra("grade", "" + grade);//    传递题目列表    intent.putStringArrayListExtra("timu", a);    startActivity(intent);    finish();   }  });  builder.setNegativeButton("取消", null); } /**  * viewpager监听事件  */ private class MyOnPageChangeListener implements ViewPager.OnPageChangeListener {  @Override  public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {  }  @Override  public void onPageSelected(int position) {   nowpager = position;  }  @Override  public void onPageScrollStateChanged(int state) {  } }