Question

这是我尝试创建的signUp活动，用户输入用户名，emailID和密码。发生的问题是onClick（）仅工作一次。假设密码和confirmPassword不匹配，则textlayout显示消息，但如果它再次不匹配则没有任何反应。我帮我错了。

public class SignUp extends AppCompatActivity {

// will send the data into database and return to the login page with a confirm signup message

private final AppCompatActivity activity = SignUp.this;
TextInputEditText usernameText,emailIdText,passwordText,confirmPasswordText;
NestedScrollView nestedScrollView;
TextInputLayout usernameTextLayout, emailIdTextLayout, passwordTextLayout, confirmPasswordTextLayout;
DatabaseManager manager ;
ErrorsHelper helper;
Students student;


@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.sign_up);
    initViews();
    initObjects();
}

//views initializer 
public void initViews(){

    nestedScrollView = (NestedScrollView)findViewById(R.id.signUpNestedScrollView);

    // Text Input Layout views
    usernameTextLayout = (TextInputLayout) findViewById(R.id.usernameTextLayout);
    emailIdTextLayout = (TextInputLayout) findViewById(R.id.emailIdTextLayout);
    passwordTextLayout = (TextInputLayout) findViewById(R.id.passwordTextLayout);
    confirmPasswordTextLayout = (TextInputLayout) findViewById(R.id.confirmPasswordTextLayout);

    // Text Input views
    usernameText = (TextInputEditText)findViewById(R.id.usernameText);
    emailIdText = (TextInputEditText)findViewById(R.id.emailIdText);
    passwordText = (TextInputEditText)findViewById(R.id.passwordText);
    confirmPasswordText = (TextInputEditText)findViewById(R.id.confirmPasswordText);
}

// objects initializer
public void initObjects(){
    helper = new ErrorsHelper(activity);
    manager = new DatabaseManager(activity);
    student = new Students();

}

//Register Button
public void onClick(View view){

    if(!helper.emptyTextField(usernameText,usernameTextLayout,"Please enter username.")){
        return;
    }
    if(!helper.emptyTextField(emailIdText,emailIdTextLayout,"Please enter email-id.")){
        return;
    }
    if(!helper.emptyTextField(passwordText,passwordTextLayout,"Please enter password.")){
        return;
    }
    if(!helper.emptyTextField(confirmPasswordText,confirmPasswordTextLayout,"Please enter your password to confirm.")){
        return;
    }
    if(!helper.passwordConfirm(passwordText,confirmPasswordText,confirmPasswordTextLayout,"Confirm password doesn't match!")){
        return;
    }
    String username = usernameText.getText().toString();
    String emailId = emailIdText.getText().toString();
    String confirmPassword = confirmPasswordText.getText().toString();
    if (manager.checkUsernameExistence(username)) {
        student.set_username(username);
        student.set_emailid(emailId);
        student.set_password(confirmPassword);
        //add student
        manager.addStudent(student);

        Snackbar.make(nestedScrollView,"Registration Successful.",Snackbar.LENGTH_LONG).show();
        Intent intent = new Intent(this,SignInMainPage.class);
        startActivity(intent);
    }
   else{
        helper.userExists(usernameTextLayout,"Username already exists.");
    }
}
}

ErrorHelper类有助于在一个地方维护所有基于错误的事情。此外，Snackbar没有显示。

public class ErrorsHelper {

Context context;

public ErrorsHelper(Context context) {
    this.context = context;
}

public boolean emptyTextField(TextInputEditText editText, TextInputLayout inputLayout, String errorMessage) {
    String value = editText.getText().toString().trim();
    if (value.isEmpty()) {
        inputLayout.setError(errorMessage);
        hideKeyboardFrom(editText);
        return false;
    } else {
        inputLayout.setErrorEnabled(false);
    }

    return true;
}

;

public boolean passwordConfirm(TextInputEditText password, TextInputEditText confirmPassword, TextInputLayout confirmPasswordLayout, String errorMessage) {

    String pass = password.getText().toString();
    String cPass = confirmPassword.getText().toString();
    if (pass != cPass) {
        confirmPasswordLayout.setError(errorMessage);
        return false;
    } else {
        confirmPasswordLayout.setErrorEnabled(false);
    }
    return true;
}

private void hideKeyboardFrom(View view) {
    InputMethodManager imm = (InputMethodManager) context.getSystemService(Activity.INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(view.getWindowToken(), WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
}

public void userExists( TextInputLayout confirmPasswordLayout, String errorMessage){
    confirmPasswordLayout.setError(errorMessage);
}

}

这是我的SignUp页面的XML布局文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView 
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/signUpNestedScrollView"
android:paddingTop="100dp">

<LinearLayout
    android:id="@+id/signUpLinearLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

<android.support.design.widget.TextInputLayout
    android:id="@+id/usernameTextLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center">
<android.support.design.widget.TextInputEditText
    android:id="@+id/usernameText"
    android:layout_width="250dp"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="100dp"
    android:hint="Username here"
    android:fontFamily="casual"/>
</android.support.design.widget.TextInputLayout>

<android.support.design.widget.TextInputLayout
    android:id="@+id/emailIdTextLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center">

<android.support.design.widget.TextInputEditText
    android:id="@+id/emailIdText"
    android:layout_width="250dp"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="20dp"
    android:hint="Email-ID here"
    android:fontFamily="casual"/>
</android.support.design.widget.TextInputLayout>

<android.support.design.widget.TextInputLayout
    android:id="@+id/passwordTextLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center">

<android.support.design.widget.TextInputEditText
    android:id="@+id/passwordText"
    android:layout_width="250dp"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="20dp"
    android:hint="Password"
    android:inputType="textPassword"
    android:fontFamily="casual"/>
</android.support.design.widget.TextInputLayout>

<android.support.design.widget.TextInputLayout
    android:id="@+id/confirmPasswordTextLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center">

<android.support.design.widget.TextInputEditText
    android:id="@+id/confirmPasswordText"
    android:layout_width="250dp"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="20dp"
    android:hint="Confirm Password"
    android:inputType="textPassword"
    android:fontFamily="casual"/>
</android.support.design.widget.TextInputLayout>

<Button
    android:id="@+id/signupButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="20dp"
    android:fontFamily="casual"
    android:onClick="onClick"
    android:text="Sign-Up"
    android:textStyle="bold"
    android:layout_gravity="center"/>

</LinearLayout>
</android.support.v4.widget.NestedScrollView>

Answer 1

    public void onClick(View view){

        // they should be here
            String username = usernameText.getText().toString();
            String emailId = emailIdText.getText().toString();
            String confirmPassword = confirmPasswordText.getText().toString();

        if(!username.isEmpty()&&!emailId.isEmpty()&&!confirmPassword.isEmpty())
        {    
            if(!helper.emptyTextField(usernameText,usernameTextLayout,"Please enter username.")){
                return;
            }
            if(!helper.emptyTextField(emailIdText,emailIdTextLayout,"Please enter email-id.")){
                return;
            }
            if(!helper.emptyTextField(passwordText,passwordTextLayout,"Please enter password.")){
                return;
            }
            if(!helper.emptyTextField(confirmPasswordText,confirmPasswordTextLayout,"Please enter your password to confirm.")){
                return;
            }
            if(!helper.passwordConfirm(passwordText,confirmPasswordText,confirmPasswordTextLayout,"Confirm password doesn't match!")){
                return;
            }

            if (manager.checkUsernameExistence(username)) {
                student.set_username(username);
                student.set_emailid(emailId);
                student.set_password(confirmPassword);
                //add student
                manager.addStudent(student);


                //Snackbar.make(findViewById(android.R.id.content),"Registration Successful.",Snackbar.LENGTH_LONG).show();
                Snackbar s = Snackbar.make(findViewById(android.R.id.content),"Registration Successful.",Snackbar.LENGTH_LONG);
                s.show();
                Intent intent = new Intent(this,SignInMainPage.class);
                startActivity(intent);
            }
           else{
                helper.userExists(usernameTextLayout,"Username already exists.");
            }
        }
        else
            Toast.makeText(getApplicationContext,"Empty",Toast.LENGTH_LONG).show;

    }

onClick只工作一次

1 个答案: