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運行應用程序時我的活動布局未顯示

[英]My activity layout isn't showing when I run the app

 原文  2023-01-12 10:40:26  8   2    java/ android

問題描述

我目前正在 Android Studio 中構建一個 Android 應用程序，該應用程序是用 Java 編寫的，這是一個症狀檢查器應用程序，在啟動該應用程序時，用戶將需要選擇是要開設患者帳戶還是醫生帳戶。 對於患者帳戶選項，我在運行該應用程序時設法看到了布局，但當我嘗試選擇醫生帳戶選項時，該應用程序未顯示布局。 考慮到代碼沒有顯示任何錯誤這一事實，這很奇怪，甚至 logcat 也顯示該過程完全正常。

這是醫生帳戶選項的活動 class 和 xml，還有主要的 class。很抱歉，如果我以某種方式發布此內容可能會造成混淆，這是我第一次在這里提問。

DoctorRegistrationActivity.java

`package com.example.jeusain;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DatabaseReference;

public class DoctorRegistrationActivity extends AppCompatActivity {

    private TextView goToLogin;
    private Button doctorRegisterButton;
    private EditText doctor_name, university, placeofpractice, medicalregistrationnumber, doctor_email, doctor_password;

    //firebase initialisation

    private FirebaseAuth mAuth;
    private FirebaseAuth mUser;
    private DatabaseReference reference;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_doctor_registration);

        doctorRegisterButton = findViewById(R.id.doctor_registerbutton_page1);
        doctor_name = findViewById(R.id.doctor_fullname);
        university = findViewById(R.id.graduated_uni);
        placeofpractice = findViewById(R.id.place_of_practice);
        medicalregistrationnumber = findViewById(R.id.registration_number);
        doctor_email = findViewById(R.id.doctor_email);
        doctor_password = findViewById(R.id.doctor_password);
        goToLogin = findViewById(R.id.loginFromDoctor);

        mAuth = FirebaseAuth.getInstance();

        if (mAuth.getCurrentUser() != null){
            startActivity(new Intent(getApplicationContext(),DoctorProfileActivity.class));
            finish();
        }

        doctorRegisterButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                performValidations();
                Intent goToLogin = new Intent(DoctorRegistrationActivity.this, LoginActivity.class);
                startActivity(goToLogin);
            }
        });
        goToLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                openLogin();
            }
        });
    }


    public void openLogin(){
        Intent login = new Intent(DoctorRegistrationActivity.this, LoginActivity.class);
        startActivity(login);
    }

    private void performValidations(){

        String getDoctorname = doctor_name.getText().toString();
        String getUniversity = university.getText().toString();
        String getPlaceofPractice = placeofpractice.getText().toString();
        String getMedicalregistrationnumber = medicalregistrationnumber.getText().toString();
        String getDoctoremail = doctor_email.getText().toString();
        String getDoctorpassword = doctor_password.getText().toString();

        if (TextUtils.isEmpty(getDoctorname)){
            doctor_name.setError("Name is required!");
            return;
        }

        if (TextUtils.isEmpty(getUniversity)){
            university.setError("University is required!");
            return;
        }

        if (TextUtils.isEmpty(getPlaceofPractice)){
            placeofpractice.setError("Place of Practice is required!");
            return;
        }

        if (TextUtils.isEmpty(getMedicalregistrationnumber)){
            medicalregistrationnumber.setError("Medical registration number is required!");
            return;
        }

        if (TextUtils.isEmpty(getDoctoremail)){
            doctor_email.setError("Email is required!");
            return;
        }

        if (TextUtils.isEmpty(getDoctorpassword)){
            doctor_password.setError("Password is required!");
            return;
        }

        if (doctor_password.length()<8){
            doctor_password.setError("Password must be 8 or more characters!");
            return;
        }

        //register the user in firebase

        mAuth.createUserWithEmailAndPassword(getDoctoremail, getDoctorpassword).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                if (task.isSuccessful()){
                    Toast.makeText(DoctorRegistrationActivity.this, "User Created!", Toast.LENGTH_SHORT).show();
                    startActivity(new Intent(getApplicationContext(),DoctorProfileActivity.class));
                }
                else{
                    Toast.makeText(DoctorRegistrationActivity.this, "Error!" + task.getException().getMessage(), Toast.LENGTH_SHORT).show();

                }

            }
        });
    }
}`

activity_doctor_registration.xml


`<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#a0db8e"
    tools:context=".DoctorRegistrationActivity">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginStart="16dp"
        android:layout_marginTop="32dp"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="16dp"
        android:background="@drawable/oval_background_shape"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/title_DRP_1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"

                android:layout_marginTop="24dp"
                android:gravity="center"
                android:text="You're a registered medical practitioner?"
                android:textColor="@color/black"
                android:textSize="24sp"
                android:textStyle="bold"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/subtitle_DRP1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="24dp"
                android:gravity="center"
                android:text="Please fill in the form with relevant information"
                android:textSize="20sp"
                app:layout_constraintEnd_toEndOf="@+id/title_DRP_1"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/title_DRP_1" />

            <EditText
                android:id="@+id/doctor_fullname"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="24dp"
                android:ems="10"
                android:hint="Name"
                android:inputType="textPersonName"
                android:minHeight="48dp"
                app:layout_constraintEnd_toEndOf="@+id/subtitle_DRP1"
                app:layout_constraintStart_toStartOf="@+id/subtitle_DRP1"
                app:layout_constraintTop_toBottomOf="@+id/subtitle_DRP1" />

            <EditText
                android:id="@+id/graduated_uni"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:ems="10"
                android:hint="Graduated university"
                android:inputType="textPersonName"
                android:minHeight="48dp"
                app:layout_constraintEnd_toEndOf="@+id/doctor_fullname"
                app:layout_constraintStart_toStartOf="@+id/doctor_fullname"
                app:layout_constraintTop_toBottomOf="@+id/doctor_fullname" />

            <EditText
                android:id="@+id/place_of_practice"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:ems="10"
                android:hint="Place of Practice"
                android:inputType="textPersonName"
                android:minHeight="48dp"
                app:layout_constraintEnd_toEndOf="@+id/graduated_uni"
                app:layout_constraintStart_toStartOf="@+id/graduated_uni"
                app:layout_constraintTop_toBottomOf="@+id/graduated_uni" />

            <EditText
                android:id="@+id/registration_number"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:ems="10"
                android:hint="Medical Registration Number"
                android:inputType="number"
                android:minHeight="48dp"
                app:layout_constraintEnd_toEndOf="@+id/place_of_practice"
                app:layout_constraintStart_toStartOf="@+id/place_of_practice"
                app:layout_constraintTop_toBottomOf="@+id/place_of_practice" />

            <EditText
                android:id="@+id/doctor_email"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:ems="10"
                android:hint="E-mail address"
                android:inputType="textEmailAddress"
                android:minHeight="48dp"
                app:layout_constraintEnd_toEndOf="@+id/registration_number"
                app:layout_constraintStart_toStartOf="@+id/registration_number"
                app:layout_constraintTop_toBottomOf="@+id/registration_number" />

            <EditText
                android:id="@+id/doctor_password"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:ems="10"
                android:hint="Password"
                android:inputType="textPassword"
                android:minHeight="48dp"
                app:layout_constraintEnd_toEndOf="@+id/doctor_email"
                app:layout_constraintStart_toStartOf="@+id/doctor_email"
                app:layout_constraintTop_toBottomOf="@+id/doctor_email" />

            <Button
                android:id="@+id/doctor_registerbutton_page1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="32dp"
                android:text="REGISTER"
                app:layout_constraintEnd_toEndOf="@+id/doctor_password"
                app:layout_constraintStart_toStartOf="@+id/doctor_password"
                app:layout_constraintTop_toBottomOf="@+id/doctor_password" />

            <TextView
                android:id="@+id/loginFromDoctor"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Login here"
                tools:layout_editor_absoluteX="280dp"
                tools:layout_editor_absoluteY="597dp"
                tools:ignore="MissingConstraints" />

        </androidx.constraintlayout.widget.ConstraintLayout>
    </ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>

` MainActivity.java

`package com.example.jeusain;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    Button choose_patient_account, choose_doctor_account;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_start_page);

        choose_patient_account = (Button) findViewById(R.id.patient_reg);
        choose_doctor_account = (Button) findViewById(R.id.doctor_reg);

        choose_patient_account.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openPatientRegister();
            }
        });

        choose_doctor_account.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openDoctorRegister();
            }
        });
    }
    public void openPatientRegister() {
        Intent goToPatientRegister = new Intent(getApplicationContext(), PatientRegistrationActivity.class);
        startActivity(goToPatientRegister);
    }
    public void openDoctorRegister() {
        Intent goToDoctorRegister = new Intent(getApplicationContext(), DoctorRegistrationActivity.class);
        startActivity(goToDoctorRegister);
    }
}`

2 個解決方案

解決方案1
 0  2023-01-12 12:14:21

利用：

public void openDoctorRegister() {
    Intent goToDoctorRegister = new Intent(this, DoctorRegistrationActivity.class);
    startActivity(goToDoctorRegister);
}

代替

public void openDoctorRegister() {
    Intent goToDoctorRegister = new Intent(getApplicationContext(), DoctorRegistrationActivity.class);
    startActivity(goToDoctorRegister);
}

解決方案2
 0  2023-01-12 17:37:11

Kristy Welsh 的回答不能解決您的問題，然后嘗試指定 Activity 名稱而不是“this”

public void openDoctorRegister() {
    Intent goToDoctorRegister = new Intent(MainActivity.this,DoctorRegistrationActivity.class);
    startActivity(goToDoctorRegister);
}

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