我想通过以下代码从 android 工作室在实时数据库中添加数据，但它不应该工作

Question

Code for registration

//Code used for inserting the data of students I am not adding import parts because this question is not submitted at that time.

public class StudentregisterActivity extends AppCompatActivity {

    EditText stname;
    EditText stphone;
    EditText stemail;
    EditText stpassword;
    Button stbtn;


    DatabaseReference studentref;
    

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

        stname=findViewById(R.id.editTextTextPersonName);
        stemail=findViewById(R.id.editTextTextEmailAddress);
        stphone=findViewById(R.id.editTextPhone);
        stpassword=findViewById(R.id.editTextTextPassword);
        stbtn=findViewById(R.id.button7);

        studentref=FirebaseDatabase.getInstance().getReference().child("Students");

        stbtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                
                InsertStudentData();

            }
        });
    }
    private void InsertStudentData(){

        String name=stname.getText().toString();
        String email=stemail.getText().toString();
        String phone=stphone.getText().toString();
        String password=stpassword.getText().toString();

        Students students=new Students(name,email,phone,password);

        studentref.push().setValue(students);
        Toast.makeText(StudentregisterActivity.this,"Register Successfully",Toast.LENGTH_SHORT).show();

    }
}

Students

package com.example.pariksha;

public class Students {

    String name;
    String email;
    String phone;
    String password;

    public Students(String name, String email, String phone, String password) {
        this.name = name;
        this.email = email;
        this.phone = phone;
        this.password = password;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

setting-gradle

//Gradle setting of the project

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.PREFER_SETTINGS)
    repositories {
        google()
        mavenCentral()
        jcenter()
        maven { url "https://maven.xyz.com" }
    }
}
rootProject.name = "Pariksha"
include ':app'

gradle-properties

//Gradle properties of the project

# Project-wide Gradle settings.
# IDE (e.g. Android Studio) users:
# Gradle settings configured through the IDE *will override*
# any settings specified in this file.
# For more details on how to configure your build environment visit
# http://www.gradle.org/docs/current/userguide/build_environment.html
# Specifies the JVM arguments used for the daemon process.
# The setting is particularly useful for tweaking memory settings.
org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
# When configured, Gradle will run in incubating parallel mode.
# This option should only be used with decoupled projects. More details, visit
# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
# org.gradle.parallel=true
# Kotlin code style for this project: "official" or "obsolete":
kotlin.code.style=official
android.useAndroidX=true
android.enableJetifier=true

gradle-build app

//Gradle properties of app

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'com.google.gms.google-services'
}

android {
    compileSdk 31

    defaultConfig {
        applicationId "com.example.pariksha"
        minSdk 19
        targetSdk 31
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    //noinspection GradleCompatible
    implementation 'androidx.appcompat:appcompat:1.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.google.firebase:firebase-auth:19.2.0'
    implementation 'com.google.firebase:firebase-database:19.2.1'
    implementation 'com.google.firebase:firebase-database:20.0.3'
    implementation platform('com.google.firebase:firebase-bom:29.0.3')
    implementation 'com.google.firebase:firebase-analytics'
    implementation 'com.google.firebase:firebase-analytics:20.0.2'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

}

build gradle project

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:7.0.4"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.6.0"
        classpath 'com.google.gms:google-services:4.3.10'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {

    repositories {
        // Check that you have the following line (if not, add it):
        google()  // Google's Maven repository
        mavenCentral()


    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

Answer 1

First of all please have a look at rules defined for Firebase Realtime Database. If you're not using Firebase Auth, You can Update rules like this.

Goto Realtime Database then change tab to Rules and update rules.

{  
 "rules": {
    ".read": true,
    ".write": true
  }
}

Then you can write data.

private void InsertStudentData(){

    String name=stname.getText().toString();
    String email=stemail.getText().toString();
    String phone=stphone.getText().toString();
    String password=stpassword.getText().toString();

    Students students=new Students(name,email,phone,password);

    studentref.setValue(students).addOnSuccessListener(new OnSuccessListener<Void>() {
        @Override
        public void onSuccess(Void aVoid) {
             Toast.makeText(StudentregisterActivity.this,"Register Successfully",Toast.LENGTH_SHORT).show();
        }
    })
    .addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {
            Toast.makeText(StudentregisterActivity.this,"Register failed",Toast.LENGTH_SHORT).show();

        }
    });

}

Answer 2

Make sure following things

1. Internet permission in Manifest.
2. Set Firebase Realtime database Rules to Public/Authenticate user for private rules.
3. Internet Availability on testing device to push data into database.

To set Internet Permission

<uses-permission android:name="android.permission.INTERNET" />

To set rules to public

1. Goto Firebase console
2. Realtime database rules
3. Paste this code in rules

**

{
 “rules”: {
 “.read”: true,
 “.write”: true
 }
}

**

At the end try uploading data using the code below

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference tasksRef = rootRef.child("Students").push();
Students students=new Students(name,email,phone,password);
tasksRef.setValue(student);