手动将数据插入Firebase数据库，并在我的android应用程序中显示为ListView

我正在尝试使用Firebase实时数据库为我的android应用程序创建校友数据库。我想手动从Firebase控制台插入数据。现在我的第一个问题是如何做到这一点（一个数据库的示例结构会很有帮助）。我的数据库有3个字段（姓名、职务和工作场所）

其次，在添加数据后，我如何在我的应用程序中将它们显示为ListView。我还想为我的数据库添加一个过滤器选项。我已经创建了模型类和列表布局

校友班：

public class Alumni {

    String name = null;
    String designation = null;
    String workplace = null;

    public Alumni(String name, String designation, String workplace) {
        this.name = name;
        this.designation = designation;
        this.workplace = workplace;
    }

    public String getName() {
        return name;
    }

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

    public String getDesignation() {
        return designation;
    }

    public void setDesignation(String designation) {
        this.designation = designation;
    }

    public String getWorkplace() {
        return workplace;
    }

    public void setWorkplace(String workplace) {
        this.workplace = workplace;
    }

    @Override
    public String toString() {
        return name + " " + designation + " " + workplace;
    }
}

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="5dp">

    <TextView
        android:id="@+id/name"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:padding="4dp"
        android:textSize="15sp"
        android:textStyle="bold"
        android:textColor="@color/colorPrimary"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/icon_work"
        android:layout_width="16dp"
        android:layout_height="16dp"
        android:layout_marginStart="12dp"
        android:layout_marginLeft="12dp"
        android:contentDescription="@string/icon_work"
        android:src="@drawable/icon_workplace"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/name" />

    <TextView
        android:id="@+id/designation"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="4dp"
        android:layout_marginLeft="4dp"
        android:textSize="12sp"
        android:textColor="@color/colorPrimary"
        app:layout_constraintBottom_toBottomOf="@+id/icon_work"
        app:layout_constraintStart_toEndOf="@id/icon_work"
        app:layout_constraintTop_toBottomOf="@+id/name" />

    <TextView
        android:id="@+id/bar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="4dp"
        android:layout_marginLeft="4dp"
        android:layout_marginEnd="4dp"
        android:layout_marginRight="4dp"
        android:text="@string/bar"
        android:textColor="@color/colorPrimary"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="@+id/designation"
        app:layout_constraintStart_toEndOf="@+id/designation"
        app:layout_constraintTop_toBottomOf="@+id/name" />

    <TextView
        android:id="@+id/workplace"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="4dp"
        android:layout_marginLeft="4dp"
        android:textColor="@color/colorPrimary"
        android:textSize="12sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/bar"
        app:layout_constraintTop_toBottomOf="@+id/name" />

</androidx.constraintlayout.widget.ConstraintLayout>

list\u row.xml:

public class Alumni {

    String name = null;
    String designation = null;
    String workplace = null;

    public Alumni(String name, String designation, String workplace) {
        this.name = name;
        this.designation = designation;
        this.workplace = workplace;
    }

    public String getName() {
        return name;
    }

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

    public String getDesignation() {
        return designation;
    }

    public void setDesignation(String designation) {
        this.designation = designation;
    }

    public String getWorkplace() {
        return workplace;
    }

    public void setWorkplace(String workplace) {
        this.workplace = workplace;
    }

    @Override
    public String toString() {
        return name + " " + designation + " " + workplace;
    }
}

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="5dp">

    <TextView
        android:id="@+id/name"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:padding="4dp"
        android:textSize="15sp"
        android:textStyle="bold"
        android:textColor="@color/colorPrimary"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/icon_work"
        android:layout_width="16dp"
        android:layout_height="16dp"
        android:layout_marginStart="12dp"
        android:layout_marginLeft="12dp"
        android:contentDescription="@string/icon_work"
        android:src="@drawable/icon_workplace"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/name" />

    <TextView
        android:id="@+id/designation"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="4dp"
        android:layout_marginLeft="4dp"
        android:textSize="12sp"
        android:textColor="@color/colorPrimary"
        app:layout_constraintBottom_toBottomOf="@+id/icon_work"
        app:layout_constraintStart_toEndOf="@id/icon_work"
        app:layout_constraintTop_toBottomOf="@+id/name" />

    <TextView
        android:id="@+id/bar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="4dp"
        android:layout_marginLeft="4dp"
        android:layout_marginEnd="4dp"
        android:layout_marginRight="4dp"
        android:text="@string/bar"
        android:textColor="@color/colorPrimary"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="@+id/designation"
        app:layout_constraintStart_toEndOf="@+id/designation"
        app:layout_constraintTop_toBottomOf="@+id/name" />

    <TextView
        android:id="@+id/workplace"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="4dp"
        android:layout_marginLeft="4dp"
        android:textColor="@color/colorPrimary"
        android:textSize="12sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/bar"
        app:layout_constraintTop_toBottomOf="@+id/name" />

</androidx.constraintlayout.widget.ConstraintLayout>

关于这类示例的文章链接将很有帮助