不太明白問題在那裡?
在layout 看也沒有問題，就是run出來之後就這樣
為什麼不是這樣?

package com.example.testproduct;

import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;

import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

import org.w3c.dom.NodeList;

public class MainActivity extends AppCompatActivity {

    RecyclerView mRecyclerView;
    FirebaseDatabase mFirebaseDatabase;
    DatabaseReference mRef;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        ActionBar actionBar = getSupportActionBar();

        actionBar.setTitle("Posts List");

        mRecyclerView = findViewById(R.id.recyclerView);
        mRecyclerView.setHasFixedSize(true);

        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));

        mFirebaseDatabase = FirebaseDatabase.getInstance();
        mRef = mFirebaseDatabase.getReference("Data");
    }

    @Override
    protected void onStart() {
        super.onStart();
        FirebaseRecyclerAdapter<Model,ViewHolder> firebaseRecyclerAdapter =
                new FirebaseRecyclerAdapter<Model,ViewHolder> (
                        Model.class,
                        R.layout.row,
                        ViewHolder.class,
                        mRef
                ){

                    @Override
                    protected void populateViewHolder(ViewHolder viewHolder,Model model, int position) {

                        viewHolder.setDetails(getApplication(),model.getTitle(),model.getDescription(),model.getImage());

                    }
                };

        mRecyclerView.setAdapter(firebaseRecyclerAdapter);
    }
}

package com.example.testproduct;

public class Model {
    String title,image,description;

    public Model() {
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getImage() {
        return image;
    }

    public void setImage(String image) {
        this.image = image;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

package com.example.testproduct;

import android.content.Context;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.recyclerview.widget.RecyclerView;

import com.squareup.picasso.Picasso;

public class ViewHolder extends RecyclerView.ViewHolder {
    View mView;

    public ViewHolder(View itemView) {
        super(itemView);

        mView = itemView;
    }
    public void setDetails(Context ctx, String title, String description, String image){
        TextView mTitleTV = mView.findViewById(R.id.rTitleTv);
        TextView mDetailTv = mView.findViewById(R.id.rDescriptionTv);
        ImageView mImageTv = mView.findViewById(R.id.rImageView);

        mTitleTV.setText(title);
        mDetailTv.setText(description);
        Picasso.get().load(image).into(mImageTv);
    }

}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    app:cardBackgroundColor="#fff"
    app:cardCornerRadius="3dp"
    app:cardElevation="3dp"
    app:contentPadding="5dp"
    app:cardUseCompatPadding="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/rTitleTv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Title"
            android:textColor="#000"
            android:textSize="22sp"
            android:textStyle="bold" />

        <ImageView
            android:id="@+id/rImageView"
            android:layout_width="match_parent"
            android:layout_height="200dp"
            android:scaleType="centerCrop"
            android:adjustViewBounds="true"
            android:background="@drawable/ic_launcher_background"/>

        <TextView
            android:id="@+id/rDescriptionTv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="This will be the description of the post"
            android:textSize="20sp" />

    </LinearLayout>


</androidx.cardview.widget.CardView>

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.google.firebase:firebase-database:16.0.4'
    implementation 'com.firebaseui:firebase-ui-database:0.4.0'
    implementation 'com.squareup.picasso:picasso:2.71828'
    implementation 'androidx.cardview:cardview:1.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'