我使用RecyclerViewer来显示数据库中的产品。我使用 FirebaseRecyclerAdapter 获取数据库值。我想在 HomeActivity 中展示我的产品。我尝试了一切，但无法解决此问题，我的产品未显示在 HomeActivity 中。注意=我使用可绘制布局.xml。
content_home.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".HomeActivity"
tools:showIn="@layout/app_bar_home"
android:background="@android:color/white">
<android.support.v4.view.ViewPager
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:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="160dp"
tools:context="com.codinginflow.picassoimagesliderexample.MainActivity">
</android.support.v4.view.ViewPager>
<TextView
android:layout_marginTop="15dp"
android:id="@+id/urunlerimiztxt"
android:layout_below="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Ürünlerimiz"
android:textColor="@android:color/black"
android:textAlignment="center"
android:textSize="20sp"
android:textStyle="bold"/>
<View
android:id="@+id/urunlerimihr"
android:layout_margin="15dp"
android:layout_below="@id/urunlerimiztxt"
android:layout_width="fill_parent"
android:layout_height="2dp"
android:background="#c0c0c0"/>
<android.support.v7.widget.RecyclerView
android:layout_below="@+id/urunlerimihr"
android:id="@+id/urunler_recyclerview"
android:layout_width="match_parent"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
urunlerViewHolder.java
package com.example.hassucuk.ViewHolder;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.hassucuk.Interface.itemClickListner;
import com.example.hassucuk.R;
public class urunlerViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public ImageView urunresmi;
public TextView urunadi,urunfiyati,urunkilomiktari;
private itemClickListner listner;
public urunlerViewHolder(View itemView){
super(itemView);
urunresmi = (ImageView) itemView.findViewById(R.id.carturun_resim);
urunadi = (TextView) itemView.findViewById(R.id.carturun_ad);
urunfiyati = (TextView) itemView.findViewById(R.id.carturun_fiyat);
urunkilomiktari = (TextView) itemView.findViewById(R.id.carturun_kilomiktari);
}
public void setItemClickListener(itemClickListner listner){
this.listner=listner;
}
@Override
public void onClick(View view) {
listner.onClick(view, getAdapterPosition(),false);
}
}
home_product_cart.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_margin="15dp"
app:cardElevation="15dp">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="150dp"
android:gravity="center_horizontal"
android:background="@android:color/white"
android:orientation="horizontal">
<ImageView
android:id="@+id/carturun_resim"
android:layout_width="0dp"
android:layout_height="match_parent"
android:src="@drawable/acili_baton"
android:layout_weight="1"/>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/carturun_ad"
android:textSize="21sp"
android:layout_marginTop="15dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Acılı Baton Sucuk"
android:textColor="@android:color/black"
/>
<TextView
android:id="@+id/carturun_fiyat"
android:layout_marginTop="15dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="21sp"
android:text="53 ₺"
android:textColor="@android:color/black"
/>
<TextView
android:id="@+id/carturun_kilomiktari"
android:layout_marginTop="15dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="21sp"
android:text="Kilo : 1"
android:textColor="@android:color/black"
/>
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
HomeActivity.java
@Override
protected void onStart() {
super.onStart();
FirebaseRecyclerOptions<urunler> options = new FirebaseRecyclerOptions.Builder<urunler>()
.setQuery(urunlerRootRef,urunler.class)
.build();
FirebaseRecyclerAdapter<urunler, urunlerViewHolder> adapter =
new FirebaseRecyclerAdapter<urunler, urunlerViewHolder>(options) {
@Override
protected void onBindViewHolder(@NonNull urunlerViewHolder holder, int position, @NonNull urunler model) {
Picasso.get().load(model.getResim()).into(holder.urunresmi);
holder.urunadi.setText(model.getAd());
holder.urunfiyati.setText(model.getFiyat());
holder.urunkilomiktari.setText(model.getFiyat());
}
@NonNull
@Override
public urunlerViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int i) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.home_product_cart,parent,false);
urunlerViewHolder holder = new urunlerViewHolder(view);
return holder;
}//xml dosyasını java koduna dönüştürüyor ve o xml görünümünü döndürüyor.
};
ryclerviewurunler.setAdapter(adapter);
adapter.startListening();
}
Firebase 数据库 json 文件:
{
"Sliderlar" : {
"Haz 17, 201903:36:46" : {
"image" : "https://firebasestorage.googleapis.com/v0/b/has-sucuk.appspot.com/o/Slider%20Resimleri%2Fimage%3A161Haz%2017%2C%20201903%3A36%3A46.jpg?alt=media&token=42ad47df-a361-4247-9263-9a3b86758c64",
"sliderid" : "Haz 17, 201903:36:46"
},
"Haz 17, 201903:37:14" : {
"image" : "https://firebasestorage.googleapis.com/v0/b/has-sucuk.appspot.com/o/Slider%20Resimleri%2Fimage%3A166Haz%2017%2C%20201903%3A37%3A14.jpg?alt=media&token=e47449e0-a1c5-4870-9101-0936265c9cfb",
"sliderid" : "Haz 17, 201903:37:14"
},
"Haz 17, 201903:37:47" : {
"image" : "https://firebasestorage.googleapis.com/v0/b/has-sucuk.appspot.com/o/Slider%20Resimleri%2Fimage%3A164Haz%2017%2C%20201903%3A37%3A47.jpg?alt=media&token=9f681f32-dad3-44c8-a819-e5af02c08605",
"sliderid" : "Haz 17, 201903:37:47"
},
"Haz 17, 201903:37:59" : {
"image" : "https://firebasestorage.googleapis.com/v0/b/has-sucuk.appspot.com/o/Slider%20Resimleri%2Fimage%3A165Haz%2017%2C%20201903%3A37%3A59.jpg?alt=media&token=4dbd866c-0aa4-4673-84cd-dac5f81e4f6f",
"sliderid" : "Haz 17, 201903:37:59"
}
},
"Urunler" : {
"Haz 16, 201914:11:19" : {
"aciklama" : "Acılı Fermente Parmak ",
"ad" : "Acılı Fermente Parmak Sucuk",
"fiyat" : "53",
"resim" : "https://firebasestorage.googleapis.com/v0/b/has-sucuk.appspot.com/o/Urun%20resimleri%2Fimage%3A151Haz%2016%2C%20201914%3A11%3A19.jpg?alt=media&token=f3983562-6a71-414f-9eb7-413991d23a63",
"saat" : "14:11:19",
"tarih" : "Haz 16, 2019",
"urunid" : "Haz 16, 201914:11:19"
},
"Haz 16, 201914:12:43" : {
"aciklama" : "Acılı Parmak",
"ad" : "Acılı Parmak Sucuk",
"fiyat" : "53",
"resim" : "https://firebasestorage.googleapis.com/v0/b/has-sucuk.appspot.com/o/Urun%20resimleri%2Fimage%3A152Haz%2016%2C%20201914%3A12%3A43.jpg?alt=media&token=fe196025-cab7-4e87-919d-2ce43f23c2e8",
"saat" : "14:12:43",
"tarih" : "Haz 16, 2019",
"urunid" : "Haz 16, 201914:12:43"
},
"Haz 16, 201915:16:59" : {
"aciklama" : "Acısız Fermente Kangal",
"ad" : "Acısız Fermente Kangal Sucuk",
"fiyat" : "53",
"resim" : "https://firebasestorage.googleapis.com/v0/b/has-sucuk.appspot.com/o/Urun%20resimleri%2Fimage%3A153Haz%2016%2C%20201915%3A16%3A59.jpg?alt=media&token=39d3a104-8c80-4831-b578-c1804450a32f",
"saat" : "15:16:59",
"tarih" : "Haz 16, 2019",
"urunid" : "Haz 16, 201915:16:59"
},
"Haz 16, 201915:17:55" : {
"aciklama" : "Acısız Kangal",
"ad" : "Acısız Kangal Sucuk",
"fiyat" : "53",
"resim" : "https://firebasestorage.googleapis.com/v0/b/has-sucuk.appspot.com/o/Urun%20resimleri%2Fimage%3A154Haz%2016%2C%20201915%3A17%3A55.jpg?alt=media&token=24a41db6-d25b-480d-ba86-a4bb1fca6983",
"saat" : "15:17:55",
"tarih" : "Haz 16, 2019",
"urunid" : "Haz 16, 201915:17:55"
},
"Haz 16, 201915:18:49" : {
"aciklama" : "Acılı Baton",
"ad" : "Acılı Baton Sucuk",
"fiyat" : "53",
"resim" : "https://firebasestorage.googleapis.com/v0/b/has-sucuk.appspot.com/o/Urun%20resimleri%2Fimage%3A155Haz%2016%2C%20201915%3A18%3A49.jpg?alt=media&token=17cd8c5e-1bd2-4118-947a-32d8135fc3a0",
"saat" : "15:18:49",
"tarih" : "Haz 16, 2019",
"urunid" : "Haz 16, 201915:18:49"
}
},
"Users" : {
"05531530440" : {
"loginpassword" : "123456",
"loginphone" : "05531530440",
"name" : "Fatih İnci",
"role" : "admin"
},
"05531530450" : {
"loginpassword" : "123456",
"loginphone" : "05531530450",
"name" : "deneme 1",
"role" : "user"
}
}
}
最佳答案
在设置适配器之前，您需要在 RecyclerView 上设置 LayoutManager。
对于垂直滚动的项目列表，请使用:
ryclerviewurunler.setLayoutManager(new LinearLayoutManager(mContext, RecyclerView.VERTICAL, false));
关于java - 我的 RecyclerViewer 不显示 View 。我找不到错误。我的源代码在这里，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56629616/