前端之家

  1. 首页
  2. 问答

为什么Android CardView不显示文本内容？

• 问答

我试图在CardView内使用TextView简单显示Firestore集合中的一些文本，但无济于事。目前，使用下面的代码，CardView成功显示，但其中不显示任何文本。我的TextView在RecyclerView内部。我正在按照youtube教程进行此项目，但是视频中的人获得了所需的输出，但我无法获得它。 https://youtu.be/lAGI6jGS4vs我不知道我要去哪里错了。

以下是代码， note_item.xml 

<?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="100dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:backgroundTint="@color/ic_launcher_background"
    android:layout_marginEnd="8dp">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="10dp">

        <TextView
            android:id="@+id/text_view_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentStart="true"
            android:ellipsize="end"
            android:maxLines="1"
            android:text="Name"
            android:textColor="#FFEB3B" />

        <TextView
            android:id="@+id/text_view_phone"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/text_view_name"
            android:textColor="#FFEB3B"
            android:layout_alignParentStart="true"
            android:text="Phone" />

        <TextView
            android:id="@+id/text_view_address"
            android:textColor="#FFEB3B"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/text_view_phone"
            android:layout_alignParentStart="true"
            android:text="Address" />

        <TextView
            android:id="@+id/text_view_details"
            android:textColor="#FFEB3B"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/text_view_address"
            android:layout_alignParentStart="true"
            android:text="Details" />
    </RelativeLayout>

</androidx.cardview.widget.CardView>

Note.java 

package com.example.authenticatorapp;

public class Note {
    private String name;
    private String phone;
    private String address;
    private String details;

    public Note() {

    }

    public Note(String name,String phone,String address,String details){
        this.name = name;
        this.phone = phone;
        this.address = address;
        this.details = details;
    }

    public String getName() {
        return name;
    }

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

    public String getPhone() {
        return phone;
    }

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

    public String getaddress() {
        return address;
    }

    public void setaddress(String address) {
        this.address = address;
    }

    public String getDetails() {
        return details;
    }

    public void setDetails(String details) {
        this.details = details;
    }
}

NoteAdapter.java 

package com.example.authenticatorapp;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.firebase.ui.firestore.FirestoreRecyclerAdapter;
import com.firebase.ui.firestore.FirestoreRecyclerOptions;

public class NoteAdapter extends FirestoreRecyclerAdapter<Note,NoteAdapter.NoteHolder> {


    public NoteAdapter(@NonNull FirestoreRecyclerOptions<Note> options) {
        super(options);
    }

    @Override
    protected void onBindViewHolder(@NonNull NoteHolder holder,int position,@NonNull Note model) {
        holder.textViewName.setText(model.getName());
        holder.textViewPhone.setText(model.getPhone());
        holder.textViewAddress.setText(model.getaddress());
        holder.textViewDetails.setText(model.getDetails());
    }

    @NonNull
    @Override
    public NoteHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
        View v = LayoutInflater.from(parent.getcontext()).inflate(R.layout.note_item,parent,false);
        return new NoteHolder(v);
    }

    class NoteHolder extends RecyclerView.ViewHolder {
        TextView textViewName;
        TextView textViewPhone;
        TextView textViewAddress;
        TextView textViewDetails;

        public NoteHolder(View itemView) {
            super(itemView);
            textViewName = itemView.findViewById(R.id.text_view_name);
            textViewPhone = itemView.findViewById(R.id.text_view_phone);
            textViewAddress = itemView.findViewById(R.id.text_view_address);
            textViewDetails = itemView.findViewById(R.id.text_view_details);
        }
    }
}

Receive.java（就像mainactivity.java一样）

package com.example.authenticatorapp;


import androidx.appcompat.app.AppCompatactivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;

import com.firebase.ui.firestore.FirestoreRecyclerOptions;
import com.google.firebase.firestore.CollectionReference;
import com.google.firebase.firestore.FirebaseFirestore;

public class Receive extends AppCompatactivity {
    private FirebaseFirestore db = FirebaseFirestore.getInstance();
    private CollectionReference notebookRef = db.collection("DonationDetails");

    private NoteAdapter adapter;

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

        setUpRecyclerView();
    }
    private void setUpRecyclerView() {

        FirestoreRecyclerOptions<Note> options = new FirestoreRecyclerOptions.Builder<Note>()
                .setQuery(notebookRef,Note.class)
                .build();
        adapter = new NoteAdapter(options);
        RecyclerView recyclerView = findViewById(R.id.recycler_view);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setadapter(adapter);
    }

    @Override
    protected void onStart() {
        super.onStart();
        adapter.startListening();
    }

    @Override
    protected void onStop() {
        super.onStop();
        adapter.stopListening();
    }
}

activity_receive.xml 

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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="@drawable/images"
    tools:context=".Receive">

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

</androidx.coordinatorlayout.widget.CoordinatorLayout>

这是可能有助于@AlexMamo的数据库结构

为什么Android CardView不显示文本内容？

huilovenai 回答：为什么Android CardView不显示文本内容？
暂时没有好的解决方案，如果你有好的解决方案，请发邮件至：iooj@foxmail.com
androidandroid-cardviewfirebase
本文链接：https://www.f2er.com/2942890.html

大家都在问