Android 使RecyclerView更快

我是android后端的新手。在我的应用程序中，我需要显示照片中的数据。这些是200x200和更多块。每个区块被10x10分割。我在另一个RecyclerView中使用了RecyclerView来获取此视图，但速度很慢。如何使它更快？我使用了部分加载（adapter.notifyDataSetChanged），但滚动工作不好

我做到了哪一个非常快：

build.gradle（模块：app）此处添加依赖项

implementation 'androidx.recyclerview:recyclerview:1.1.0'

string.xml

<resources>
    <string name="app_name">Recycler view</string>

    <string-array name="country_description">
        <item>Bangladesh is a Beautiful</item>
        <item>India is a Awesome</item>
        <item>Pakistan is a nice country</item>
        <item>SaudiArabia is a good</item>
        <item>Srilanka is a pretty</item>
    </string-array>

    <string-array name="country_name">
        <item>Bangladesh</item>
        <item>India</item>
        <item>Pakistan</item>
        <item>SaudiArabia</item>
        <item>Srilanka</item>
    </string-array>
</resources>

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:padding="10dp">

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

</androidx.constraintlayout.widget.ConstraintLayout>

MyAdapter.java

package com.example.recyclerview;

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

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    MyAdapter myAdapter;
    RecyclerView recyclerView;

    int[] images = {R.drawable.bd, R.drawable.india, R.drawable.pak, R.drawable.saudi, R.drawable.srilanka};
    String[] title, desc;

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

        recyclerView = findViewById(R.id.recyclerView);

        title = getResources().getStringArray(R.array.country_name);
        desc = getResources().getStringArray(R.array.country_description);

        myAdapter = new MyAdapter(this, title, desc, images);
        recyclerView.setAdapter(myAdapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
    }
}

package com.example.recyclerview;

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

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

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

    Context context;
    String[] title, desc;
    int[] images;

    public MyAdapter(Context context, String[] title, String[] desc, int[] images) {
        this.context = context;
        this.title = title;
        this.desc = desc;
        this.images = images;
    }

    //    ---------------- Convert Sample layout xml to Java code -----------------------------
    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater layoutInflater = LayoutInflater.from(context);
        View view = layoutInflater.inflate(R.layout.sample_layout, parent, false);
        return new MyViewHolder(view);
    }


    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {

        holder.titleTextView.setText(title[position]);
        holder.descTextView.setText(desc[position]);
        holder.flagImageView.setImageResource(images[position]);

    }

    @Override
    public int getItemCount() {
        return title.length;
    }


// ---------------------Create Recycler view Holder Personally--------


    class MyViewHolder extends RecyclerView.ViewHolder {

        TextView titleTextView, descTextView;
        ImageView flagImageView;


        public MyViewHolder(@NonNull View itemView) {
            super(itemView);

            titleTextView = itemView.findViewById(R.id.titleTextView);
            descTextView = itemView.findViewById(R.id.descriptionTextView);
            flagImageView = itemView.findViewById(R.id.myImageViewId);
        }
    }
}

package com.example.recyclerview；
导入android.content.Context；
导入android.view.LayoutInflater；
导入android.view.view；
导入android.view.ViewGroup；
导入android.widget.ImageView；
导入android.widget.TextView；
导入androidx.annotation.NonNull；
导入androidx.recyclerview.widget.recyclerview；
公共类MyAdapter扩展了RecyclerView.Adapter{
语境；
字符串[]标题，描述；
int[]图像；
公共MyAdapter（上下文上下文、字符串[]标题、字符串[]说明、int[]图像）{
this.context=上下文；
this.title=标题；
this.desc=desc；
这个。图像=图像；
}
//------------将示例布局xml转换为Java代码-----------------------------
@非空
@凌驾
public MyViewHolder onCreateViewHolder（@NonNull ViewGroup父级，int-viewType）{
LayoutInflater LayoutInflater=LayoutInflater.from（上下文）；
视图=布局更平坦。充气（R.layout.sample\u布局，父级，false）；
返回新的MyViewHolder（视图）；
}
@凌驾
public void onBindViewHolder（@NonNull MyViewHolder，int位置）{
holder.titleTextView.setText（标题[位置]）；
holder.descTextView.setText（desc[位置]）；
holder.flagImageView.setImageResource（图像[位置]）；
}
@凌驾
public int getItemCount（）{
返回title.length；
}
//----------------亲自创建回收器视图--------
类MyViewHolder扩展了RecyclerView.ViewHolder{
TextView titleTextView，descTextView；
ImageView flagImageView；
公共MyViewHolder（@NonNull View itemView）{
超级（项目视图）；
titleTextView=itemView.findViewById（R.id.titleTextView）；
descTextView=itemView.findViewById（R.id.descriptionTextView）；
flagImageView=itemView.findViewById（R.id.myImageViewId）；
}
}
}

也许可以尝试使用GridLayoutManager来代替回收器视图中的回收器视图。。。看这里，你在RecyclerView适配器中做了很多逻辑吗？如果是这样的话，您应该在之前执行该逻辑，并且在适配器中只需显示viewsThanks以获取帮助

package com.example.recyclerview;

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

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

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

    Context context;
    String[] title, desc;
    int[] images;

    public MyAdapter(Context context, String[] title, String[] desc, int[] images) {
        this.context = context;
        this.title = title;
        this.desc = desc;
        this.images = images;
    }

    //    ---------------- Convert Sample layout xml to Java code -----------------------------
    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater layoutInflater = LayoutInflater.from(context);
        View view = layoutInflater.inflate(R.layout.sample_layout, parent, false);
        return new MyViewHolder(view);
    }


    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {

        holder.titleTextView.setText(title[position]);
        holder.descTextView.setText(desc[position]);
        holder.flagImageView.setImageResource(images[position]);

    }

    @Override
    public int getItemCount() {
        return title.length;
    }


// ---------------------Create Recycler view Holder Personally--------


    class MyViewHolder extends RecyclerView.ViewHolder {

        TextView titleTextView, descTextView;
        ImageView flagImageView;


        public MyViewHolder(@NonNull View itemView) {
            super(itemView);

            titleTextView = itemView.findViewById(R.id.titleTextView);
            descTextView = itemView.findViewById(R.id.descriptionTextView);
            flagImageView = itemView.findViewById(R.id.myImageViewId);
        }
    }
}