Make RecyclerView faster

Question

I'm new to the android backend. In my application, I need to show the data as in the photo. These are blocks 200x200 and more. Each block is divided by 10x10. I used RecyclerView in another RecyclerView to get this view, but it is slow. How to make it faster? I used part loading (adapter.notifyDataSetChanged) but scrolling working bad

Perhaps instead of recycler view inside a recycler view try using a GridLayoutManager... see here https://stackoverflow.com/questions/40587168/simple-android-grid-example-using-recyclerview-with-gridlayoutmanager-like-the — Quinn, Jan 03 '20 at 16:55
Are you making a lot of logic in the RecyclerView adapter? if so you should do that logic before, and in the adapter just simply display the views — Diogo Rosa, Jan 03 '20 at 17:20

score 0 · Answer 1 · answered Apr 05 '20 at 18:27

I did it which one is very fast:

build.gradle(Module:app) Here add Dependency

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>

activity_main.xml

<?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>

sample_layout.xml create

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="5dp">

    <ImageView
        android:id="@+id/myImageViewId"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_margin="5dp"
        android:src="@drawable/bd" />

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

        <TextView
            android:id="@+id/titleTextView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Title"
            android:textAppearance="@style/TextAppearance.AppCompat.Headline"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/descriptionTextView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Description will be here"
            android:textAppearance="@style/TextAppearance.AppCompat.SearchResult.Subtitle" />


    </LinearLayout>

</LinearLayout>

MainActivity.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));
    }
}

MyAdapter.java

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);
        }
    }
}

Make RecyclerView faster

1 Answers1