RecyclerView-এ GridLayoutManager ব্যবহারের পদ্ধতি

GridLayoutManager ব্যবহার করে RecyclerView-এ গ্রিড লেআউট বাস্তবায়ন

এই উদাহরণটি দেখাবে কীভাবে RecyclerView-এ দুই কলামের গ্রিড লেআউট তৈরি করা যায়।

ধাপ ১: নতুন প্রজেক্ট তৈরি করুন

Android Studio-তে File → New Project নির্বাচন করুন।

ধাপ ২: লেআউট ফাইল (res/layout/activity_main.xml)

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="https://schemas.android.com/apk/res/android"
    xmlns:app="https://schemas.android.com/apk/res-auto">
    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <android.support.v7.widget.Toolbar
            android:id="@+id/appbarlayout_tool_bar"
            android:background="@color/colorPrimary"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_scrollFlags="scroll|snap|enterAlways"
            app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
    </android.support.design.widget.AppBarLayout>
    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>

ধাপ ৩: মেইন এক্টিভিটিতে কোড (src/MainActivity.java)

package com.example.myapplication;

import android.annotation.TargetApi;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.widget.Toast;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    ArrayList<String> list = new ArrayList<>();
    private RecyclerView recyclerView;
    private customAdapter mAdapter;
    private onClickInterface onclickInterface;

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.appbarlayout_tool_bar);
        toolbar.setTitle("This is toolbar.");
        setSupportActionBar(toolbar);
        onclickInterface = new onClickInterface() {
            @Override
            public void setClick(int abc) {
                list.remove(abc);
                Toast.makeText(MainActivity.this, "Position is " + abc, Toast.LENGTH_LONG).show();
                mAdapter.notifyDataSetChanged();
            }
        };
        recyclerView = findViewById(R.id.recycler_view);
        GridLayoutManager mLayoutManager = new GridLayoutManager(getApplicationContext(), 2);
        recyclerView.setLayoutManager(mLayoutManager);
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        mAdapter = new customAdapter(this, list, onclickInterface);
        recyclerView.setAdapter(mAdapter);
        DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(), DividerItemDecoration.HORIZONTAL);
        recyclerView.addItemDecoration(dividerItemDecoration);
        // ডেটা যোগ
        for (int i = 0; i < 20; i++) {
            list.add("Item " + i);
        }
    }
}

ধাপ ৪: কাস্টম অ্যাডাপ্টার (src/customAdapter.java)

package com.example.myapplication;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;

public class customAdapter extends RecyclerView.Adapter<customAdapter.MyViewHolder> {
    Context context;
    ArrayList<String> list;
    onClickInterface onClickInterface;

    public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView title;
        public MyViewHolder(View view) {
            super(view);
            title = view.findViewById(R.id.title);
        }
    }

    public customAdapter(Context context, ArrayList<String> list, onClickInterface onClickInterface) {
        this.context = context;
        this.list = list;
        this.onClickInterface = onClickInterface;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_row, viewGroup, false);
        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder myViewHolder, final int i) {
        myViewHolder.title.setText(list.get(i));
        myViewHolder.title.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onClickInterface.setClick(i);
            }
        });
    }

    @Override
    public int getItemCount() {
        return list.size();
    }
}

ধাপ ৫: লিস্ট রো লেআউট (res/layout/list_row.xml)

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="https://schemas.android.com/apk/res/android"
    xmlns:app="https://schemas.android.com/apk/res-auto"
    xmlns:tools="https://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:cardElevation="10dp"
    app:cardCornerRadius="20dp"
    tools:context=".MainActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="vertical">
        <ImageView
            android:id="@+id/imageView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/logo" />
        <TextView
            android:id="@+id/title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:textSize="30sp" />
        <TextView
            android:id="@+id/textview2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Sairamkrishan"
            android:textSize="30sp" />
    </LinearLayout>
</android.support.v7.widget.CardView>

ধাপ ৬: ক্লিক ইন্টারফেস (src/onClickInterface.java)

public interface onClickInterface {
    void setClick(int abc);
}

অ্যাপ্লিকেশন চালানোর পদ্ধতি

অ্যাপ চালু করলে দুই কলামের গ্রিডে আইটেম দেখাবে। আইটেমে ক্লিক করলে মুছে যাবে।