Gridview Widget in Android

 Gridview Widget in Android:-

It is used to display data using Grid Pattern using rows and columns.

<GridView
    android:id="@+id/simpleGridView"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:footerDividersEnabled="false"
    android:padding="1dp"

android:numColumns="3" /> 

Base Adapter is a common base class of a general implementation of an Adapter that can be used in GridView. Whenever you need a customized grid view you create your own adapter and extend the base adapter in that. Base Adapter can be extended to create a custom Adapter for displaying custom grid items. ArrayAdapter is also an implementation of BaseAdapter. You can read BaseAdapter tutorial here.
Example of GridView using Base Adapter in Android Studio: Below is an example of GridView in Android, in which we show the Android logo’s in the form of Grids. In this example firstly we create an int type array for logo images and then call the Adapter to set the data in the GridView. In this, we create a CustomAdapter by extending BaseAdapter in it. At Last, we implement setOnItemClickListener event on GridView and on click of any item we send that item to another Activity and show the logo image in full size.

Syntax:-

1)  Design GridLayout:-

<?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"
    tools:context=".GridLayoutExample">

    <GridLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
    <Button
        android:text="ONE"
        android:id="@+id/bgl"
        android:layout_width="wrap_content"

        android:layout_row="1"
        android:layout_column="1"
        ></Button>

    <Button
        android:text="TWO"
        android:id="@+id/bg2"
        android:layout_row="1"
        android:layout_column="2"
        ></Button>

    <Button
        android:text="THREE"
        android:id="@+id/bg3"
        android:layout_row="2"
        android:layout_column="1"
        ></Button>

    <Button
        android:text="FOUR"
        android:id="@+id/bg4"
        android:layout_row="2"
        android:layout_column="2"
        ></Button>
    </GridLayout>
</RelativeLayout>

2)

package com.example.additionapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.GridView;

public class GridExample extends AppCompatActivity {

    int logo[] = {R.drawable.bg, R.drawable.sss, R.drawable.bg,R.drawable.sss};
    GridView grv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_grid_example);
        grv = findViewById(R.id.simpleGridView);
        GridAdapter ga = new GridAdapter(getApplicationContext(),logo);
        grv.setAdapter(ga);


    }
}

3)

package com.example.additionapplication;

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

public class GridAdapter extends BaseAdapter {
    Context ctx;
    int logos[];
    LayoutInflater inflter;
    GridAdapter(Context ctx, int logos[])
    {
           this.logos=logos;
           this.ctx=ctx;
           inflter = (LayoutInflater.from(ctx));
    }

    @Override
    public int getCount() {
        return logos.length;
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View view, ViewGroup parent) {
        view = inflter.inflate(R.layout.layout, null); // inflate the layout
        ImageView icon = (ImageView) view.findViewById(R.id.icon); // get the reference of ImageView
        icon.setImageResource(logos[position]); // set logo images
        return view;

    }
}


EVENT OF GRIDVIEW:-
..................................

GRIDVIEW use setOnItemClickListner to implement Code:-

grv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Toast.makeText(getApplicationContext(),"Result is "+logo[position],Toast.LENGTH_LONG).show();
    }
});