Building Dynamic Image Galleries in Android Using Java: A Comprehensive Tutorial

Gallery in Android

FOLLOW THESE STEPS

Step 1: res > layout > activity_main.xml

	
    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    android:gravity="center_horizontal"
    tools:context=".MainActivity">


    <androidx.cardview.widget.CardView
        android:layout_width="300dp"
        android:layout_height="300dp"
        app:cardCornerRadius="150dp"
        android:layout_marginTop="30dp"
        >
        <ImageView
            android:layout_width="match_parent"
            android:layout_height="400dp"
            android:src="#686C6B"
            android:scaleType="fitXY"
            android:id="@+id/imgGallery"
            />
    </androidx.cardview.widget.CardView>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/btnGallery"
        android:layout_marginTop="21dp"
        android:text="@string/openGallery"
        />

</LinearLayout>

Step 2: MainActivity.class

	package com.heycolleagues.gallery;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

    private final int GALLERY_REQ_CODE = 1000;
    ImageView imgGallery;
    Button btnGallery;

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


        imgGallery = findViewById(R.id.imgGallery);
        btnGallery = findViewById(R.id.btnGallery);

        btnGallery.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent iGallery = new Intent(Intent.ACTION_PICK);
                iGallery.setData(MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                startActivityForResult(iGallery, GALLERY_REQ_CODE);
            }
        });

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);


        if (resultCode == RESULT_OK){
            if (requestCode == GALLERY_REQ_CODE){
                imgGallery.setImageURI(data.getData());
            }
        }


    }
}