How to Build a Simple e-Crackers App using Android?
Pre-requisites:
- Android App Development Fundamentals for Beginners
- Guide to Install and Set up Android Studio
- How to Create/Start a New Project in Android Studio?
- Running your first Android app
- How to add Lottie Animation in an Android App
- MediaPlayer Class in Android
In this article, we are going to build a simple e-Crackers app. It consists of a single RelativeLayout. Its background is set to black. Then we are going to populate images of stars randomly on the layout, to get a feel of a sky. Then we are going to add OnTouchListener to the layout, to detect taps. Once the user taps on the screen, it bursts fireworks. We are going to get the X and Y coordinates of the touched position, and use Lottie files for the fireworks, along with MediaPlayer class for the sound effects. We are going to build this entire application in Android using Java.
Step by Step Implementation
Step 1: Create a New Project
To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Java as the programming language.
Step 2: Add Dependencies
Before moving to the coding section let’s add the necessary dependencies. The only dependency we have to add for the project is for Lottie files. Lottie is an open-source animation file format that can be used inside our application. Go to app-level build.gradle file and add the following dependency and click on sync now.
def lottieVersion = "3.4.0" implementation "com.airbnb.android:lottie:$lottieVersion"
Here is a reference,
Step 3: Add resource files
Let’s add the necessary vector assets and drawable resource files. Go to app > res > drawable and add the following vector file for stars.
star.xml (Star Icon)
XML
<vector android:height="24dp" android:tint="#FFFFFF" android:viewportHeight="24" android:viewportWidth="24" <path android:fillColor="@android:color/white" android:pathData="M12,17.27L18.18,21l-1.64,-7.03L22,9.24l-7.19,-0.61L12,2 9.19,8.63 2,9.24l5.46,4.73L5.82,21z"/> </vector> |
preview:
star.xml
Now go to the resources folder, right-click > new > Android Resource Directory.
A dialog box appears. Name the directory raw and set resource type to raw.
Now add the following JSON file to the raw directory.
fireworks.json
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Then add any of your own mp3 files to the raw directory for sound effects and name it, burst.mp3. Once you’ve added both the fireworks.json file and burst.mp3 file to the raw directory, it will look something like this,
Step 4: Working with the activity_main.xml file
We have added the necessary resource files for the application we are building. Now, Let’s design the UI for our application. Add this XML file to app > res > layout. Below is the code for the activity_main.xml file.
XML
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout android:id="@+id/layout" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/black" tools:context=".MainActivity" /> |
Preview:
Now we have added all the necessary resource files.
Step 5: Working with the MainActivity.java file
Now it’s time to initialize everything in MainActivity and implement functions to populate stars and implement ontouchlistener. Here is the complete code for MainActivity. Below is the code for the MainActivity.java file. Comments are added inside the code to understand the code in more detail.
Java
package com.cs.ecrackers; import androidx.appcompat.app.AppCompatActivity; import android.annotation.SuppressLint; import android.content.pm.ActivityInfo; import android.graphics.Point; import android.media.MediaPlayer; import android.os.Bundle; import android.util.Log; import android.view.Display; import android.view.MotionEvent; import android.widget.ImageView; import android.widget.RelativeLayout; import android.widget.Toast; import com.airbnb.lottie.LottieAnimationView; import java.util.Random; public class MainActivity extends AppCompatActivity { int maxX,maxY; RelativeLayout layout; RelativeLayout.LayoutParams lp; @SuppressLint("ClickableViewAccessibility") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // to hide action bar getSupportActionBar().hide(); // to set orientation to potrait setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); // to get max value for x, y coordinates setMaxCoordinates(); // initializing relative layout layout = (RelativeLayout) findViewById(R.id.layout); // layout params lp = new RelativeLayout.LayoutParams(maxX, maxY); // to populate stars randomly on screen populateStarsRandomly(); // on touch listener for relative layout layout.setOnTouchListener((view, motionEvent) -> { // get coordinates int x = (int) motionEvent.getX() - 250; int y = (int) motionEvent.getY() - 250; // on touch if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) { burstFireworks(x,y); } return true; }); } // to burst fireworks private void burstFireworks(int x, int y) { RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(maxX, maxY); // creating lottieAnimation view LottieAnimationView cracker = new LottieAnimationView(this); cracker.setLayoutParams(lp); // initializing lottie view from json file cracker.setAnimation(R.raw.fireworks); // setting height and width of lottie file cracker.getLayoutParams().height = 500; cracker.getLayoutParams().width = 500; // setting positions of lottie file cracker.setX(x); cracker.setY(y); // adding lottieanimationview to relative layout layout.addView(cracker); cracker.playAnimation(); // function to generate sound burstSound(); } // function to generate crackers sound private void burstSound() { MediaPlayer mp = MediaPlayer.create(this,R.raw.burst); mp.start(); } // function to populate stars randomly on screen private void populateStarsRandomly() { float x,y; // random class to generate random coordinates Random random = new Random(); // for loop to place 100 stars randomly for(int i=0; i<100; ++i){ // generating random x coordinate x = random.nextInt(maxX); // generating random y coordinate y = random.nextInt(maxY); // placing star in x,y coordinate populateXY(x,y); } } // function to create and place star in x,y coordinates private void populateXY(float x, float y) { // creating imageview ImageView ivStar = new ImageView(this); ivStar.setLayoutParams(lp); // initializing image from drawable ivStar.setImageResource(R.drawable.star); // setting height and width of image ivStar.getLayoutParams().height = 15; ivStar.getLayoutParams().width = 15; // setting positions of image ivStar.setX(x); ivStar.setY(y); // adding imageview to relative layout layout.addView(ivStar); } // setting max coordinates of screen private void setMaxCoordinates() { Display disp = getWindowManager().getDefaultDisplay(); Point mdispSize = new Point(); disp.getSize(mdispSize); maxX = mdispSize.x; maxY = mdispSize.y; } } |
That’s it. Now we can run the application. Make sure that your project contains all the following files.
Here is the preview of the final application.
Output:
.png)
