In this post, we are going to develop an application, its kinda game which can be used to prank your friends. 
. Yes, you want to fool your friends with a simple android application, just go through the post to develop one for you . I would like to name this application – ‘Screen crack prank’.
. Yes, you want to fool your friends with a simple android application, just go through the post to develop one for you . I would like to name this application – ‘Screen crack prank’.Application’s theme:
Let your friends play the game on your Android phone and see how the screen cracks and the screen goes black and also vibrates. Your friends will believe they broke your phone.
You must have already seen such applications in Google play but creating one such application is really fun!!
Let us start creating the application:
Either you can proceed with the below listings, or you can directly download code.
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- Create new android project [File >> New >> Android Project] with project name TapperApp
- Click next and select target android device version [I chose version 2.2]
- Click next and enter package name – ‘com.prgguru.android’
- Click finish
Layout creation:
We will create a simple layout which has one textview to display instructions and one button who is the hero of ‘Screen Crack Prank’ app.
Main.xml:
Replace the XML present in /res/layout with the below one:
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| <?xml version="1.0" encoding="utf-8"?> android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:id="@+id/background"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Challenge for you!" android:textStyle="bold" android:textColor="#0587d9" android:textSize="20sp" android:layout_margin="20dip" android:gravity="center" android:id="@+id/title"/> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:textColor="#000" android:layout_margin="20dip" android:text="INSTRUCTIONS:\n\nTry to tap the button 100 times within 30 seconds.\n\nBest of Luck!" android:id="@+id/blurb"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="20dip" android:padding="25dip" android:text="100" android:layout_gravity="center" android:id="@+id/button"/></LinearLayout> |
The application layout should look like:
We have to add few resources before we proceed with writing logic for the application.
Load cracked_screen.png (crack image) under /res/drawable-hdpi folder and glass.ogg (glass breaking sound file) under /res/raw folder. If raw folder is not created, create one under /res folder.
Application logic:
TapperAppActivity.java:
Logic behind the application is given below:
Open TapperAppAcitivty class under com.prgguru.android package and add the below class. Each line of code is commented to let you understand the code logic.
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| package com.prgguru.android;import java.util.Random;import com.example.tapperapp.R;import android.media.MediaPlayer;import android.os.Bundle;import android.os.Vibrator;import android.app.Activity;import android.content.Context;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class TapperAppActivity extends Activity implements OnClickListener{ MediaPlayer mPlayer; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //Set application layout setContentView(R.layout.main); //Assign media player object with sound file mPlayer = MediaPlayer.create(TapperAppActivity.this, R.raw.glass); //Find the button ((Button) findViewById(R.id.button)).setOnClickListener(this); } public void onClick(View v) { //If our applicaitons' button is clicked if (v.getId()==R.id.button) { //Get the button text which is 100 int i = Integer.parseInt(((Button) v).getText().toString()); //Decrement button text value and set it as button text ((Button) v).setText(Integer.toString(--i)); //Create Random object Random gen = new Random(); //If random value btwn (0 - 9)+1 equals to 10 or i is lesser than 50 if ((gen.nextInt(10) + 1 == 10) || (i<50)) { //Call crack method crack(); //Make listener to button as null ((Button) v).setOnClickListener(null); } } } private void crack() { //Call audio effects method audibleFX(); //Call visual effects method visualFX(); //Call vibrate effects method touchFX(); } private void audibleFX() { //Play sound file mPlayer.start(); } private void visualFX() { //Set background with broken glass image findViewById(R.id.background).setBackgroundResource(R.drawable.cracked_screen); //Set title textview with color 0x6400ff00 ((TextView)findViewById(R.id.title)).setTextColor(0x6400ff00); //Set blurb textview with color 0x64ffffff ((TextView)findViewById(R.id.blurb)).setTextColor(0x64ffffff); //Set button with color 0x64cdc9c9 ((Button)findViewById(R.id.button)).setBackgroundColor(0x64cdc9c9); } private void touchFX() { //Create vibrator object Vibrator mv = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE); //Vibrate for 500 MS mv.vibrate(new long[]{ 0, 500, 0 }, -1); } protected void onDestroy() { super.onDestroy(); // Release mediaplayer if (mPlayer != null) { mPlayer.release(); mPlayer = null; } }} |
Add vibrate permission in Androidmanifest.xml:
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| <uses-permission android:name="android.permission.VIBRATE" /> |
To know more about how to use vibration service in Android, see Android vibrate example
Demo:
Congratulations, We are done.
Let us test the application:
Right click on the project >> Run as >> Android application >> Choose emulator or device
Tap on the button and see what happens.
Let us test the application:
Right click on the project >> Run as >> Android application >> Choose emulator or device
Tap on the button and see what happens.
akm
www.cdacians.com
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