├── .gitignore
├── .idea
├── codeStyles
│ └── Project.xml
├── gradle.xml
├── misc.xml
└── runConfigurations.xml
├── README.md
├── app
├── .gitignore
├── build.gradle
├── proguard-rules.pro
└── src
│ ├── androidTest
│ └── java
│ │ └── com
│ │ └── shubham
│ │ └── mahalkar
│ │ └── scratchcarddemo
│ │ └── ExampleInstrumentedTest.java
│ ├── main
│ ├── AndroidManifest.xml
│ ├── java
│ │ └── com
│ │ │ └── shubham
│ │ │ └── mahalkar
│ │ │ └── scratchcarddemo
│ │ │ ├── MainActivity.java
│ │ │ ├── ScratchCard.java
│ │ │ └── Utils.java
│ └── res
│ │ ├── drawable-v24
│ │ ├── ic_cup.xml
│ │ └── ic_launcher_foreground.xml
│ │ ├── drawable
│ │ └── ic_launcher_background.xml
│ │ ├── layout
│ │ └── activity_main.xml
│ │ ├── mipmap-anydpi-v26
│ │ ├── ic_launcher.xml
│ │ └── ic_launcher_round.xml
│ │ ├── mipmap-hdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-mdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-xhdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-xxhdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-xxxhdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ └── values
│ │ ├── attrs.xml
│ │ ├── colors.xml
│ │ ├── strings.xml
│ │ └── styles.xml
│ └── test
│ └── java
│ └── com
│ └── shubham
│ └── mahalkar
│ └── scratchcarddemo
│ └── ExampleUnitTest.java
├── build.gradle
├── gradle.properties
├── gradle
└── wrapper
│ ├── gradle-wrapper.jar
│ └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
└── settings.gradle
/.gitignore:
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2 | .gradle
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7 | /.idea/workspace.xml
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9 | /.idea/assetWizardSettings.xml
10 | .DS_Store
11 | /build
12 | /captures
13 | .externalNativeBuild
14 | .cxx
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/.idea/codeStyles/Project.xml:
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/README.md:
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1 | # ScratchCardDemo
2 | # Android Studio Scratch Card Example like Google Scratch Card Rewards
3 |
4 | 
5 |
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/app/.gitignore:
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1 | /build
2 |
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/app/build.gradle:
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1 | apply plugin: 'com.android.application'
2 |
3 | android {
4 | compileSdkVersion 29
5 | buildToolsVersion "29.0.3"
6 |
7 | defaultConfig {
8 | applicationId "com.shubham.mahalkar.scratchcarddemo"
9 | minSdkVersion 19
10 | targetSdkVersion 29
11 | versionCode 1
12 | versionName "1.0"
13 |
14 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
15 | }
16 |
17 | buildTypes {
18 | release {
19 | minifyEnabled false
20 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
21 | }
22 | }
23 |
24 | }
25 |
26 | dependencies {
27 | implementation fileTree(dir: 'libs', include: ['*.jar'])
28 |
29 | implementation 'androidx.appcompat:appcompat:1.1.0'
30 | implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
31 | testImplementation 'junit:junit:4.12'
32 | androidTestImplementation 'androidx.test.ext:junit:1.1.1'
33 | androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
34 | }
35 |
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/app/proguard-rules.pro:
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1 | # Add project specific ProGuard rules here.
2 | # You can control the set of applied configuration files using the
3 | # proguardFiles setting in build.gradle.
4 | #
5 | # For more details, see
6 | # http://developer.android.com/guide/developing/tools/proguard.html
7 |
8 | # If your project uses WebView with JS, uncomment the following
9 | # and specify the fully qualified class name to the JavaScript interface
10 | # class:
11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
12 | # public *;
13 | #}
14 |
15 | # Uncomment this to preserve the line number information for
16 | # debugging stack traces.
17 | #-keepattributes SourceFile,LineNumberTable
18 |
19 | # If you keep the line number information, uncomment this to
20 | # hide the original source file name.
21 | #-renamesourcefileattribute SourceFile
22 |
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/app/src/androidTest/java/com/shubham/mahalkar/scratchcarddemo/ExampleInstrumentedTest.java:
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1 | package com.shubham.mahalkar.scratchcarddemo;
2 |
3 | import android.content.Context;
4 |
5 | import androidx.test.platform.app.InstrumentationRegistry;
6 | import androidx.test.ext.junit.runners.AndroidJUnit4;
7 |
8 | import org.junit.Test;
9 | import org.junit.runner.RunWith;
10 |
11 | import static org.junit.Assert.*;
12 |
13 | /**
14 | * Instrumented test, which will execute on an Android device.
15 | *
16 | * @see Testing documentation
17 | */
18 | @RunWith(AndroidJUnit4.class)
19 | public class ExampleInstrumentedTest {
20 | @Test
21 | public void useAppContext() {
22 | // Context of the app under test.
23 | Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
24 |
25 | assertEquals("com.shubham.mahalkar.scratchcarddemo", appContext.getPackageName());
26 | }
27 | }
28 |
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/app/src/main/AndroidManifest.xml:
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/app/src/main/java/com/shubham/mahalkar/scratchcarddemo/MainActivity.java:
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1 | package com.shubham.mahalkar.scratchcarddemo;
2 |
3 | import androidx.appcompat.app.AppCompatActivity;
4 |
5 | import android.content.Intent;
6 | import android.os.Bundle;
7 | import android.view.View;
8 | import android.widget.TextView;
9 |
10 | public class MainActivity extends AppCompatActivity {
11 |
12 | private ScratchCard mScratchCard;
13 | TextView codeTxt;
14 | String number;
15 |
16 | @Override
17 | protected void onCreate(Bundle savedInstanceState) {
18 | super.onCreate(savedInstanceState);
19 | setContentView(R.layout.activity_main);
20 |
21 | mScratchCard = findViewById(R.id.scratchCard);
22 | codeTxt = findViewById(R.id.codeTxt);
23 | number = codeTxt.getText().toString();
24 | codeTxt.setText(number);
25 | codeTxt.setText(Utils.generateNewCode());
26 |
27 | findViewById(R.id.btnScratchAgain).setOnClickListener(new View.OnClickListener() {
28 | @Override
29 | public void onClick(View v) {
30 | finish();
31 | startActivity(getIntent());
32 | }
33 | });
34 | }
35 |
36 | private void scratch(boolean isScratched) {
37 | if (isScratched) {
38 | mScratchCard.setVisibility(View.INVISIBLE);
39 | } else {
40 | mScratchCard.setVisibility(View.VISIBLE);
41 | }
42 | }
43 |
44 | private void handleListeners() {
45 | mScratchCard.setOnScratchListener(new ScratchCard.OnScratchListener() {
46 | @Override
47 | public void onScratch(ScratchCard scratchCard, float visiblePercent) {
48 | if (visiblePercent > 0.8) {
49 | scratch(true);
50 | }
51 | }
52 | });
53 | }
54 | }
55 |
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/app/src/main/java/com/shubham/mahalkar/scratchcarddemo/ScratchCard.java:
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1 | package com.shubham.mahalkar.scratchcarddemo;
2 |
3 | import android.content.Context;
4 | import android.content.res.TypedArray;
5 | import android.graphics.Bitmap;
6 | import android.graphics.Canvas;
7 | import android.graphics.Paint;
8 | import android.graphics.Path;
9 | import android.graphics.PorterDuff;
10 | import android.graphics.PorterDuffXfermode;
11 | import android.graphics.drawable.Drawable;
12 | import android.util.AttributeSet;
13 | import android.view.MotionEvent;
14 | import android.view.View;
15 |
16 | /**
17 | * Created by shubham on 25,April,2020
18 | */
19 | public class ScratchCard extends View {
20 | private Drawable mDrawable;
21 | private float mScratchWidth;
22 | private Bitmap mBitmap;
23 | private Canvas mCanvas;
24 | private Path mPath;
25 | private Paint mInnerPaint;
26 | private Paint mOuterPaint;
27 | private OnScratchListener mListener;
28 |
29 | public interface OnScratchListener {
30 | void onScratch(ScratchCard scratchCard, float visiblePercent);
31 | }
32 |
33 | public ScratchCard(Context context, AttributeSet attrs, int defStyle) {
34 | super(context, attrs, defStyle);
35 | resolveAttr(context, attrs);
36 | }
37 |
38 | public ScratchCard(Context context, AttributeSet attrs) {
39 | super(context, attrs);
40 | resolveAttr(context, attrs);
41 | }
42 |
43 | public ScratchCard(Context context) {
44 | super(context);
45 | resolveAttr(context, null);
46 | }
47 |
48 | private void resolveAttr(Context context, AttributeSet attrs) {
49 | TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.ScratchCard);
50 | mDrawable = typedArray.getDrawable(R.styleable.ScratchCard_scratchDrawable);
51 | mScratchWidth = typedArray.getDimension(R.styleable.ScratchCard_scratchWidth, Utils.dipToPx(context, 70));
52 | typedArray.recycle();
53 | }
54 |
55 | public void setOnScratchListener(OnScratchListener listener) {
56 | mListener = listener;
57 | }
58 |
59 | @Override
60 | protected void onSizeChanged(int width, int height, int oldWidth, int oldHeight) {
61 | super.onSizeChanged(width, height, oldWidth, oldHeight);
62 |
63 | if (mBitmap != null)
64 | mBitmap.recycle();
65 |
66 | mBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
67 | mCanvas = new Canvas(mBitmap);
68 |
69 | if (mDrawable != null) {
70 | mDrawable.setBounds(0, 0, mBitmap.getWidth(), mBitmap.getHeight());
71 | mDrawable.draw(mCanvas);
72 | } else {
73 | mCanvas.drawColor(0xFFEC7063);
74 | }
75 |
76 | if (mPath == null) {
77 | mPath = new Path();
78 | }
79 |
80 | if (mInnerPaint == null) {
81 | mInnerPaint = new Paint();
82 | mInnerPaint.setAntiAlias(true);
83 | mInnerPaint.setDither(true);
84 | mInnerPaint.setStyle(Paint.Style.STROKE);
85 | mInnerPaint.setFilterBitmap(true);
86 | mInnerPaint.setStrokeJoin(Paint.Join.ROUND);
87 | mInnerPaint.setStrokeCap(Paint.Cap.ROUND);
88 | mInnerPaint.setStrokeWidth(mScratchWidth);
89 | mInnerPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
90 | }
91 |
92 | if (mOuterPaint == null) {
93 | mOuterPaint = new Paint();
94 | }
95 | }
96 |
97 | private float mLastTouchX;
98 | private float mLastTouchY;
99 |
100 | @Override
101 | public boolean onTouchEvent(MotionEvent event) {
102 | float currentTouchX = event.getX();
103 | float currentTouchY = event.getY();
104 |
105 | switch (event.getAction()) {
106 | case MotionEvent.ACTION_DOWN:
107 | mPath.reset();
108 | mPath.moveTo(event.getX(), event.getY());
109 | break;
110 | case MotionEvent.ACTION_MOVE:
111 | float dx = Math.abs(currentTouchX - mLastTouchX);
112 | float dy = Math.abs(currentTouchY - mLastTouchY);
113 | if (dx >= 4 || dy >= 4) {
114 | float x1 = mLastTouchX;
115 | float y1 = mLastTouchY;
116 | float x2 = (currentTouchX + mLastTouchX) / 2;
117 | float y2 = (currentTouchY + mLastTouchY) / 2;
118 | mPath.quadTo(x1, y1, x2, y2);
119 | }
120 | break;
121 | case MotionEvent.ACTION_UP:
122 | mPath.lineTo(currentTouchX, currentTouchY);
123 | if (mListener != null) {
124 | int width = mBitmap.getWidth();
125 | int height = mBitmap.getHeight();
126 | int total = width * height;
127 | int count = 0;
128 | for (int i = 0; i < width; i += 3) {
129 | for (int j = 0; j < height; j += 3) {
130 | if (mBitmap.getPixel(i, j) == 0x00000000)
131 | count++;
132 | }
133 | }
134 | mListener.onScratch(this, ((float) count) / total * 9);
135 | }
136 | break;
137 | }
138 |
139 | mCanvas.drawPath(mPath, mInnerPaint);
140 | mLastTouchX = currentTouchX;
141 | mLastTouchY = currentTouchY;
142 |
143 | invalidate();
144 | return true;
145 | }
146 |
147 | @Override
148 | protected void onDraw(Canvas canvas) {
149 | canvas.drawBitmap(mBitmap, 0, 0, mOuterPaint);
150 | super.onDraw(canvas);
151 | }
152 |
153 | @Override
154 | protected void onDetachedFromWindow() {
155 | super.onDetachedFromWindow();
156 | if (mBitmap != null) {
157 | mBitmap.recycle();
158 | mBitmap = null;
159 | }
160 | }
161 | }
162 |
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/app/src/main/java/com/shubham/mahalkar/scratchcarddemo/Utils.java:
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1 | package com.shubham.mahalkar.scratchcarddemo;
2 |
3 | import android.content.Context;
4 |
5 | import java.util.Random;
6 |
7 | /**
8 | * Created by shubham on 25,April,2020
9 | */
10 | public class Utils {
11 | static Random random = new Random();
12 |
13 | public static float dipToPx(Context context, float dipValue) {
14 | float density = context.getResources().getDisplayMetrics().density;
15 | return dipValue * density;
16 | }
17 |
18 |
19 | //Generate random number(Prize)
20 | private static String generateCodePart(int min, int max) {
21 | int minNumber = 1;
22 | int maxNumber = 100;
23 | return String.valueOf((random.nextInt((maxNumber - minNumber) + 1) + minNumber));
24 | }
25 |
26 | public static String generateNewCode() {
27 | String firstCodePart = generateCodePart(1000, 9999);
28 | return "You Won\nRs." + firstCodePart;
29 | }
30 | }
31 |
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