intial push

Author: Vinod Baste

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

.idea/.gitignore

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+/build

.idea/compiler.xml

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+plugins {
+    id 'com.android.library'
+    id 'org.jetbrains.kotlin.android'
+}
+
+android {
+    compileSdk 31
+
+    defaultConfig {
+        minSdk 21
+        targetSdk 31
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles "consumer-rules.pro"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.core:core-ktx:1.7.0'
+    implementation 'androidx.appcompat:appcompat:1.4.2'
+    implementation 'com.google.android.material:material:1.6.1'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+}

.idea/gradle.xml

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

.idea/misc.xml

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+package com.android.imagecompressor
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.android.imagecompressor.test", appContext.packageName)
+    }
+}

ImageCompressor/.gitignore

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.imagecompressor">
+
+</manifest>

ImageCompressor/build.gradle

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+@file:Suppress("DEPRECATION")
+
+package com.android.imagecompressor
+
+import android.content.Context
+import android.graphics.*
+import android.location.Location
+import android.media.ExifInterface
+import android.net.Uri
+import android.os.Build
+import android.os.Environment
+import android.provider.MediaStore
+import android.util.Log
+import java.io.*
+import java.nio.file.Files
+import kotlin.math.roundToInt
+
+object ImageCompressUtils {
+
+    //compress the image
+    @JvmOverloads
+    fun compressImage(
+        context: Context,
+        imagePath: String?,
+        imageName: String?,
+        imageQuality: Int = 50
+    ): String {
+
+        var filePath = ""
+        try {
+            var scaledBitmap: Bitmap? = null
+            val options = BitmapFactory.Options()
+            // by setting this field as true, the actual bitmap pixels are not loaded in the memory.
+            // Just the bounds are loaded. If you try the use the bitmap here, you will get null.
+            options.inJustDecodeBounds = true
+            var actualHeight = options.outHeight
+            var actualWidth = options.outWidth
+
+            val imageFile = File(imagePath!!)
+            val fileContent = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                Files.readAllBytes(imageFile.toPath())
+            } else {
+                File(imagePath).readBytes()
+            }
+            var bmp = BitmapFactory.decodeByteArray(fileContent, 0, fileContent.size, options)
+
+            //max Height and width values of the compressed image is taken as 1024x912
+            val maxHeight = 1024.0f
+            val maxWidth = 912.0f
+            var imgRatio = actualWidth / actualHeight.toFloat()
+            val maxRatio = maxWidth / maxHeight
+
+            //width and height values are set maintaining the aspect ratio of the image
+            if (actualHeight > maxHeight || actualWidth > maxWidth) {
+                when {
+                    imgRatio < maxRatio -> {
+                        imgRatio = maxHeight / actualHeight
+                        actualWidth = (imgRatio * actualWidth).toInt()
+                        actualHeight = maxHeight.toInt()
+                    }
+                    imgRatio > maxRatio -> {
+                        imgRatio = maxWidth / actualWidth
+                        actualHeight = (imgRatio * actualHeight).toInt()
+                        actualWidth = maxWidth.toInt()
+                    }
+                    else -> {
+                        actualHeight = maxHeight.toInt()
+                        actualWidth = maxWidth.toInt()
+                    }
+                }
+            }
+
+            //setting inSampleSize value allows to load a scaled down version of the original image
+            options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight)
+            //inJustDecodeBounds set to false to load the actual bitmap
+            options.inJustDecodeBounds = false
+            //this removes the redundant quality of the image
+            options.inPurgeable = true
+            //this options allow android to claim the bitmap memory if it runs low on memory
+            options.inInputShareable = true
+
+            options.inTempStorage = ByteArray(16 * 1024)
+            try {
+                //load the bitmap from its path
+                bmp = BitmapFactory.decodeFile(imagePath, options)
+            } catch (exception: OutOfMemoryError) {
+                exception.printStackTrace()
+            }
+            try {
+                scaledBitmap =
+                    Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.ARGB_8888)
+            } catch (exception: OutOfMemoryError) {
+                exception.printStackTrace()
+            }
+            val ratioX = actualWidth / options.outWidth.toFloat()
+            val ratioY = actualHeight / options.outHeight.toFloat()
+            val middleX = actualWidth / 2.0f
+            val middleY = actualHeight / 2.0f
+            val scaleMatrix = Matrix()
+            scaleMatrix.setScale(ratioX, ratioY, middleX, middleY)
+            val canvas = Canvas(scaledBitmap!!)
+            canvas.setMatrix(scaleMatrix)
+            canvas.drawBitmap(
+                bmp,
+                middleX - bmp.width / 2,
+                middleY - bmp.height / 2,
+                Paint(Paint.FILTER_BITMAP_FLAG)
+            )
+
+            //check the rotation of the image and display it properly
+            val exif: ExifInterface
+            try {
+                exif = ExifInterface(imagePath.toString())
+                val orientation = exif.getAttributeInt(
+                    ExifInterface.TAG_ORIENTATION, 0
+                )
+                Log.d("EXIF", "Exif: $orientation")
+                val matrix = Matrix()
+                when (orientation) {
+                    6 -> {
+                        matrix.postRotate(90f)
+                        Log.d("EXIF", "Exif: $orientation")
+                    }
+                    3 -> {
+                        matrix.postRotate(180f)
+                        Log.d("EXIF", "Exif: $orientation")
+                    }
+                    8 -> {
+                        matrix.postRotate(270f)
+                        Log.d("EXIF", "Exif: $orientation")
+                    }
+                }
+                scaledBitmap = Bitmap.createBitmap(
+                    scaledBitmap, 0, 0,
+                    scaledBitmap.width, scaledBitmap.height, matrix,
+                    true
+                )
+            } catch (e: IOException) {
+                e.printStackTrace()
+            } catch (e: java.lang.Exception) {
+                e.printStackTrace()
+            }
+            val out: FileOutputStream?
+            filePath = imageName?.let { getOutputMediaFile(it, context) }!!.absolutePath
+            try {
+                out = FileOutputStream(filePath)
+
+                //write the compressed bitmap at the destination specified by filename.
+                scaledBitmap!!.compress(Bitmap.CompressFormat.JPEG, imageQuality, out)
+            } catch (e: FileNotFoundException) {
+                e.printStackTrace()
+            }
+        } catch (e: java.lang.Exception) {
+            e.printStackTrace()
+        }
+
+        return filePath
+    }
+
+}
+
+private fun getOutputMediaFile(imageName: String, context: Context): File? {
+    var imageFile1: File? = null
+    try {
+        imageFile1 = createImageFile(context, imageName)
+    } catch (e: IOException) {
+        e.printStackTrace()
+    }
+    if (imageFile1!!.exists()) imageFile1.delete()
+    var imageNew: File? = null
+    try {
+        imageNew = createImageFile(context, imageName)
+    } catch (e: IOException) {
+        e.printStackTrace()
+    }
+    return imageNew
+}
+
+private fun calculateInSampleSize(
+    options: BitmapFactory.Options,
+    reqWidth: Int,
+    reqHeight: Int
+): Int {
+    val height = options.outHeight
+    val width = options.outWidth
+    var inSampleSize = 1
+    try {
+        if (height > reqHeight || width > reqWidth) {
+            val heightRatio =
+                (height.toFloat() / reqHeight.toFloat()).roundToInt()
+            val widthRatio =
+                (width.toFloat() / reqWidth.toFloat()).roundToInt()
+            inSampleSize = if (heightRatio < widthRatio) heightRatio else widthRatio
+        }
+        val totalPixels = width * height.toFloat()
+        val totalReqPixelsCap = reqWidth * reqHeight * 2.toFloat()
+        while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
+            inSampleSize++
+        }
+    } catch (e: java.lang.Exception) {
+        e.printStackTrace()
+    }
+    return inSampleSize
+}
+
+@Throws(IOException::class)
+private fun createImageFile(context: Context, FileName: String): File {
+    return File(
+        context.getExternalFilesDir(Environment.DIRECTORY_PICTURES)
+            .toString() + File.separator + FileName + ".png"
+    )
+}

ImageCompressor/consumer-rules.pro

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+package com.android.imagecompressor
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}

ImageCompressor/proguard-rules.pro

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+/build