Initial commit

.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

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+
+android {
+    compileSdkVersion 29
+    defaultConfig {
+        applicationId 'com.yariksoffice.javaopencvplaygroung'
+        minSdkVersion 16
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0"
+        multiDexEnabled true
+    }
+    buildTypes {
+        debug {
+            minifyEnabled false
+            shrinkResources false
+        }
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+        incremental true
+    }
+}
+
+dependencies {
+    implementation 'androidx.appcompat:appcompat:1.0.2'
+    implementation 'com.squareup.picasso:picasso:2.5.2'
+    implementation "com.github.chrisbanes:PhotoView:2.3.0"
+
+    implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
+    implementation 'io.reactivex.rxjava2:rxjava:2.2.11'
+
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlinVersion"
+
+    implementation 'org.bytedeco:javacv:1.4.4'
+    implementation 'org.bytedeco.javacpp-presets:opencv:4.0.1-1.4.4:android-arm64'
+    // u can drop redundant platforms here
+    implementation 'org.bytedeco.javacpp-presets:opencv:4.0.1-1.4.4:android-arm'
+    implementation 'org.bytedeco.javacpp-presets:opencv:4.0.1-1.4.4:android-x86'
+}

app/proguard-rules.pro

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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

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="com.yariksoffice.javaopencvplaygroung">
+
+    <uses-permission
+        android:name="android.permission.WRITE_EXTERNAL_STORAGE"
+        android:maxSdkVersion="18" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme"
+        tools:ignore="GoogleAppIndexingWarning">
+        <activity android:name="com.yariksoffice.javaopencvplaygroung.MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/com/yariksoffice/javaopencvplaygroung/FileUtil.kt

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+package com.yariksoffice.javaopencvplaygroung
+
+import android.content.Context
+import android.net.Uri
+import android.os.Environment
+import java.io.File
+import java.io.FileOutputStream
+import java.io.IOException
+import java.text.SimpleDateFormat
+import java.util.*
+
+class FileUtil(private val context: Context) {
+
+    @Throws(IOException::class)
+    fun urisToFiles(uris: List<Uri>): List<File> {
+        val files = ArrayList<File>(uris.size)
+        for (uri in uris) {
+            val file = createTempFile()
+            writeUriToFile(uri, file)
+            files.add(file)
+        }
+        return files
+    }
+
+    @Throws(IOException::class)
+    private fun createTempFile(): File {
+        // don't need read/write permission for this directory starting from android 19
+        val root = requirePicturesDirectory()
+        root.mkdirs() // make sure that directory exists
+
+        val date = SimpleDateFormat(DATE_FORMAT_TEMPLATE, Locale.getDefault()).format(Date())
+        val filePrefix = IMAGE_NAME_TEMPLATE.format(date)
+        return File.createTempFile(filePrefix, JPG_EXTENSION, root)
+    }
+
+    @Throws(IOException::class)
+    private fun writeUriToFile(target: Uri, destination: File) {
+        val inputStream = context.contentResolver.openInputStream(target)!!
+        val outputStream = FileOutputStream(destination)
+        inputStream.use { input ->
+            outputStream.use { out ->
+                input.copyTo(out)
+            }
+        }
+    }
+
+    fun createResultFile(): File {
+        val pictures = requirePicturesDirectory()
+        //noinspection ConstantConditions,ResultOfMethodCallIgnored
+        pictures.mkdirs()
+        return File("${pictures.absolutePath}$RESULT_FILE_NAME")
+    }
+
+    private fun requirePicturesDirectory(): File {
+        return context.getExternalFilesDir(Environment.DIRECTORY_PICTURES) ?: throw IOException(
+                "Can't access folder")
+    }
+
+    fun cleanUpWorkingDirectory() {
+        deleteFile(requirePicturesDirectory())
+    }
+
+    // there is no build in function for deleting folders. <3
+    private fun deleteFile(file: File) {
+        if (file.isDirectory) {
+            val entries = file.listFiles()
+            if (entries != null) {
+                for (entry in entries) {
+                    deleteFile(entry)
+                }
+            }
+        }
+        file.delete()
+    }
+
+    companion object {
+        private const val RESULT_FILE_NAME = "/result.jpg"
+        private const val DATE_FORMAT_TEMPLATE = "yyyyMMdd_HHmmss"
+        private const val IMAGE_NAME_TEMPLATE = "IMG_%s_"
+        private const val JPG_EXTENSION = ".jpg"
+    }
+}