Dirty Kotlin Migration

gradle/libs.versions.toml

@@ -14,6 +14,8 @@ material = "1.11.0"
 constraintlayout = "2.1.4"
 test = "1.6.1"
 tesseract4android = "4.7.0"
+coreKtx = "1.13.1"
+kotlin = "2.0.0"
 
 [libraries]
 androidx-annotation = { module = "androidx.annotation:annotation", version.ref = "annotation" }
@@ -35,5 +37,7 @@ tesseract4android-jitpack = { group = "cz.adaptech.tesseract4android", name = "t
 tesseract4android-jitpack-openmp = { group = "cz.adaptech.tesseract4android", name = "tesseract4android-openmp", version.ref = "tesseract4android" }
 tesseract4android-local = { group = "cz.adaptech", name = "tesseract4android", version.ref = "tesseract4android" }
 tesseract4android-local-openmp = { group = "cz.adaptech", name = "tesseract4android-openmp", version.ref = "tesseract4android" }
+androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
 
-[plugins]
+[plugins]
+jetbrains-kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }

sample/build.gradle.kts

@@ -1,5 +1,6 @@
 plugins {
 	id("com.android.application")
+	alias(libs.plugins.jetbrains.kotlin.android)
 }
 
 android {
@@ -32,6 +33,9 @@ android {
 	buildFeatures {
 		viewBinding = true
 	}
+	kotlinOptions {
+		jvmTarget = "17"
+	}
 }
 
 // In case you are using dependency on local library (the project(":tesseract4android") below),
@@ -65,6 +69,7 @@ dependencies {
 	implementation(libs.androidx.constraintlayout)
 	implementation(libs.androidx.lifecycle.livedata)
 	implementation(libs.androidx.lifecycle.viewmodel)
+	implementation(libs.androidx.core.ktx)
 	testImplementation(libs.junit)
 	androidTestImplementation(libs.androidx.junit)
 	androidTestImplementation(libs.androidx.espresso.core)

sample/src/main/java/cz/adaptech/tesseract4android/sample/Assets.kt

@@ -0,0 +1,88 @@
+package cz.adaptech.tesseract4android.sample
+
+import android.content.Context
+import android.content.res.AssetManager
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import java.io.File
+import java.io.FileOutputStream
+import java.io.IOException
+
+object Assets {
+	/**
+	 * Returns locally accessible directory where our assets are extracted.
+	 */
+	fun getLocalDir(context: Context): File {
+		return context.filesDir
+	}
+
+	/**
+	 * Returns locally accessible directory path which contains the "tessdata" subdirectory
+	 * with *.traineddata files.
+	 */
+    @JvmStatic
+    fun getTessDataPath(context: Context): String {
+		return getLocalDir(context).absolutePath
+	}
+
+	@JvmStatic
+    fun getImageFile(context: Context): File {
+		return File(getLocalDir(context), Config.IMAGE_NAME)
+	}
+
+	@JvmStatic
+    fun getImageBitmap(context: Context): Bitmap? {
+		return BitmapFactory.decodeFile(getImageFile(context).absolutePath)
+	}
+
+	@JvmStatic
+    fun extractAssets(context: Context) {
+		val am = context.assets
+
+		val localDir = getLocalDir(context)
+		if (!localDir.exists() && !localDir.mkdir()) {
+			throw RuntimeException("Can't create directory $localDir")
+		}
+
+		val tessDir = File(getTessDataPath(context), "tessdata")
+		if (!tessDir.exists() && !tessDir.mkdir()) {
+			throw RuntimeException("Can't create directory $tessDir")
+		}
+
+		// Extract all assets to our local directory.
+		// All *.traineddata into "tessdata" subdirectory, other files into root.
+		try {
+			for (assetName in am.list("")!!) {
+				val targetFile = if (assetName.endsWith(".traineddata")) {
+					File(tessDir, assetName)
+				} else {
+					File(localDir, assetName)
+				}
+				if (!targetFile.exists()) {
+					copyFile(am, assetName, targetFile)
+				}
+			}
+		} catch (e: IOException) {
+			e.printStackTrace()
+		}
+	}
+
+	private fun copyFile(
+		am: AssetManager, assetName: String,
+		outFile: File
+	) {
+		try {
+			am.open(assetName).use { `in` ->
+				FileOutputStream(outFile).use { out ->
+					val buffer = ByteArray(1024)
+					var read: Int
+					while ((`in`.read(buffer).also { read = it }) != -1) {
+						out.write(buffer, 0, read)
+					}
+				}
+			}
+		} catch (e: IOException) {
+			e.printStackTrace()
+		}
+	}
+}

sample/src/main/java/cz/adaptech/tesseract4android/sample/Config.kt

@@ -0,0 +1,11 @@
+package cz.adaptech.tesseract4android.sample
+
+import com.googlecode.tesseract.android.TessBaseAPI
+
+object Config {
+	const val TESS_ENGINE: Int = TessBaseAPI.OEM_LSTM_ONLY
+
+	const val TESS_LANG: String = "eng"
+
+	const val IMAGE_NAME: String = "sample.jpg"
+}

sample/src/main/java/cz/adaptech/tesseract4android/sample/MainActivity.kt

@@ -0,0 +1,17 @@
+package cz.adaptech.tesseract4android.sample
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import cz.adaptech.tesseract4android.sample.ui.main.MainFragment
+
+class MainActivity : AppCompatActivity() {
+	override fun onCreate(savedInstanceState: Bundle?) {
+		super.onCreate(savedInstanceState)
+		setContentView(R.layout.activity_main)
+		if (savedInstanceState == null) {
+			supportFragmentManager.beginTransaction()
+				.replace(R.id.container, MainFragment.newInstance())
+				.commitNow()
+		}
+	}
+}