Android implementation ready

Author: icc-guerrero

android/build.gradle

@@ -34,7 +34,7 @@ android {
   compileSdkVersion getExtOrIntegerDefault('compileSdkVersion')
   buildToolsVersion getExtOrDefault('buildToolsVersion')
   defaultConfig {
-    minSdkVersion 16
+    minSdkVersion 19
     targetSdkVersion getExtOrIntegerDefault('targetSdkVersion')
     versionCode 1
     versionName "1.0"
@@ -131,6 +131,7 @@ def kotlin_version = getExtOrDefault('kotlinVersion')
 dependencies {
   // noinspection GradleDynamicVersion
   api 'com.facebook.react:react-native:+'
+  implementation 'com.google.android.gms:play-services-mlkit-text-recognition:17.0.0'
   implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
   implementation "androidx.camera:camera-core:1.1.0-alpha06"
   implementation "com.facebook.react:react-native:+"  // From node_modules

android/src/main/java/com/visioncameraocr/VisionCameraOcrPlugin.kt

@@ -1,10 +1,59 @@
+import android.R.attr.label
+import android.annotation.SuppressLint
+import android.graphics.Rect
+import android.media.Image
 import androidx.camera.core.ImageProxy
+import com.facebook.react.bridge.ReadableArray
+import com.facebook.react.bridge.WritableArray
+import com.facebook.react.bridge.WritableNativeArray
+import com.facebook.react.bridge.WritableNativeMap
+import com.google.android.gms.tasks.Task
+import com.google.android.gms.tasks.Tasks
+import com.google.mlkit.vision.common.InputImage
+import com.google.mlkit.vision.text.Text
+import com.google.mlkit.vision.text.TextRecognition
+import com.google.mlkit.vision.text.TextRecognizer
+import com.google.mlkit.vision.text.latin.TextRecognizerOptions
 import com.mrousavy.camera.frameprocessor.FrameProcessorPlugin
+import com.mrousavy.camera.utils.pushInt
+
 
 class VisionCameraOcrPlugin: FrameProcessorPlugin("scanOCR") {
 
-  override fun callback(image: ImageProxy, params: Array<Any>): Any? {
-    // code goes here
-    return null
+  override fun callback(frame: ImageProxy, params: Array<Any>): Any? {
+    @SuppressLint("UnsafeOptInUsageError")
+    val mediaImage: Image? = frame.image
+    val textRecognizer: TextRecognizer = TextRecognition.getClient(TextRecognizerOptions.DEFAULT_OPTIONS)
+    val array = WritableNativeArray()
+
+
+    if (mediaImage != null) {
+      val image = InputImage.fromMediaImage(mediaImage, frame.imageInfo.rotationDegrees)
+      var task: Task<Text> = textRecognizer.process(image)
+      try {
+        var extractedInfo = Tasks.await(task)
+        for (block in extractedInfo.textBlocks) {
+          for (line in block.lines) {
+            val lineText = line.text
+            val lineBoundingBox: Rect? = line.boundingBox
+            val map = WritableNativeMap()
+            map.putString("text", lineText)
+            map.putInt("height", image.height)
+            map.putInt("width", image.width)
+            val bounds = WritableNativeArray()
+            bounds.pushInt(lineBoundingBox?.left)
+            bounds.pushInt(lineBoundingBox?.bottom)
+            bounds.pushInt(lineBoundingBox?.right)
+            bounds.pushInt(lineBoundingBox?.top)
+            map.putArray("bounds", bounds)
+            array.pushMap(map)
+          }
+        }
+      } catch (e: Exception) {
+        e.printStackTrace()
+      }
+
+    }
+    return array
   }
 }