Move ImageMixer from java->kotlin + fix string lint issue

Author: CAMOBAP

app/src/main/java/com/camobap/imgmixer/ImageMixer.java

@@ -0,0 +1,46 @@
+package com.camobap.imgmixer
+
+import androidx.annotation.Keep
+
+import java.io.File
+
+@Keep
+class ImageMixer(width: Int, height: Int) {
+
+    @Keep
+    private var nativeHandle: Long = 0
+
+    init {
+        initialize(width, height)
+    }
+
+    fun load(imagePath: File) {
+        load0(imagePath.absolutePath)
+    }
+
+    fun convert(outFile: File) {
+        convert0(outFile.absolutePath)
+    }
+
+    @Keep
+    external fun clear()
+
+    @Keep
+    private external fun convert0(outPath: String)
+
+    @Keep
+    private external fun load0(imagePath: String)
+
+    @Keep
+    protected external fun initialize(width: Int, height: Int)
+
+    @Keep
+    @Throws(Throwable::class)
+    protected external fun finalize()
+
+    companion object {
+        init {
+            System.loadLibrary("ndk-shader-mixer")
+        }
+    }
+}

app/src/main/java/com/camobap/imgmixer/ImageMixer.kt

@@ -13,7 +13,7 @@ import androidx.core.content.FileProvider
 
 class MainActivity : AppCompatActivity() {
 
-    val imageMixer: ImageMixer = ImageMixer(1024, 1024)
+    private val imageMixer: ImageMixer = ImageMixer(1024, 1024)
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -26,16 +26,24 @@ class MainActivity : AppCompatActivity() {
         }
     }
 
-    fun doProcessing(view: View) {
+    override fun onDestroy() {
+        super.onDestroy()
+
+        imageMixer.clear()
+    }
+
+    fun doProcessing(@Suppress("UNUSED_PARAMETER") view: View) {
         val resultFile = File(filesDir, "result.bmp")
 
-        imageMixer.convert(resultFile);
+        imageMixer.convert(resultFile)
+
+        val authority = BuildConfig.APPLICATION_ID + ".provider"
+        val uri = FileProvider.getUriForFile(this, authority, resultFile.absoluteFile)
 
         val intent = Intent()
         intent.action = Intent.ACTION_VIEW
-        val uri = FileProvider.getUriForFile(this, BuildConfig.APPLICATION_ID + ".provider", resultFile.absoluteFile)
         intent.setDataAndType(uri, "image/*")
-        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
+        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
         startActivity(intent)
     }
 }

app/src/main/java/com/camobap/imgmixer/MainActivity.kt

@@ -7,7 +7,7 @@
         android:layout_height="match_parent"
         tools:context=".MainActivity">
 
-    <Button android:text="Test"
+    <Button android:text="@string/test"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             app:layout_constraintBottom_toBottomOf="parent"

app/src/main/res/layout/activity_main.xml

@@ -1,3 +1,4 @@
 <resources>
     <string name="app_name">ImageMixer</string>
+    <string name="test">Apply filter</string>
 </resources>