forked from BigfootDev/flatbuffers
0ff0471488
Android build was dated, using the Android.mk approach. Current project configuration on Android encourages the usage of CMake, so we are updating the android project as an example on how to use either the Java/Kotlin generate code or the native C++ one.
52 lines
1.6 KiB
Kotlin
52 lines
1.6 KiB
Kotlin
package com.flatbuffers.app
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import android.annotation.SuppressLint
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import androidx.appcompat.app.AppCompatActivity
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import android.os.Bundle
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import android.widget.TextView
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import com.fbs.app.Animal
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import com.google.flatbuffers.FlatBufferBuilder
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import java.nio.ByteBuffer
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@ExperimentalUnsignedTypes
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class MainActivity : AppCompatActivity() {
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@SuppressLint("SetTextI18n")
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContentView(R.layout.activity_main)
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val tiger = Animal.getRootAsAnimal(ByteBuffer.wrap(createAnimalFromJNI()))
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findViewById<TextView>(R.id.tv_animal_one).text = animalInfo(tiger)
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findViewById<TextView>(R.id.tv_animal_two).text = animalInfo(createAnimalFromKotlin())
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}
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// This function is a sample of communicating FlatBuffers between JNI (native C++) and Java.
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// Implementation can be found on animals.cpp file.
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private external fun createAnimalFromJNI(): ByteArray
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// Create a "Cow" Animal flatbuffers from Kotlin
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private fun createAnimalFromKotlin():Animal {
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val fb = FlatBufferBuilder(100)
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val cowOffset = Animal.createAnimal(
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builder = fb,
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nameOffset = fb.createString("Cow"),
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soundOffset = fb.createString("Moo"),
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weight = 720u
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)
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fb.finish(cowOffset)
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return Animal.getRootAsAnimal(fb.dataBuffer())
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}
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private fun animalInfo(animal: Animal): String =
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"The ${animal.name} sound is ${animal.sound} and it weights ${animal.weight}kg."
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companion object {
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// Used to load the 'native-lib' library on application startup.
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init {
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System.loadLibrary("native-lib")
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}
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}
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}
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