Android CameraX GLSurfaceView

Question

拜托，有人可以提供在 GLSurfaceView 中使用 CameraX 库的好例子，找不到任何信息。

Answer 1

使用 CameraX 与自定义表面/TextureView 的文档不存在。在 CameraX 测试版发布后，许多 API 发生了变化，因此现有的在线示例仅适用于 alpha 版本。使用带有 alpha-xx 版本的 TextureView/GLSUrfaceView 的链接： https://github.com/android/camera-samples/tree/master/CameraXBasic

但是，这些示例不适用于最新的 beta-02（截至今天）版本。

请参考下面的示例，我用它来使用 CameraX API 创建纹理视图。

梯度依赖：

dependencies{
def camerax_version = "1.0.0-beta02"
.....
    implementation "androidx.camera:camera-core:$camerax_version"
    implementation "androidx.camera:camera-camera2:${camerax_version}"
    implementation "androidx.camera:camera-lifecycle:$camerax_version"
    implementation "androidx.camera:camera-view:1.0.0-alpha09"
...
}

创建一个预览活动：（Kotlin 示例，但在 Java 中类似）

class Capture : AppCompatActivity(), CameraXConfig.Provider {
    // ur code


private lateinit var cameraProviderFuture : ListenableFuture<ProcessCameraProvider>
    private lateinit var viewFinder: TextureView // Created in view file 
   // ur code


override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_capture)
        supportActionBar?.setDisplayHomeAsUpEnabled(true)

// CameraX related Code 
        cameraProviderFuture = ProcessCameraProvider.getInstance(this)
        viewFinder = findViewById(R.id.view_finder)

        cameraProviderFuture.addListener(Runnable {
            val cameraProvider = cameraProviderFuture.get()
            bindPreview(cameraProvider)
        }, ContextCompat.getMainExecutor(this))

     // ur code here 
    }
}

private fun bindPreview(cameraProvider : ProcessCameraProvider) {
        var preview : Preview = Preview.Builder()
            .build()

        var cameraSelector : CameraSelector = CameraSelector.Builder()
            .requireLensFacing(CameraSelector.LENS_FACING_BACK)
            .build()
var camera = cameraProvider.bindToLifecycle(this as LifecycleOwner, cameraSelector, preview)
        val surfaceTexture = (view_finder as TextureView).surfaceTexture
        val surface = Surface(surfaceTexture)
        val executor = Executors.newSingleThreadExecutor()
        val previewSurfaceProvider = PreviewSurfaceProvider(surface, executor)
        preview.setSurfaceProvider(executor,previewSurfaceProvider)
        cameraProvider.bindToLifecycle(this, cameraSelector, preview)
    }

现在创建一个 SurfaceProvider 类。

import android.view.Surface
import androidx.camera.core.Preview
import androidx.camera.core.SurfaceRequest
import androidx.core.util.Consumer
import java.util.concurrent.Executor
import java.util.concurrent.Executors

class PreviewSurfaceProvider (private val surface: Surface, private val executor: Executor): Preview.SurfaceProvider {

    override fun onSurfaceRequested(request: SurfaceRequest) {
        request.provideSurface(surface, executor, Consumer { result: SurfaceRequest.Result ->  {
            TODO("Not yet implemented")
        }})
    }

}

创建视图xml Activity_capture.xml：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">

    // Can be replaced with GLSurfaceView
    <TextureView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/view_finder"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

希望这可以帮助。