在build.gradle文件中添加以下依赖：

dependencies {
    implementation 'androidx.camera:camera-camera2:1.0.0-beta06'
    implementation 'androidx.camera:camera-lifecycle:1.0.0-beta06'
    implementation 'androidx.camera:camera-view:1.0.0-alpha28'
}

接着，在布局文件中添加以下代码：

最后，在activity中获取PreviewView实例并将其用于相机预览：

val cameraProviderFuture = ProcessCameraProvider.getInstance(this)
val previewView = findViewById(R.id.previewView)

cameraProviderFuture.addListener({
    val cameraProvider = cameraProviderFuture.get()
    val preview = Preview.Builder()
        .build()
        .also {
            it.setSurfaceProvider(previewView.createSurfaceProvider())
        }
    val camera = cameraProvider.bindToLifecycle(
        this, CameraSelector.DEFAULT_BACK_CAMERA, preview)
}, ContextCompat.getMainExecutor(this))