如何启用 Android CameraX 供应商扩展？

Question

我正在尝试构建基于 CameraX 的相机应用，并希望为相机预览启用散景（模糊）效果。这可以通过 CameraX 扩展来完成，但是如何启用它们呢？

我在Android Developer Docs 阅读了有关供应商扩展的文章。我尝试重用他们的方法，但示例中显示的类不包含在 CameraX alpha-02

import androidx.camera.extensions.BokehExtender;

void onCreate() {
    // Create a Builder same as in normal workflow.
    ImageCaptureConfig.Builder builder = new ImageCaptureConfig.Builder();

    // Create a Extender object which can be used to apply extension
    // configurations.
    BokehImageCaptureExtender bokehImageCapture = new
            BokehImageCaptureExtender(builder);

    // Query if extension is available (optional).
    if (bokehImageCapture.isExtensionAvailable()) {
        // Enable the extension if available.
        bokehImageCapture.enableExtension();
    }

    // Finish constructing configuration with the same flow as when not using
    // extensions.
    ImageCaptureConfig config = builder.build();
    ImageCapture useCase = new ImageCapture(config);
    CameraX.bindToLifecycle((LifecycleOwner)this, useCase);
}

我预计 BokehImageCaptureExtender 将被导入，但看起来它仍然没有提供。整个包裹androidx.camera.extensions 不见了。

这些类可以在官方AndroidX git repository 找到，但如果不导入完整的 AndroidX 项目就很难设置它。

Answer 1

Android CameraX 扩展仅存在于以下版本：“1.0.0-alpha01”。

降级您的相机版本： //Camera Jetpack 库

def camerax_version = "1.0.0-alpha01"
implementation "androidx.camera:camera-core:$camerax_version"
implementation "androidx.camera:camera-camera2:$camerax_version"
implementation "androidx.camera:camera-extensions:$camerax_version"

Answer 2

我刚刚注意到编辑您的问题并查看 here 获取您显示的 代码示例 是 Java，但您将 Kotlin 作为标识符.确保您使用的是正确的语言。这可能是问题所在。

这是来自 Android Developer Docs 的 Kotlin 示例：

import androidx.camera.extensions.BokehExtender

fun onCreate() {
    // Create a Builder same as in normal workflow.
    val builder = ImageCaptureConfig.Builder()

    // Create a Extender object which can be used to apply extension
    // configurations.
    val bokehImageCapture = BokehImageCaptureExtender.create(builder)

    // Query if extension is available (optional).
    if (bokehImageCapture.isExtensionAvailable()) {
        // Enable the extension if available.
        bokehImageCapture.enableExtension()
    }

    // Finish constructing configuration with the same flow as when not using
    // extensions.
    val config = builder.build()
    val useCase = ImageCapture(config)
    CameraX.bindToLifecycle(this as LifecycleOwner, useCase)
}

这是来自Android Developer Docs的Java示例：

import androidx.camera.extensions.BokehExtender;

void onCreate() {
    // Create a Builder same as in normal workflow.
    ImageCaptureConfig.Builder builder = new ImageCaptureConfig.Builder();

    // Create a Extender object which can be used to apply extension
    // configurations.
    BokehImageCaptureExtender bokehImageCapture = new
            BokehImageCaptureExtender(builder);

    // Query if extension is available (optional).
    if (bokehImageCapture.isExtensionAvailable()) {
        // Enable the extension if available.
        bokehImageCapture.enableExtension();
    }

    // Finish constructing configuration with the same flow as when not using
    // extensions.
    ImageCaptureConfig config = builder.build();
    ImageCapture useCase = new ImageCapture(config);
    CameraX.bindToLifecycle((LifecycleOwner)this, useCase);
}

Answer 3

扩展在 google maven 上仍然不可用 https://dl.google.com/dl/android/maven2/index.html

参考这个帖子， https://stackoverflow.com/a/57177147/11861734