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将 Android CameraX 桥接到 React Native

[英]Bridging Android CameraX into React Native

 原文  2020-09-26 13:55:23  3   1    java/ react-native/ androidx/ android-camerax/ react-native-native-ui-component

问题描述

I am creating a native UI component for CameraX to React Native.我正在为 CameraX 创建一个本机 UI 组件以响应本机。 First tried triggering in activity to check and worked fine.首先尝试在活动中触发以检查并正常工作。 Looking out to extract as UI View for React Native.希望提取为 React Native 的 UI 视图。 Its just showing a blank white screen.它只是显示一个空白的白色屏幕。

  • camera preview is not showing (100% w and h for view styles are defined in JS)?相机预览未显示（100% w 和 h 的视图样式在 JS 中定义）？
//bind to lifecycle:
CameraX.bindToLifecycle((AppCompatActivity) mContext.getCurrentActivity(), preview);

My snippet below:我的片段如下：

camera_layout:相机布局：

<androidx.constraintlayout.widget.ConstraintLayout ...>
    <TextureView android:id="@+id/textureView" ... />
</androidx.constraintlayout.widget.ConstraintLayout>

CameraXView :相机X视图：

public class CameraXView extends View {
    private static final String TAG =  ReactContextBaseJavaModule.class.getSimpleName();
    TextureView textureView;
    Preview preview;
    ThemedReactContext mContext;

    public CameraXView(ThemedReactContext context) {
        super(context);
        mContext = context;
        ConstraintLayout layout = (ConstraintLayout) LayoutInflater.from(context).inflate(R.layout.camera_layout, null);
        textureView = layout.findViewById(R.id.textureView);
        startCamera();
    }
}

Start CameraX functionalities:启动 CameraX 功能：

public void startCamera() {
        CameraX.unbindAll();
        
        Rational aspectRatio = new Rational(textureView.getWidth(), textureView.getHeight());
        Size screen = new Size(textureView.getWidth(), textureView.getHeight()); //size of the screen

        PreviewConfig pConfig = new PreviewConfig.Builder().setTargetAspectRatio(aspectRatio).setTargetResolution(screen).build();
        Preview preview = new Preview(pConfig);

        preview.setOnPreviewOutputUpdateListener(
                new Preview.OnPreviewOutputUpdateListener() {
                    @Override
                    public void onUpdated(Preview.PreviewOutput output) {
                        ViewGroup parent = (ViewGroup) textureView.getParent();
                        parent.removeView(textureView);
                        parent.addView(textureView, 0);

                        textureView.setSurfaceTexture(output.getSurfaceTexture());
                        updateTransform();
                    }
                });

        //bind to lifecycle:
        CameraX.bindToLifecycle((AppCompatActivity) mContext.getCurrentActivity(), preview);
    }

ReactViewManager : Passing current activity from reactContext to view instance ReactViewManager ：将当前活动从 reactContext 传递到视图实例

public class ReactCameraXManager extends SimpleViewManager<CameraXView> implements LifecycleEventListener {
   public static final String TAG = ReactContextBaseJavaModule.class.getSimpleName();
   public static final String REACT_CLASS = "CameraXView";
   private Activity mActivity;

   public ReactCameraXManager(ReactApplicationContext reactContext) {
       super();
       mActivity = reactContext.getCurrentActivity();
       reactContext.addLifecycleEventListener(this);
   }

   @Override
   public String getName() {
       return REACT_CLASS;
   }

   @Override
   public CameraXView createViewInstance(final ThemedReactContext context) {
       return new CameraXView(context);
   }

Actual Log after camera view rendered:渲染相机视图后的实际日志：

09-26 20:15:18.994 8156-8178/com.app D/Camera: Use cases [Preview:androidx.camera.core.Preview-e0193733-9ece-4c39-85e5-b93a6f2bf2e1] OFFLINE for camera 0
09-26 20:15:18.994 8156-8178/com.app D/Camera: Closing camera: 0
09-26 20:15:18.995 8156-8178/com.app I/RequestQueue: Repeating capture request cancelled.
09-26 20:15:19.174 8156-8168/com.app E/BufferQueueProducer: [SurfaceTexture-1-8156-4] cancelBuffer: BufferQueue has been abandoned
09-26 20:15:19.174 8156-8169/com.app E/BufferQueueProducer: [SurfaceTexture-1-8156-4] cancelBuffer: BufferQueue has been abandoned
09-26 20:15:19.174 8156-8191/com.app E/BufferQueueProducer: [SurfaceTexture-1-8156-4] cancelBuffer: BufferQueue has been abandoned
09-26 20:15:19.174 8156-8168/com.app E/BufferQueueProducer: [SurfaceTexture-1-8156-4] cancelBuffer: BufferQueue has been abandoned
09-26 20:15:19.175 8156-8169/com.app E/BufferQueueProducer: [SurfaceTexture-1-8156-4] cancelBuffer: BufferQueue has been abandoned
09-26 20:15:19.175 8156-8191/com.app E/BufferQueueProducer: [SurfaceTexture-1-8156-4] cancelBuffer: BufferQueue has been abandoned
09-26 20:15:19.208 8156-8178/com.app D/Camera: Closing Capture Session
09-26 20:15:19.209 8156-8178/com.app D/Camera: CameraDevice.onClosed(): 0
09-26 20:15:19.209 8156-8178/com.app D/Camera: Closing Capture Session
09-26 20:15:19.216 8156-8178/com.app D/Camera: Use cases [Preview:androidx.camera.core.Preview-a29229b4-7347-4920-8407-d60e97ec229b] ONLINE for camera 0
09-26 20:15:19.216 8156-8178/com.app D/Camera: Opening camera: 0
09-26 20:15:19.216 8156-8178/com.app D/UseCaseAttachState: All use case: [androidx.camera.core.Preview-a29229b4-7347-4920-8407-d60e97ec229b] for camera: 0
09-26 20:15:19.230 8156-8178/com.app I/CameraManager: Using legacy camera HAL.
09-26 20:15:19.432 8156-8178/com.app D/UseCaseAttachState: Active and online use case: [] for camera: 0
09-26 20:15:19.432 8156-8178/com.app D/UseCaseAttachState: All use case: [androidx.camera.core.Preview-a29229b4-7347-4920-8407-d60e97ec229b] for camera: 0
09-26 20:15:19.432 8156-8178/com.app D/Camera: Closing Capture Session
09-26 20:15:19.432 8156-8178/com.app D/Camera: CameraDevice is null
09-26 20:15:19.432 8156-8178/com.app D/Camera: Use case Preview:androidx.camera.core.Preview-a29229b4-7347-4920-8407-d60e97ec229b ACTIVE for camera 0
09-26 20:15:19.432 8156-8178/com.app D/UseCaseAttachState: Active and online use case: [androidx.camera.core.Preview-a29229b4-7347-4920-8407-d60e97ec229b] for camera: 0
09-26 20:15:19.432 8156-8178/com.app D/Camera: CameraDevice.onOpened(): 0
09-26 20:15:19.432 8156-8178/com.app D/UseCaseAttachState: All use case: [androidx.camera.core.Preview-a29229b4-7347-4920-8407-d60e97ec229b] for camera: 0
09-26 20:15:19.432 8156-8178/com.app D/Camera: Closing Capture Session
09-26 20:15:19.433 8156-8178/com.app D/CaptureSession: Opening capture session.
09-26 20:15:19.435 8156-8178/com.app I/CameraDeviceState: Legacy camera service transitioning to state CONFIGURING
09-26 20:15:19.437 8156-9611/com.app I/RequestThread-0: Configure outputs: 1 surfaces configured.
09-26 20:15:19.437 8156-9611/com.app D/Camera: app passed NULL surface
09-26 20:15:19.465 8156-8178/com.app I/CameraDeviceState: Legacy camera service transitioning to state IDLE
09-26 20:15:19.466 8156-8178/com.app D/CaptureSession: Attempting to send capture request onConfigured
09-26 20:15:19.466 8156-8178/com.app D/CaptureSession: Issuing request for session.
09-26 20:15:19.468 8156-8178/com.app I/RequestQueue: Repeating capture request set.
09-26 20:15:19.468 8156-8178/com.app D/CaptureSession: CameraCaptureSession.onConfigured()
09-26 20:15:19.468 8156-8178/com.app D/CaptureSession: CameraCaptureSession.onReady()
09-26 20:15:19.468 8156-8178/com.app D/CaptureSession: CameraCaptureSession.onReady()
09-26 20:15:19.471 8156-9611/com.app W/LegacyRequestMapper: convertRequestMetadata - control.awbRegions setting is not supported, ignoring value
09-26 20:15:19.471 8156-9611/com.app W/LegacyRequestMapper: Only received metering rectangles with weight 0.
09-26 20:15:19.471 8156-9611/com.app W/LegacyRequestMapper: Only received metering rectangles with weight 0.
09-26 20:15:19.675 8156-9612/com.app I/CameraDeviceState: Legacy camera service transitioning to state CAPTURING
09-26 20:18:22.352 8156-8167/com.app I/art: Background partial concurrent mark sweep GC freed 483777(15MB) AllocSpace objects, 0(0B) LOS objects, 35% free, 29MB/45MB, paused 1.554ms total 104.490ms
09-26 20:19:30.100 8156-8167/com.app I/art: Background sticky concurrent mark sweep GC freed 473262(15MB) AllocSpace objects, 0(0B) LOS objects, 34% free, 29MB/45MB, paused 771us total 166.198ms
09-26 20:20:35.488 8156-8167/com.app I/art: Background partial concurrent mark sweep GC freed 491511(15MB) AllocSpace objects, 0(0B) LOS objects, 35% free, 29MB/45MB, paused 968us total 100.951ms

Note: I don't see any react-native package for this.注意：我没有看到任何 react-native 包。 So planned to create a new package.所以计划创建一个新包。

1 个解决方案

解决方案1
 0  2021-03-15 04:55:09

I found that PreviewView is not added in the parent (even getChildCount was returning 0)我发现未在父级中添加 PreviewView（甚至getChildCount返回 0）

It worked after attaching the layout with root:它在用 root 附加布局后工作：

FrameLayout layout = (FrameLayout) LayoutInflater.from(context).inflate(R.layout.camera_layout, this, true);

instead of this:而不是这个：

FrameLayout layout = (FrameLayout) LayoutInflater.from(context).inflate(R.layout.camera_layout, null);

Note: Performance is not that great.注意：性能不是那么好。 FPS is too low on most of the devices.大多数设备的 FPS 过低。

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