我正在创建cameraX视图，以便通过桥接来反应本机。（普通视图在RN中渲染。桥接流程很好。）PreviewView用于显示 CameraX 预览的相机源。我已成功实现预览，但不确定为什么预览未在 UI 上呈现。它只是一个空白屏幕。
让我知道 UI 原生组件的正确实现方式。我在活动和工作中也厌倦了同样的事情。我是android平台的新手。提前致谢！
https://groups.google.com/a/android.com/g/camerax-developers/c/G9jKs1Bo_CE检查了这个。但不确定问题是否出在重新布局上。
从 NativeCameraView 类记录：
23:21:45.415 8026-8026/com.app D/PreviewView: Surface requested by Preview.
11-11 23:21:45.415 8026-8784/com.app D/UseCaseAttachState: All use case: [androidx.camera.core.Preview-ee9dbc80-160c-45e5-a38f-e68bc8f54373, androidx.camera.core.Preview-3e33af92-3cb6-4cb4-a0c3-dfb4e3c6cc8d] for camera: 0
11-11 23:21:45.415 8026-8784/com.app D/UseCaseAttachState: Active and attached use case: [androidx.camera.core.Preview-3e33af92-3cb6-4cb4-a0c3-dfb4e3c6cc8d] for camera: 0
11-11 23:21:45.416 8026-8784/com.app D/UseCaseAttachState: All use case: [androidx.camera.core.Preview-ee9dbc80-160c-45e5-a38f-e68bc8f54373, androidx.camera.core.Preview-3e33af92-3cb6-4cb4-a0c3-dfb4e3c6cc8d] for camera: 0
11-11 23:21:45.416 8026-8784/com.app D/UseCaseAttachState: Active and attached use case: [androidx.camera.core.Preview-ee9dbc80-160c-45e5-a38f-e68bc8f54373, androidx.camera.core.Preview-3e33af92-3cb6-4cb4-a0c3-dfb4e3c6cc8d] for camera: 0
11-11 23:21:45.417 8026-8784/com.app D/UseCaseAttachState: Active and attached use case: [androidx.camera.core.Preview-ee9dbc80-160c-45e5-a38f-e68bc8f54373, androidx.camera.core.Preview-3e33af92-3cb6-4cb4-a0c3-dfb4e3c6cc8d] for camera: 0
11-11 23:21:50.459 8026-8785/com.app E/Camera2CameraImpl: Unable to configure camera 0, timeout!
来自相机活动的日志：
11-12 22:55:40.545 6445-6445/com.app D/ReactVideoEvents: onHostPause
11-12 22:55:40.592 6445-7585/com.app D/UseCaseAttachState: All use case: [androidx.camera.core.Preview-62b1221e-ac9f-4bc8-a145-f0dcb1f2e162] for camera: 0
11-12 22:55:40.593 6445-7585/com.app D/UseCaseAttachState: Active and attached use case: [] for camera: 0
11-12 22:55:40.593 6445-7585/com.app D/UseCaseAttachState: All use case: [androidx.camera.core.Preview-62b1221e-ac9f-4bc8-a145-f0dcb1f2e162] for camera: 0
11-12 22:55:40.601 6445-7585/com.app I/CameraManager: Using legacy camera HAL.
11-12 22:55:40.604 6445-6445/com.app D/PreviewView: Surface requested by Preview.
11-12 22:55:40.611 6445-6445/com.app D/TextureViewImpl: SurfaceTexture available. Size: 1440x1080
11-12 22:55:40.612 6445-6445/com.app D/TextureViewImpl: Surface set on Preview.
11-12 22:55:40.791 6445-7585/com.app D/UseCaseAttachState: Active and attached use case: [androidx.camera.core.Preview-62b1221e-ac9f-4bc8-a145-f0dcb1f2e162] for camera: 0
11-12 22:55:40.793 6445-7585/com.app D/UseCaseAttachState: All use case: [androidx.camera.core.Preview-62b1221e-ac9f-4bc8-a145-f0dcb1f2e162] for camera: 0
11-12 22:55:40.793 6445-7585/com.app D/CaptureSession: Opening capture session.
11-12 22:55:40.795 6445-7585/com.app I/CameraDeviceState: Legacy camera service transitioning to state CONFIGURING
11-12 22:55:40.795 6445-8660/com.app I/RequestThread-0: Configure outputs: 1 surfaces configured.
11-12 22:55:40.795 6445-8660/com.app D/Camera: app passed NULL surface
11-12 22:55:40.819 6445-7585/com.app I/CameraDeviceState: Legacy camera service transitioning to state IDLE
11-12 22:55:40.820 6445-7578/com.app D/CaptureSession: Attempting to send capture request onConfigured
11-12 22:55:40.820 6445-7578/com.app D/CaptureSession: Issuing request for session.
11-12 22:55:40.822 6445-7578/com.app I/RequestQueue: Repeating capture request set.
11-12 22:55:40.822 6445-7578/com.app D/CaptureSession: CameraCaptureSession.onConfigured() mState=OPENED
11-12 22:55:40.823 6445-7585/com.app D/CaptureSession: CameraCaptureSession.onReady() OPENED
下面是片段：
public class myNativeCameraView extends FrameLayout {
...
public myNativeCameraView(ThemedReactContext context) {
super(context);
Log.d("ReactSpoCameraManager", "myNativeCameraView 1");
mContext = context;
FrameLayout layout = (FrameLayout) LayoutInflater.from(context).inflate(R.layout.camera_layout, null);
mPreviewView = layout.findViewById(R.id.previewView);
startCamera();
setupLayoutHack();
}
private void startCamera() {
final ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(mContext);
cameraProviderFuture.addListener(new Runnable() {
@Override
public void run() {
try {
ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
bindPreview(cameraProvider);
} catch (ExecutionException | InterruptedException e) {}
}
}, ContextCompat.getMainExecutor(mContext));
}
void bindPreview(@NonNull ProcessCameraProvider cameraProvider) {
mPreviewView.setPreferredImplementationMode(PreviewView.ImplementationMode.SURFACE_VIEW);
Preview preview = new Preview.Builder().build();
CameraSelector cameraSelector = new CameraSelector.Builder()
.requireLensFacing(CameraSelector.LENS_FACING_BACK)
.build();
ImageAnalysis imageAnalysis = new ImageAnalysis.Builder()
.build();
ImageCapture.Builder builder = new ImageCapture.Builder();
preview.setSurfaceProvider(mPreviewView.createSurfaceProvider());
Camera camera = cameraProvider.bindToLifecycle((AppCompatActivity) mContext.getCurrentActivity(), cameraSelector, preview, imageAnalysis);
}
}
我正在调用这个setupLayoutHack after startCamera在构造函数中。确定问题是否出在 React Native 中的重新布局上。但仍然面临同样的错误。
void setupLayoutHack() {
Choreographer.getInstance().postFrameCallback(new Choreographer.FrameCallback() {
@Override
public void doFrame(long frameTimeNanos) {
// Log.d(TAG, "setupLayoutHack");
manuallyLayoutChildren();
getViewTreeObserver().dispatchOnGlobalLayout();
Choreographer.getInstance().postFrameCallback(this);
}
});
}
void manuallyLayoutChildren() {
for (int i = 0; i < getChildCount(); i++) {
Log.d(TAG, "manuallyLayoutChildren");
View child = getChildAt(i);
child.measure(MeasureSpec.makeMeasureSpec(getMeasuredWidth(), MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(getMeasuredHeight(), MeasureSpec.EXACTLY));
child.layout(0, 0, child.getMeasuredWidth(), child.getMeasuredHeight());
}
}
