Question

我试图像在Camera2 API中一样，对CameraX进行手动对焦

在Camera2 API中，我使用以下代码

final CaptureRequest.Builder captureBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE); 

captureBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_OFF); 

captureBuilder.set(CaptureRequest.LENS_FOCUS_DISTANCE, mLensFocusDistance);

可以在android camera X中完成手动对焦吗？如果是这样

预先感谢

Answer 1

您应该将TouchListener设置为textureView，然后设置focus（Kotlin）：

private fun setUpTapToFocus() {
    textureView.setOnTouchListener { _, event ->
        if (event.action != MotionEvent.ACTION_UP) {
            return false
        }

        val cameraControl = CameraX.getCameraControl(CameraX.LensFacing.BACK) // you can set it to front                     
        val factory = TextureViewMeteringPointFactory(textureView)
        val point = factory.createPoint(event.x, event.y)
        val action = FocusMeteringAction.Builder.from(point).build()
        cameraControl.startFocusAndMetering(action)
        return true
    }
}

希望有帮助

Answer 2

有一种方法可以通过使用Camera2Interop.Extender访问低级camera2 API在cameraX中使用手动对焦。您应该设置两个额外的选项来预览构建器，例如：

void setFocusDistance(ExtendableBuilder<?> builder, float distance) {
    Camera2Interop.Extender extender = new Camera2Interop.Extender(builder);
    extender.setCaptureRequestOption(CaptureRequest.CONTROL_AF_MODE, CameraMetadata.CONTROL_AF_MODE_OFF);
    extender.setCaptureRequestOption(CaptureRequest.LENS_FOCUS_DISTANCE, distance);
}

并在构建cameraX预览请求时使用它：

float focusDistance = 0F; // example: infinite focus
Preview.Builder previewBuilder = new Preview.Builder();
setFocusDistance(previewBuilder, focusDistance);
preview = previewBuilder.build();
preview.setSurfaceProvider(viewFinder.getSurfaceProvider());

请注意，您还可以通过这种方式设置其他camera2 CaptureRequest选项。

如何在Android CameraX中使用手动对焦？

2 个答案: