如何通过 android 的 camera2 中的代码更改焦点？

Question

我想在 android 的相机应用程序中实现一个功能，我可以单击一个按钮，然后获得 2 张不同焦点的照片（不是手动对焦功能）。

除了我的focus change部分不行运行，我都补齐了，找不到原因，尝试分析一下：

尝试1：我使用 and this中的焦点控制代码来改变焦点，但是没有用。

摄像头制作套件部分：

private CaptureRequest.Builder initDngBuilder() {
    CaptureRequest.Builder captureBuilder = null;
    try {
        captureBuilder = mCameraSession.getDevice().createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);

        captureBuilder.addTarget(mImageReader.getSurface());
        captureBuilder.addTarget(surface);
        // Required for RAW capture
        captureBuilder.set(CaptureRequest.STATISTICS_LENS_SHADING_MAP_MODE, CaptureRequest.STATISTICS_LENS_SHADING_MAP_MODE_ON);
        captureBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF);
        captureBuilder.set(CaptureRequest.CONTROL_AF_MODE, CameraMetadata.CONTROL_AF_MODE_OFF);
        captureBuilder.set(CaptureRequest.LENS_FOCUS_DISTANCE, 0.1f);
        captureBuilder.set(CaptureRequest.SENSOR_EXPOSURE_TIME, (long) ((214735991 - 13231) / 2));
        captureBuilder.set(CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, 0);
        captureBuilder.set(CaptureRequest.SENSOR_SENSITIVITY, (10000 - 100) / 2);
        captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, 90);
        CameraManager cameraManager = (CameraManager) getActivity().getSystemService(Context.CAMERA_SERVICE);
        String cameraid = CameraCharacteristics.LENS_FACING_FRONT + "";
        CameraCharacteristics cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraid);
        Range<Integer> fps[] = cameraCharacteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);
        captureBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, fps[fps.length - 1]);
    } catch (CameraAccessException e) {
        Toast.makeText(getActivity(), "reject", Toast.LENGTH_SHORT).show();
    } catch (NullPointerException e) {
        Toast.makeText(getActivity(), "fail", Toast.LENGTH_SHORT).show();
    }
    return captureBuilder;}
private CaptureRequest.Builder initDngBuilder2() {
CaptureRequest.Builder captureBuilder = null;
try {
    captureBuilder = mCameraSession.getDevice().createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
    captureBuilder.addTarget(mImageReader.getSurface());
    captureBuilder.addTarget(surface);
    // Required for RAW capture
    captureBuilder.set(CaptureRequest.STATISTICS_LENS_SHADING_MAP_MODE, CaptureRequest.STATISTICS_LENS_SHADING_MAP_MODE_ON);
    captureBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF);
    captureBuilder.set(CaptureRequest.CONTROL_AF_MODE, CameraMetadata.CONTROL_AF_MODE_OFF);
    captureBuilder.set(CaptureRequest.LENS_FOCUS_DISTANCE, 100.0f);
    captureBuilder.set(CaptureRequest.SENSOR_EXPOSURE_TIME, (long) ((214735991 - 13231) / 2));
    captureBuilder.set(CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, 0);
    captureBuilder.set(CaptureRequest.SENSOR_SENSITIVITY, (10000 - 100) / 2);
    captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, 90);
    CameraManager cameraManager = (CameraManager) getActivity().getSystemService(Context.CAMERA_SERVICE);
    String cameraid = CameraCharacteristics.LENS_FACING_FRONT + "";
    CameraCharacteristics cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraid);
    Range<Integer> fps[] = cameraCharacteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);
    captureBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, fps[fps.length - 1]);
} catch (CameraAccessException e) {
    Toast.makeText(getActivity(), "reject", Toast.LENGTH_SHORT).show();
} catch (NullPointerException e) {
    Toast.makeText(getActivity(), "fail", Toast.LENGTH_SHORT).show();
}
return captureBuilder;

}

点击监听部分：

private View.OnClickListener picOnClickListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
    try {
        mCameraSession.capture(initDngBuilder().build(), null, mHandler);
        mCameraSession.capture(initDngBuilder2().build(), null, mHandler);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}};

尝试 2：我想弄清楚我的 android 设备是否没有能力（我认为这一点是因为：），所以我使用：

int[] ints = mCameraCharacteristics.get(CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES);

for (int i = 0; i < ints.length; i++){
    Log.d(TAG, ints[i] + ",");
}

而我只得到了：“0，”。这是否意味着设备没有 'MANUAL_SENSOR' 的能力？

Answer 1

是的，如果REQUEST_AVAILABLE_CAPABILITIES的内容只包含BACKWARD_COMPATIBLE（0），那么设备不支持MANUAL_SENSOR。

因此，不支持将 LENS_FOCUS_DISTANCE 设置为 0.0f（无限远焦点）以外的任何值。

如何通过 android 的 camera2 中的代码更改焦点？

How to chang focus by code in camera2 of android?

android

focus

android-camera2