Question

我对AutoFocus的安照相机信号感到有些麻烦。在我的Preview级的构造中,我为FOCUS_确定了重点模式。 MODE_AUTO and the闪电模式 to FLASH_MODE_AUTO. 提供给用户的图顿一附有习俗估计。当用户向纽顿报到时,电离层开始,汽车重点也一样:

public void onAnimationStart(Animation animation) {
    isAutoFocusing = true;
    AutoFocusCallBackImpl autoFocusCallBack = new AutoFocusCallBackImpl();
    camera.autoFocus(autoFocusCallBack);
}

然后,在奥托托基办法中,我看一看:

public void onAutoFocus(boolean success, Camera camera) {
    if (camera != null) {
        try {
            camera.takePicture(shutterCallback, rawCallback, jpegCallback);
        } catch(Exception e) {
             // If something went wrong, we return
            // the user to the dashboard.
            setResult(Constants.PICTURE_CAMERA_ERROR);
            finish();
        }
    }
}

当有足够的光灯(没有闪光)时,这项工作是完美的。然而,在黑暗中,闪光消失,照片被拍摄,但照相照相照相看看不到。我知道,如果汽车焦点得到照相机的支持,那么就立即叫上AutoFocus的警示,但这里的情况显然如此。是否在黑暗中不可能把汽车集中起来(甚至与闪电一样)?

Answer 1

This obviously is a hardware issue: To focus automatically, your device needs an image. No image (in the dark) -> no autofocus. There is no way for the camera to tell whether the image is sharp if there is no image, that s why focusing in the dark does not work. That s why cameras (and I guess some android devices too) have a small light which gets switched on while focusing. But I guess most phones don t have this focus-light :/

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