android - QML 相机对焦不起作用

Question

如何在 Android 上使用 QML Camera 对焦？我已经尝试了所有的 focusMode 但没有任何效果。相机应用正确聚焦在我的设备上。

这是我的 QML 文件:

import QtQuick 2.3
import QtMultimedia 5.2

Item {
    property int scanerButtonWidth: 80
    property int scanerButtonHeight: 60

    Rectangle {
        width: parent.width
        height: scanerButtonHeight + 10
        color: Qt.rgba(0,0,0,1)
    }

    VideoOutput {
        width: parent.width
        height: parent.height
        source: camera
        anchors.fill: parent
        autoOrientation: true
    }

    Camera {
        id: camera
        imageProcessing.whiteBalanceMode: CameraImageProcessing.WhiteBalanceFlash
        captureMode: Camera.CaptureStillImage
        exposure {
            exposureMode: Camera.ExposureAuto
        }

        focus {
            focusMode: Camera.FocusContinuous
            focusPointMode: Camera.FocusPointCenter
        }

        imageCapture {
            onImageCaptured: {
                otpGeneratorApp.scanedQR_Code( preview, false, type )
                qrCodeScanner.visible = false
            }
        }
    }


    Rectangle {
        width: parent.width
        height: scanerButtonHeight + 10
        y: parent.height - ( height )
        color: Qt.rgba(0,0,0,1)

        Button {
            id: captureButton;
            width: scanerButtonWidth;
            height: scanerButtonHeight;
            x: parent.width * 0.5 - ( width / 2);
            y: parent.height - ( height + 5);
            text: qsTr( "[O]" );
            onClicked: {
                 camera.imageCapture.capture();
            }
        }

        Button {
            id: focus
            width: scanerButtonWidth;
            height: scanerButtonHeight;
            text: qsTr("Focus");
            x: captureButton.x + ( captureButton.width + 10 );
            y: parent.height - ( height + 5);
            onClicked: {
                 camera.searchAndLock();
            }
        }
    }
}

Answer 1

如果您使用的是 Qt 5.4 或更低版本，则不能。 QCamera 中存在阻止触发自动对焦的错误。查看错误和解决方法 here .

合并了一个解决方案，解决了Qt 5.5以来的bug。