title: QML Camera focus doesn't work
body: <p>How to focus with QML <code>Camera</code> on Android? I've tried all <code>focusMode</code> but nothing works. Camera apps correctly focus on my device.</p>
  
  <p>Here my QML file:</p>
  
  <pre><code>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();
              }
          }
      }
  }
  </code></pre>