Android Camera Zoom programming steps

1. Add Camera permissions

2. Judge whether zoom is supported or not

public boolean isSupportZoom()

    {

        boolean isSuppport = true;

        if (mCamera.getParameters().isSmoothZoomSupported())

        {

            isSuppport = false;

        }

        return isSuppport;

    }

3. Modify the focal length

public void setZoom()

    {

        if (mIsSupportZoom)

        {

            try

            {

                Parameters params = mCamera.getParameters();

                final int MAX = params.getMaxZoom();

　　　　　　　　　  if(MAX==0)return;
                int zoomValue = params.getZoom();

                Trace.Log("-----------------MAX:"+MAX+"   params : "+zoomValue);

                zoomValue += 5;

                params.setZoom(zoomValue);

                mCamera.setParameters(params);

                Trace.Log("Is support Zoom " + params.isZoomSupported());

            }

            catch (Exception e)

            {

                Trace.Log("--------exception zoom");

                e.printStackTrace();

            }

        }

        else

        {

            Trace.Log("--------the phone not support zoom");

        }

    }

4. There is a situation that the system camera can zoom, but the custom camera cannot, which cannot be solved at present