Android Camera变焦编程步骤

1、添加camera权限

2、判断是否支持变焦

public boolean issupportzoom()
    {
        boolean issuppport = true;
        if (mcamera.getparameters().issmoothzoomsupported())
        {
            issuppport = false;
        }
        return issuppport;
    }

3、修改焦距

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、存在系统相机可以变焦，自定义相机不可以的情况，目前无法解决