在Android中,重点区域参数的使用真正有用吗？

@TargetApi(Build.VERSION_CODEs.ICE_CREAM_SANDWICH)
public void setMeteringAndFocusArea (int x1,int y1,int x2,int y2,Camera camera){
    Camera.Parameters camParam = camera.getParameters();

    if (cameraParameters.getMaxNumMeteringAreas() > 0){ 
        List<Camera.Area> areas = new ArrayList<Camera.Area>();
        Rect areaRect = new Rect(x1,x2,y1,y2);   
        areas.add(new Camera.Area(areaRect,1000));
        camParam.setMeteringAreas(areas); //You can use only Focus Areas if you don't care for metering.
        camParam.setFocusAreas(areas);

        camera.setParameters(camParam);
    }

}

别忘了使用

在拍照之前,否则setFocusAreas()不会有任何影响.
请参阅this link,发布于this question,以获得良好的实施方案.