学步园

在vendor/sec/sec_proprietary/smdkc110/libcamera/SecCameraHWInterface.cpp中，当对硬件设置完毕后，通知packages/apps/Camera/src/com/android/camera/Camera.java，zoom已经完成。

    status_t CameraHardwareSec::sendCommand(int32_t command, int32_t arg1,  
                                             int32_t arg2)  
    {  
        if( command == ZOOM_COMMAND_ID )  
        {  
            if( arg1  == mZoomLevel )  
            {  
                return NO_ERROR;  
            }  
                      
            LOGE("startZoom (%s),arg1:%ld,mZoomLevel:%ld", __FUNCTION__,arg1,mZoomLevel);  
            //mZoomLevel = arg1;  
            //mSecCamera->startZoom(mZoomLevel);  
            if( arg1>mZoomLevel )  
            {   
                LOGE("zoomIn (%s)", __FUNCTION__);  
                mZoomLevel = arg1;  
                mSecCamera->zoomIn(mZoomLevel);  
            }  
            else if( arg1<mZoomLevel )  
            {  
                LOGE("zoomOut (%s)", __FUNCTION__);  
                mZoomLevel = arg1;  
                mSecCamera->zoomOut(mZoomLevel);  
            }  
            //add by hui  
            if (mMsgEnabled & CAMERA_MSG_ZOOM)  
            mNotifyCb(CAMERA_MSG_ZOOM, true, 1, mCallbackCookie);  
        }  
        return NO_ERROR;  
    }  

应用层或者硬件层设置成功，可以对应用程序进行成功后的相关设置。例如把zoomin按钮显示出来。

private final class ZoomCallback    
        implements android.hardware.Camera.ZoomCallback {    
    public void onZoomUpdate(int zoomValue, boolean stopped,    
                             android.hardware.Camera camera) {    
        Log.v(TAG, "ZoomCallback: zoom value=" + zoomValue + ". stopped="    
                + stopped);    
        mZoomValue = zoomValue;    
        // Keep mParameters up to date. We do not getParameter again in    
        // takePicture. If we do not do this, wrong zoom value will be set.    
        mParameters.setZoom(zoomValue);    
        // We only care if the zoom is stopped. mZooming is set to true when    
        // we start smooth zoom.    
        if (stopped) mZooming = false;    
        updateZoomButtonsEnabled();    
    }    
}