java - Android FrameLayout.addView(camera_view) crashes app -

i'm creating app has camera built myself using camera preview. , works fine on android 4.1 device (the camera opens , takes photos). when try on android 2.3 device, app crashes on framelayout.addview(camera_view) because when comment line app doesn't crashes. here's code (the measures fit device screen):

private void setupcamera() {      camera_view = new camerasurfaceview(getapplicationcontext());      frame_layout = (framelayout) findviewbyid(r.id.image_frame);      // v it's square draw     v.getlayoutparams().width = (int) ((720/4) + (5*screendensity));     v.getlayoutparams().height = (int) ((720/4) + (5*screendensity));      // img it's imageview display photo     img.getlayoutparams().width = (int) (720/4);     img.getlayoutparams().height = (int) (720/4);      frame_layout.getlayoutparams().width = (int) (720/4);     frame_layout.getlayoutparams().height = (int) (960/4);      frame_layout.addview(camera_view);  } 

here camera_view class:

public class camerasurfaceview extends surfaceview implements surfaceholder.callback{      private surfaceholder m_holder;     public camera camera = null;      public camerasurfaceview(context context) {          super(context);         m_holder = getholder();         m_holder.addcallback(this);      }      @override     public void surfacechanged(surfaceholder holder, int format, int width, int height) {          camera.parameters params = camera.getparameters();          if (this.getresources().getconfiguration().orientation != configuration.orientation_landscape) {             camera.setdisplayorientation(90);         } else {             camera.setdisplayorientation(0);         }          params.setflashmode(camera.parameters.flash_mode_auto);         params.setfocusmode(camera.parameters.focus_mode_continuous_picture);         params.setscenemode(camera.parameters.scene_mode_auto);         params.setwhitebalance(camera.parameters.white_balance_auto);         params.setexposurecompensation(0);         params.setjpegquality(100);          list<size> sizes = params.getsupportedpicturesizes();         camera.size size = sizes.get(0);         for(int i=0;i<sizes.size();i++)         {             if(sizes.get(i).width > size.width)                size = sizes.get(i);         }          params.setpreviewsize(size.width, size.height);         params.setpicturesize(size.width, size.height);          camera.setparameters(params);         camera.startpreview();      }      @override     public void surfacecreated(surfaceholder holder) {          camera = camera.open();          try {             camera.setpreviewdisplay(m_holder);         } catch (ioexception e) {             e.printstacktrace();         }      }      @override     public void surfacedestroyed(surfaceholder holder) {          camera.stoppreview();         camera.release();         camera = null;      }      public void capture(camera.picturecallback jpeghandler){          camera.takepicture(null, null, jpeghandler);      }  }