i developing app requires access camera. have accessed well. there 2 issues. preview stretched when phone vertical. secondly, camera preview isn't visible when resume app. camera.open() function opens camera not able see preview. have tried available on forum nothing solving problem.
-thanks in advance!
//camera activity file @suppresslint("simpledateformat") public class cameraactivity extends activity { private camera mcamera; private camerapreview mpreview; private framelayout preview; private button bcapture; private button bgallery; private static final string tag = "cameraactivity"; private static final int pick_image_request = 1; private textview tvcheck; public final static string extra_message = "com.epfl.mycamera.message"; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); getwindow().requestfeature(window.feature_no_title); getwindow().setflags(windowmanager.layoutparams.flag_fullscreen, windowmanager.layoutparams.flag_fullscreen); setcontentview(r.layout.activity_camera); if (checkcamerahardware(getbasecontext())){ // create instance of camera mcamera = getcamerainstance(); // create our preview view , set content of our activity. mpreview = new camerapreview(this, mcamera, cameraactivity.this); preview = (framelayout) findviewbyid(r.id.camera_preview); preview.addview(mpreview); //adding camera button bcapture = (button) findviewbyid(r.id.bcapture); //button listener storing images bcapture.setonclicklistener( new view.onclicklistener() { @override public void onclick(view v) { mcamera.takepicture(null, null, null, jpegcallback); mcamera.startpreview(); log.d(tag, "takepicture"); } }); //adding gallery button bgallery = (button) findviewbyid (r.id.bgallery); bgallery.setonclicklistener(new view.onclicklistener() { @override public void onclick(view v) { tvcheck = (textview) findviewbyid (r.id.tvcheck); selectimagefromgallery(); } }); } log.d(tag, "oncreate"); } /******************************************************************/ public void selectimagefromgallery() { intent intent = new intent(); intent.settype("image/*"); intent.setaction(intent.action_get_content); startactivityforresult(intent.createchooser(intent, "select picture"),pick_image_request); } @override protected void onactivityresult(int arequestcode, int aresultcode, intent adata) { switch (arequestcode) { case pick_image_request: handleimage(adata); break; default: tvcheck.settext("you can select images."); break; } super.onactivityresult(arequestcode, aresultcode, adata); } private void handleimage(intent adata) { if ((adata != null) && (adata.getdata() != null)) { uri selectedimage = adata.getdata(); string[] filepathcolumn = {mediacolumns.data}; cursor cursor = getcontentresolver().query(selectedimage, filepathcolumn, null, null, null); cursor.movetofirst(); log.d("imageactivity", "after extracting file path"); int columnindex = cursor.getcolumnindex(filepathcolumn[0]); string picturepath = cursor.getstring(columnindex); cursor.close(); log.d("imageactivity", "after closing cursor"); setcontentview(r.layout.activity_image_old); //setting view image imageview imgview = (imageview) findviewbyid(r.id.ivgallery); imgview.setimagebitmap(bitmapfactory.decodefile(picturepath)); button blivecamera = (button) findviewbyid(r.id.bcamerapreview); blivecamera.setonclicklistener(new view.onclicklistener() { @override public void onclick(view v) { setcontentview(r.layout.activity_camera); mcamera.startpreview(); } }); } else { tvcheck.settext("you did not select image"); } } /****************************************************************/ /** stores jpeg picture */ picturecallback jpegcallback = new picturecallback() { public void onpicturetaken(byte[] data, camera camera) { try { file mediastoragedir = new file(environment .getexternalstoragepublicdirectory(environment.directory_pictures),"mycamera"); // saving image sd card file operation string timestamp = new simpledateformat("yyyymmdd_hhmmss").format(new date()); file mediafile; mediafile = new file(mediastoragedir.getpath() + file.separator +"img_"+ timestamp + ".jpg"); fileoutputstream outstream = new fileoutputstream(mediafile); outstream.write(data); outstream.close(); sendbroadcast(new intent(intent.action_media_mounted, uri.parse("file://"+ environment.getexternalstoragedirectory()))); log.d(tag, "onpicturetaken - wrote bytes: " + data.length); } catch (filenotfoundexception e) { e.printstacktrace(); } catch (ioexception e) { e.printstacktrace(); } { } log.d(tag, "onpicturetaken - jpeg"); } }; /***************************************************************/ /** check if device has camera */ private boolean checkcamerahardware(context context) { if (context.getpackagemanager().hassystemfeature(packagemanager.feature_camera)){ log.d(tag, "camera available"); return true; } else { log.d(tag, "no camera found"); return false; } } /** safe way instance of camera object. */ public camera getcamerainstance(){ camera c = null; try { int = camera.getnumberofcameras(); releasecamera(); //in case camera being accessed other app. log.d(tag, "number of cameras "+i +"\n"); c = camera.open(); // attempt camera instance log.d(tag, "camera opened"); } catch (exception e){ log.d(tag, "camera can't accessed"); } return c; // returns null if camera unavailable } @override protected void onpause() { super.onpause(); releasecamera(); // release camera on pause event } private void releasecamera(){ if (mcamera != null){ mpreview.getholder().removecallback(mpreview); mcamera.release(); // release camera other applications } } @override public void onresume() { super.onresume(); // camera instance activity achieves full user focus if (mcamera == null) { getcamerainstance(); mcamera.startpreview(); } } } this camera preview class:
@suppresslint({ "viewconstructor", "sdcardpath" }) public class camerapreview extends surfaceview implements surfaceholder.callback { private static final string tag = "camerapreview"; private surfaceholder mholder; private camera mcamera; private size mpreviewsize; // private activity cameraactivity; @suppresswarnings("deprecation") public camerapreview(context context, camera camera, activity activity) { super(context); mcamera = camera; //cameraactivity = activity; // install surfaceholder.callback notified when // underlying surface created , destroyed. mholder = getholder(); mholder.addcallback(this); mholder.settype(surfaceholder.surface_type_push_buffers); } public void surfacecreated(surfaceholder holder) { // surface has been created, tell camera draw preview. try { mcamera.setpreviewdisplay(holder); //add camera preview call here. mcamera.startpreview(); } catch (ioexception e) { log.d(tag, "error setting camera preview: " + e.getmessage()); } } public void surfacedestroyed(surfaceholder holder) { // empty. take care of releasing camera preview in activity. } public void surfacechanged(surfaceholder holder, int format, int w, int h) { // if preview can change or rotate, take care of events here. // make sure stop preview before resizing or reformatting it. if (mholder.getsurface() == null){ // preview surface not exist return; } // stop preview before making changes try{ mcamera.stoppreview(); } catch (exception e){ // ignore: tried stop non-existent preview } // set preview size , make resize, rotate or // reformatting changes here camera.parameters parameters = mcamera.getparameters(); list<size> localsizes = mcamera.getparameters().getsupportedpreviewsizes(); mpreviewsize = localsizes.get(0); log.d(tag, "width " + mpreviewsize.width); log.d(tag, "height " + mpreviewsize.height); parameters.setpreviewsize(mpreviewsize.width, mpreviewsize.height ); mholder.setfixedsize(mpreviewsize.width, mpreviewsize.height); requestlayout(); mcamera.setparameters(parameters); //start preview new settings try { mcamera.setpreviewdisplay(mholder); mcamera.setdisplayorientation(90); //setcameradisplayorientation(cameraactivity, 0, mcamera); mcamera.startpreview(); } catch (exception e){ log.d(tag, "error starting camera preview: " + e.getmessage()); } } }
you create camerapreview oncreate() of activity. camera instance released onpause(), , new 1 opened onresume(). therefore, need set surface again.
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