json - Decoding a jpeg in Android -
i have json data viewing url. there many json objects in json array, 1 of jpeg image.
i send image listview in android app.
right have image json object linked private static final string tag in java file. however, realize must decode image or receive error of: unable decode stream: java.io.filenotfoundexception , resolveuri failed on bad bitmap uri.
i in long , ongoing search understand how decode json jpeg image, of such research taken place viewing posts on website please not mark duplicate question.
public class jsonbuilderactivity extends listactivity { private progressdialog pdialog; //url json private static string url = ""; //json node names private static final string tag_cars = "cars"; //root private static final string tag_carid = "carid"; private static final string tag_carvin = "carvin"; private static final string tag_img= "carmainimage"; jsonarray carid = null; //initializes json array static string response = null; //hashmap listview arraylist<hashmap<string, object>>caridlist; @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); listview lv = getlistview(); //listview on item click listener lv.setonitemclicklistener(new onitemclicklistener() { @override public void onitemclick(adapterview<?> parent, view view, int position, long id) { //gets values selected listitem string cars = ((textview) view.findviewbyid(r.id.cars)).gettext().tostring(); string car_id = ((textview) view.findviewbyid(r.id.car_id)).gettext().tostring(); string car_vin = ((textview) view.findviewbyid(r.id.car_vin)).gettext().tostring(); string model_img = ((imageview) view.findviewbyid(r.id.model_img)).gettag().tostring(); intent in = new intent(jsonbuilderactivity.this, mainactivity.class); //sends data mainactivity in.putextra("tag_cars", cars); in.putextra("tag_carid", car_id); in.putextra("tag_carvin", car_vin); in.putextra("tag_img", model_img); startactivity(in); } }); //calls async task json new getcars().execute(); } public class servicehandler { public final static int = 1; public final static int post = 2; public servicehandler() { } /** * makes service call * @url - url make request * @method - http request method * */ public string makeservicecall(string url, int method) { return this.makeservicecall(url, method, null); } /** * makes service call * @url - url make request * @method - http request method * @params - http request params * */ public string makeservicecall(string url, int method,arraylist<namevaluepair> params) { try { defaulthttpclient httpclient = new defaulthttpclient(); httpentity httpentity = null; httpresponse httpresponse = null; //checks http request method type if (method == post) { httppost httppost = new httppost(url); //adds post params if (params != null) { httppost.setentity(new urlencodedformentity(params)); } httpresponse = httpclient.execute(httppost); } else if (method == get) { //appends params url if (params != null) { string paramstring = urlencodedutils.format(params, "utf-8"); url += "?" + paramstring; } httpget httpget = new httpget(url); httpresponse = httpclient.execute(httpget); } httpentity = httpresponse.getentity(); response = entityutils.tostring(httpentity); } catch (unsupportedencodingexception e) { e.printstacktrace(); } catch (clientprotocolexception e) { e.printstacktrace(); } catch (ioexception e) { e.printstacktrace(); } return response; } } /* * async task class json making http call */ private class getcars extends asynctask<void, void, void> { @override protected void onpreexecute() { super.onpreexecute(); caridlist = new arraylist<hashmap<string, object>>(); //shows progress dialog pdialog = new progressdialog(jsonbuilderactivity.this); pdialog.setmessage("please wait..."); pdialog.setcancelable(false); pdialog.show(); } @override protected void doinbackground(void... arg0) { //creates service handler class instance servicehandler sh = new servicehandler(); //makes request url , getting response string jsonstr = sh.makeservicecall(url, servicehandler.get); //prints json response in log log.d("getcars response: ", "> " + jsonstr); if (jsonstr != null) { try { log.d("try", "in try"); jsonobject jsonobj = new jsonobject(jsonstr); log.d("jsonobject", "new json object"); //gets json array node carid = jsonobj.getjsonarray(tag_cars); log.d("json array", "user point array"); int len = carid.length(); log.d("len", "get array length"); (int = 0; < carid.length(); i++) { jsonobject c = carid.getjsonobject(i); string car_id = c.getstring(tag_carid); log.d("car_id", car_id); string car_vin = c.getstring(tag_carvin); log.d("car_vin", car_vin); bitmapfactory.options options = new bitmapfactory.options(); options.injustdecodebounds = true; bitmapfactory.decoderesource(getresources(), r.id.model_img, options); int imageheight = options.outheight; int imagewidth = options.outwidth; string imagetype = options.outmimetype; // byte[] bytearray = base64.decode(jsonobj.getstring(tag_img), base64.default) ; //bitmap bmp1 = bitmapfactory.decodebytearray(bytearray, 0, bytearray.length); //string model_img = c.getstring(tag_img); //log.d("model_img", model_img); //hashmap single match hashmap<string, object> matchgetcars = new hashmap<string, object>(); //adds each child node hashmap key => value matchgetcars.put(tag_carid, car_id); matchgetcars.put(tag_carvin, car_vin); matchgetcars.put(tag_img, ); //idk caridlist.add(matchgetcars); } } catch (jsonexception e) { e.printstacktrace(); } } else { log.e("servicehandler", "couldn't data url"); } return null; } @override protected void onpostexecute(void result) { super.onpostexecute(result); //dismisses progress dialog if (pdialog.isshowing()) pdialog.dismiss(); /** * updates parsed json data listview * */ listadapter adapter = new simpleadapter(jsonbuilderactivity.this, caridlist, r.layout.list_item, new string[]{tag_carid, tag_carvin, tag_img}, new int[]{r.id.car_id, r.id.car_vin, r.id.model_img}); setlistadapter(adapter); log.v("list parsed", caridlist.tostring()); } } so suggestions of how decode json jpeg image appreciated. thank you.
} update:
public uri getimageuri(context incontext, bitmap inimage){ bytearrayoutputstream bytes = new bytearrayoutputstream(); inimage.compress(bitmap.compressformat.jpeg, 100, bytes); string path = mediastore.images.media.insertimage(incontext.getcontentresolver(), inimage, "carmainimage", null); return uri.parse(path); } public void savebmptofile(file filename, bitmap bmp){ fileoutputstream out = null; try { out = new fileoutputstream(filename); bmp.compress(bitmap.compressformat.png, 100, out); // bmp bitmap instance // png lossless format, compression factor (100) ignored } catch (exception e) { e.printstacktrace(); } { try { if (out != null) { out.close(); } } catch (ioexception e) { e.printstacktrace(); } } } //------------------------ public boolean renamefileextension(string source, string newextension) { string target; string currentextension = getfileextension(source); if (currentextension.equals("")) { target = source + "." + newextension; } else { target = source.replacefirst(pattern.quote("." + currentextension) + "$", matcher.quotereplacement("." + newextension)); } return new file(source).renameto(new file(target)); } //--------------------------------------------------- public string getfileextension(string f) { string ext = ""; int = f.lastindexof('.'); if (i > 0 && < f.length() - 1) { ext = f.substring(i + 1); } return ext; } /* * async task class json making http call */ private class getcars extends asynctask<void, void, void> { @override protected void onpreexecute() { super.onpreexecute(); caridlist = new arraylist<hashmap<string, object>>(); //shows progress dialog pdialog = new progressdialog(jsonbuilderactivity.this); pdialog.setmessage("please wait..."); pdialog.setcancelable(false); pdialog.show(); } @override protected void doinbackground(void... arg0) { //creates service handler class instance servicehandler sh = new servicehandler(); //makes request url , getting response string jsonstr = sh.makeservicecall(url, servicehandler.get); //prints json response in log log.d("getcars response: ", "> " + jsonstr); if (jsonstr != null) { try { log.d("try", "in try"); jsonobject jsonobj = new jsonobject(jsonstr); log.d("jsonobject", "new json object"); //gets json array node carid = jsonobj.getjsonarray(tag_cars); log.d("json array", "user point array"); int len = carid.length(); log.d("len", "get array length"); (int = 0; < carid.length(); i++) { jsonobject c = carid.getjsonobject(i); string car_id = c.getstring(tag_carid); log.d("car_id", car_id); string car_vin = c.getstring(tag_carvin); log.d("car_vin", car_vin); string model_img=c.getstring(tag_img); // byte[] bytearray = base64.decode(jsonobj.getstring(tag_img), base64.default) ; //bitmap bmp1 = bitmapfactory.decodebytearray(bytearray, 0, bytearray.length); // string model_img = c.getstring(tag_img); //log.d("model_img", model_img); //hashmap single match hashmap<string, object> matchgetcars = new hashmap<string, object>(); //adds each child node hashmap key => value matchgetcars.put(tag_carid, car_id); matchgetcars.put(tag_carvin, car_vin); matchgetcars.put(tag_img, model_img); caridlist.add(matchgetcars); } } catch (jsonexception e) { e.printstacktrace(); } } else { log.e("servicehandler", "couldn't data url"); } return null; } @override protected void onpostexecute(void result) { super.onpostexecute(result); //dismisses progress dialog if (pdialog.isshowing()) pdialog.dismiss(); /** * updates parsed json data listview * */ listadapter adapter = new simpleadapter(jsonbuilderactivity.this, caridlist, r.layout.list_item, new string[]{tag_carid, tag_carvin, tag_img}, new int[]{r.id.car_id, r.id.car_vin, r.id.model_img}); setlistadapter(adapter); log.v("list parsed", caridlist.tostring()); } } logcat:
v/list parsed﹕ [{carmainimage=/images/image.php?w=200&i unable decode stream: java.io.filenotfoundexception: /images/image.php?w=200.... unable resolveuri failed on bad bitmap uri: /images/image.php?w=200.... i not understand why parsed list correctly logged , error pop up. however, json jpeg in url not formatted jpeg in log cat because jpeg in json looks like: /images/image.php?w=200... , jpeg in logcat looks like: /images/image.php?200.. difference ..can elaborate if why error messages shown and/or offer suggestions fix errors? willing research , go , forth understand suggest. thanks.
without thinking post conversion code: **this place holder.** required understanding: bitmap uri provides object representation of "uniform resource identifier" url (universal resourse loacator) reference (an address) resource on internet. file extensions. *.png *.jpg up-dated when brain not without sleep ;o) more come think , brain hurts: //------------------------ public uri getimageuri(context incontext, bitmap inimage) { bytearrayoutputstream bytes = new bytearrayoutputstream(); inimage.compress(bitmap.compressformat.jpeg, 100, bytes); string path = images.media.insertimage(incontext.getcontentresolver(), inimage, "title", null); return uri.parse(path); } public void savebmptofile(file filename, bitmap bmp) { fileoutputstream out = null; try { out = new fileoutputstream(filename); bmp.compress(bitmap.compressformat.png, 100, out); // bmp bitmap instance // png lossless format, compression factor (100) ignored } catch (exception e) { e.printstacktrace(); } { try { if (out != null) { out.close(); } } catch (ioexception e) { e.printstacktrace(); } } } //------------------------ public static boolean renamefileextension(string source, string newextension) { string target; string currentextension = getfileextension(source); if (currentextension.equals("")) { target = source + "." + newextension; } else { target = source.replacefirst(pattern.quote("." + currentextension) + "$", matcher.quotereplacement("." + newextension)); } return new file(source).renameto(new file(target)); } //--------------------------------------------------- public static string getfileextension(string f) { string ext = ""; int = f.lastindexof('.'); if (i > 0 && < f.length() - 1) { ext = f.substring(i + 1); } return ext; } //----------------------- 
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