java - Android: "Expression expected" when passing an Activity class -


i kind of new android programming , java in general, , cannot work out causing error; understand should work. in code shown below (near end of first snippet), line "colouroutput.do_output((activity) com.(name-removed).(app-name-removed).colouractivity);" giving error "expression expected" on text "com.(name-removed).(app-name-removed).colouractivity" in android studio 1.1.0.

(this inside class "public class colouractivity extends activity".)

        private camera.previewcallback preview_callback = new camera.previewcallback() {         @override         public void onpreviewframe(byte[] data, camera camera) {             int width = mcamera.getparameters().getpreviewsize().width;             int height = mcamera.getparameters().getpreviewsize().height;             int raw_pixels[];             int pixels[];              raw_pixels = new int[width * height];             pixels = new int[get_sample_width() * get_sample_height()];             convert_yuv(raw_pixels, data, width, height);             crop_pixels(raw_pixels, pixels, width, height, (width - get_sample_width()) / 2, (height - get_sample_height()) / 2, get_sample_width(), get_sample_height());              if (preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getboolean("use_mean", true) == true) {                 colouroutput.add_colour_to_output(                         colourtools.get_mean(                                 pixels, get_sample_width(), get_sample_height(),                                 preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getboolean("detect_secondary", true),                                 preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getboolean("detect_white", true),                                 preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getboolean("detect_brightness", true),                                 preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getint("quantization_secondary", 32),                                 preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getint("quantization_dark", 43),                                 preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getint("quantization_light", 128),                                 preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getboolean("quantization_matching_only", true)                         ),                         colouroutput.colourtype.mean);             }             if (preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getboolean("use_mode", true) == true) {                 colouroutput.add_colour_to_output(                         colourtools.get_mode(                                 pixels, get_sample_width(), get_sample_height(),                                 preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getboolean("detect_secondary", true),                                 preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getboolean("detect_white", true),                                 preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getboolean("detect_brightness", true),                                 preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getint("quantization_secondary", 32),                                 preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getint("quantization_dark", 43),                                 preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getint("quantization_light", 128),                                 preferencemanager.getdefaultsharedpreferences(getapplicationcontext()).getboolean("quantization_matching_only", true)                         ),                         colouroutput.colourtype.mode);             }             colouroutput.do_output((activity) com.(name-removed).(app-name-removed).colouractivity);         }     };

here definition of "colouroutput.do_output":

public class colouroutput {     private static boolean output_clear = true;     private static string output_buffer = "";      public static enum colourtype {         mean,         mode     }      public static void add_colour_to_output(colourtools.colourdescription colour, colourtype type) {         if (output_clear == true) {             output_buffer = colour.brightness.tostring() + " " + colour.colour.tostring();         }         else {             output_buffer = output_buffer + " " + colour.brightness.tostring() + " " + colour.colour.tostring();         }         output_clear = false;     }      public static void do_output(activity activity) {         ((textview) activity.findviewbyid(r.id.output_text)).settext(output_buffer);         output_buffer = "";         output_clear = true;     } }

the error message should self-explanatory: ...colouractivity class name , class name not valid expression in java. not android problem, simple syntax error.

do_output() expects instance of activity. i'm not quite sure, trying achieve trying pass name of activity class.

i'd assume, --since calling do_output() inside activity-- might want try 

colouroutput.do_output(coloractivity.this);

instead.

as suggested @priya singhal, explicit reference coloractivity.this necessary calling method within inner class , this refers instance of inner class.


Comments

Post a Comment

Popular posts from this blog

jquery - How do you format the date used in the popover widget title of FullCalendar? -

Image
in fullcalendar, how format date used in popover widget title when clicking '+n more'? code: <div class="fc-popover fc-more-popover"> <div class="fc-header fc-widget-header"> <span class="fc-close fc-icon fc-icon-x"></span> <span class="fc-title">tuesday, april 7</span> ... </div> ... </div> you use daypopoverformat that. determines date format of title of popover created eventlimitclick option. must date formatting string. default value "dddd, mmmm d" english , "ll" other languages.
Read more

Bubble Sort Manually a Linked List in Java -

Image
this first question here. trying manually sort linked list of integers in java , can not figure out wrong code. suggestions? don't error, still have output unordered. tried few different ways, nothing worked. appreciate if can me that. public class node { int data; node nextnode; public node(int data) { this.data = data; this.nextnode = null; } public int getdata() { return this.data; } } // node class public class datalinkedlist implements datainterface { private node head; private int size; public datalinkedlist(){ this.head = null; this.size = 0; } public void add(int data) { node node = new node(data); if (head == null) { head = node; } else { node currentnode = head; while(currentnode.nextnode != null) { currentnode = currentnode.nextnode; } currentnode.nextnode = node; ...
Read more

asp.net mvc - SSO between MVCForum and Umbraco7 -

i need integrate sso between mvcforum (forum of company) , umbraco7 (manages cms company). however struggling shared authentication work. tried several ways suggested on other threads still not running expected. here did: 1. in mvcforum (forum.mywebsite.com) 1.1. machine key in web.xml: <machinekey validationkey="the same key umbraco7" decryptionkey="the same key umbraco7" validation="sha1" decryption="aes" /> 1.2. authenticate forms in web.xml <forms name="my-sso-auth" protection="all" path="/" timeout="43200" domain="forum.mywebsite.com" loginurl="/members/logon" enablecrossappredirects="true" /> 2. in umbraco7 (news.mywebsite.com) 2.1. machine key in web.xml: <machinekey validationkey="the same key mvcforum" decryptionkey="the same key mvcforum" validation="sha1" decryption="aes" /> 2.2. a...
Read more