android - Animating 3 parts of a view -



android - Animating 3 parts of a view -

i trying create app view that, when presented subtraction problem, show animation of growing rectangle (or fat line) crawls number line integer.

i have things set click "show me!" , bars drawn along number line showing minuend, subtrahend , difference, i'd able have positive number's rectangle crawl in positive direction, negative 0 in negative direction.

in looking through documentation there seem several different ways go this. hoping can suggest way that's reasonably simple novice implement. here different approaches i've found:

this seems much person's want have bar graph bars "pop up," doesn't have answer. android animated bar chart (invalidate())

i've perused http://developer.android.com/guide/topics/resources/drawable-resource.html -- don't have "drawable" because it's beingness drawn in view. i'm thinking of making rest of number line background bitmap per android view.getdrawingcache returns null, null want 3 rectangles (for minuend, subtrahend , difference).

i have thought of making series of rectangle drawables , showing them frame-by-frame show growth.

i have looked @ animation @ specified rate using canvas / ondraw cannot discern code wrap in "if" statement, if in fact problem re-drawing...

i looked @ using paths -- , set next code together. if direction matters, seems should able slow things downwards , watch path going in direction, it's instantaneous. found saw illustration @ http://www.curious-creature.org/2013/12/21/android-recipe-4-path-tracing/

if (minuendlength > 0) // start @ 0 , go minuend length { path.addrect(interpx(0), yposition(40), interpx(minuendlength), yposition(43) , path.direction.cw); // interpx lets me number on number line should align with; //yposition percent of way downwards screen. canvas.drawpath(path,minuendpaint); // seems same drawrect -- instantaneous. }

(the number line in 'background' code follows, different options different sized integers entered:

if ( (minuendlength <10 && subtrahendlength <10 ) && (minuendlength >-10 && subtrahendlength >-10 ) ) { this.setlinedimension(10); // default super.ondraw(canvas); canvas.drawline(interpx(-this.getlinedimension()), yposition(52 ), interpx(this.getlinedimension()), yposition(52), axispaint); int step = this.getlinedimension()/5; // you're not writing *all* numbers // when come in numbers , create own number line. // paints little hatch marks (int x = -this.getlinedimension(); x <= this.getlinedimension(); x+=step/2) canvas.drawline(interpx(x), yposition(52), interpx(x), yposition(53) , littleaxispaint); // draw numbers on hatch marks textpaint.settextalign(paint.align.center); (int x = -this.getlinedimension() + step; x < this.getlinedimension(); x += step) { canvas.drawtext(integer.tostring(x), interpx(x), yposition(56), textpaint); } }

i ended doing using runnables.

animate.setonclicklistener(new view.onclicklistener() { @override public void onclick(view v) { if ( ((addend1 > 0) && (addend2 < 0)) ) { tempnum1 =addend1 ; tempnum2 = addend2; h.post(shrink1bigger); } else if (addend1 < 0 && addend2 > 0) { tempnum1 =addend1 ; tempnum2 = addend2; h.post(shrink2bigger); } } }); private runnable shrink2bigger = new runnable(){ @override public void run() { tempnum1+=1; tempnum2-=1; shrinkdraw(); log.i("watchanimactivity", "tempnum1 " + tempnum1); h.postdelayed(shrink2bigger, 500); checktemp(shrink2bigger); }}; private void shrinkdraw() { numline.setfirstnum(tempnum1); numline.setnextnum(tempnum2); numline.invalidate(); } public void checktemp(runnable shrink) { log.i("watchanimactivity", "tempnum1 in checktemp " + tempnum1); if (tempnum1 ==0 || tempnum2==0) h.removecallbacks(shrink); }

android animation view android-drawable runnable

Comments

Post a Comment

Popular posts from this blog

Delphi change the assembly code of a running process -

Delphi change the assembly code of a running process - i'm trying alter address 00741fa5 has push test.009e721c . alter push test.009e71c8 . procedure callback; asm force $9e71c8 end; procedure tform2.btn1click(sender: tobject); var ppid :dword; pprocess : cardinal; begin getwindowthreadprocessid(findwindow(nil,pchar('test')), @ppid); pprocess := openprocess(process_all_access, false, ppid); injectasm(pprocess, $741fa5, 10, integer(@callback), 0); end; here injectasm function (with error checking) function injectasm(process: longword; injectaddress, injectsize, codeaddress, codesize : integer): pointer; var csize, rsize : integer; replaced : array of byte; jmp : array [0..4] of byte; jmpaddress : integer; nopv : byte; : integer; nbr: ulong_ptr; begin //injectsize must equal or greater 5, because need space our //(far) jmp wwxxyyzz instruction //if there's no space, inject in place of few instructions if injectsize ...
Read more

json - Hibernate and Jackson (java.lang.IllegalStateException: Cannot call sendError() after the response has been committed) -

json - Hibernate and Jackson (java.lang.IllegalStateException: Cannot call sendError() after the response has been committed) - hello have problem hibernate , jackson. have 2 pojos @entity @table(name = "users") public class user implements serializable { static final long serialversionuid = 4235637833262722256l; @id @generatedvalue private int id; @column(name = "creation_date") private date creationdate; @column(name = "first_name") private string firstname; @column(name = "last_name") private string lastname; @version @column(name = "version") private int version; @column(name = "e_mail") private string email; @column(name = "enabled") private boolean enabled; @column(name = "login") private string login; @column(name = "password") private string password; @jsonmanagedreference("role") @onetomany(mappedby = "user", cascade = cascadetype.all,fetch = fetchtyp...
Read more

C++ 11 "class" keyword -

C++ 11 "class" keyword - i've started using c++ 11 little bit more , have few questions on special uses of class keyword. know it's used declare class, there's 2 instances have seen don't understand: method<class t>(); and class class_name *var; why precede typename keyword class in first example, , keyword pointer in sec example? that known elaborated type specifier , necessary when class name "shadowed" or "hidden" , need explicit. class t { }; // love of god don't t t; t t2; if compiler smart, give these warnings: main.cpp:15:5: error: must utilize 'class' tag refer type 't' in scope t t2; ^ class main.cpp:14:7: note: class 't' hidden non-type declaration of 't' here t t; ^ if class not defined, deed forwards declaration. for example: template <typename t> void method() { using type = typename t::value_type; } method...
Read more