android - using custom view "SignatureView" to capture user signature -


im trying have signatureview capture user's signature after fill form, codes not making draw. found drawing codes on youtube , tried them not draw anything, although scroll lock working. following code

the xml signatureview

<signatureview             android:background="#ffffff"             android:layout_width="match_parent"             android:layout_height="400dp"             android:id="@+id/signatureview"/>

the code signatureview enable drawing

public class signatureview extends view {  public static int brush_size = 5; public static final int default_color = color.black; public static final int defaul_bg_color = color.white; private static final float touch_tolerance = 4; private float mx, my; private path mpath; private paint mpaint; private arraylist<fingerpath> paths = new arraylist<>(); private int currentcolor; private int backgroundcolor = defaul_bg_color; private int strokewidth; private bitmap mbitmap; private canvas mcanvas; private paint mbitmappaint = new paint(paint.dither_flag); public signatureview(context context){     this(context, null); }  public signatureview(context context, attributeset attrs){     super(context, attrs);     mpaint = new paint();     mpaint.setantialias(true);     mpaint.setdither(true);     mpaint.setcolor(default_color);     mpaint.setstyle(paint.style.stroke);     mpaint.setstrokejoin(paint.join.round);     mpaint.setstrokecap(paint.cap.round);     mpaint.setxfermode(null);     mpaint.setalpha(0xff); }  public void init(displaymetrics metrics){     int height = metrics.heightpixels;     int width = metrics.widthpixels;      mbitmap = bitmap.createbitmap(width, height, bitmap.config.argb_8888);     mcanvas = new canvas(mbitmap);      currentcolor = default_color;     strokewidth = brush_size; }  protected void ondraw(canvas canvas){     canvas.save();     mcanvas.drawcolor(backgroundcolor);     (fingerpath fp : paths){         mpaint.setcolor(fp.color);         mpaint.setstrokewidth(fp.strokewidth);     }      canvas.drawbitmap(mbitmap, 0, 0, mbitmappaint);     canvas.restore(); }  private void touchstart(float x, float y){     mpath = new path();     fingerpath fp = new fingerpath(currentcolor, strokewidth, mpath);     paths.add(fp);     mpath.reset();     mpath.moveto(x, y);     mx = x;     = y; }  private void touchmove(float x, float y){     float dx = math.abs(x - mx);     float dy = math.abs(y - my);      if (dx >= touch_tolerance || dy >= touch_tolerance){         mpath.quadto(mx, my, (x + mx) / 2, (y + my) /2);         mx = x;         = y;     } }  private void touchup(){     mpath.lineto(mx, my); }  @override public boolean ontouchevent(motionevent event) {     float x = event.getx();     float y = event.gety();     getparent().requestdisallowintercepttouchevent(true);      switch(event.getaction()){         case motionevent.action_down :             touchstart(x, y);             invalidate();             break;         case motionevent.action_move :             touchmove(x, y);             invalidate();             break;         case motionevent.action_up :             touchup();             invalidate();             break;     }     return true; }

the fingerpath class

public class fingerpath { public int color; public int strokewidth; public path path;  public fingerpath(int color, int strokewidth, path path){     this.color = color;     this.strokewidth = strokewidth;     this.path = path; } }

the java class page

public class application_applicant extends appcompatactivity { private signatureview sv;  protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_app_applicant);     sv = (signatureview)findviewbyid(r.id.signatureview);     displaymetrics metrics = new displaymetrics();     getwindowmanager().getdefaultdisplay().getmetrics(metrics);     sv.init(metrics); } }

please have myview class in apis demo of android link: https://android.googlesource.com/platform/development/+/master/samples/apidemos/src/com/example/android/apis/graphics/fingerpaint.java

you can find demos in project. it's useful


Comments

Post a Comment

Popular posts from this blog

angular - Ionic slides - dynamically add slides before and after -

hi i'm using ngfor create set of 3 slides while starting in middle i'm guaranteed able slide left or right on start. when slide right can simple listen reachedend , push slide array i'm looping. but have problem adding slide beginning. if same above , use e.g. array.unshift() or spread add item beginning, view think it's on position 0 , snaps view new slide. the code below work animates slide change index 1. slide = [0,1,2] //example loop slidechanged(event) { if(this.slides.isbeginning()){ this.slide = [this.slide[0]-1, ...this.slide]; this.slides.update(); this.slides.slideto(1) } } <ion-slides [initialslide]="1" (ionslidedidchange)="slidechanged($event)"> <ion-slide *ngfor="let item of slide"> <h1>slide {{item}}</h1> </ion-slide> </ion-slides> any appreciated! you can using ionslidenextend , ionslideprevend events slides . please...
Read more

Add a dynamic header in angular 2 http provider -

i have http interceptor built via tutorial https://scotch.io/@kashyapmukkamala/using-http-interceptor-with-angular2 the problem need have dynamic header changes automatically once changes 'mode' in app. service able tell interceptor change header, or have interceptor pull header (which string)from service each request. able throwing away patch method, call http.patch('new header string') set header string. call in service controls 'mode' setting. wondering if there way interceptor pull recent value service each request or if can add method http provider via interceptor? i've tried call service in interceptor each request returns undefined. because creating new instance of service or copying value before service fired , loaded/changed data. i don't want pass header string every http provider call because defeats purpose of having interceptor, id able set once changes or have provider fetch service before makes request. tl;dr : need add autom...
Read more

minify - Minimizing css files -

i want know how css files can minimized. currently, using external sites css minifier compress css files. however, after removing whitespaces, comments, etc, file sizes reduced 10-15%. how frameworks bootstrap manage make minimized versions kilobytes. as example, css is: body { background-color: #ff0; } the reduction goes 28 bytes 22 bytes other css files have lot more characters still smaller this. actually minifying code means it's remove thing code white space characters new line characters comments block delimiters it reduces amount of code has transferred on web , speed site load fastly.but unreadable format.
Read more