Is there a way to make shaped buttons in Android that you create in run time?

Question

We are creating an app where you can create shaped buttons at run time to map images, something like this: http://www.outsharked.com/imagemapster/default.aspx?demos.html#vegetables We try with Android Paths but you can not make the paths disappear or change the color.

Do you have an idea?

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Botones btn = new Botones(this);

        setContentView(btn);

    }

    private class Botones extends View {

        ArrayList<Path> paths = new ArrayList<Path>();
        ArrayList<Paint> paints = new ArrayList<Paint>();

        public Botones(Context context) {
            super(context);
        }
        public Paint paintn;
        public Paint paintb;
        public Canvas canvasg;
        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);
            canvasg = canvas;
            paintn = new Paint();
            paintn.setColor(getColor(R.color.colorAccent));
            paintn.setStyle(Paint.Style.STROKE);
            paintn.setStrokeWidth(8);
            paintn.setStyle(Paint.Style.FILL);
            paints.add(paintn);

            paintb = new Paint();
            paintb.setColor(getColor(R.color.linea));
            paintb.setStyle(Paint.Style.STROKE);
            paintb.setStrokeWidth(8);
            paintb.setStyle(Paint.Style.FILL);
            paints.add(paintb);



            coordenadas(canvas);
        }

        @Override
        public boolean onTouchEvent(MotionEvent event) {

            float x;
            float y;
            x = event.getX();
            y = event.getY();

            for (Path p : paths){
                RectF pBounds=new RectF();
                p.computeBounds(pBounds,true);
                if (pBounds.contains(x,y)){
                    Log.i("path", "tocado");
                    //paints.get(0).setColor(getColor(R.color.linea));
                    canvasg.drawPath(p, paintb);
                }
            }

            return super.onTouchEvent(event);
        }

        public void coordenadas(Canvas canvas) {

            int i;
            boolean tipo = true;

            String cadena = "13, 421, 7, 587, 274, 590, 262, 467, 106, 506, 65, 444, 12, 416" +
                "|81, 13, 95, 55, 378, 70, 368, 4" +
                "|543, 88, 522, 218, 751, 228, 750, 133, 602, 111" +
                "|34, 268, 33, 383, 278, 389, 433, 356, 429, 288, 281, 312" +
                "|46, 55, 21, 131, 119, 172, 275, 158, 273, 106, 89, 79";
            String cadenaArray[] = cadena.split("\\|");

            for (String img : cadenaArray) {

                ArrayList<Float> x = new ArrayList<Float>();
                ArrayList<Float> y = new ArrayList<Float>();

                String imgArray[] = img.split("\\,");
                for (String coordena : imgArray){
                    float fin = Float.parseFloat(coordena);
                    if (tipo){
                        x.add(fin);
                    } else {
                        y.add(fin);
                    }
                    tipo = !tipo;

                }

                dibujar(x,y, canvas);
            }
        }

        public void dibujar(ArrayList<Float> coordx, ArrayList<Float> coordy, Canvas canvas){
            Path path =new Path();
            paths.add(path);
            canvas.drawColor(getColor(android.R.color.transparent));

            path.moveTo(coordx.get(0), coordy.get(0));

            for (int z = 1; z < coordx.size(); z++){
                path.lineTo(coordx.get(z),coordy.get(z));
            }
            path.lineTo(coordx.get(0),coordy.get(0));
            canvas.drawPath(path, paintn);
        }
    }
}

Community · Accepted Answer · 2017-05-23 12:23:43Z

0

I haven't practiced yet but I have found a solution. Since android studio supports javascript and css, you can do what you asked. In your given link, you can find the javascript and css file of your intended task. Then you can follow this given link where it gives all the information about adding javascript and css in Android Studio. Follow this link.

edited May 23, 2017 at 12:23

CommunityBot

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answered Feb 25, 2016 at 5:04

dawanse

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1 Comment

Hugo Fortis Over a year ago

We used to make in this way but the problem is that the buttons are created in run time and can change, will be hard to make the HTML / JS in run time to.

Bruno Carrier · Accepted Answer · 2016-02-25 05:08:30Z

0

You can use a touch delegate (it's in the Android SDK) to achieve this. You'll probably have a hard time creating your shape, but you can give it a go :)

Here's an excerpt from Vogella's tutorial (http://blog.vogella.com/2012/04/15/android-using-touchdelegates/):

/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mButton = (Button) findViewById(R.id.delegated_button);
        View parent = findViewById(R.id.root);
        parent.post(new Runnable() {
            public void run() {
                // Post in the parent's message queue to make sure the parent
                // lays out its children before we call getHitRect()
                Rect delegateArea = new Rect();
                Button delegate = mButton;
                delegate.getHitRect(delegateArea);
                delegateArea.top -= 600;
                delegateArea.bottom += 600;
                delegateArea.left -= 600;
                delegateArea.right += 600;
                TouchDelegate expandedArea = new TouchDelegate(delegateArea,
                        delegate);
                // give the delegate to an ancestor of the view we're
                // delegating the
                // area to
                if (View.class.isInstance(delegate.getParent())) {
                    ((View) delegate.getParent())
                            .setTouchDelegate(expandedArea);
                }
            };
        });
    }

Good luck!

answered Feb 25, 2016 at 5:08

Bruno Carrier

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2 Comments

Hugo Fortis Over a year ago

Weel, but the buttons have a irregular shape, as i understand this is for rectangles only

Bruno Carrier Over a year ago

Sorry, I thought you could use more shapes for that. You can use a toucher listener and then use touch's X and Y coordinates and match it against your logic for your app. It probably is a better idea than the touch delegate anyway, as long as the touch you want to interpret is within the view's bounds :)

Hugo Fortis · Accepted Answer · 2016-03-05 02:50:25Z

0

The only way that do this is making a call of invalidate() in this way the onDraw () is called and redraw the entire view using the changes that you wanted.

The canvas is not valid after the onDraw() is finished.

I hope this helps

answered Mar 5, 2016 at 2:50

Hugo Fortis

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