Question

I’m looking to replicate the following within my application:

As you can see, its basically a button which increases/decreases the value of the text view contained within it. This button will have three visual states -> unpressed, decrease and increase (as seen in the image above, the user taps the increase arrows and the button appears pressed in on that side)

Here are my 3 button states currently:

As you can see, the problem I have is being able to correctly skew/rotate the text view so it looks visually correct and appears slanted along with the button when its being increased or decreased.

I have tried two different approaches so far:

• Create a custom text view class which overrides the onDraw() method to skew the canvas:

  @Override
  public void onDraw(Canvas canvas) { 
     canvas.save(); 
  
     canvas.skew(0.2f, 0f);
  
     super.onDraw(canvas); 
     canvas.restore();
  }
  

• Integrate the Rotate3dAnimation class (source here) and used many different variations to get the desired result such as:

     Rotate3dAnimation skew = new Rotate3dAnimation(
            30, 0, centerX, centerY, 0, false);
     txtAmount.startAnimation(skew); 
  

Unfortunately, I’m not quite getting the exact result that mirrors the first image above. I’m getting confused with setting values with the Z-axis, skew, rotate etc.

I’d greatly appreciate any help from anyone who has experience with this stuff. Thanks in advance

Answer 1

Well I even tried and I came up with something like this:

 public class DemoActivity extends TextView {
    Context context;
    String firstText = "$120.00";

 public DemoActivity(Context context)
   {
    super(context);
    this.context = context;

   }


    @Override
    protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    setText(firstText);
    setTextSize(30);
    canvas.skew(1.0f, 0.3f);  //you need to change values over here
    Rotate3dAnimation skew = new Rotate3dAnimation(
              -20, 30,200, 200, 0, false);   //here too
    startAnimation(skew);

        }
    }

I got an output as:

I guess changing the values by trial and error can solve your problem.
Hope it helps.