CODEWITHSUNDEEP
javaandroidxmlanimationandroid-vectordrawable
Virginia
Virginia

Reputation: 71

How do I set a group parameter of Vector Drawable programmatically?

I have a vector drawable that I want to rotate depending on some input in my app.

I have a vector_drawable.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="100dp"
    android:height="100dp"
    android:viewportWidth="100"
    android:viewportHeight="100">

    <group
      android:name="rotation_group"
      android:pivotX="50"
      android:pivotY="50"
      android:rotation="180" >
      <path
          android:pathData="..."
          android:fillColor="#ffffff"/>
      <path
          android:pathData="..."
          android:fillColor="#ffffff"/>
    </group>

    <path
        android:pathData="..."
        android:fillColor="#242424"/>
</vector>

In my code, I create a ValueAnimator

ValueAnimator animator = ObjectAnimator.ofInt(myDrawable, "rotate", 0, 360);
animator.setDuration(500);
animator.addUpdateListener(animatorUpdateListener);
animator.start();

With animatorUpdateListener being defined as follows:

animatorUpdateListener = new AnimatorUpdateListener() {
  @Override
  public void onAnimationUpdate(ValueAnimator valueAnimator) {
    int angle = (int) valueAnimator.getAnimatedValue("rotate");
    myAngle = angle;
    myView.invalidate();
  }
};

In my onDraw method I then call

canvase.save(Canvas.MATRIX_SAVE_FLAG);
canvas.rotate(myAngle);
myDrawable.draw(canvas);
canvas.restore();

How would I be able, instead of rotating the canvas, to change the android:rotation parameter inside the rotation_group of my vector_drawable.xml?

Thanks so much!

Upvotes: 3

Views: 2033

Answers (1)

Michael Allan
Michael Allan

Reputation: 3931

You can't. There's no way to alter the XML source definition on the fly. AnimatedVectorDrawable can effectively alter the android:rotation parameter, but only to predefined values it seems, not programmatically.

An alternative solution is to rotate the Canvas when drawing it, as you currently do.

Or maybe wrap your VectorDrawable in a RotateDrawable and draw that instead.

Or setRotation on the whole view.

Upvotes: 1

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