MicrophoneRecorderView.java 文件源码

public void display(float x) {
  this.startPositionX = x;
  this.lastPositionX  = x;

  recordButtonFab.setVisibility(View.VISIBLE);

  float translation = ViewCompat.getLayoutDirection(recordButtonFab) ==
      ViewCompat.LAYOUT_DIRECTION_LTR ? -.25f : .25f;

  AnimationSet animation = new AnimationSet(true);
  animation.addAnimation(new TranslateAnimation(Animation.RELATIVE_TO_SELF, translation,
                                                Animation.RELATIVE_TO_SELF, translation,
                                                Animation.RELATIVE_TO_SELF, -.25f,
                                                Animation.RELATIVE_TO_SELF, -.25f));

  animation.addAnimation(new ScaleAnimation(.5f, 1f, .5f, 1f,
                                            Animation.RELATIVE_TO_SELF, .5f,
                                            Animation.RELATIVE_TO_SELF, .5f));

  animation.setFillBefore(true);
  animation.setFillAfter(true);
  animation.setDuration(ANIMATION_DURATION);
  animation.setInterpolator(new OvershootInterpolator());

  recordButtonFab.startAnimation(animation);
}