I have an Activity
with a FloatingActionButton
. When I press the FAB, an AlertDialog
is shown. I want to animate its appearance by using something like reveal effect or curved motion from Android
's Material Design
. The documentation only has an example for changing visibility of existing views.
How can I achieve that for an AlertDialog
?
If you have a custom view (defined in a XML) you can try this:
AlertDialog a = new AlertDialog.Builder(this)...blablabla;
View v = a.findViewById(R.layout.example);
// get the center for the clipping circle
int cx = (v.getLeft() + v.getRight()) / 2;
int cy = (v.getTop() + v.getBottom()) / 2;
// get the final radius for the clipping circle
int finalRadius = Math.max(v.getWidth(), v.getHeight());
// create the animator for this view (the start radius is zero)
Animator anim = ViewAnimationUtils.createCircularReveal(v, cx, cy, 0, finalRadius);
// make the view visible and start the animation
v.setVisibility(View.VISIBLE);
anim.start();
To hide it using the reverse animation:
View v = <yourAlertDialog>.findViewById(R.layout.example);
// get the center for the clipping circle
int cx = (v.getLeft() + v.getRight()) / 2;
int cy = (v.getTop() + v.getBottom()) / 2;
// get the initial radius for the clipping circle
int initialRadius = v.getWidth();
// create the animation (the final radius is zero)
Animator anim = ViewAnimationUtils.createCircularReveal(v, cx, cy, initialRadius, 0);
// make the view invisible when the animation is done
anim.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
v.setVisibility(View.INVISIBLE);
}
});
// start the animation
anim.start();
I did something similar by calling the dialog's setOnShowListener
before I show the dialog. I still need to refine the animation, but it is a start:
dialogToAnimate.setOnShowListener(new OnShowListener() {
@Override public void onShow(DialogInterface dialog) {
// Remember that ViewAnimationUtils will not work until API 21.
final View view = dialogToAnimate.getWindow().getDecorView();
final int centerX = view.getWidth() / 2;
final int centerY = view.getHeight() / 2;
// TODO Get startRadius from FAB
// TODO Also translate animate FAB to center of screen?
float startRadius = 20;
float endRadius = view.getHeight();
Animator animator = ViewAnimationUtils.createCircularReveal(view, centerX, centerY, startRadius, endRadius);
animator.setDuration(1000);
animator.start();
}
});
Alert Dialog With Reveal Effect for above API 21=>
public final void customAlertDialog(final Activity mActivity)
{
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(mActivity);
final View view = LayoutInflater.from(mActivity).inflate(R.layout.alert_dialog_simple_msg,null);
alertDialogBuilder.setView(view);
final AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
TextView tvOk= (TextView) view.findViewById(R.id.tvOk);
final Animator[] animHide = {null};
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
alertDialog.show();
view.post(new Runnable() {
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public void run() {
int cx = (int)view.getWidth() / 2;
int cy = (int) view.getHeight() / 2;
float finalRadius = (float) Math.hypot(cx, cy);
Animator animVisible = ViewAnimationUtils.createCircularReveal(view, cx, cy, 0, finalRadius);
animHide[0] = ViewAnimationUtils.createCircularReveal(view, cx, cy, finalRadius, 0);
animVisible.start();
}
});
}
tvOk.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
if ( animHide[0]!=null)
{
animHide[0].addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
alertDialog.dismiss();
}
});
animHide[0].start();
}
else
{
alertDialog.dismiss();
}
}
else
{
alertDialog.dismiss();
}
}
});
alertDialog.setCancelable(false);
}
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