Skip to main content

Flutter Development (Day-13):

  • In this post we are going to talk about basic animations in Flutter
  • First we start the animation by creating two objects Animation animation, AnimationController animationController.
  • Animation lets us deal with different types of animations like Tween.
  • The tween is something in which you specify the input output range. Here begin is set to -1 and end is 0.0 which means the animation happens from out of the screen to the center of the screen. or rather, from the left most edge to the center of the app. We are also doing an ease in animation, so we specify the curve as fast out slow in.
  • In the initState we provide the animation because the animation should occur when user launches the app.

   void initState() {
     super.initState();
     animationController = AnimationController(
       vsync: this,
       duration: Duration(
        seconds: 3,
       ),
      );
     animation = Tween<double>(
       begin: -1.0,
       end: 0.0,
      ).animate(
       CurvedAnimation(
        curve: Curves.fastOutSlowIn,
        parent: animationController,
       ),
      );
         // Delayed animation
     delayedAnimation = Tween<double>(
      begin: -0.2,
      end: 0.0,
     ).animate(
      CurvedAnimation(
        parent: animationController,
        curve: Interval(
          0.6,
          1.0,
          curve: Curves.fastOutSlowIn,
        ),
      ),
     );

     animationController.repeat();
    }

  • All the animations are controlled by animationController obj.Here our app is extended with singleTickerProviderStateMixin.It is used to track every frame of the animation like clock ticks for every second.Then we provide the duration of the animation.
  • The animation here we are using is Tween.Tween is used to specify range of values means in between those range the animation should occur.
  • Delayed Animation is used to specify some delay there we provide Interval which is slightly greater than -1.0 to 0.0.You can observe it in the below video.
  • animationController.repeat() or animationController.forward() repeat() stands for it keeps on repeating the animation and forward() appears only once.


   Widget build(BuildContext context) {

    final double width = MediaQuery.of(context).size.width;
    final double height = MediaQuery.of(context).size.height;

    return AnimatedBuilder(
      animation: animationController,
      builder: (BuildContext context, Widget child) {
        return Scaffold();
});
  • Here We returned AnimatedBuilder as root widget and builder will return a child Widget

Transform(
  transform: Matrix4.translationValues(
   animation.value * width, 0.0, 0.0),
     child: Container(
      color: Colors.red,
      width: 200.0,
      height: 200.0,
        child: Center(
          child: Text(
         "BASIC ANIMATION",
          style: TextStyle(color: Colors.white),
          ),
         ),
       ),
     ),
  • Wrap the container with Transform widget which is used to transform or enables us do more interaction for the user.
  • If you want any doubts or errors please email me or  comment in the Post message.Email is provided in the profile section.
  • All source code : Click Here.
  • If you are following this tutorial / blog please leave your opinion 👀 / say Hii ✋/ Your e-mail in the comment section that I can improve myself and it will gives boost for me to do more tutorials.
  • If you have any doubts feel free to ask me in the comment section or email me ramubugudi4@gmail.com I can definetly give reply.



Follow me on:
 Twitter  Github   LinkedIn

Comments

Post a Comment

Popular posts from this blog

Flutter Development (Day-00): This is the First Post from this Blog.This blog will tell you about Flutter.If you don't know about it then the upcoming posts will explain you everything.This is 30 day tutorial which explains about Flutter for absolute beginners. prerequsites:  If you are enthusiastic and Curious. All source code :  Click Here . If you are following this tutorial / blog please leave your opinion 👀 / say Hii ✋/ Your e-mail in the comment section that I can improve myself and it will gives boost for me to do more tutorials. If you have any doubts feel free to ask me in the comment section or email me ramubugudi4@gmail.com I can definetly give reply. Follow me on:   Twitter   Github     LinkedIn
5 comments
Read more
Flutter Development (Day-16): All source code :  Click Here . Sorry for the last two days I haven't posted anything because I am ready to leave my hometown to attend my college.Is there anyone from AndhraPradesh or Tamilnadu .If yes please provide your city name in the comment section. In this post we are going to proceed the next level of our todo app.We are going add animations to our app,Code clean Up and some UI changes. We add the animation to our FloationgActionButton.You may ask why you haven't add animations to others as well? I tried it but it is looking weird. Adding animations to  FloationgActionButton is very much similar to our previous basic animation tutorial. From the next we are going to deal with some of the important widgets which we will be using in further tutorials. If you are following this tutorial / blog please leave your opinion 👀 / say Hii ✋/ Your e-mail in the comment section that I can improve myself and it will gives boost for me to
4 comments
Read more
Flutter Development (Day-11): In the last post we have discussed about how to implement brand new Todo application. All source code :  Click Here . Building its User Interface. How to display the data. How to remove the items from the List by tapping the Delete Icon or by Swiping it. Showing which item is deleted in the form of SnackBar. And finally modify some UI stuff. If you want to copy the exact same code  click here . List _todos = []; First of all create a empty list which will be holding all of our Todo's. When we tap on the ADD button we have to perfom some operation see below.   _validateForm() {if (_key.currentState.validate()) {setState(() {_todos.add(_controller.text);});_controller.clear();Navigator.of(context).pop();}} Here we have used setState () in order to refresh every single time of changing the data in the TextField and then we add the text to _todos list. Then we clear the data in the TextField and go back to homeScreen .
2 comments
Read more