[external chain picture transfer failed. The source station may have anti-theft chain mechanism. It is recommended to save the picture and upload it directly (img-xxv5rz2b-1631251709878)( https://user-gold-cdn.xitu.io/2019/1/8/1682c515f06f92b1?imageslim )]
thinking
This interface is actually relatively simple to implement, which can be roughly divided into the following parts:
- 1. Gaussian Blur effect of background
- 2. Rotating animation of black glue cartridge
- 3. Rotating animation of vinyl record
- 4. Lower controller and progress bar
Let's talk about the implementation process one by one.
practice
The whole interface is a stacked view. At the bottom is a background picture, which is covered with a Gaussian fuzzy translucent mask, and then the upper layer is the title, vinyl player and controller.
1. Background Gaussian blur
Firstly, the stack component is used to wrap the stacked view. There are two container s in it. The first is a background network picture and the second is a BackdropFilter.
Stack(
children: <Widget>[
new Container(
decoration: new BoxDecoration(
image: new DecorationImage(
image: new NetworkImage(coverArt),
fit: BoxFit.cover,
colorFilter: new ColorFilter.mode(
Colors.black54,
BlendMode.overlay,
),
),
),
),
new Container(
child: new BackdropFilter(
filter: ImageFilter.blur(sigmaX: 10.0, sigmaY: 10.0),
child: Opacity(
opacity: 0.6,
child: new Container(
decoration: new BoxDecoration(
color: Colors.grey.shade900,
),
),
),
)),
...
]
Here, the values of Gaussian blur sigma X and sigma y are 10, then the transparency is 0.6 and the color is grey.shade900.
2. Rotating animation of black glue cartridge
The knowledge of animation will not be introduced in detail here. You can refer to the official document [portal](
)
The custom animation components are in the need_anim.dart file. Here, the animation and components are decoupled, and the animation process class PivotTransition is defined respectively. As the name suggests, it rotates around a fulcrum and inherits from the AnimatedWidget.
The fulcrum is set at the topcenter of the child component. Note that turns cannot be empty. You need to calculate the circumference of the rotation bypass according to the value of turns and rotate around the Z axis.
class PivotTransition extends AnimatedWidget {
///Create rotation transform
///turns cannot be empty
PivotTransition({
Key key,
this.alignment: FractionalOffset.topCenter,
@required Animation<double> turns,
this.child,
}) : super(key: key, listenable: turns);
/// The animation that controls the rotation of the child.
/// If the current value of the turns animation is v, the child will be
/// rotated v * 2 * pi radians before being painted.
Animation<double> get turns => listenable;
/// The pivot point to rotate around.
final FractionalOffset alignment;
/// The widget below this widget in the tree.
final Widget child;
@override
Widget build(BuildContext context) {
final double turnsValue = turns.value;
final Matrix4 transform = new Matrix4.rotationZ(turnsValue * pi * 2.0);
return new Transform(
transform: transform,
alignment: alignment,
child: child,
);
}
}
The next step is to customize the black glue cartridge assembly.
final _rotateTween = new Tween<double>(begin: -0.15, end: 0.0);
new Container(
child: new PivotTransition(
turns: _rotateTween.animate(controller_needle),
alignment: FractionalOffset.topLeft,
child: new Container(
width: 100.0,
child: new Image.asset("images/play_needle.png"),
),
),
),
Wrap the png picture in the container and pass it to PivotTransition as a child parameter.
When used externally, a Tween is passed in, starting at -0.15 ~ 0.0.
3. Rotating animation of vinyl record
This part of the code is in the record_anim.dart file. The RotationTransition provided by package: Shuttle / animation.dart is used for rotation, which is very simple.
class RotateRecord extends AnimatedWidget {
RotateRecord({Key key, Animation<double> animation})
: super(key: key, listenable: animation);
Widget build(BuildContext context) {
# summary
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F-1631251709883)]
> **This article has been[tencent CODING Open source hosting project:< Android Summary of study notes+Mobile architecture video+Real interview questions for large factories+Project practice source code](https://ali1024.coding.net/public/P7/Android/git), self-study resources and series of articles are constantly updated**