Android?Flutter在點擊事件上添加動畫效果實現(xiàn)全過程

更新時間：2023年03月27日 09:33:08 作者：不入流Android開發(fā)

這篇文章主要給大家介紹了關于Android?Flutter在點擊事件上添加動畫效果實現(xiàn)的相關資料,通過實例代碼介紹的非常詳細,對大家學習Android具有一定的參考學習價值,需要的朋友可以參考下

實現(xiàn)效果如圖：

?實現(xiàn)思路

根據(jù)UI的設計圖，對每個模塊設計好動畫效果，需要實現(xiàn)以下四個效果。

1、底部返回鍵旋轉動畫

底部返回按鈕動畫其實就是個旋轉動畫，利用Transform.rotate設置angle的值即可，這里使用了GetX來對angle進行動態(tài)控制。

//返回鍵旋轉角度，初始旋轉45度，使其初始樣式為 +
var angle = (pi / 4).obs;
 
///關閉按鈕旋轉動畫控制器
late final AnimationController closeController;
late final Animation<double> closeAnimation;
 
///返回鍵旋轉動畫
closeController = AnimationController(
  duration: const Duration(milliseconds: 300),
  vsync: provider,
);
 
///返回鍵旋轉動畫
closeController = AnimationController(
  duration: const Duration(milliseconds: 300),
  vsync: provider,
);
 
///頁面渲染完才開始執(zhí)行，不然第一次打開不會啟動動畫
WidgetsBinding.instance.addPostFrameCallback((duration) {
  closeAnimation =
      Tween(begin: pi / 4, end: pi / 2).animate(closeController)
        ..addListener(() {
          angle.value = closeAnimation.value;
        });
  closeController.forward();
});
 
 
///關閉按鈕點擊事件
void close() {
  ///反轉動畫，并關閉頁面
  Future.delayed(
     const Duration(milliseconds: 120), () {
    Get.back();
  });
 
  closeController.reverse();
}
 
 
IconButton(
    onPressed: null,
    alignment: Alignment.center,
    icon: Transform.rotate(
      angle: controller.angle.value,
      child: SvgPicture.asset(
        "assets/user/ic-train-car-close.svg",
        width: 18,
        height: 18,
        color: Colors.black,
      ),
    ))

2、底部四個欄目變速上移動畫+漸變動畫

四個欄目其實就是個平移動畫，只不過閑魚是四個欄目一起平移，而我選擇了變速平移，這樣視覺效果上會好一點。

//透明度變化
List<AnimationController> opacityControllerList = [];
//上移動畫，由于每個欄目的移動速度不一樣，需要用List保存四個AnimationController，
//如果想像閑魚那種整體上移，則只用一個AnimationController即可。
List<AnimationController> offsetControllerList = [];
List<Animation<Offset>> offsetAnimationList = [];
 
//之所以用addIf，是因為項目中這幾個欄目的顯示是動態(tài)顯示的，這里就直接寫成true
Column(
    children: []
      ..addIf(
          true,
          buildItem('assets/user/ic-train-nomal-car.webp',"學車加練","自主預約，快速拿證"))
      ..addIf(
          true,
          buildItem('assets/user/ic-train-fuuxn-car.webp',"有證復訓","優(yōu)質陪練，輕松駕車"))
      ..addIf(
          true,
          buildItem('assets/user/ic-train-jiaxun-car.webp',"模擬加訓","考前加訓，臨考不懼"))
      ..addIf(
          true,
          buildItem('assets/user/ic-train-jiakao-car.webp',"駕考報名","快捷報名無門檻"))
      ..add(playWidget())
      ..addAll([
        17.space,
      ]),
   )
       
//僅僅是為了在offsetController全部初始化完后執(zhí)行play()
Widget playWidget() {
  //執(zhí)行動畫
  play();
  return Container();
}
 
int i = 0;
 
Widget buildItem(String img,String tab,String slogan) {
  //由于底部欄目是動態(tài)顯示的，需要在創(chuàng)建Widget時一同創(chuàng)建offsetController和offsetAnimation
  i++;
  AnimationController offsetController = AnimationController(
    duration: Duration(milliseconds: 100 + i * 20),
    vsync: this,
  );
  Animation<Offset> offsetAnimation = Tween<Offset>(
    begin: const Offset(0, 2.5),
    end: const Offset(0, 0),
  ).animate(CurvedAnimation(
    parent: offsetController,
    // curve: Curves.easeInOutSine,
    curve: const Cubic(0.12, 0.28, 0.48, 1),
  ));
 
  AnimationController opacityController = AnimationController(
      duration: const Duration(milliseconds: 500),
      lowerBound: 0.2,
      upperBound: 1.0,
      vsync: this);
 
  opacityControllerList.add(opacityController);
  offsetControllerList.add(offsetController);
  offsetAnimationList.add(offsetAnimation);
 
  return SlideTransition(
    position: offsetAnimation,
    child: FadeTransition(
        opacity: opacityController,
        child: Container(
            margin: EdgeInsets.only(bottom: 16),
            height: 62,
            decoration: BoxDecoration(
                borderRadius: BorderRadius.all(Radius.circular(12)),
                color: const Color(0xfffafafa)),
            child:
            Row(mainAxisAlignment: MainAxisAlignment.center, children: [
              24.space,
              Image.asset(img, width: 44, height: 44),
              12.space,
              Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Text(tab,
                        style: const TextStyle(
                            color: Color(0XFF000000),
                            fontSize: 16,
                            fontWeight: FontWeight.bold)),
                    Text(slogan,
                        style: const TextStyle(
                            color: Color(0XFF6e6e6e), fontSize: 12)),
                  ]).expanded,
              Image.asset("assets/user/ic-train-arrow.webp",
                  width: 44, height: 44),
              17.space
            ])).inkWell(
            onTap: () {},
            delayMilliseconds: 50)),
  );
}
 
//執(zhí)行動畫
void play() async {
  for (int i = 0; i < offsetControllerList.length; i++) {
    opacityControllerList[i].forward();
 
    ///欄目正序依次延遲(40 + 2 * i) * i的時間,曲線速率
    Future.delayed(Duration(milliseconds: (40 + 2 * i) * i), () {
      offsetControllerList[i]
          .forward()
          .whenComplete(() => offsetControllerList[i].stop());
    });
  }
}
 
///關閉按鈕點擊事件
void close() {
  ///反轉動畫，并關閉頁面
  Future.delayed(
     const Duration(milliseconds: 120), () {
    Get.back();
  });
 
  for (int i = offsetControllerList.length - 1; i >= 0; i--) {
    ///欄目倒敘依次延遲(40 + 2 * (offsetControllerList.length-1-i)) * (offsetControllerList.length-1-i))的時間
    Future.delayed(
        Duration(
            milliseconds:
            (40 + 2 * (offsetControllerList.length-1-i)) * (offsetControllerList.length-1-i)), () {
      offsetControllerList[i].reverse();
    });
  }
  opacityTopController.reverse();
}

3、中間圖片漸變動畫

漸變動畫使用FadeTransition即可。

///圖片透明度漸變動畫控制器
late final AnimationController imgController;
 
///圖片透明度漸變動畫
imgController = AnimationController(
    duration: const Duration(milliseconds: 500),
    lowerBound: 0.0,
    upperBound: 1.0,
    vsync: provider);
imgController.forward().whenComplete(() => imgController.stop());
 
///漸變過渡
FadeTransition(
  opacity: imgController,
  child:
  Image.asset("assets/user/ic-traincar-guide.webp"),
),
 
///關閉按鈕點擊事件
void close() {
  imgController.reverse();
}

4、頂部文案漸變動畫+下移動畫

///頂部標題下移動畫控制器
late final AnimationController offsetTopController;
late final Animation<Offset> offsetTopAnimation;
 
///頂部標題漸變動畫控制器
late final AnimationController opacityTopController;
 
 
///頂部標題上移動畫
offsetTopController = AnimationController(
  duration: const Duration(milliseconds: 300),
  vsync: provider,
);
offsetTopController
    .forward()
    .whenComplete(() => offsetTopController.stop());
offsetTopAnimation = Tween<Offset>(
  begin: const Offset(0, -0.8),
  end: const Offset(0, 0),
).animate(CurvedAnimation(
  parent: offsetTopController,
  curve: Curves.easeInOutCubic,
));
offsetTopController
    .forward()
    .whenComplete(() => offsetTopController.stop());
     
//UI
SlideTransition(
    position: offsetTopAnimation,
    child: FadeTransition(
        opacity: opacityTopController,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          mainAxisAlignment: MainAxisAlignment.start,
          mainAxisSize: MainAxisSize.min,
          children: [
            80.space,
            const Text(
              '練車指南',
              style: TextStyle(
                color: Color(0XFF141414),
                fontSize: 32,
                fontWeight: FontWeight.w800,
              ),
            ),
            2.space,
            const Text('易練只為您提供優(yōu)質教練，為您的安全保駕護航',
                style: TextStyle(
                    color: Color(0XFF141414),
                    fontSize: 15)),
          ],
        ))),
         
 
///關閉按鈕點擊事件
void close() {
  offsetTopController.reverse();
  opacityTopController.reverse();
 
}

5、注銷動畫

最后，在關閉頁面的時候不要忘記注銷動畫。

///關閉時注銷動畫
void dispose() {
  for (int i = offsetControllerList.length - 1; i > 0; i--) {
    offsetControllerList[i].dispose();
  }
  offsetTopController.dispose();
  opacityTopController.dispose();
  imgController.dispose();
  closeController.dispose();
}

以上就是Android Flutter實現(xiàn)仿閑魚動畫效果的詳細內(nèi)容，更多關于Android Flutter知識可以參考

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