Flutter-检测内存泄漏
我有点困惑，因为我一直在思考，因为没有weak的概念（如果我是对的），就不会出现内存泄漏。
我正在iOS设备上运行它。
我正在尝试播放视频并预先初始化一些视频，以便用户可以立即看到它。
为此，我准备了六个VideoPlayerController，并使它们始终在当前视频播放时被初始化。
当前的一个旁边还有另外三个初始化的VideoPlayerController，而当前的一个之前还有另外两个初始化的Future, async, await，如下图所示。
按照这种逻辑，我可以非常流畅地来回播放视频。但是播放了大约十个视频后，由于内存问题，应用程序崩溃了。
我尝试了所有功能NotificationListener，但仍然有很多记忆。
我不确定，但是可能是onNotification？
由于bool返回Future而不是main thread或
这和 class _SwiperScreenState extends State<SwiperScreen> {
VideoPlayerController _firstController;
VideoPlayerController _secondController;
VideoPlayerController _thirdController;
VideoPlayerController _fourthController;
VideoPlayerController _fifthController;
VideoPlayerController _sixthController;
List<VideoPlayerController> _controllers;
List<String> urls = [
'https://firebasestorage.googleapis.com/v0/b/waitingboy-34497.appspot.com/o/video%2F8-21%2F1534825377992OsfJfKsdf90K8sf?alt=media&token=12245ee4-1598-4f7e-ba28-a9eb72ca474e',
'http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_20mb.mp4',
'https://firebasestorage.googleapis.com/v0/b/waitingboy-34497.appspot.com/o/video%2F8-21%2F1534825377992OsfJfKsdf90K8sf?alt=media&token=12245ee4-1598-4f7e-ba28-a9eb72ca474e',
'http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_20mb.mp4',
];
int currentIndex = 0; //refer to current playing controller index
int videosIndex = 0; //refer to current playing urls index
bool _didGetNotification(ScrollNotification notification) {
if (notification is UserScrollNotification) {
if (notification.direction.toString() == 'ScrollDirection.reverse') {
//swipe to left so add one more video
videosIndex++;
//modify index so that always in the range of 0 ~ 5.
if (currentIndex <= 2) {
final int prepareIndex = currentIndex + 3;
urls.add(
'https://firebasestorage.googleapis.com/v0/b/waitingboy-34497.appspot.com/o/video%2F8-21%2F1534825377992OsfJfKsdf90K8sf?alt=media&token=12245ee4-1598-4f7e-ba28-a9eb72ca474e');
_initVideo(urls[videosIndex], prepareIndex);
} else {
final int prepareIndex = (currentIndex + 3) - 6;
urls.add(
'http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_20mb.mp4');
_initVideo(urls[videosIndex], prepareIndex);
}
}
if (notification.direction.toString() == 'ScrollDirection.forward') {
//swipe to right so back one more video
videosIndex--;
//modify index so that always in the range of 0 ~ 5 .
if (currentIndex >= 2) {
final int videoIndex = videosIndex - 2;
final int prepareIndex = currentIndex - 2;
_initVideo(urls[videoIndex], prepareIndex);
} else {
final int videoIndex = videosIndex - 2;
final int prepareIndex = 4 + currentIndex;
_initVideo(urls[videoIndex], prepareIndex);
}
}
}
return true;
}
Future _initVideo(String url, int initIndex) async {
if (_controllers[initIndex] != null) {
await _controllers[initIndex].dispose();
}
_controllers[initIndex] = new VideoPlayerController.network(url);
await _controllers[initIndex].initialize().then((_) async => await _controllers[initIndex].setLooping(true));
setState(() {});
}
Future _initFirstThree() async {
for (int i = 1; i < urls.length; i++) {
await _initVideo(urls[i], i);
}
}
@override
void initState() {
_controllers = [
_firstController,
_secondController,
_thirdController,
_fourthController,
_fifthController,
_sixthController
];
_initVideo(urls[0], 0).then((_) => _controllers[0].play());
_initFirstThree();
super.initState();
}
@override
void deactivate() {
_controllers[currentIndex].setVolume(0.0);
_controllers[currentIndex].pause();
super.deactivate();
}
@override
void dispose() {
_controllers.forEach((con) {
con.dispose();
});
super.dispose();
}
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Swiper'),
actions: <Widget>[
new IconButton(
icon: new Icon(Icons.disc_full),
onPressed: () {
Navigator
.of(context)
.push(MaterialPageRoute(builder: (context) => Dissmiss()));
},
)
],
),
body: new NotificationListener(
onNotification: _didGetNotification,
child: new Swiper(
itemCount: 6,
itemBuilder: (BuildContext context, int index) {
return _controllers[index].value.initialized
? new AspectRatio(
aspectRatio: _controllers[index].value.aspectRatio,
child: new VideoPlayer(_controllers[index]),
)
: new Center(child: new CircularProgressIndicator());
},
loop: urls.length > 6 ? true : false,
onIndexChanged: (i) async {
currentIndex = i;
final int pauseIndex = i == 0 ? 5 : i - 1;
await _controllers[pauseIndex].pause().then((_) async {
await _controllers[i].play();
});
},
),
),
);
}
}
有关系吗？
有人知道如何解决此内存问题吗？
代码：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/appbackground"
android:orientation="vertical"
android:weightSum="10">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2">
<TextView
android:id="@+id/textgird"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="WAJunk Cleaner"
android:textColor="#fff"
android:textSize="34sp" />
</RelativeLayout>
<GridLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="8"
android:alignmentMode="alignMargins"
android:baselineAligned="false"
android:columnCount="2"
android:columnOrderPreserved="false"
android:padding="14dp"
android:rowCount="4">
<!-- ROW1 -->
<android.support.v7.widget.CardView
android:id="@+id/android_image"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_columnWeight="1"
android:layout_marginBottom="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_rowWeight="1"
card_view:cardCornerRadius="8dp"
card_view:cardElevation="8dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical"
android:layout_margin="10dp"
android:orientation="vertical"
android:paddingBottom="10dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:src="@drawable/photoicon" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical|bottom"
android:orientation="vertical">
<TextView
android:id="@+id/whatsapp_images_sub_title_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAlignment="center"
android:textColor="#000"
android:textSize="10sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
<!--ROW2 -->
<android.support.v7.widget.CardView
android:id="@+id/whatsapp_video"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_columnWeight="1"
android:layout_marginBottom="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_rowWeight="1"
card_view:cardCornerRadius="8dp"
card_view:cardElevation="8dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical"
android:layout_margin="10dp"
android:orientation="vertical"
android:paddingBottom="10dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:src="@drawable/videoicon" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical|bottom"
android:orientation="vertical">
<TextView
android:id="@+id/whatsapp_video_sub_title_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAlignment="center"
android:textColor="#000"
android:textSize="12sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
<!-- ROW3 -->
<android.support.v7.widget.CardView
android:id="@+id/whatsapp_databases"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_columnWeight="1"
android:layout_marginBottom="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_rowWeight="1"
card_view:cardCornerRadius="8dp"
card_view:cardElevation="8dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical"
android:layout_margin="10dp"
android:orientation="vertical"
android:paddingBottom="10dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:src="@drawable/database" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical|bottom"
android:orientation="vertical">
<TextView
android:id="@+id/whatsapp_databases_sub_title_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAlignment="center"
android:textColor="#000"
android:textSize="12sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
<!--ROW4 -->
<android.support.v7.widget.CardView
android:id="@+id/android_profile"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_columnWeight="1"
android:layout_marginBottom="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_rowWeight="1"
card_view:cardCornerRadius="8dp"
card_view:cardElevation="8dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical"
android:layout_margin="10dp"
android:orientation="vertical"
android:paddingBottom="10dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:src="@drawable/profilepic" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical|bottom"
android:orientation="vertical">
<TextView
android:id="@+id/whatsapp_dp_sub_title_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAlignment="center"
android:textColor="#000"
android:textSize="12sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
<!-- ROW5 -->
<android.support.v7.widget.CardView
android:id="@+id/whatsapp_wallpaper"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_columnWeight="1"
android:layout_marginBottom="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_rowWeight="1"
card_view:cardCornerRadius="8dp"
card_view:cardElevation="8dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical"
android:layout_margin="10dp"
android:orientation="vertical"
android:paddingBottom="10dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:src="@drawable/wallpapericon" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical|bottom"
android:orientation="vertical">
<TextView
android:id="@+id/whatsapp_wallpaper_sub_title_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAlignment="center"
android:textColor="#000"
android:textSize="12sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
<!--ROW6 -->
<android.support.v7.widget.CardView
android:id="@+id/whatsapp_voice_notes"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_columnWeight="1"
android:layout_marginBottom="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_rowWeight="1"
card_view:cardCornerRadius="8dp"
card_view:cardElevation="8dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical"
android:layout_margin="10dp"
android:orientation="vertical"
android:paddingBottom="10dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:src="@drawable/voicenote" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical|bottom"
android:orientation="vertical">
<TextView
android:id="@+id/whatsapp_voice_sub_title_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAlignment="center"
android:textColor="#000"
android:textSize="11sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
<!-- ROW7 Documents-->
<android.support.v7.widget.CardView
android:id="@+id/android_documents"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_columnWeight="1"
android:layout_marginBottom="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_rowWeight="1"
card_view:cardCornerRadius="8dp"
card_view:cardElevation="8dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical"
android:layout_margin="10dp"
android:orientation="vertical"
android:paddingBottom="10dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:src="@drawable/documents" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical|bottom"
android:orientation="vertical">
<TextView
android:id="@+id/whatsapp_documents_sub_title_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAlignment="center"
android:textColor="#000"
android:textSize="12sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
<!--ROW8 DataBase -->
<android.support.v7.widget.CardView
android:id="@+id/whatsapp_audio"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_columnWeight="1"
android:layout_marginBottom="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_rowWeight="1"
card_view:cardCornerRadius="8dp"
card_view:cardElevation="8dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical"
android:layout_margin="10dp"
android:orientation="vertical"
android:paddingBottom="10dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:src="@drawable/musicicon" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical|bottom"
android:orientation="vertical">
<TextView
android:id="@+id/whatsapp_audio_sub_title_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAlignment="center"
android:textColor="#000"
android:textSize="12sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
</GridLayout>
<com.google.android.gms.ads.AdView
android:id="@+id/adView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerInParent="true"
ads:adSize="SMART_BANNER"
ads:adUnitId="@string/banner_home_footer">
</com.google.android.gms.ads.AdView>
</LinearLayout>
0 个答案:
- 我写了这段代码，但我无法理解我的错误
- 我无法从一个代码实例的列表中删除 None 值，但我可以在另一个实例中。为什么它适用于一个细分市场而不适用于另一个细分市场？
- 是否有可能使 loadstring 不可能等于打印？卢阿
- java中的random.expovariate()
- Appscript 通过会议在 Google 日历中发送电子邮件和创建活动
- 为什么我的 Onclick 箭头功能在 React 中不起作用？
- 在此代码中是否有使用“this”的替代方法？
- 在 SQL Server 和 PostgreSQL 上查询，我如何从第一个表获得第二个表的可视化
- 每千个数字得到
- 更新了城市边界 KML 文件的来源？