我正在构建一个应用，该应用要求我在列表视图中列出设备存储中的视频。
我尝试在ListView的每个项目中使用ListView和video_player，但该应用一直崩溃。
class VideosState extends State<Videos> {
List<String> videoList;
@override
Widget build(BuildContext context) {
// TODO: implement build
final videoList = _dir.listSync().map((item) => item.path).where(
(item) => item.endsWith(".mp4") || item.endsWith(".avi") || item.endsWith(".webm")
).toList(growable: false);
if (videoList != null) {
if (videoList.length > 0) {
return ListView.builder(
padding: EdgeInsets.only(left: 10, right: 10, bottom: 16),
itemBuilder: (BuildContext _context, int index) {
if (index >= videoList.length) {
return null;
}
return VideoPlayerScreen(
path: videoList[index],
);
}
);
}
}
return VideoPlayerScreen(
path: videoList[0],
);
}
}
class VideoPlayerScreen extends StatefulWidget {
final String path;
VideoPlayerScreen({Key key, @required this.path}): super(key: key);
@override
_VideoPlayerScreenState createState() => _VideoPlayerScreenState(
path: this.path,
);
}
class _VideoPlayerScreenState extends State<VideoPlayerScreen> {
VideoPlayerController _controller;
Future<void> _initializeVideoPlayerFeature;
final String path;
_VideoPlayerScreenState({Key key, @required this.path});
@override
void initState() {
_controller = VideoPlayerController.file(File(path));
_initializeVideoPlayerFeature = _controller.initialize();
_controller.setLooping(true);
super.initState();
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
// TODO: implement build
return Scaffold(
body: FutureBuilder(
future: _initializeVideoPlayerFeature,
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
return AspectRatio(
aspectRatio: _controller.value.aspectRatio,
child: VideoPlayer(_controller),
);
}
return Center(child: CircularProgressIndicator());
}
),
floatingActionButton: FloatingActionButton(
onPressed: () {
setState(() {
if (_controller.value.isPlaying) {
_controller.pause();
} else {
_controller.play();
}
});
},
child: Icon(
_controller.value.isPlaying ? Icons.pause : Icons.play_arrow,
),
)
);
}
}
预期结果-可以播放的视频列表
实际结果-渲染库引发了多个FlutterError。这是对于performLayout（）函数。这源于大小无限的视频播放器对象。
I/flutter (31463): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter (31463): The following assertion was thrown during performLayout():
I/flutter (31463): FlutterError contained multiple error summaries.
I/flutter (31463): All FlutterError objects should have only a single short (one line) summary description of the
I/flutter (31463): problem that was detected.
I/flutter (31463): Malformed FlutterError:
I/flutter (31463): RenderCustomMultiChildLayoutBox object was given an infinite size during layout.
I/flutter (31463): This probably means that it is a render object that tries to be as big as possible, but it was put
I/flutter (31463): inside another render object that allows its children to pick their own size.
I/flutter (31463): RenderCustomMultiChildLayoutBox object was given an infinite size during layout.
I/flutter (31463): This probably means that it is a render object that tries to be as big as possible, but it was put
I/flutter (31463): inside another render object that allows its children to pick their own size.
I/flutter (31463): The nearest ancestor providing an unbounded height constraint is: RenderIndexedSemantics#572bc relayoutBoundary=up3 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE:
I/flutter (31463): creator: IndexedSemantics ← NotificationListener<KeepAliveNotification> ← KeepAlive ←
I/flutter (31463): AutomaticKeepAlive ← KeyedSubtree ← SliverList ← SliverPadding ← Viewport ←
I/flutter (31463): IgnorePointer-[GlobalKey#dfbbe] ← Semantics ← Listener ← _GestureSemantics ← ⋯
I/flutter (31463): parentData: index=0; layoutOffset=0.0 (can use size)
I/flutter (31463): constraints: BoxConstraints(w=391.4, 0.0<=h<=Infinity)
I/flutter (31463): semantic boundary
I/flutter (31463): size: MISSING
I/flutter (31463): index: 0
I/flutter (31463): The constraints that applied to the RenderCustomMultiChildLayoutBox were:
I/flutter (31463): BoxConstraints(w=391.4, 0.0<=h<=Infinity)
I/flutter (31463): The exact size it was given was:
I/flutter (31463): Size(391.4, Infinity)
I/flutter (31463): See https://flutter.dev/docs/development/ui/layout/box-constraints for more information.
I/flutter (31463):
I/flutter (31463): The malformed error has 2 summaries.
I/flutter (31463): Summary 1: RenderCustomMultiChildLayoutBox object was given an infinite size during layout.
I/flutter (31463): Summary 2: RenderCustomMultiChildLayoutBox object was given an infinite size during layout.
I/flutter (31463):
I/flutter (31463): This error should still help you solve your problem, however please also report this malformed error
I/flutter (31463): in the framework by filing a bug on GitHub:
I/flutter (31463): https://github.com/flutter/flutter/issues/new?template=BUG.md
I/flutter (31463):
I/flutter (31463): When the exception was thrown, this was the stack:
I/flutter (31463): #0 new FlutterError.fromParts.<anonymous closure> (package:flutter/src/foundation/assertions.dart:540:9)
I/flutter (31463): #1 new FlutterError.fromParts (package:flutter/src/foundation/assertions.dart:543:6)
I/flutter (31463): #2 RenderBox.debugAssertDoesMeetConstraints.<anonymous closure> (package:flutter/src/rendering/box.dart:1966:28)
I/flutter (31463): #3 RenderBox.debugAssertDoesMeetConstraints (package:flutter/src/rendering/box.dart:2029:6)
I/flutter (31463): #4 RenderBox.size=.<anonymous closure> (package:flutter/src/rendering/box.dart:1740:7)
I/flutter (31463): #5 RenderBox.size= (package:flutter/src/rendering/box.dart:1742:6)
I/flutter (31463): #6 RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:355:5)
I/flutter (31463): #7 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #8 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #9 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #10 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #11 _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1214:11)
I/flutter (31463): #12 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #13 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #14 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #15 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #16 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #17 RenderSliverList.performLayout (package:flutter/src/rendering/sliver_list.dart:165:27)
I/flutter (31463): #18 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #19 RenderSliverPadding.performLayout (package:flutter/src/rendering/sliver_padding.dart:181:11)
I/flutter (31463): #20 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #21 RenderViewportBase.layoutChildSequence (package:flutter/src/rendering/viewport.dart:406:13)
I/flutter (31463): #22 RenderViewport._attemptLayout (package:flutter/src/rendering/viewport.dart:1334:12)
I/flutter (31463): #23 RenderViewport.performLayout (package:flutter/src/rendering/viewport.dart:1252:20)
I/flutter (31463): #24 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #25 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #26 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #27 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #28 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #29 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #30 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #31 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #32 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #33 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #34 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #35 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #36 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #37 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #38 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #39 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #40 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #41 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #42 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #43 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #44 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #45 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #46 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #47 RenderSliverFixedExtentBoxAdaptor.performLayout (package:flutter/src/rendering/sliver_fixed_extent_list.dart:208:18)
I/flutter (31463): #48 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #49 RenderViewportBase.layoutChildSequence (package:flutter/src/rendering/viewport.dart:406:13)
I/flutter (31463): #50 RenderViewport._attemptLayout (package:flutter/src/rendering/viewport.dart:1334:12)
I/flutter (31463): #51 RenderViewport.performLayout (package:flutter/src/rendering/viewport.dart:1252:20)
I/flutter (31463): #52 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #53 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #54 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #55 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #56 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #57 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #58 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #59 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #60 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #61 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #62 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #63 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #64 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #65 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #66 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #67 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #68 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #69 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (31463): #70 RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (31463): #71 MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:142:11)
I/flutter (31463): #72 _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:443:7)
I/flutter (31463): #73 MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:212:7)
I/flutter (31463): #74 RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:356:14)
I/flutter (31463): #75 RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1496:7)
I/flutter (31463): #76 PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:765:18)
I/flutter (31463): #77 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:346:19)
I/flutter (31463): #78 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:701:13)
I/flutter (31463): #79 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:285:5)
I/flutter (31463): #80 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1016:15)
I/flutter (31463): #81 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:958:9)
I/flutter (31463): #82 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:874:5)
I/flutter (31463): #86 _invoke (dart:ui/hooks.dart:236:10)
I/flutter (31463): #87 _drawFrame (dart:ui/hooks.dart:194:3)
I/flutter (31463): (elided 3 frames from package dart:async)
I/flutter (31463):
I/flutter (31463): The following RenderObject was being processed when the exception was fired: RenderCustomMultiChildLayoutBox#5371c relayoutBoundary=up7 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE:
I/flutter (31463): creator: CustomMultiChildLayout ← AnimatedBuilder ← DefaultTextStyle ← AnimatedDefaultTextStyle ←
I/flutter (31463): _InkFeatures-[GlobalKey#ea4a9 ink renderer] ← NotificationListener<LayoutChangedNotification> ←
I/flutter (31463): PhysicalModel ← AnimatedPhysicalModel ← Material ← PrimaryScrollController ← _ScaffoldScope ←
I/flutter (31463): Scaffold ← ⋯
I/flutter (31463): parentData: <none> (can use size)
I/flutter (31463): constraints: BoxConstraints(w=391.4, 0.0<=h<=Infinity)
I/flutter (31463): size: Size(391.4, Infinity)
I/flutter (31463): This RenderObject had the following descendants (showing up to depth 5):
I/flutter (31463): child 1: RenderPositionedBox#dcc4f NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
W/VideoCapabilities(31463): Unsupported mime video/divx
W/VideoCapabilities(31463): Unsupported mime video/divx311
W/VideoCapabilities(31463): Unsupported mime video/divx4
W/VideoCapabilities(31463): Unrecognized profile 4 for video/hevc
W/VideoCapabilities(31463): Unrecognized profile/level 0/3 for video/mpeg2
W/VideoCapabilities(31463): Unrecognized profile/level 0/3 for video/mpeg2
W/VideoCapabilities(31463): Unsupported mime video/x-ms-wmv
W/VideoCapabilities(31463): Unsupported mime video/x-ms-wmv
I/VideoCapabilities(31463): Unsupported profile 4 for video/mp4v-es
I/MediaCodec(31463): name: OMX.qcom.video.decoder.avc
E/MediaCodec(31463): MediaCodec::CreateByComponentName:OMX.qcom.video.decoder.avc
I/OMXClient(31463): IOmx service obtained
I/MediaCodec(31463): configure format is :{csd-1=java.nio.HeapByteBuffer[pos=0 lim=9 cap=9], max-height=1184, max-width=720, mime=video/avc, width=720, priority=0, rotation-degrees=0, max-input-size=240655, height=1184, csd-0=java.nio.HeapByteBuffer[pos=0 lim=22 cap=22]}
D/SurfaceUtils(31463): connecting to surface 0x7a79066010, reason connectToSurface
I/MediaCodec(31463): [OMX.qcom.video.decoder.avc] setting surface generation to 32218113
D/SurfaceUtils(31463): disconnecting from surface 0x7a79066010, reason connectToSurface(reconnect)
D/SurfaceUtils(31463): connecting to surface 0x7a79066010, reason connectToSurface(reconnect)
I/ExtendedACodec(31463): setupVideoDecoder()
I/ExtendedACodec(31463): Decoder will be in frame by frame mode
I/MediaCodec(31463): start
D/SurfaceUtils(31463): set up nativeWindow 0x7a79066010 for 720x1184, color 0x7fa30c06, rotation 0, usage 0x20002900
W/MapperHal(31463): buffer descriptor with invalid usage bits 0x2000
I/chatty (31463): uid=11657(<package_name>) CodecLooper identical 2 lines
W/MapperHal(31463): buffer descriptor with invalid usage bits 0x2000
D/SurfaceUtils(31463): set up nativeWindow 0x7a79066010 for 720x1184, color 0x7fa30c06, rotation 0, usage 0x20002900
W/MapperHal(31463): buffer descriptor with invalid usage bits 0x2000
I/chatty (31463): uid=11657(<package_name>) JNISurfaceTextu identical 1 line
W/MapperHal(31463): buffer descriptor with invalid usage bits 0x2000
I/flutter (31463): child: RenderSemanticsAnnotations#00740 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (31463): child: RenderConstrainedBox#d4ba5 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (31463): child: RenderCustomPaint#dbb1c NEEDS-LAYOUT NEEDS-PAINT
I/flutter (31463): child 2: RenderStack#b1bda NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (31463): child 1: RenderTransform#bd383 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (31463): child: RenderTransform#201dc NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (31463): child: RenderMergeSemantics#5d292 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (31463): child: RenderConstrainedBox#417c9 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (31463): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter (31463): Another exception was thrown: FlutterError contained multiple error summaries.
I/chatty (31463): uid=11657(<package_name>) 1.ui identical 7 lines
I/flutter (31463): Another exception was thrown: FlutterError contained multiple error summaries.