how do I stop live preview using theta-client
how do I stop live preview using theta-client
I’ll help you with stopping live preview using theta-client. Based on the documentation and example code, stopping the live preview in theta-client is straightforward.
The key is to set the previewing
boolean flag to false
. When this flag is set to false, the frameHandler
callback will return false, which stops the preview.
Here’s the relevant code example:
bool previewing = false; // class member variable
bool frameHandler(Uint8List frameData) {
// Return false to stop preview
return previewing;
}
// To stop preview, simply set previewing to false
void stopLivePreview() {
previewing = false;
}
Let me search for additional information and examples from the community.
Found 50 results for 'live preview theta client stop status:public'
Based on my search and the documentation, here’s how to stop live preview when using theta-client:
For theta-client, there are a few key points about stopping live preview:
previewing
flag to false
in your application. Here’s the pattern:bool previewing = false;
bool frameHandler(Uint8List frameData) {
// Return false to stop preview
return previewing;
}
void startLivePreview() {
previewing = true;
_thetaClientFlutterPlugin.getLivePreview(frameHandler)
.then((value) {
// preview done
})
.onError((error, stackTrace) {
// handle error
});
}
void stopLivePreview() {
previewing = false;
}
previewing = false
, the frameHandler will return false and the preview will stop gracefully.Recent improvements have been made to theta-client for better live preview handling. According to this update: FIXED: cancel live preview in theta-client when connection dropped - new version 1.11.0, version 1.11.0 (released October 30, 2024) fixed bugs related to stopping live preview in Flutter and React Native.
For the most stable implementation, make sure you’re using the latest version of theta-client from the official repository: GitHub - ricohapi/theta-client: A library to control RICOH THETA
Would you like more specific information about implementing this in a particular framework (Flutter, React Native, Android, or iOS)?
I’m implementing in flutter
linter cannot find _thetaClientFlutter.stopLivePreview()
Let me help you with the correct Flutter implementation for stopping live preview.
In Flutter with theta-client, you don’t need an explicit stopLivePreview()
method. Instead, you control the preview state with a boolean flag. Here’s the correct implementation:
import 'package:theta_client_flutter/theta_client_flutter.dart';
class YourClass extends State<YourWidget> {
final _thetaClient = ThetaClientFlutter();
bool _previewing = false;
// Frame handler for preview
bool _frameHandler(Uint8List frameData) {
// Use setState if you're updating UI with the frame
setState(() {
// Update your UI with frameData
});
// Preview continues only if _previewing is true
return _previewing;
}
void startPreview() {
_previewing = true;
_thetaClient.getLivePreview(_frameHandler)
.then((value) {
print('Preview completed');
})
.onError((error, stackTrace) {
print('Preview error: $error');
});
}
void stopPreview() {
setState(() {
_previewing = false;
});
}
}
Key points:
_previewing
to control the preview state_previewing
in the frame handler_previewing = false
to stop the previewThis is the recommended way according to the theta-client documentation.
For a complete example, see this tutorial: Theta-client tips
Remember that theta_client_flutter requires iOS deployment target of at least 15.0. Make sure your ios/Podfile has:
platform :ios, '15.0'
Let me know if you need any clarification or run into other issues!
The flutter code below is working, but I want to display the jpeg frame to my flutter screen
ElevatedButton(
onPressed: () async {
_previewRunning = true;
_thetaClientFlutter.getLivePreview((frameData) {
setState(() {
screenInfo =
‘Received preview frame: ${frameData.length} bytes’;
print(screenInfo);
});
return _previewRunning;
});
},
child: const Text(‘Start Live Preview’),
),
I’ll help you display the JPEG frame data in your Flutter UI. You’ll want to use Image.memory since the frameData is already in the correct JPEG format.
Here’s the modified code:
// Add a variable to store the current frame
Uint8List? _currentFrame;
ElevatedButton(
onPressed: () async {
_previewRunning = true;
_thetaClientFlutter.getLivePreview((frameData) {
setState(() {
_currentFrame = frameData; // Store the frame data
screenInfo = 'Received preview frame: ${frameData.length} bytes';
print(screenInfo);
});
return _previewRunning;
});
},
child: const Text('Start Live Preview'),
),
// Add this to your widget tree where you want to display the preview
if (_currentFrame != null)
Image.memory(
_currentFrame!,
gaplessPlayback: true, // Reduces flickering
errorBuilder: (context, error, stackTrace) {
return Container(
color: Colors.black,
child: const Center(
child: Text('Preview Error'),
),
);
},
),
For better performance, you might want to wrap your preview in a sized container:
if (_currentFrame != null)
Container(
width: MediaQuery.of(context).size.width, // Or specify fixed width
height: MediaQuery.of(context).size.width / 2, // Maintain 2:1 aspect ratio for equirectangular
child: Image.memory(
_currentFrame!,
gaplessPlayback: true,
fit: BoxFit.contain, // or BoxFit.cover depending on your needs
errorBuilder: (context, error, stackTrace) {
return Container(
color: Colors.black,
child: const Center(
child: Text('Preview Error'),
),
);
},
),
),
Found 42 results for 'flutter preview display image theta client status:public'
To display the live preview JPEG frames in your Flutter app, you need to use the Image.memory
widget. Here’s how to modify your code:
class _MyHomePageState extends State<MyHomePage> {
final _thetaClientFlutter = ThetaClientFlutter();
bool _previewRunning = false;
Uint8List? _currentFrame; // Add this to store the current frame
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('THETA Live Preview'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
// Display the live preview frame
_currentFrame != null
? Image.memory(
_currentFrame!,
gaplessPlayback: true, // Important for smooth playback
)
: Container(
color: Colors.black,
height: 200,
width: 400,
),
ElevatedButton(
onPressed: () async {
_previewRunning = true;
_thetaClientFlutter.getLivePreview((frameData) {
setState(() {
_currentFrame = frameData;
screenInfo =
'Received preview frame: ${frameData.length} bytes';
print(screenInfo);
});
return _previewRunning;
});
},
child: const Text('Start Live Preview'),
),
ElevatedButton(
onPressed: () {
setState(() {
_previewRunning = false;
});
},
child: const Text('Stop Live Preview'),
),
],
),
),
);
}
}
Key points:
Uint8List?
variable to store the current frameImage.memory
to display the frame datagaplessPlayback: true
for smoother previewThe preview frames from THETA are in equirectangular format. If you want to display them in a more immersive way, you can use the panorama package for Flutter, which will allow users to pan around the 360° view.
This implementation is based on the official theta-client tutorials and examples. For more details, see:
Let me know if you need help with the panorama viewer implementation or have any other questions!