Why do I get this error? Example As a real world comparison, what just happened is this conversation: Hey, how much gas is left in the tank of the car? What are you talking about, we don’t have a car. That is exactly what is happening in your program. You wanted to call a function … Read more
dispose method used to release the memory allocated to variables when state object is removed. For example, if you are using a stream in your application then you have to release memory allocated to the stream controller. Otherwise, your app may get a warning from the PlayStore and AppStore about memory leakage.
I have handled the network image issue related to 404 by using an errorBuilder. Image.network(‘Your image url…’, errorBuilder: (BuildContext context, Object exception, StackTrace stackTrace) { return Text(‘Your error widget…’); }, ), errorBuilder property
For child ListView, use that parameter: shrinkWrap: true, physics: ClampingScrollPhysics(),
In my case, it likes a hot reload bug. Just restart debugging works for me.
BuildContext is, like it’s name is implying, the context in which a specific widget is built. If you’ve ever done some React before, that context is kind of similar to React’s context (but much smoother to use) ; with a few bonuses. Generally speaking, there are 2 use cases for context : Interact with your … Read more
Small Update: When used for whitespace, there is now even a linter warning to prefer SizedBox instead of Container. The main advantage seems to be that SizedBox can be const and won’t even create a new instance during runtime. Thanks to the magic of open source, you don’t have to guess too much. Container is … Read more
Android 12 require you to add a piece of code to your main activity Go to your project folder and open AndroidManifest.xml file Add the below code in activity android:exported=”true” Reference: <activity android:name=”.MainActivity” android:exported=”true” android:launchMode=”singleTop” android:theme=”@style/LaunchTheme”> </activity>
You will want to use the LayoutBuilder widget which will build at layout time and provides the parent widget’s constraints. The LayoutBuilder takes in a build() function which has the the standard BuildContext along with the BoxConstraints as parameters that can be used to help dynamically render widgets based on size. Let’s build a simple … Read more
Change your code to accept a VoidCallback instead of Function for the onPressed. By the way VoidCallback is just shorthand for void Function() so you could also define it as final void Function() onPressed; Updated code: class DrawerItem extends StatelessWidget { final String text; final VoidCallback onPressed; const DrawerItem({Key key, this.text, this.onPressed}) : super(key: key); … Read more