DEV Community: Md Nazmul Islam

What is Flutter Layout Builder?

Md Nazmul Islam — Sat, 22 Oct 2022 02:52:53 +0000

In Flutter, LayoutBuilder Widget is similar to the Builder widget except that the framework calls the builder function at layout time and provides the parent widget's constraints. This is useful when the parent constrains the child's size and doesn't depend on the child's intrinsic size

In Flutter, it takes only a few steps to put text, an icon, or an image on the screen.

Select a layout widget.
Create a visible widget.
Add the visible widget to the layout widget.
Add the layout widget to the page.

You can read this article to learn more about Flutter layout builder:
Flutter layoutbuilder widget example
You can also learn more from this website:Mobile app development

How to switch the image on Android?

Md Nazmul Islam — Sat, 22 Oct 2022 02:49:54 +0000

Sometimes you don't want an image to appear abruptly on the screen, rather you want to apply some kind of animation to the image when it transitions from one image to another. This is supported by android in the form of ImageSwitcher.

An image switcher allows you to add some transitions on the images through the way they appear on screen. In order to use image Switcher, you need to define its XML component first. Its syntax is given below −

android:id="@+id/imageSwitcher1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" >

Now we create an intance of ImageSwithcer in java file and get a reference of this XML component. Its syntax is given below −

private ImageSwitcher imageSwitcher;
imageSwitcher = (ImageSwitcher)findViewById(R.id.imageSwitcher1);
The next thing we need to do implement the ViewFactory interface and implement unimplemented method that returns an imageView. Its syntax is below −

imageSwitcher.setImageResource(R.drawable.ic_launcher);
imageSwitcher.setFactory(new ViewFactory() {
public View makeView() {
ImageView myView = new ImageView(getApplicationContext());
return myView;
}
}
The last thing you need to do is to add Animation to the ImageSwitcher. You need to define an object of Animation class through AnimationUtilities class by calling a static method loadAnimation. Its syntax is given below −

Animation in = AnimationUtils.loadAnimation(this,android.R.anim.slide_in_left);
imageSwitcher.setInAnimation(in);
imageSwitcher.setOutAnimation(out);

You can learn more about image switcher on android from this article: Image Switcher in Android Example Programmatically

[Solved]Flutter PackageManger depreceated

Md Nazmul Islam — Mon, 17 Oct 2022 05:01:49 +0000

I'm facing an issue after changing the github branch. This issue is getting when we change the compile sdk version to 33.
This issue solve by flutter service team.
Just set the pubspec.yaml below code.

packagemanager: any
How to solve the flutter packagemanager deprecated