How to use Android Support Library custom view in the Java library
How to use Android Support Library custom view in the Java library
Introduction:
Android Support Library is a set of compatible libraries, which aims to provide developers with a backward compatibility function and UI interface for developers.In this article, we will introduce how to use Android Support Library in the Java library to create a custom view.
step:
1. Add the support library dependency item:
Add the following dependencies to your Java project's Build.gradle file:
dependencies {
implementation 'com.android.support:support-v4:29.0.0'
implementation 'com.android.support:appcompat-v7:29.0.0'
}
This will ensure that you can use a class in Android Support Library to create a custom view.
2. Create a custom view class:
Create a new Java class and inherit the View class in Android Support Library.For example, we create a customized ButtonView class:
import android.content.Context;
import android.support.v7.widget.AppCompatButton;
public class ButtonView extends AppCompatButton {
public ButtonView(Context context) {
super(context);
// Perform the initialization of custom views here
}
}
In this example, we created a ButtonView class inherited from AppCompatButton.
3. The use of custom view:
When using a custom view in your project, you can declare and use it in the XML layout file like other views.For example, in an activity_main.xml file, add the ButtonView View:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.example.myapp.ButtonView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Custom Button" />
</LinearLayout>
In this example, we use the custom ButtonView as a normal button.
Summarize:
Using Android Support Library can easily create a custom view in the Java library.By following the above steps, you can add the required dependencies, create a custom view class, and use them in the XML layout file.In this way, you can create a custom view compatible with Android applications in the Java library.
