Android Support Library The best practice of custom view
Android Support Library The best practice of custom view
In Android development, custom view is a very common demand, which can help us achieve more complex and personalized interface interaction effects.However, in order to better manage and maintain custom views, we can use some functions and best practices provided by Android Support Library.
1. Use AppCompat theme
In custom views, we should use the AppCompat theme to ensure the consistency of our programs on different devices and Android versions.AppCompat provides many UI elements and functions that have nothing to do with the system version, such as Toolbar, TextInputLayout, etc.We can use UI elements or styles with an AppCompat prefix in the XML file of a custom view to ensure compatibility, such as AppCompatButton, AppCompattextView, etc.
2. Use the attributes and styles of AppCompat
In addition to using the AppCompat theme, we can also use the attributes and styles of AppCompat to keep the custom view consistent with the AppCompat theme.For example, you can use the APP: Popuptheme property to specify the theme of the pop -up menu to ensure that it is consistent with the AppCompat theme.In addition, the color of attributes such as ATTR/Colorprimary and other attributes can reference the color in the theme of the system, which can make the custom view has a consistent color style under different topics.
3. Use Support Annotations
Using SUPPORT Annotions can provide better code prompts and static analysis to ensure that we follow the correct specifications and usage methods when using a custom view.For example, you can use @nulLive and @nonnull annotations to mark the parameter parameter and return value of the method, reminding developers to make non -empty judgments when using custom views to avoid empty pointer abnormalities.
4. Use a vector icon
In order to obtain better screen adaptability and icon quality, we should give priority to using vector drawable instead of bitmap drawable.By loading and displaying vector icons by using VectRDRAWABLECOMPAT provided in the AppCompat library, we can get high -quality icon effects under different devices and DPIs.
5. Use VectordrawAbleCompat to achieve the animation effect
VectRDRAWABLECOMPAT can also combine AnimatedVectordaWablecompat to achieve the animation effect of the vector icon.By defining an AnimatedvectordRDRAWABLOMPAT animation resource file, and using Animator to play the animation in a custom view, we can achieve some very cool vector icon animation effects, such as path deformation, path filling and color changes.
Below is a Java code example using Android Support Library custom view:
import android.content.Context;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.widget.AppCompatImageView;
import android.util.AttributeSet;
public class CustomImageView extends AppCompatImageView {
private FloatingActionButton fab;
public CustomImageView(Context context) {
super(context);
init(context);
}
public CustomImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public CustomImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
private void init(Context context) {
// Use AppCompat elements in a custom view to make sure
fab = new FloatingActionButton(context);
// Use AppCompat attributes and styles, which is consistent with the AppCompat theme
fab.setSupportBackgroundTintList(getContext().getResources().getColorStateList(R.color.fab_background_color));
setOnClickListener((view) -> {
// Perform the clicks of custom viewing event processing logic
});
}
}
Summarize:
By using the functions and best practices provided by Android Support Library, we can better manage and maintain custom views to improve the compatibility and consistency of the program.Use AppCompat theme and elements, use the attributes and styles of AppCompat, use the SUPPORT Annotations, use vector icons, and use VECTORDRAWABLECOMPAT to achieve the animation effect, which can make our custom view more modern, flexible and adaptable to different devices and Android versions.
I hope this article provides some help and guidance for you to use Android Support Library's custom view in Android development.
