"Bridging Mode" of Design Patterns

What is bridge mode

The Bridge pattern is a structural design pattern that separates the abstraction from the implementation so that they can vary independently. It increases the flexibility and scalability of the system by combining abstract parts (such as classes or interfaces) into implementation parts (such as classes or interfaces), decoupling the two.

Why use bridge mode

The bridge pattern separates abstraction and implementation, reducing the degree of coupling between them so that they can change relatively independently. This means that when we need to add or modify an abstraction or implementation in the system, this will not affect the stability and reliability of the entire system. In addition, bridge mode can also make the system easier to maintain and test.

Where do you use it at work

In Android development, bridge mode can be used to deal with complex interface design issues. For example, an application may need to display different graphical interfaces on different Android platforms, but the code used by these interfaces may be similar. In this case, we can separate the interface design code (implementation part) from the Android platform (abstract part), making them vary independently. In this way, when we need to add or modify a certain interface, we only need to modify the implementation part without affecting the entire system.

Design ideas

In the bridge pattern, we need to define two parts that change independently: the abstract part and the implementation part. The abstract part is usually an abstract class or interface that defines the functionality and properties required by the system. The implementation part is usually a concrete class or interface that implements the functions and properties required by the abstract part. By combining abstract parts into implementation parts, we can decouple them, which increases the flexibility and scalability of the system.

Code Implementation of Bridge Mode

The following code sample demonstrates how to use bridge mode to handle interface design issues in Android.
abstract part

public abstract class UIComponent {
    
    
    protected UIImplementation implementation;

    public UIComponent(UIImplementation implementation) {
    
    
        this.implementation = implementation;
    }

    public abstract void display();
}

Implementation part

public interface UIImplementation {
    
    
    void showButton();
    void showLabel();
    void showTextField();
}

public class AndroidUIImplementation implements UIImplementation {
    
    

    @Override
    public void showButton() {
    
    
        // Android-specific code for displaying a button
    }

    @Override
    public void showLabel() {
    
    
        // Android-specific code for displaying a label
    }

    @Override
    public void showTextField() {
    
    
        // Android-specific code for displaying a text field
    }
}

Demonstrates how to create an Android button using bridge mode

public class AndroidButton extends UIComponent {
    
    
    public AndroidButton(UIImplementation implementation) {
    
    
        super(implementation);
    }

    @Override
    public void display() {
    
    
        implementation.showButton();
    }
}

Demonstrates how to use multiple UI components in Android

public class MainActivity extends AppCompatActivity {
    
    

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
    
        super.onCreate(savedInstanceState);

        // Create and display an Android button
        UIComponent button = new AndroidButton(new AndroidUIImplementation());
        button.display();

        // Create and display an Android label
        UIComponent label = new AndroidLabel(new AndroidUIImplementation());
        label.display();

        // Create and display an Android text field
        UIComponent textField = new AndroidTextField(new AndroidUIImplementation());
        textField.display();
    }
}

Summarize

The Bridge pattern is a structural design pattern that separates the abstraction from the implementation so that they can vary independently. In Android development, the bridge mode can be used to deal with complex interface design issues, making the interface design code and Android platform change independently, thereby improving the flexibility and scalability of the system.