使用建造者模式封装通用弹窗PopupWindow

2023-09-19 13:29:16

PopupWindow建造者模式：轻松创建Android弹窗

简介

在Android应用程序开发中，经常需要使用弹窗来显示信息或收集用户输入。为了简化这一过程并提高开发效率，我们可以利用建造者模式。本文将介绍如何使用建造者模式创建通用的PopupWindow建造者，以方便快捷地创建不同样式的弹窗。

建造者模式

建造者模式是一种设计模式，允许通过逐步构建的方式创建复杂对象。这种模式适用于创建具有许多可选属性或配置的对象，因为我们可以根据需要选择或配置这些属性或配置。

PopupWindow建造者

在PopupWindow建造者模式中，我们将定义一个抽象建造者类，它包含创建PopupWindow所需的通用属性和方法。然后，我们可以创建多个具体建造者类，每个具体建造者类都继承自抽象建造者类，并提供创建不同样式的PopupWindow的具体实现。

抽象建造者类

public abstract class PopupWindowBuilder {

    protected Context context;
    protected int width;
    protected int height;
    protected int gravity;
    protected int animationStyle;
    protected View contentView;

    public PopupWindowBuilder(Context context) {
        this.context = context;
    }

    public PopupWindowBuilder setWidth(int width) {
        this.width = width;
        return this;
    }

    public PopupWindowBuilder setHeight(int height) {
        this.height = height;
        return this;
    }

    public PopupWindowBuilder setGravity(int gravity) {
        this.gravity = gravity;
        return this;
    }

    public PopupWindowBuilder setAnimationStyle(int animationStyle) {
        this.animationStyle = animationStyle;
        return this;
    }

    public PopupWindowBuilder setContentView(View contentView) {
        this.contentView = contentView;
        return this;
    }

    public abstract PopupWindow build();
}

具体建造者类

public class SimplePopupWindowBuilder extends PopupWindowBuilder {

    public SimplePopupWindowBuilder(Context context) {
        super(context);
    }

    @Override
    public PopupWindow build() {
        PopupWindow popupWindow = new PopupWindow(context);
        popupWindow.setWidth(width);
        popupWindow.setHeight(height);
        popupWindow.setGravity(gravity);
        popupWindow.setAnimationStyle(animationStyle);
        popupWindow.setContentView(contentView);
        return popupWindow;
    }
}

public class DeluxePopupWindowBuilder extends PopupWindowBuilder {

    private int backgroundColor;
    private int borderColor;
    private int borderRadius;

    public DeluxePopupWindowBuilder(Context context) {
        super(context);
    }

    public DeluxePopupWindowBuilder setBackgroundColor(int backgroundColor) {
        this.backgroundColor = backgroundColor;
        return this;
    }

    public DeluxePopupWindowBuilder setBorderColor(int borderColor) {
        this.borderColor = borderColor;
        return this;
    }

    public DeluxePopupWindowBuilder setBorderRadius(int borderRadius) {
        this.borderRadius = borderRadius;
        return this;
    }

    @Override
    public PopupWindow build() {
        PopupWindow popupWindow = new PopupWindow(context);
        popupWindow.setWidth(width);
        popupWindow.setHeight(height);
        popupWindow.setGravity(gravity);
        popupWindow.setAnimationStyle(animationStyle);
        popupWindow.setContentView(contentView);
        popupWindow.setBackgroundDrawable(new ColorDrawable(backgroundColor));
        popupWindow.setOutsideTouchable(true);
        popupWindow.setFocusable(true);
        return popupWindow;
    }
}

使用建造者模式创建PopupWindow

PopupWindow simplePopupWindow = new SimplePopupWindowBuilder(context)
        .setWidth(300)
        .setHeight(200)
        .setGravity(Gravity.CENTER)
        .setAnimationStyle(R.style.Animation_PopupWindow_Fade)
        .setContentView(new TextView(context, "Hello World!"))
        .build();

PopupWindow deluxePopupWindow = new DeluxePopupWindowBuilder(context)
        .setWidth(400)
        .setHeight(300)
        .setGravity(Gravity.CENTER)
        .setAnimationStyle(R.style.Animation_PopupWindow_Slide)
        .setContentView(new Button(context, "Click Me!"))
        .setBackgroundColor(Color.WHITE)
        .setBorderColor(Color.BLACK)
        .setBorderRadius(10)
        .build();