封装一个万能的PopupWindow

由于项目中很多地方需要用到PopupWindow,而PopupWindow虽然使用起来不难,就是那些东西每次都要去配置,显得很麻烦,于是乎我干脆封装一个.
是用构建者模式封装的,链式调用,方便使用.

我们先来看看一般情况下,PopupWindow的使用

//准备PopupWindow的布局ViewView popupView = LayoutInflater.from(this).inflate(R.layout.popup, null);//初始化一个PopupWindow，width和height都是WRAP_CONTENTPopupWindow popupWindow = new PopupWindow(   ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);//设置PopupWindow的视图内容popupWindow.setContentView(popupView);//点击空白区域PopupWindow消失，这里必须先设置setBackgroundDrawable，否则点击无反应popupWindow.setBackgroundDrawable(new ColorDrawable(0x00000000));popupWindow.setOutsideTouchable(true);//设置PopupWindow动画popupWindow.setAnimationStyle(R.style.AnimDown);//设置是否允许PopupWindow的范围超过屏幕范围popupWindow.setClippingEnabled(true);//设置PopupWindow消失监听popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {    @Override    public void onDismiss() {    } });//PopupWindow在targetView下方弹出popupWindow.showAsDropDown(targetView);

再来看看我封装之后的使用方式:

final PopupWindowHelper.Builder builder = new PopupWindowHelper.Builder();builder.context(this)        .view(mSelectPriceStarView)        .anchor(mSearchPriceStarTv)        .alpha(0.5f)        .width(DisplayUtil.WIDTH_PI)        .height(DisplayUtil.HEIGHT_PI / 2)        .backgroundDrawable(new ColorDrawable())        .focusable(true)        .style(R.style.popwin_anim_style)        .position(PopupWindowHelper.SCREEN_BOTTOM);final PopupWindowHelper popupWindowHelper = builder.build();PopupWindow popupWindow = popupWindowHelper.show();

首先,分析一下需要哪些配置信息

• Context
• 锚
• 布局id
• 需要显示的View
• PopupWindow宽度
• PopupWindow高度
• PopupWindow style
• PopupWindow点击外部是否取消
• 透明度
• 背景
• PopupWindow弹出位置

大概就是上面这些了.有了配置信息,我们来创建Builder

public static class Builder {    private Context context;    private View anchor;    private int layoutId = -1;    private View showView;    private int width;    private int height;    private int style;    private boolean focusable;    private float alpha;    private Drawable backgroundDrawable;    private int popupPosition;    /**        * Context (必填)        */    public Builder context(@NonNull Context context) {        this.context = context;        return this;    }    /**        * 锚  (必填)        */    public Builder anchor(@NonNull View view) {        this.anchor = view;        return this;    }    /**        * 布局id (布局id和view选填1个)        */    public Builder layout(int layoutId) {        this.layoutId = layoutId;        return this;    }    /**        * 需要显示的View (布局id和view选填1个)        */    public Builder view(@NonNull View view) {        this.showView = view;        return this;    }    /**        * PopupWindow宽度        */    public Builder width(int width) {        this.width = width;        return this;    }    /**        * PopupWindow高度        */    public Builder height(int height) {        this.height = height;        return this;    }    /**        * PopupWindow style        */    public Builder style(int style) {        this.style = style;        return this;    }    /**        * PopupWindow点击外部是否取消        */    public Builder focusable(boolean focusable) {        this.focusable = focusable;        return this;    }    /**        * 透明度        */    public Builder alpha(float alpha) {        this.alpha = alpha;        return this;    }    /**        * 背景        */    public Builder backgroundDrawable(Drawable backgroundDrawable) {        this.backgroundDrawable = backgroundDrawable;        return this;    }    /**        * PopupWindow弹出位置        *        * @param popupPosition 可选:LEFT, RIGHT, TOP, BOTTOM, SCREEN_BOTTOM, SCREEN_TOP        */    public Builder position(@PopupPosition int popupPosition) {        this.popupPosition = popupPosition;        return this;    }    /**        * 构建PopupSelectPriceStar   记得调用PopupSelectPriceStar.show()        */    public PopupWindowHelper build() {        if (context == null) {            throw new IllegalArgumentException("Context can't be null!");        }        if (anchor == null) {            throw new IllegalArgumentException("anchor View can't be null!");        }        if (showView == null && layoutId == -1) {            throw new IllegalArgumentException("showView can't be null!");        }        if (backgroundDrawable == null) {            backgroundDrawable = new ColorDrawable();        }        return new PopupWindowHelper(this);    }}

创建封装类PopupWindowHelper

首先私有化构造方法,然后将builder里面的属性设置到PopupWindowHelper中

private PopupWindowHelper(Builder builder) {    this.mContext = builder.context;    this.mAnchor = builder.anchor;    this.mView = builder.showView;    this.mLayoutId = builder.layoutId;    this.mWidth = builder.width;    this.mHeight = builder.height;    this.mStyle = builder.style;    this.mFocusable = builder.focusable;    this.mAlpha = builder.alpha;    this.mBackgroundDrawable = builder.backgroundDrawable;    this.mPopupPosition = builder.popupPosition;}

现在,有了这些东西,可以显示了,PopupWindowHelper提供给外部一个show()方法,用来显示PopupWindow

/*** 显示PopupWindow*/public PopupWindow show() {    //1, 将弹出窗口需要展示的布局加载进来    //View popupView = View.inflate(mContext, mLayoutId, null);    //2, 创建popupWindow    //参数:view,宽度,高度,是否能获取焦点    if (mView != null) {        mPopupWindow = new PopupWindow(mView, mWidth, mHeight, true);    } else if (mLayoutId != -1) {        mView = View.inflate(mContext, mLayoutId, null);        mPopupWindow = new PopupWindow(mView, mWidth, mHeight, true);    }    //3, 设置显示隐藏的动画    mPopupWindow.setAnimationStyle(mStyle);    //4, 在PopupWindow里面就加上下面代码，让键盘弹出时，不会挡住pop窗口。    mPopupWindow.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);    mPopupWindow.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);    //5, 点击空白处时，隐藏掉pop窗口    mPopupWindow.setFocusable(mFocusable);    //6, 隐藏PopupWindow下面的背景透明度    setBackgroundAlpha(mAlpha);    //7, 设置popupWindow的背景颜色  这里需要设置成透明的  这里设置成透明的    mPopupWindow.setBackgroundDrawable(mBackgroundDrawable);    //8, 添加pop窗口关闭事件    mPopupWindow.setOnDismissListener(this);    //9, 位置    switch (mPopupPosition) {        case LEFT:            mPopupWindow.showAsDropDown(mAnchor, -mPopupWindow.getWidth(), -mPopupWindow                    .getHeight()                    / 2 - mAnchor.getHeight() / 2);            break;        case RIGHT:            mPopupWindow.showAsDropDown(mAnchor, mAnchor.getWidth(), (-mPopupWindow                    .getHeight()                    >> 1) - (mAnchor.getHeight() >> 1));            break;        case TOP:            mPopupWindow.showAsDropDown(mAnchor,                    Math.abs(mAnchor.getWidth() / 2 - mPopupWindow.getWidth() / 2),                    -(mPopupWindow.getHeight() + mAnchor.getMeasuredHeight()));            break;        case BOTTOM:            mPopupWindow.showAsDropDown(mAnchor,                    Math.abs(mAnchor.getWidth() / 2 - mPopupWindow.getWidth() / 2), 0);            break;        case SCREEN_BOTTOM:            mPopupWindow.showAtLocation(mAnchor, Gravity.BOTTOM, 0, 0);            break;        case SCREEN_TOP:            mPopupWindow.showAtLocation(mAnchor, Gravity.TOP, 0, 0);            break;        default:            mPopupWindow.showAtLocation(mAnchor, Gravity.BOTTOM, 0, 0);            break;    }    return mPopupWindow;}

完整代码

• 加入注解,代替Java枚举类型
• 提供给外部dismiss()方法,可以控制dismiss()

import android.content.Context;import android.graphics.drawable.ColorDrawable;import android.graphics.drawable.Drawable;import android.support.annotation.IntDef;import android.support.annotation.NonNull;import android.support.v7.app.AppCompatActivity;import android.view.Gravity;import android.view.View;import android.view.WindowManager;import android.widget.PopupWindow;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;/** * Created by feiyang on 2017/12/1 12:48 * Description : 通用的弹出PopupWindow */public class PopupWindowHelper implements PopupWindow.OnDismissListener {    /**     * PopupWindow放在view左边     */    public static final int LEFT = 1000;    /**     * PopupWindow放在view右边     */    public static final int RIGHT = 1001;    /**     * PopupWindow放在view上边     */    public static final int TOP = 1002;    /**     * PopupWindow放在view下边     */    public static final int BOTTOM = 1003;    /**     * PopupWindow放在屏幕底部     */    public static final int SCREEN_BOTTOM = 1004;    /**     * PopupWindow放在屏幕顶部     */    public static final int SCREEN_TOP = 1005;    /**     * popupWindow位置类型   替代Java中的枚举类型     */    @Retention(RetentionPolicy.SOURCE)    @IntDef({LEFT, RIGHT, TOP, BOTTOM, SCREEN_BOTTOM, SCREEN_TOP})    private @interface PopupPosition {    }    private Context mContext;    private View mAnchor;    private View mView;    private int mLayoutId = -1;    private int mWidth;    private int mHeight;    private int mStyle;    private boolean mFocusable;    private float mAlpha;    private Drawable mBackgroundDrawable;    private int mPopupPosition;    private PopupWindow mPopupWindow;    private PopupWindowHelper(Builder builder) {        this.mContext = builder.context;        this.mAnchor = builder.anchor;        this.mView = builder.showView;        this.mLayoutId = builder.layoutId;        this.mWidth = builder.width;        this.mHeight = builder.height;        this.mStyle = builder.style;        this.mFocusable = builder.focusable;        this.mAlpha = builder.alpha;        this.mBackgroundDrawable = builder.backgroundDrawable;        this.mPopupPosition = builder.popupPosition;    }    /**     * PopupWindow dismiss     */    public void dismiss() {        if (mPopupWindow != null) {            mPopupWindow.dismiss();        }    }    /**     * 显示PopupWindow     */    public PopupWindow show() {        //1, 将弹出窗口需要展示的布局加载进来        //View popupView = View.inflate(mContext, mLayoutId, null);        //2, 创建popupWindow        //参数:view,宽度,高度,是否能获取焦点        if (mView != null) {            mPopupWindow = new PopupWindow(mView, mWidth, mHeight, true);        } else if (mLayoutId != -1) {            mView = View.inflate(mContext, mLayoutId, null);            mPopupWindow = new PopupWindow(mView, mWidth, mHeight, true);        }        //3, 设置显示隐藏的动画        mPopupWindow.setAnimationStyle(mStyle);        //4, 在PopupWindow里面就加上下面代码，让键盘弹出时，不会挡住pop窗口。        mPopupWindow.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);        mPopupWindow.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);        //5, 点击空白处时，隐藏掉pop窗口        mPopupWindow.setFocusable(mFocusable);        //6, 隐藏PopupWindow下面的背景透明度        setBackgroundAlpha(mAlpha);        //7, 设置popupWindow的背景颜色  这里需要设置成透明的  这里设置成透明的        mPopupWindow.setBackgroundDrawable(mBackgroundDrawable);        //8, 添加pop窗口关闭事件        mPopupWindow.setOnDismissListener(this);        //9, 位置        switch (mPopupPosition) {            case LEFT:                mPopupWindow.showAsDropDown(mAnchor, -mPopupWindow.getWidth(), -mPopupWindow                        .getHeight()                        / 2 - mAnchor.getHeight() / 2);                break;            case RIGHT:                mPopupWindow.showAsDropDown(mAnchor, mAnchor.getWidth(), (-mPopupWindow                        .getHeight()                        >> 1) - (mAnchor.getHeight() >> 1));                break;            case TOP:                mPopupWindow.showAsDropDown(mAnchor,                        Math.abs(mAnchor.getWidth() / 2 - mPopupWindow.getWidth() / 2),                        -(mPopupWindow.getHeight() + mAnchor.getMeasuredHeight()));                break;            case BOTTOM:                mPopupWindow.showAsDropDown(mAnchor,                        Math.abs(mAnchor.getWidth() / 2 - mPopupWindow.getWidth() / 2), 0);                break;            case SCREEN_BOTTOM:                mPopupWindow.showAtLocation(mAnchor, Gravity.BOTTOM, 0, 0);                break;            case SCREEN_TOP:                mPopupWindow.showAtLocation(mAnchor, Gravity.TOP, 0, 0);                break;            default:                mPopupWindow.showAtLocation(mAnchor, Gravity.BOTTOM, 0, 0);                break;        }        return mPopupWindow;    }    /**     * 设置添加屏幕的背景透明度     *     * @param bgAlpha 0.0-1.0     */    public void setBackgroundAlpha(float bgAlpha) {        if (mContext instanceof AppCompatActivity) {            AppCompatActivity activity = (AppCompatActivity) mContext;            WindowManager.LayoutParams lp = activity.getWindow().getAttributes();            lp.alpha = bgAlpha; //0.0-1.0            activity.getWindow().setAttributes(lp);        }    }    @Override    public void onDismiss() {        //把背景设置回来        setBackgroundAlpha(1f);    }    public static class Builder {        private Context context;        private View anchor;        private int layoutId = -1;        private View showView;        private int width;        private int height;        private int style;        private boolean focusable;        private float alpha;        private Drawable backgroundDrawable;        private int popupPosition;        /**         * Context (必填)         */        public Builder context(@NonNull Context context) {            this.context = context;            return this;        }        /**         * 锚  (必填)         */        public Builder anchor(@NonNull View view) {            this.anchor = view;            return this;        }        /**         * 布局id (布局id和view选填1个)         */        public Builder layout(int layoutId) {            this.layoutId = layoutId;            return this;        }        /**         * 需要显示的View (布局id和view选填1个)         */        public Builder view(@NonNull View view) {            this.showView = view;            return this;        }        /**         * PopupWindow宽度         */        public Builder width(int width) {            this.width = width;            return this;        }        /**         * PopupWindow高度         */        public Builder height(int height) {            this.height = height;            return this;        }        /**         * PopupWindow style         */        public Builder style(int style) {            this.style = style;            return this;        }        /**         * PopupWindow点击外部是否取消         */        public Builder focusable(boolean focusable) {            this.focusable = focusable;            return this;        }        /**         * 透明度         */        public Builder alpha(float alpha) {            this.alpha = alpha;            return this;        }        /**         * 背景         */        public Builder backgroundDrawable(Drawable backgroundDrawable) {            this.backgroundDrawable = backgroundDrawable;            return this;        }        /**         * PopupWindow弹出位置         *         * @param popupPosition 可选:LEFT, RIGHT, TOP, BOTTOM, SCREEN_BOTTOM, SCREEN_TOP         */        public Builder position(@PopupPosition int popupPosition) {            this.popupPosition = popupPosition;            return this;        }        /**         * 构建PopupSelectPriceStar   记得调用PopupSelectPriceStar.show()         */        public PopupWindowHelper build() {            if (context == null) {                throw new IllegalArgumentException("Context can't be null!");            }            if (anchor == null) {                throw new IllegalArgumentException("anchor View can't be null!");            }            if (showView == null && layoutId == -1) {                throw new IllegalArgumentException("showView can't be null!");            }            if (backgroundDrawable == null) {                backgroundDrawable = new ColorDrawable();            }            return new PopupWindowHelper(this);        }    }}