Android 封装一个通用的PopupWindow

来源：互联网发布：微场景模板制作软件编辑：程序博客网时间：2024/05/18 00:50

先上效果图：

完整代码地址已上传Github：CommonPopupWindow

PopupWindow这个类用来实现一个弹出框，可以使用任意布局的View作为其内容，这个弹出框是悬浮在当前activity之上的。

一般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);

上面就是PopupWindow通常需要设置的各个方法，不难，但是稍微有点繁琐，有些是可以复用的，所以封装了一个通用的CommonPopupWindow：

CommonPopupWindow继承自PopupWindow，拥有PopupWindow的各个属性方法，使用类似建造者模式，和AlertDialog的使用方式差不多，CommonPopupWindow使用举例：

CommonPopupWindow popupWindow = new CommonPopupWindow.Builder(this)         //设置PopupWindow布局        .setView(R.layout.popup_down)          //设置宽高        .setWidthAndHeight(ViewGroup.LayoutParams.MATCH_PARENT,                            ViewGroup.LayoutParams.WRAP_CONTENT)         //设置动画        .setAnimationStyle(R.style.AnimDown)         //设置背景颜色，取值范围0.0f-1.0f 值越小越暗 1.0f为透明        .setBackGroundLevel(0.5f)         //设置PopupWindow里的子View及点击事件         .setViewOnclickListener(new CommonPopupWindow.ViewInterface() {            @Override            public void getChildView(View view, int layoutResId) {                TextView tv_child = (TextView) view.findViewById(R.id.tv_child);                tv_child.setText("我是子View");            }        })         //设置外部是否可点击 默认是true        .setOutsideTouchable(true)         //开始构建        .create();//弹出PopupWindowpopupWindow.showAsDropDown(view);

CommonPopupWindow 设置背景：

这里使用的是WindowManager.LayoutParams.alpha属性，看下官网解释：An alpha value to apply to this entire window. An alpha of 1.0 means fully opaque and 0.0 means fully transparent .alpha 值适用于整个Window，α为1.0时表示完全不透明而0.0表示完全透明，默认是1.0，当PopupWindow弹出时通过设置alpha在(0.0，1.0)之间设置灰色背景，当PopupWindow消失时恢复默认值。

private void setBackGroundLevel(float level) {    mWindow = ((Activity) context).getWindow();    WindowManager.LayoutParams params = mWindow.getAttributes();    params.alpha = level;    mWindow.setAttributes(params);    }

计算CommonPopupWindow 宽高：

//设置测量模式为UNSPECIFIED可以确保测量不受父View的影响int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);view.measure(w, h);//得到测量宽度int mWidth=view.getMeasuredWidth();//得到测量高度int mHeight=view.getMeasuredHeight();

注：在测量宽高时遇到一种情况，如图所示：

如果设置TextView 的 android:layout_width="wrap_content"，那么测量不出TextView 准确的height，当设置width为某个确定值时，也能得到准确的height了。

CommonPopupWindow 设置动画：

如设置向右动画：

.setAnimationStyle(R.style.AnimHorizontal);

在style.xml文件中设置：

<style name="AnimHorizontal" parent="@android:style/Animation">     <item name="android:windowEnterAnimation">@anim/push_scale_left_in</item>     <item name="android:windowExitAnimation">@anim/push_scale_left_out</item> </style>

android:windowEnterAnimation、android:windowExitAnimation分别为Popupwindow弹出和消失动画

进入动画为anim目录下的 push_scale_left_in.xml：

<scale xmlns:android="http://schemas.android.com/apk/res/android"    android:duration="200"    android:fromXScale="0.0"    android:fromYScale="1.0"    android:interpolator="@android:anim/accelerate_decelerate_interpolator"    android:toXScale="1.0"    android:toYScale="1.0" />

消失动画为 push_scale_left_out.xml：

<scale xmlns:android="http://schemas.android.com/apk/res/android"    android:duration="200"    android:fromXScale="1.0"    android:fromYScale="1.0"    android:interpolator="@android:anim/accelerate_decelerate_interpolator"    android:toXScale="0.0"    android:toYScale="1.0" />

CommonPopupWindow 弹出：

因为CommonPopupWindow继承自PopupWindow，所以可以直接使用PopupWindow中的弹出方法，常用的下面三种：

public void showAsDropDown(View anchor)public void showAsDropDown(View anchor, int xoff, int yoff)public void showAtLocation(View parent, int gravity, int x, int y)

其中，showAsDropDown是显示在参照物anchor的周围，xoff、yoff分别是X轴、Y轴的偏移量，如果不设置xoff、yoff，默认是显示在anchor的下方；showAtLocation是设置在父控件的位置，如设置Gravity.BOTTOM表示在父控件底部弹出，xoff、yoff也是X轴、Y轴的偏移量。

如上面向右弹出例子，分别使用showAsDropDown和showAtLocation来实现：

showAsDropDown：

popupWindow.showAsDropDown(view, view.getWidth(), -view.getHeight());

showAsDropDown默认展示在button的下面，通过改变X轴和Y轴的偏移量(X轴向右偏移button的宽度，Y轴向上偏移button的高度)，实现在Button右边弹出。

showAtLocation：

int[] positions = new int[2];view.getLocationOnScreen(positions);popupWindow.showAtLocation(findViewById(android.R.id.content),          Gravity.START| Gravity.TOP , positions[0] + view.getWidth(), positions[1]);

使用了View的getLocationOnScreen方法来获得View在屏幕中的坐标位置，传入的参数必须是一个有2个整数的数组，分别代表View的X、Y坐标，即是View的左上角的坐标，这里的View是Button，知道了Button左上角的坐标，就可以得到要展示的PopupWindow的左上角的坐标为(positions[0] + view.getWidth(), positions[1])，从而实现在Button右边弹出。

最后贴一下代码 CommonPopupWindow.java：

public class CommonPopupWindow extends PopupWindow { final PopupController controller; @Override public int getWidth() {     return controller.mPopupView.getMeasuredWidth(); } @Override public int getHeight() {     return controller.mPopupView.getMeasuredHeight(); } public interface ViewInterface {     void getChildView(View view, int layoutResId); } private CommonPopupWindow(Context context) {     controller = new PopupController(context, this); } @Override public void dismiss() {     super.dismiss();     controller.setBackGroundLevel(1.0f); } public static class Builder {     private final PopupController.PopupParams params;     private ViewInterface listener;     public Builder(Context context) {         params = new PopupController.PopupParams(context);     }     /**      * @param layoutResId 设置PopupWindow 布局ID      * @return Builder      */     public Builder setView(int layoutResId) {         params.mView = null;         params.layoutResId = layoutResId;         return this;     }     /**      * @param view 设置PopupWindow布局      * @return Builder      */     public Builder setView(View view) {         params.mView = view;         params.layoutResId = 0;         return this;     }     /**      * 设置子View      *      * @param listener ViewInterface      * @return Builder      */     public Builder setViewOnclickListener(ViewInterface listener) {         this.listener = listener;         return this;     }     /**      * 设置宽度和高度 如果不设置 默认是wrap_content      *      * @param width 宽      * @return Builder      */     public Builder setWidthAndHeight(int width, int height) {         params.mWidth = width;         params.mHeight = height;         return this;     }     /**      * 设置背景灰色程度      *      * @param level 0.0f-1.0f      * @return Builder      */     public Builder setBackGroundLevel(float level) {         params.isShowBg = true;         params.bg_level = level;         return this;     }     /**      * 是否可点击Outside消失      *      * @param touchable 是否可点击      * @return Builder      */     public Builder setOutsideTouchable(boolean touchable) {         params.isTouchable = touchable;         return this;     }     /**      * 设置动画      *      * @return Builder      */     public Builder setAnimationStyle(int animationStyle) {         params.isShowAnim = true;         params.animationStyle = animationStyle;         return this;     }     public CommonPopupWindow create() {         final CommonPopupWindow popupWindow = new CommonPopupWindow(params.mContext);         params.apply(popupWindow.controller);         if (listener != null && params.layoutResId != 0) {            listener.getChildView(popupWindow.controller.mPopupView, params.layoutResId);         }         CommonUtil.measureWidthAndHeight(popupWindow.controller.mPopupView);         return popupWindow;        }    }}

PopupController.java：

class PopupController {    private int layoutResId;//布局id    private Context context;    private PopupWindow popupWindow;    View mPopupView;//弹窗布局View    private View mView;    private Window mWindow;    PopupController(Context context, PopupWindow popupWindow) {        this.context = context;        this.popupWindow = popupWindow;    }    public void setView(int layoutResId) {        mView = null;        this.layoutResId = layoutResId;        installContent();    }    public void setView(View view) {        mView = view;        this.layoutResId = 0;        installContent();    }    private void installContent() {        if (layoutResId != 0) {            mPopupView = LayoutInflater.from(context).inflate(layoutResId, null);        } else if (mView != null) {            mPopupView = mView;        }        popupWindow.setContentView(mPopupView);    }    /**     * 设置宽度     *     * @param width  宽     * @param height 高     */    private void setWidthAndHeight(int width, int height) {        if (width == 0 || height == 0) {            //如果没设置宽高，默认是WRAP_CONTENT            popupWindow.setWidth(ViewGroup.LayoutParams.WRAP_CONTENT);            popupWindow.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);        } else {            popupWindow.setWidth(width);            popupWindow.setHeight(height);        }    }    /**     * 设置背景灰色程度     *     * @param level 0.0f-1.0f     */    void setBackGroundLevel(float level) {        mWindow = ((Activity) context).getWindow();        WindowManager.LayoutParams params = mWindow.getAttributes();        params.alpha = level;        mWindow.setAttributes(params);    }    /**     * 设置动画     */    private void setAnimationStyle(int animationStyle) {        popupWindow.setAnimationStyle(animationStyle);    }    /**     * 设置Outside是否可点击     *     * @param touchable 是否可点击     */    private void setOutsideTouchable(boolean touchable) {        popupWindow.setBackgroundDrawable(new ColorDrawable(0x00000000));//设置透明背景        popupWindow.setOutsideTouchable(touchable);//设置outside可点击        popupWindow.setFocusable(touchable);    }    static class PopupParams {        public int layoutResId;//布局id        public Context mContext;        public int mWidth, mHeight;//弹窗的宽和高        public boolean isShowBg, isShowAnim;        public float bg_level;//屏幕背景灰色程度        public int animationStyle;//动画Id        public View mView;        public boolean isTouchable = true;        public PopupParams(Context mContext) {            this.mContext = mContext;        }        public void apply(PopupController controller) {            if (mView != null) {                controller.setView(mView);            } else if (layoutResId != 0) {                controller.setView(layoutResId);            } else {                throw new IllegalArgumentException("PopupView's contentView is null");            }            controller.setWidthAndHeight(mWidth, mHeight);            controller.setOutsideTouchable(isTouchable);//设置outside可点击            if (isShowBg) {                //设置背景                controller.setBackGroundLevel(bg_level);            }            if (isShowAnim) {                controller.setAnimationStyle(animationStyle);            }        }    }}

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