android UI进阶之弹窗的使用（2）--实现通讯录的弹窗效果(3)

　　写一个ActionItem类，使得我们可以用一个ArrayList做容器，动态的添加这些actionitem。这些都是服务于第二个难点。

package com.notice.quickaction;import android.graphics.drawable.Drawable;import android.view.View.OnClickListener;/** * Action item, 每个item里面都有一个ImageView和一个TextView */public class ActionItem {    private Drawable        icon;    private String          title;    private OnClickListener listener;    /**     * 构造器     */    public ActionItem() {    }    /**     * 带Drawable参数的构造器     */    public ActionItem(Drawable icon) {        this.icon = icon;    }    /**     * 设置标题     */    public void setTitle(String title) {        this.title = title;    }    /**     * 获得标题     *      * @return action title     */    public String getTitle() {        return this.title;    }    /**     * 设置图标     */    public void setIcon(Drawable icon) {        this.icon = icon;    }    /**     * 获得图标     */    public Drawable getIcon() {        return this.icon;    }    /**     * 绑定监听器     */    public void setOnClickListener(OnClickListener listener) {        this.listener = listener;    }    /**     * 获得监听器     */    public OnClickListener getListener() {        return this.listener;    }}
　　接下来就是这个弹窗的实现了，我们继承PopupWindow类。在这个类中我们需要实现通过位置设置动画及弹出位置，并且给出一个方法供实现类调用，来动态添加item和设置动画效果。

代码如下：

package com.notice.quickaction;import java.util.ArrayList;import android.content.Context;import android.graphics.Rect;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.view.Gravity;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnTouchListener;import android.view.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.view.WindowManager;import android.view.animation.Animation;import android.view.animation.AnimationUtils;import android.view.animation.Interpolator;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.PopupWindow;import android.widget.TextView;/** * 继承弹窗，构造我们需要的弹窗 */public class QuickActions extends PopupWindow {    private final View            root;    private final ImageView       mArrowUp;    private final ImageView       mArrowDown;    private final Animation       mTrackAnim;    private final LayoutInflater  inflater;    private final Context         context;    protected final View          anchor;    protected final PopupWindow   window;    private Drawable              background            = null;    protected final WindowManager windowManager;    protected static final int    ANIM_GROW_FROM_LEFT   = 1;    protected static final int    ANIM_GROW_FROM_RIGHT  = 2;    protected static final int    ANIM_GROW_FROM_CENTER = 3;    protected static final int    ANIM_AUTO             = 4;    private int                   animStyle;    private boolean               animateTrack;    private ViewGroup             mTrack;    private ArrayList<ActionItem> actionList;    /**     * 构造器，在这里初始化一些内容     *      * @param anchor 像我之前博客所说的理解成一个基准 弹窗以此为基准弹出     */    public QuickActions(View anchor) {        super(anchor);        this.anchor = anchor;        this.window = new PopupWindow(anchor.getContext());        // 在popwindow外点击即关闭该window        window.setTouchInterceptor(new OnTouchListener() {            @Override            public boolean onTouch(View v, MotionEvent event) {                if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {                    QuickActions.this.window.dismiss();                    return true;                }                return false;            }        });        // 得到一个windowManager对象，用来得到窗口的一些属性        windowManager = (WindowManager) anchor.getContext().getSystemService(Context.WINDOW_SERVICE);        actionList = new ArrayList<ActionItem>();        context = anchor.getContext();        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);        // 装载布局，root即为弹出窗口的布局        root = (ViewGroup) inflater.inflate(R.layout.quickaction, null);        // 得到上下两个箭头        mArrowDown = (ImageView) root.findViewById(R.id.arrow_down);        mArrowUp = (ImageView) root.findViewById(R.id.arrow_up);        setContentView(root);        mTrackAnim = AnimationUtils.loadAnimation(anchor.getContext(), R.anim.rail);        // 设置动画的加速效果        mTrackAnim.setInterpolator(new Interpolator() {            public float getInterpolation(float t) {                final float inner = (t * 1.55f) - 1.1f;                return 1.2f - inner * inner;            }        });        // 这个是弹出窗口内的水平布局        mTrack = (ViewGroup) root.findViewById(R.id.tracks);        animStyle = ANIM_AUTO;// 设置动画风格        animateTrack = true;    }    /**     * 设置一个flag来标识动画显示     */    public void animateTrack(boolean animateTrack) {        this.animateTrack = animateTrack;    }    /**     * 设置动画风格     */    public void setAnimStyle(int animStyle) {        this.animStyle = animStyle;    }    /**     * 增加一个action     */    public void addActionItem(ActionItem action) {        actionList.add(action);    }    /**     * 弹出弹窗     */    public void show() {        // 预处理，设置window        preShow();        int[] location = new int[2];        // 得到anchor的位置        anchor.getLocationOnScreen(location);        // 以anchor的位置构造一个矩形        Rect anchorRect = new Rect(location[0], location[1], location[0] + anchor.getWidth(), location[1]                                                                                              + anchor.getHeight());        root.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));        root.measure(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);        int rootWidth = root.getMeasuredWidth();        int rootHeight = root.getMeasuredHeight();        // 得到屏幕的宽        int screenWidth = windowManager.getDefaultDisplay().getWidth();        // 设置弹窗弹出的位置的x/y        int xPos = (screenWidth - rootWidth) / 2;        int yPos = anchorRect.top - rootHeight;        boolean onTop = true;        // 在底部弹出        if (rootHeight > anchorRect.top) {            yPos = anchorRect.bottom;            onTop = false;        }        // 根据弹出位置，设置不同方向箭头图片        showArrow(((onTop) ? R.id.arrow_down : R.id.arrow_up), anchorRect.centerX());        // 设置弹出动画风格        setAnimationStyle(screenWidth, anchorRect.centerX(), onTop);        // 创建action list        createActionList();        // 在指定位置弹出弹窗        window.showAtLocation(this.anchor, Gravity.NO_GRAVITY, xPos, yPos);        // 设置弹窗内部的水平布局的动画        if (animateTrack) mTrack.startAnimation(mTrackAnim);    }    /**     * 预处理窗口     */    protected void preShow() {        if (root == null) {            throw new IllegalStateException("需要为弹窗设置布局");        }        // 背景是唯一能确定popupwindow宽高的元素，这里使用root的背景，但是需要给popupwindow设置一个空的BitmapDrawable        if (background == null) {            window.setBackgroundDrawable(new BitmapDrawable());        } else {            window.setBackgroundDrawable(background);        }        window.setWidth(WindowManager.LayoutParams.WRAP_CONTENT);        window.setHeight(WindowManager.LayoutParams.WRAP_CONTENT);        window.setTouchable(true);        window.setFocusable(true);        window.setOutsideTouchable(true);        // 指定布局        window.setContentView(root);    }    /**     * 设置动画风格     *      * @param screenWidth 屏幕宽底     * @param requestedX 距离屏幕左边的距离     * @param onTop 一个flag用来标识窗口的显示位置，如果为true则显示在anchor的顶部     */    private void setAnimationStyle(int screenWidth, int requestedX, boolean onTop) {        // 取得屏幕左边到箭头中心的位置        int arrowPos = requestedX - mArrowUp.getMeasuredWidth() / 2;        // 根据animStyle设置相应动画风格        switch (animStyle) {            case ANIM_GROW_FROM_LEFT:                window.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Left : R.style.Animations_PopDownMenu_Left);                break;            case ANIM_GROW_FROM_RIGHT:                window.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Right : R.style.Animations_PopDownMenu_Right);                break;            case ANIM_GROW_FROM_CENTER:                window.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Center : R.style.Animations_PopDownMenu_Center);                break;            case ANIM_AUTO:                if (arrowPos <= screenWidth / 4) {                    window.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Left : R.style.Animations_PopDownMenu_Left);                } else if (arrowPos > screenWidth / 4 && arrowPos < 3 * (screenWidth / 4)) {                    window.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Center : R.style.Animations_PopDownMenu_Center);                } else {                    window.setAnimationStyle((onTop) ? R.style.Animations_PopDownMenu_Right : R.style.Animations_PopDownMenu_Right);                }                break;        }    }    /**     * 创建action list     */    private void createActionList() {        View view;        String title;        Drawable icon;        OnClickListener listener;        int index = 1;        for (int i = 0; i < actionList.size(); i++) {            title = actionList.get(i).getTitle();            icon = actionList.get(i).getIcon();            listener = actionList.get(i).getListener();            // 得到action item            view = getActionItem(title, icon, listener);            view.setFocusable(true);            view.setClickable(true);            // 将其加入布局            mTrack.addView(view, index);            index++;        }    }    /**     * 获得 action item     *      * @param title action的标题     * @param icon action的图标     * @param listener action的点击事件监听器     * @return action的item     */    private View getActionItem(String title, Drawable icon, OnClickListener listener) {        // 装载action布局        LinearLayout container = (LinearLayout) inflater.inflate(R.layout.action_item, null);        ImageView img = (ImageView) container.findViewById(R.id.icon);        TextView text = (TextView) container.findViewById(R.id.title);        if (icon != null) {            img.setImageDrawable(icon);        } else {            img.setVisibility(View.GONE);        }        if (title != null) {            text.setText(title);        } else {            text.setVisibility(View.GONE);        }        if (listener != null) {            container.setOnClickListener(listener);        }        return container;    }    /**     * 显示箭头     *      * @param 箭头资源id     * @param 距离屏幕左边的距离     */    private void showArrow(int whichArrow, int requestedX) {        final View showArrow = (whichArrow == R.id.arrow_up) ? mArrowUp : mArrowDown;        final View hideArrow = (whichArrow == R.id.arrow_up) ? mArrowDown : mArrowUp;        final int arrowWidth = mArrowUp.getMeasuredWidth();        showArrow.setVisibility(View.VISIBLE);        ViewGroup.MarginLayoutParams param = (ViewGroup.MarginLayoutParams) showArrow.getLayoutParams();        // 以此设置距离左边的距离        param.leftMargin = requestedX - arrowWidth / 2;        hideArrow.setVisibility(View.INVISIBLE);    }}