实现通讯录的弹窗效果

参考http://www.cnblogs.com/noTice520/archive/2011/08/16/2140356.html

实现一个带动画的弹窗并不难，在我的之前一篇博客中有讲过弹窗PopupWindow的使用，不清楚弹窗的朋友可以去看下。在这里实现的难点主要有这些：

1.判断基准view在屏幕中的位置，从而确定弹窗弹出的位置以及动画。这是非常重要的一点，或许基准在屏幕上方，那么就要向下弹出。

2.动态的添加弹窗中的按钮，并实现点击

3.箭头位置的控制。箭头应该保持在基准的下方。

4.动画的匹配。里面有两种动画。一种是PopupWindow弹出动画，我们通过设置弹窗的style来实现（style的用法可以参考我之前的博客）。另一种是弹窗中间的布局的动画。

　　了解了难点以后，写起来就方便了。

首先实现弹窗的布局：
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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
       
     <FrameLayout
          android:layout_marginTop="10dip"
        android:id="@+id/header2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/quickcontact_top_frame"/>
       
      <ImageView
        android:id="@+id/arrow_up"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"   
        android:src="@drawable/quickcontact_arrow_up" />
      
    <HorizontalScrollView
        android:id="@+id/scroll"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:fadingEdgeLength="0dip"
        android:layout_below="@id/header2"
        android:background="@drawable/quickcontact_slider_background"
        android:scrollbars="none">

        <LinearLayout
            android:id="@+id/tracks"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingTop="4dip"
            android:paddingBottom="4dip"
            android:orientation="horizontal">
       
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/quickcontact_slider_grip_left" />

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/quickcontact_slider_grip_right" />
               
        </LinearLayout>
           
    </HorizontalScrollView>

    <FrameLayout
        android:id="@+id/footer"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/scroll"
        android:background="@drawable/quickcontact_bottom_frame" />

    <ImageView
        android:id="@+id/arrow_down"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="-1dip"
        android:layout_below="@id/footer"
        android:src="@drawable/quickcontact_arrow_down" />

</RelativeLayout>

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　　窗体内部使用一个HorizontalScrollView可以实现一个滑动效果。我们可以动态的在这个布局中添加按钮，我们称作Actionitem。

　　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。
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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;
    }
}

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　　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：
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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);
    }

}

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　　有点长，不过注释都写的很清楚了。show()方法完成窗口的弹出。里面调用其他方法设置了窗口弹出的位置，设置了相应的动画弹出风格和箭头朝向以及位置，创建了action item。大家可以从这个方法里开始看，看每个的实现。

　　最后写个测试类。放一个Button在屏幕顶部，一个在屏幕底部。点击弹出弹窗。
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package com.notice.quickaction;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

/**
* 实现activity
*/
public class MyQuick extends Activity {

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

        setContentView(R.layout.main);

        // 得到一个actionItem对象
        final ActionItem chart = new ActionItem();

        // 设置标题，图标，点击事件
        chart.setTitle("Chart");
        chart.setIcon(getResources().getDrawable(R.drawable.chart));
        chart.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(MyQuick.this, "Chart selected", Toast.LENGTH_SHORT).show();
            }
        });

        final ActionItem production = new ActionItem();

        production.setTitle("Products");
        production.setIcon(getResources().getDrawable(R.drawable.production));
        production.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(MyQuick.this, "Products selected", Toast.LENGTH_SHORT).show();
            }
        });

        Button btn1 = (Button) this.findViewById(R.id.btn1);
        // 点击按钮弹出
        btn1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // 初始化一个QuickActions
                QuickActions qa = new QuickActions(v);
                // 为他添加actionitem
                qa.addActionItem(chart);
                qa.addActionItem(production);
                qa.addActionItem(production);
                qa.addActionItem(production);
                // 设置动画风格
                qa.setAnimStyle(QuickActions.ANIM_AUTO);

                qa.show();
            }
        });

        final ActionItem dashboard = new ActionItem();

        dashboard.setIcon(getResources().getDrawable(R.drawable.dashboard));
        dashboard.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(MyQuick.this, "dashboard selected", Toast.LENGTH_SHORT).show();
            }
        });

        final ActionItem users = new ActionItem();

        users.setIcon(getResources().getDrawable(R.drawable.users));
        users.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(MyQuick.this, "Products selected", Toast.LENGTH_SHORT).show();
            }
        });

        Button btn2 = (Button) this.findViewById(R.id.btn2);
        btn2.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                QuickActions qa = new QuickActions(v);

                qa.addActionItem(dashboard);
                qa.addActionItem(users);
                qa.setAnimStyle(QuickActions.ANIM_GROW_FROM_CENTER);

                qa.show();
            }
        });
    }
}

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　　再讲下PopupWindow的风格的实现。其中一个风格代码如下：

    <style name="Animations.PopDownMenu.Left">
        <item name="@android:windowEnterAnimation">@anim/grow_from_topleft_to_bottomright</item>
        <item name="@android:windowExitAnimation">@anim/shrink_from_bottomright_to_topleft</item>
    </style>

　　写两个item，分别实现弹出和消失动画。因为篇幅有限（好像已经很长了。。。），就不全部贴出来了。动画都是一个scale加一个alpha，对动画不熟悉的朋友可以自己研究下，从底部弹出的动画文件grow_from_bottom.xml：
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<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <scale
        android:fromXScale="0.3" android:toXScale="1.0"
        android:fromYScale="0.3" android:toYScale="1.0"
        android:pivotX="50%" android:pivotY="100%"
        android:duration="@android:integer/config_shortAnimTime"
    />
    <alpha
        android:interpolator="@android:anim/decelerate_interpolator"
        android:fromAlpha="0.0" android:toAlpha="1.0"
        android:duration="@android:integer/config_shortAnimTime"
    />
</set>

复制代码实现一个带动画的弹窗并不难，在我的之前一篇博客中有讲过弹窗PopupWindow的使用，不清楚弹窗的朋友可以去看下。在这里实现的难点主要有这些：

1.判断基准view在屏幕中的位置，从而确定弹窗弹出的位置以及动画。这是非常重要的一点，或许基准在屏幕上方，那么就要向下弹出。

2.动态的添加弹窗中的按钮，并实现点击

3.箭头位置的控制。箭头应该保持在基准的下方。

4.动画的匹配。里面有两种动画。一种是PopupWindow弹出动画，我们通过设置弹窗的style来实现（style的用法可以参考我之前的博客）。另一种是弹窗中间的布局的动画。

　　了解了难点以后，写起来就方便了。

首先实现弹窗的布局：
复制代码

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
       
     <FrameLayout
          android:layout_marginTop="10dip"
        android:id="@+id/header2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/quickcontact_top_frame"/>
       
      <ImageView
        android:id="@+id/arrow_up"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"   
        android:src="@drawable/quickcontact_arrow_up" />
      
    <HorizontalScrollView
        android:id="@+id/scroll"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:fadingEdgeLength="0dip"
        android:layout_below="@id/header2"
        android:background="@drawable/quickcontact_slider_background"
        android:scrollbars="none">

        <LinearLayout
            android:id="@+id/tracks"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingTop="4dip"
            android:paddingBottom="4dip"
            android:orientation="horizontal">
       
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/quickcontact_slider_grip_left" />

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/quickcontact_slider_grip_right" />
               
        </LinearLayout>
           
    </HorizontalScrollView>

    <FrameLayout
        android:id="@+id/footer"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/scroll"
        android:background="@drawable/quickcontact_bottom_frame" />

    <ImageView
        android:id="@+id/arrow_down"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="-1dip"
        android:layout_below="@id/footer"
        android:src="@drawable/quickcontact_arrow_down" />

</RelativeLayout>

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　　窗体内部使用一个HorizontalScrollView可以实现一个滑动效果。我们可以动态的在这个布局中添加按钮，我们称作Actionitem。

　　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。
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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;
    }
}

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　　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：
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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);
    }

}

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　　有点长，不过注释都写的很清楚了。show()方法完成窗口的弹出。里面调用其他方法设置了窗口弹出的位置，设置了相应的动画弹出风格和箭头朝向以及位置，创建了action item。大家可以从这个方法里开始看，看每个的实现。

　　最后写个测试类。放一个Button在屏幕顶部，一个在屏幕底部。点击弹出弹窗。
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package com.notice.quickaction;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

/**
* 实现activity
*/
public class MyQuick extends Activity {

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

        setContentView(R.layout.main);

        // 得到一个actionItem对象
        final ActionItem chart = new ActionItem();

        // 设置标题，图标，点击事件
        chart.setTitle("Chart");
        chart.setIcon(getResources().getDrawable(R.drawable.chart));
        chart.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(MyQuick.this, "Chart selected", Toast.LENGTH_SHORT).show();
            }
        });

        final ActionItem production = new ActionItem();

        production.setTitle("Products");
        production.setIcon(getResources().getDrawable(R.drawable.production));
        production.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(MyQuick.this, "Products selected", Toast.LENGTH_SHORT).show();
            }
        });

        Button btn1 = (Button) this.findViewById(R.id.btn1);
        // 点击按钮弹出
        btn1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // 初始化一个QuickActions
                QuickActions qa = new QuickActions(v);
                // 为他添加actionitem
                qa.addActionItem(chart);
                qa.addActionItem(production);
                qa.addActionItem(production);
                qa.addActionItem(production);
                // 设置动画风格
                qa.setAnimStyle(QuickActions.ANIM_AUTO);

                qa.show();
            }
        });

        final ActionItem dashboard = new ActionItem();

        dashboard.setIcon(getResources().getDrawable(R.drawable.dashboard));
        dashboard.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(MyQuick.this, "dashboard selected", Toast.LENGTH_SHORT).show();
            }
        });

        final ActionItem users = new ActionItem();

        users.setIcon(getResources().getDrawable(R.drawable.users));
        users.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(MyQuick.this, "Products selected", Toast.LENGTH_SHORT).show();
            }
        });

        Button btn2 = (Button) this.findViewById(R.id.btn2);
        btn2.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                QuickActions qa = new QuickActions(v);

                qa.addActionItem(dashboard);
                qa.addActionItem(users);
                qa.setAnimStyle(QuickActions.ANIM_GROW_FROM_CENTER);

                qa.show();
            }
        });
    }
}

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　　再讲下PopupWindow的风格的实现。其中一个风格代码如下：

    <style name="Animations.PopDownMenu.Left">
        <item name="@android:windowEnterAnimation">@anim/grow_from_topleft_to_bottomright</item>
        <item name="@android:windowExitAnimation">@anim/shrink_from_bottomright_to_topleft</item>
    </style>

　　写两个item，分别实现弹出和消失动画。因为篇幅有限（好像已经很长了。。。），就不全部贴出来了。动画都是一个scale加一个alpha，对动画不熟悉的朋友可以自己研究下，从底部弹出的动画文件grow_from_bottom.xml：
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<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <scale
        android:fromXScale="0.3" android:toXScale="1.0"
        android:fromYScale="0.3" android:toYScale="1.0"
        android:pivotX="50%" android:pivotY="100%"
        android:duration="@android:integer/config_shortAnimTime"
    />
    <alpha
        android:interpolator="@android:anim/decelerate_interpolator"
        android:fromAlpha="0.0" android:toAlpha="1.0"
        android:duration="@android:integer/config_shortAnimTime"
    />
</set>

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