完美定义popwindow

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1.上类图

这里写图片描述

2.上效果图

这里写图片描述

3.实现思路

为了，便于调试、解耦、代码结构清晰。首先先到的就是进行封装处理。同时便于日后其他项目复用。不进行重复造轮子。

4.功能介绍

4.1 根据popwindow的显示隐藏进行回调小三角的style（向上，向下）。
4.2 监听item点击，进行状态选择切换。
4.3 进行选中态默认，当前选择的是第几个item，popwindow弹出来。默认选中第几个 item。
4.4 根据屏幕的宽度，设置popwindow 位置居中向上偏移一些。
4.5 给popwindow弹出动画

5.核心代码分析

package com.nuoyuan.sp2p.widget.home;import android.content.Context;import android.graphics.drawable.BitmapDrawable;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.widget.LinearLayout;import android.widget.PopupWindow;import com.nuoyuan.sp2p.R;import com.nuoyuan.sp2p.activity.info.ProductionListActivity;import com.nuoyuan.sp2p.util.LogUtil;import java.util.ArrayList;/** * Created by weichyang on 2016/6/15. */public class VPopWindow extends PopupWindow {    private Context context;    /**     * 展示列表     */    private ArrayList<String> titles;    /**     * 依附于view     */    private View anchorView;    private PopUpwindowLayout popUpwindowLayout;    private View contentView;    /**     * 构造方式     *     * @param context     * @param anchorView     */    public VPopWindow(Context context, View anchorView, ArrayList<String> titles) {        super(context, null);        this.titles = titles;        this.context = context;        this.anchorView = anchorView;        initPopWindowParameter();    }    private void initPopWindowParameter() {        contentView = LayoutInflater.from(context).inflate(R.layout.layout_popupwindow, null);        this.setContentView(contentView);        this.setWidth(LinearLayout.LayoutParams.WRAP_CONTENT);        this.setHeight(LinearLayout.LayoutParams.WRAP_CONTENT);        this.setFocusable(true);        popUpwindowLayout = (PopUpwindowLayout) contentView.findViewById(R.id.llayout_popupwindow);        popUpwindowLayout.initViews(context, titles);        contentView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);        // 允许点击外部消失        this.setBackgroundDrawable(new BitmapDrawable());        this.setOutsideTouchable(true);        this.setAnimationStyle(R.style.popwindow_anim_style);    }    /**     * 设置显示位置     *     * @param anchorView     */    public void showVpAsDropDown(View anchorView) {        this.showAsDropDown(anchorView);    }    /**     * 显示偏移量     *     * @param anchorView     * @param x     * @param y     */    public void showVpAsDropDown(View anchorView, int x, int y) {        int[] location = new int[2];        anchorView.getLocationOnScreen(location);        this.showAsDropDown(anchorView, x, y);    }    /**     * 设置点击监听     *     * @param onItemClick     */    public void setOnItemClick(PopUpwindowLayout.OnClickCallback onItemClick) {        if (popUpwindowLayout == null) {            popUpwindowLayout = (PopUpwindowLayout) contentView.findViewById(R.id.llayout_popupwindow);        }        popUpwindowLayout.setClickListener(onItemClick);    }    /**     * 设置默认选中项     *     * @param index     */    public void itemSelected(int index) {        if (popUpwindowLayout != null) {            popUpwindowLayout.setSelectedIndex(index);        } else {            LogUtil.e("popUpWindowLayout is null");        }    }}

// item 类。主要对的item的点击事件进行设置。提供外部访问的接口，选中状态设置的。这里使用代码，没有使用xml shape文件形式。更灵活

package com.nuoyuan.sp2p.widget.home;import android.content.Context;import android.content.res.ColorStateList;import android.text.TextUtils;import android.util.AttributeSet;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.LinearLayout;import android.widget.TextView;import com.nuoyuan.sp2p.R;import com.nuoyuan.sp2p.util.DensityUtil;import com.nuoyuan.sp2p.util.DeviceUtil;import com.nuoyuan.sp2p.util.StringUtil;import java.util.ArrayList;import java.util.List;/** * Created by weichyang on 2016/6/14. * 弹窗view */public class PopUpwindowLayout extends LinearLayout {    private Context mContext;    private OnClickCallback mCallback;    private List<TextView> txtViewList;    public PopUpwindowLayout(Context context) {        this(context, null);    }    public PopUpwindowLayout(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public PopUpwindowLayout(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        setOrientation(VERTICAL);        setBackgroundResource(R.drawable.bmap_bg);        init();    }    private void init() {        txtViewList = new ArrayList<>();    }    /**     * 设置标题内容     *     * @param context     * @param titles  标题文字内容     */    public void initViews(Context context, List<String> titles) {        initViews(context, titles, false);    }    /**     * 设置标题内容     *     * @param context     * @param titles  标题文字内容     * @param hasDraw 是否带右侧向下箭头     */    public void initViews(Context context, List<String> titles, boolean hasDraw) {        this.mContext = context;        setLayoutContent(mContext, titles, hasDraw);    }    /**     * 设置条目点击监听     */    public void setClickListener(OnClickCallback callback) {        this.mCallback = callback;    }    /**     * 设置内容     *     * @param context     * @param titles     * @param hasDraw     */    private void setLayoutContent(Context context, final List<String> titles, boolean hasDraw) {        removeAllViews();        if (titles != null && titles.size() > 0) {            // 不带箭头            if (!hasDraw) {                for (int i = 0; i < titles.size(); i++) {                    final int index = i;                    final TextView textView = new TextView(context);                    // 文本                    textView.setText(titles.get(i));                    // 颜色                    float titleSize = getContext().getResources().getDimension(R.dimen.sp_18);                    // 字体                    textView.setTextSize(DensityUtil.px2dip(context, titleSize));                    textView.setGravity(Gravity.CENTER);                    textView.setPadding(20, 0, 20, 0);                    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(                            LayoutParams.MATCH_PARENT, DeviceUtil.dip2px(context, 35), Gravity.CENTER);                    params.gravity = Gravity.CENTER;                    textView.setLayoutParams(params);                    textView.setTextColor(createColorStateList(0xffffffff, 0xffC0A78A, 0xffffffff, 0xffffffff));                    textView.setBackgroundDrawable(getResources().getDrawable(R.drawable.investment_pop_selector));                    addView(textView);                    // addDividingLine(context, titles, i);                    textView.setOnClickListener(new View.OnClickListener() {                        @Override                        public void onClick(View v) {                            if (mCallback != null) {                                mCallback.onItemClick(PopUpwindowLayout.this, titles.size(), index);                            }                        }                    });                    // TODO: 2016/6/22 避免重复添加                    if (i == 0) {                        txtViewList.clear();                        txtViewList.add(textView);                    } else {                        txtViewList.add(textView);                    }                }            }        } else {            throw new RuntimeException("title counts is less than 0");        }    }    /**     * 增加中间分割线     *     * @param context     * @param titles     * @param i     */    private void addDividingLine(Context context, List<String> titles, int i) {        if (i < titles.size() - 1) {            LayoutParams layoutParams = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 1);            layoutParams.gravity = Gravity.CENTER_VERTICAL;            View view = new View(context);            view.setLayoutParams(layoutParams);            view.setBackgroundResource(R.color.gray_9);            addView(view);        }    }    /**     * http://blog.csdn.net/abc6368765/article/details/51482317     *     * @param normal     * @param pressed     * @param focused     * @param unable     * @return     */    private ColorStateList createColorStateList(int normal, int pressed, int focused, int unable) {        int[] colors = new int[]{pressed, focused, normal, focused, unable, normal};        int[][] states = new int[6][];        states[0] = new int[]{android.R.attr.state_pressed, android.R.attr.state_enabled};        states[1] = new int[]{android.R.attr.state_enabled, android.R.attr.state_focused};        states[2] = new int[]{android.R.attr.state_enabled};        states[3] = new int[]{android.R.attr.state_focused};        states[4] = new int[]{android.R.attr.state_window_focused};        states[5] = new int[]{};        ColorStateList colorList = new ColorStateList(states, colors);        return colorList;    }    /**     * 点击事件接口     */    public interface OnClickCallback {        /**         * 点击子视图时调用         *         * @param parentView 当前操作的View视图         * @param size       当前视图中子视图数量         * @param index      当前点击子视图索引         */        void onItemClick(LinearLayout parentView, int size, int index);    }    /**     * 选中     *     * @param index     */    public void setSelectedIndex(int index) {        if (!txtViewList.isEmpty())            for (int i = 0; i < txtViewList.size(); i++) {                if (i == index) {                    txtViewList.get(i).setPressed(true);                } else {                    txtViewList.get(i).setPressed(false);                }            }    }}

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