Android-PickerView系列之封装篇（三）

注：此文交由跟我一起维护Android-PickerView 项目的伙伴totcw写的，友情链接：http://blog.csdn.net/totcw

一、概述

这是Android-pickerview系列的第三篇文章，主要是讲解一下时间选择器TimePickerView是如何封装的，关于怎么使用这个控件的可以查看Android-PickerView系列之介绍与使用篇（一），想要研究WheelView原理的话可以看这篇Android-PickerView系列之源码解析篇（二）。

二、封装

                    这是一张类的关系图

构造函数使用的Builder设计模式来封装的，通过builder来设置参数，最重要的就是initview（）方法。源码如下:

 public TimePickerView(Builder builder) {        super(builder.context);        this.timeSelectListener = builder.timeSelectListener;        this.gravity = builder.gravity;        this.type = builder.type;        this.Str_Submit = builder.Str_Submit;        this.Str_Cancel = builder.Str_Cancel;        this.Str_Title = builder.Str_Title;        this.Color_Submit = builder.Color_Submit;        this.Color_Cancel = builder.Color_Cancel;        this.Color_Title = builder.Color_Title;        this.Color_Background_Wheel = builder.Color_Background_Wheel;        this.Color_Background_Title = builder.Color_Background_Title;        this.Size_Submit_Cancel = builder.Size_Submit_Cancel;        this.Size_Title = builder.Size_Title;        this.Size_Content = builder.Size_Content;        this.startYear = builder.startYear;        this.endYear = builder.endYear;        this.date = builder.date;        this.cyclic = builder.cyclic;        this.cancelable = builder.cancelable;        this.label_year = builder.label_year;        this.label_month = builder.label_month;        this.label_day = builder.label_day;        this.label_hours = builder.label_hours;        this.label_mins = builder.label_mins;        this.label_seconds = builder.label_seconds;        this.textColorCenter = builder.textColorCenter;        this.textColorOut = builder.textColorOut;        this.dividerColor = builder.dividerColor;        this.lineSpacingMultiplier = builder.lineSpacingMultiplier;        this.isDialog = builder.isDialog;        initView(builder.context);    }
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initView（）的源码如下:

void initView(Context context) {        initViews();        init();        initEvents();      LayoutInflater.from(context).inflate(R.layout.pickerview_time, contentContainer);        //顶部标题        tvTitle = (TextView) findViewById(R.id.tvTitle);        //确定和取消按钮        btnSubmit = (Button) findViewById(R.id.btnSubmit);        btnCancel = (Button) findViewById(R.id.btnCancel);        btnSubmit.setTag(TAG_SUBMIT);        btnCancel.setTag(TAG_CANCEL);        btnSubmit.setOnClickListener(this);        btnCancel.setOnClickListener(this);        //设置文字        btnSubmit.setText(TextUtils.isEmpty(Str_Submit)?context.getResources().getString(R.string.pickerview_submit):Str_Submit);        btnCancel.setText(TextUtils.isEmpty(Str_Cancel)?context.getResources().getString(R.string.pickerview_cancel):Str_Cancel);        tvTitle.setText(TextUtils.isEmpty(Str_Title)?"":Str_Title);//默认为空        //设置文字颜色        btnSubmit.setTextColor(Color_Submit==0?pickerview_timebtn_nor:Color_Submit);        btnCancel.setTextColor(Color_Cancel==0?pickerview_timebtn_nor:Color_Cancel);        tvTitle.setTextColor(Color_Title==0?pickerview_topbar_title:Color_Title);        //设置文字大小        btnSubmit.setTextSize(Size_Submit_Cancel);        btnCancel.setTextSize(Size_Submit_Cancel);        tvTitle.setTextSize(Size_Title);        // 时间转轮 自定义控件,xml下面给出        LinearLayout timePickerView = (LinearLayout) findViewById(R.id.timepicker);        RelativeLayout rv_top_bar = (RelativeLayout) findViewById(R.id.rv_topbar);        //设置标题颜色        rv_top_bar.setBackgroundColor(Color_Background_Title==0?pickerview_bg_topbar:Color_Background_Title);      //设置滚轮背景颜色  timePickerView.setBackgroundColor(Color_Background_Wheel==0?bgColor_default:Color_Background_Wheel);        wheelTime = new WheelTime(timePickerView, type, gravity,Size_Content);        if (startYear!=0&&endYear!=0&&startYear<=endYear){            //设置年的起始范围            setRange();        }        //设置一开始的选中时间        setTime();//设置单位        wheelTime.setLabels(label_year,label_month,label_day,label_hours,label_mins,label_seconds);        //设置是否可以点击外部关闭界面        setOutSideCancelable(cancelable);        //设置是否循环滚动        wheelTime.setCyclic(cyclic);        //设置分隔线的颜色        wheelTime.setDividerColor(dividerColor);        //设置行距的大小        wheelTime.setLineSpacingMultiplier(lineSpacingMultiplier);        //设置文字颜色        wheelTime.setTextColorOut(textColorOut);        wheelTime.setTextColorCenter(textColorCenter);    }
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R.id.timepicker 时间选择器的xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="vertical">    <include        layout="@layout/include_pickerview_topbar"        android:layout_width="match_parent"        android:layout_height="@dimen/pickerview_topbar_height" />    <LinearLayout        android:id="@+id/timepicker"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:background="@android:color/white"        android:orientation="horizontal">        <com.bigkoo.pickerview.lib.WheelView            android:id="@+id/year"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1" />        <com.bigkoo.pickerview.lib.WheelView            android:id="@+id/month"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1.1" />        <com.bigkoo.pickerview.lib.WheelView            android:id="@+id/day"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1.1" />        <com.bigkoo.pickerview.lib.WheelView            android:id="@+id/hour"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1.1" />        <com.bigkoo.pickerview.lib.WheelView            android:id="@+id/min"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1.1" />        <com.bigkoo.pickerview.lib.WheelView            android:id="@+id/second"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1.1" />    </LinearLayout></LinearLayout>
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这个方法就真正负责加载View的方法，首先调用initViews（），intViews方法会根据builder中的isDialog参数来判断是要显示成对话框模式还是显示在屏幕的下边。源码如下：

protected void initViews() {        LayoutInflater layoutInflater = LayoutInflater.from(context);        if (isDialog()) {            //如果是对话框模式            //这个是控件的布局,xml的源码在下面会贴出来            dialogView = (ViewGroup) layoutInflater.inflate(R.layout.layout_basepickerview, null, false);            //设置界面的背景为透明            dialogView.setBackgroundColor(Color.TRANSPARENT);            //这个是真正要加载时间选取器的父布局            contentContainer = (ViewGroup) dialogView.findViewById(R.id.content_container);            //设置对话框 左右间距屏幕30            this.params.leftMargin = 30;            this.params.rightMargin = 30;            contentContainer.setLayoutParams(this.params);            //创建对话框,将dialogView设置成dialog要显示的view              if (dialogView != null) {            mDialog = new Dialog(context, R.style.custom_dialog2);            mDialog.setCancelable(true);//不能点外面取消,也不 能点back取消            mDialog.setContentView(dialogView);        }            //给背景设置点击事件,这样当点击内容以外的地方会关闭界面            dialogView.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    dismiss();                }            });        } else {            //如果只是要显示在屏幕的下方            //decorView是activity的根View            decorView = (ViewGroup) ((Activity) context).getWindow().getDecorView().findViewById(android.R.id.content);            //将控件添加到decorView中            rootView = (ViewGroup) layoutInflater.inflate(R.layout.layout_basepickerview, decorView, false);            rootView.setLayoutParams(new FrameLayout.LayoutParams(                    ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT            ));            //这个是真正要加载时间选取器的父布局            contentContainer = (ViewGroup) rootView.findViewById(R.id.content_container);            contentContainer.setLayoutParams(params);        }    }
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R.layout.layout_basepickerview的xml文件源码如下：

<?xml version="1.0" encoding="utf-8"?><FrameLayout    android:id="@+id/outmost_container"    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:clickable="true"    android:background="@color/bgColor_overlay">    <FrameLayout        android:id="@+id/content_container"        android:layout_width="wrap_content"        android:layout_height="wrap_content">    </FrameLayout></FrameLayout>
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然后调用init（）方法加载动画。然后通过LayoutInflater.inflate（）方法将时间选择器的布局加载到要显示的布局contentContainer中。最后通过wheelTime 类来初始化时间选择器.在调用wheeltime的setPicker来初始化滚轮的数据.
接下来看看WheelTime的构造方法:

   public WheelTime(View view, Type type, int gravity, int textSize) {        super();        this.view = view;//这个view就是时间选择器的布局也就R.id.timepicker        this.type = type;//表示要显示模式,例如:年月日时分秒,年月日        this.gravity = gravity; 滚轮文字的显示位置 默认居中        this.textSize = textSize;//这个表示滚轮文字的大小    }
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构造方法其实就只是给对应的属性赋值,通过调用setPicker方法来给wheelview设置数据,下面就看下它的源码:

 public void setPicker(int year, int month, int day, int h, int m, int s) {        // 添加大小月月份并将其转换为list,方便之后的判断        String[] months_big = {"1", "3", "5", "7", "8", "10", "12"};        String[] months_little = {"4", "6", "9", "11"};        final List<String> list_big = Arrays.asList(months_big);        final List<String> list_little = Arrays.asList(months_little);        Context context = view.getContext();        // 年 这view就是R.layout.timepicker布局        wv_year = (WheelView) view.findViewById(R.id.year);        wv_year.setAdapter(new NumericWheelAdapter(startYear, endYear));// 设置"年"的显示数据        wv_year.setLabel(context.getString(R.string.pickerview_year));// 添加文字        wv_year.setCurrentItem(year - startYear);// 初始化时显示的数据        wv_year.setGravity(gravity);        // 月        wv_month = (WheelView) view.findViewById(R.id.month);        wv_month.setAdapter(new NumericWheelAdapter(1, 12));        wv_month.setLabel(context.getString(R.string.pickerview_month));        wv_month.setCurrentItem(month);        wv_month.setGravity(gravity);        // 日        wv_day = (WheelView) view.findViewById(R.id.day);        // 判断大小月及是否闰年,用来确定"日"的数据        if (list_big.contains(String.valueOf(month + 1))) {            wv_day.setAdapter(new NumericWheelAdapter(1, 31));        } else if (list_little.contains(String.valueOf(month + 1))) {            wv_day.setAdapter(new NumericWheelAdapter(1, 30));        } else {            // 闰年            if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)                wv_day.setAdapter(new NumericWheelAdapter(1, 29));            else                wv_day.setAdapter(new NumericWheelAdapter(1, 28));        }        wv_day.setLabel(context.getString(R.string.pickerview_day));        wv_day.setCurrentItem(day - 1);        wv_day.setGravity(gravity);        //时        wv_hours = (WheelView) view.findViewById(R.id.hour);        wv_hours.setAdapter(new NumericWheelAdapter(0, 23));        wv_hours.setLabel(context.getString(R.string.pickerview_hours));// 添加文字        wv_hours.setCurrentItem(h);        wv_hours.setGravity(gravity);        //分        wv_mins = (WheelView) view.findViewById(R.id.min);        wv_mins.setAdapter(new NumericWheelAdapter(0, 59));        wv_mins.setLabel(context.getString(R.string.pickerview_minutes));// 添加文字        wv_mins.setCurrentItem(m);        wv_mins.setGravity(gravity);        //秒        wv_seconds = (WheelView) view.findViewById(R.id.second);        wv_seconds.setAdapter(new NumericWheelAdapter(0, 59));        wv_seconds.setLabel(context.getString(R.string.pickerview_seconds));// 添加文字        wv_seconds.setCurrentItem(s);        wv_seconds.setGravity(gravity);        // 添加"年"监听        OnItemSelectedListener wheelListener_year = new OnItemSelectedListener() {            @Override            public void onItemSelected(int index) {                int year_num = index + startYear;                // 判断大小月及是否闰年,用来确定"日"的数据                int maxItem ;                if (list_big                        .contains(String.valueOf(wv_month.getCurrentItem() + 1))) {                    wv_day.setAdapter(new NumericWheelAdapter(1, 31));                    maxItem = 31;                } else if (list_little.contains(String.valueOf(wv_month                        .getCurrentItem() + 1))) {                    wv_day.setAdapter(new NumericWheelAdapter(1, 30));                    maxItem = 30;                } else {                    if ((year_num % 4 == 0 && year_num % 100 != 0)                            || year_num % 400 == 0) {                        wv_day.setAdapter(new NumericWheelAdapter(1, 29));                        maxItem = 29;                    } else {                        wv_day.setAdapter(new NumericWheelAdapter(1, 28));                        maxItem = 28;                    }                }                if (wv_day.getCurrentItem() > maxItem - 1) {                    wv_day.setCurrentItem(maxItem - 1);                }            }        };        // 添加"月"监听        OnItemSelectedListener wheelListener_month = new OnItemSelectedListener() {            @Override            public void onItemSelected(int index) {                int month_num = index + 1;                int maxItem = 30;                // 判断大小月及是否闰年,用来确定"日"的数据                if (list_big.contains(String.valueOf(month_num))) {                    wv_day.setAdapter(new NumericWheelAdapter(1, 31));                    maxItem = 31;                } else if (list_little.contains(String.valueOf(month_num))) {                    wv_day.setAdapter(new NumericWheelAdapter(1, 30));                    maxItem = 30;                } else {                    if (((wv_year.getCurrentItem() + startYear) % 4 == 0 && (wv_year                            .getCurrentItem() + startYear) % 100 != 0)                            || (wv_year.getCurrentItem() + startYear) % 400 == 0) {                        wv_day.setAdapter(new NumericWheelAdapter(1, 29));                        maxItem = 29;                    } else {                        wv_day.setAdapter(new NumericWheelAdapter(1, 28));                        maxItem = 28;                    }                }                if (wv_day.getCurrentItem() > maxItem - 1) {                    wv_day.setCurrentItem(maxItem - 1);                }            }        };        wv_year.setOnItemSelectedListener(wheelListener_year);        wv_month.setOnItemSelectedListener(wheelListener_month);        //根据type 来显示特定的模式        switch (type) {            case ALL:               /* textSize = textSize * 3;*/                break;            case YEAR_MONTH_DAY:               /* textSize = textSize * 4;*/                wv_hours.setVisibility(View.GONE);                wv_mins.setVisibility(View.GONE);                wv_seconds.setVisibility(View.GONE);                break;            case HOURS_MINS:                /*textSize = textSize * 4;*/                wv_year.setVisibility(View.GONE);                wv_month.setVisibility(View.GONE);                wv_day.setVisibility(View.GONE);                wv_seconds.setVisibility(View.GONE);                break;            case MONTH_DAY_HOUR_MIN:               /* textSize = textSize * 3;*/                wv_year.setVisibility(View.GONE);                wv_seconds.setVisibility(View.GONE);                break;            case YEAR_MONTH:               /* textSize = textSize * 4;*/                wv_day.setVisibility(View.GONE);                wv_hours.setVisibility(View.GONE);                wv_mins.setVisibility(View.GONE);                wv_seconds.setVisibility(View.GONE);        }        //设置文字的大小        setContentTextSize();    }
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setContentTextSize()设置文字的大小,源码很简单了就调用wheelview提供的设置文字大小的方法就可以了,源码如下:

private void setContentTextSize() {        //分别设置年,月,日,时,分,秒的文字大小        wv_day.setTextSize(textSize);        wv_month.setTextSize(textSize);        wv_year.setTextSize(textSize);        wv_hours.setTextSize(textSize);        wv_mins.setTextSize(textSize);        wv_seconds.setTextSize(textSize);    }
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再来看看显示TimePickerView的代码,也就是show方法,源码如下:

   public void show() {        //首先判断是不是对话框模式        if (isDialog()) {        //如果是对话框模式就直接调用对话框的show方法即可             if (mDialog != null) {            mDialog.show();        }        } else {          //如果不是对话框模式,先判断有没有显示            if (isShowing()) {                return;            }            isShowing = true;            //将时间选择器的布局添加到activity的根view上            onAttached(rootView);            //请求重新绘制,将时间选择器显示出来            rootView.requestFocus();        }    }    /**     * 检测该View是不是已经添加到根视图     *     * @return 如果视图已经存在该View返回true     */    public boolean isShowing() {        if (isDialog()) {            return false;        } else {            return rootView.getParent() != null || isShowing;        }    }   /**     * show的时候调用     *     * @param view 这个View     */    private void onAttached(View view) {        decorView.addView(view);        //开启显示的动画        contentContainer.startAnimation(inAnim);    }
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显示TimePickerView的方法看完了,再看看关闭TimePickerView的方法,源码如下:

 public void dismiss() {        if (isDialog()) {        //如果是对话框模式,就直接调用对话框的dismiss方法            dismissDialog();        } else {            //如果已经关闭了,就不继续执行下去了            if (dismissing) {                return;            }            dismissing = true;            //消失动画            outAnim.setAnimationListener(new Animation.AnimationListener() {                @Override                public void onAnimationStart(Animation animation) {                }                @Override                public void onAnimationEnd(Animation animation) {                    decorView.post(new Runnable() {                        @Override                        //动画结束,就将时间控件的布局,从activity的根view中移除                            dismissImmediately();                        }                    });                }                @Override                public void onAnimationRepeat(Animation animation) {                }            });            contentContainer.startAnimation(outAnim);        }    }    public void dismissImmediately() {        //从activity根视图移除        decorView.removeView(rootView);        isShowing = false;        dismissing = false;        if (onDismissListener != null) {            onDismissListener.onDismiss(BasePickerView.this);        }    }
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到此将如何显示TimePickerView的封装分析完了,再来看看TimePickerView中是如何处理取消和确定按钮的点击事件的,源码如下:

  @Override    public void onClick(View v) {        String tag = (String) v.getTag();        if (tag.equals(TAG_CANCEL)) {        //取消,就是直接关闭界面            dismiss();        } else {            //确定            if (timeSelectListener != null) {                try {                //获取选中的时间                    Date date = WheelTime.dateFormat.parse(wheelTime.getTime());                    //回调,将时间传递给使用者                    timeSelectListener.onTimeSelect(date,v);                } catch (ParseException e) {                    e.printStackTrace();                }            }            dismiss();        }    }

三.总结

以上是我对Android-PickerView如何封装TimePickerView的分析,如果看的不是很懂的朋友,下载demo结合源代码进行理解，代码都有注释.Github项目地址:Android-PickerView