缩小的时间选择器(纪念该死的MX4)

首先,庆祝我司婴儿喂养记录类应用“萌萌记”登陆各大应用市场,时间仓促,水平有限,多有不足,企望海涵。(做出伟大产品的公司,自我评价往往以“批评”和“自嘲”为主,而不是以“肯定”和“表扬”为主。我认识的杰出成就人士都认为自己做的不好,之所以能成功只是因为其他人做的更差。——Paul Graham,哈哈哈)

言归正传,android应用中日期选择器与时间选择器用的场景很多,但是原生控件并不好用。例如,需求是弹出一个Dialog,在Dialog上并排显示DatePicker与TimePicker,会发现大多屏幕放不下。此时,我们百度一下(别吐槽我用百度,百度只是个孩子),会得到

    /**
     * 调整FrameLayout大小
     * @param tp
     */
    public static void resizePikcer(FrameLayout tp){
        List<NumberPicker> npList = findNumberPicker(tp);
        for(NumberPicker np:npList){
            resizeNumberPicker(np);
        }
    }
    /**
     * 得到viewGroup里面的numberpicker组件
     * @param viewGroup
     * @return
     */
    private static List<NumberPicker> findNumberPicker(ViewGroup viewGroup){
        List<NumberPicker> npList = new ArrayList<NumberPicker>();
        View child = null;
        if(null != viewGroup){
            for(int i = 0;i<viewGroup.getChildCount();i++){
                child = viewGroup.getChildAt(i);
                if(child instanceof NumberPicker){
                    npList.add((NumberPicker)child);
                }
                else if(child instanceof LinearLayout){
                    List<NumberPicker> result = findNumberPicker((ViewGroup)child);
                    if(result.size()>0){
                        return result;
                    }
                }
            }
        }
        return npList;
    }
        /*
         * 调整numberpicker大小
         */
    private static void resizeNumberPicker(NumberPicker np){
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(100, LinearLayout.LayoutParams.WRAP_CONTENT);
        params.setMargins(15, 5, 15, 5);
        np.setLayoutParams(params);
    }

代码讲的很清晰,遍历ViewGroup,拿到里面的NumberPicker,重设NumberPickerd的宽度和margin。可能有人不明白为什么取NumberPicker,因为DatePicker与TimePicker就是NumberPicker拼成的。 然后,我们做下适配


    int picker_width = (screen_width-margin)/5-30;//年月日时分5项
    float text_size = picker_width/4;
    Utils.resizeNumberPicker(picker, picker_width);

    public static void resizeNumberPicker(NumberPicker np,int width){
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(width, LinearLayout.LayoutParams.WRAP_CONTENT);
        params.setMargins(15, 5, 15, 5);
        np.setLayoutParams(params);
    }

打完收工......怎么可能!!!这么写还有点干货么??!!上面只是开胃甜品,下面是正餐。

纪念该死的MX4

跑到MX4上,我懵逼了,原生DatePicker被改成了好大一个日历!!! 没办法了,只能用NumberPicker去拼一个了


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/dialog"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:background="@drawable/white_shape"
    android:paddingTop="20dp"
    android:paddingBottom="20dp"
    android:paddingRight="20dp"
    android:paddingLeft="20dp"
    android:gravity="center_horizontal"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="15dp"
        android:layout_marginRight="15dp"
        android:gravity="center"
        android:orientation="horizontal">

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical">
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal">
                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="center"
                    android:text="年"
                    android:textColor="@color/font_color_1"
                    android:textSize="16sp"/>
                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="center"
                    android:text="月"
                    android:textColor="@color/font_color_1"
                    android:textSize="16sp"/>
                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="center"
                    android:text="日"
                    android:textColor="@color/font_color_1"
                    android:textSize="16sp"/>
                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="center"
                    android:text="时"
                    android:textColor="@color/font_color_1"
                    android:textSize="16sp"/>
                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="center"
                    android:text="分"
                    android:textColor="@color/font_color_1"
                    android:textSize="16sp"/>
                </LinearLayout>
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal">
                <LinearLayout
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:gravity="center_horizontal"
                    android:layout_weight="1">
                <NumberPicker
                    android:id= "@+id/picker_year"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"

                    />
                </LinearLayout>
                <LinearLayout
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:gravity="center_horizontal"
                    android:layout_weight="1">
                    <NumberPicker
                        android:id= "@+id/picker_month"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        />
                </LinearLayout>
                <LinearLayout
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:gravity="center_horizontal"
                    android:layout_weight="1">
                    <NumberPicker
                        android:id= "@+id/picker_day"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        />
                </LinearLayout>
                <LinearLayout
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:gravity="center_horizontal"
                    android:layout_weight="1">
                    <NumberPicker
                        android:id= "@+id/picker_hour"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        />
                </LinearLayout>
                <LinearLayout
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:gravity="center_horizontal"
                    android:layout_weight="1">
                    <NumberPicker
                        android:id= "@+id/picker_minute"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        />
                </LinearLayout>
            </LinearLayout>
            </LinearLayout>


    </LinearLayout>

    <ImageView
        android:id="@+id/submit"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_marginTop="30dp"
        android:src="@mipmap/btn_queren" />
</LinearLayout>

        picker_year = (NumberPicker) layout.findViewById(R.id.picker_year);
        picker_month = (NumberPicker) layout.findViewById(R.id.picker_month);
        picker_day = (NumberPicker) layout.findViewById(R.id.picker_day);
        picker_hour = (NumberPicker) layout.findViewById(R.id.picker_hour);
        picker_minute = (NumberPicker) layout.findViewById(R.id.picker_minute);
        picker_year.setMaxValue(2020);
        picker_year.setMinValue(2010);
        if(year<=2020 && year>=2010){
            picker_year.setValue(year);
        }else{
            picker_year.setValue(2015);
        }


        picker_month.setFormatter(new timeFormatter());
        picker_month.setMaxValue(12);
        picker_month.setMinValue(1);
        picker_month.setValue(month);

        picker_month.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
            @Override
            public void onValueChange(NumberPicker numberPicker, int i, int i2) {
                picker_day.setMaxValue(DateTimeUtils.getMaxDaysofMonth(year, numberPicker.getValue() ));
            }
        });
        picker_day.setFormatter(new timeFormatter());
        picker_day.setMaxValue(DateTimeUtils.getMaxDaysofMonth(year,month));
        picker_day.setMinValue(1);
        picker_day.setValue(day);

        picker_hour.setFormatter(new timeFormatter());
        picker_hour.setMaxValue(23);
        picker_hour.setMinValue(0);
        picker_hour.setValue(hour);

        picker_minute.setFormatter(new timeFormatter());
        picker_minute.setMaxValue(59);
        picker_minute.setMinValue(0);
        picker_minute.setValue(minute);

        ImageView img_submit = (ImageView) layout.findViewById(R.id.submit);
        img_submit.setOnClickListener(onClickListener);

并排放5个NumberPicker,伪装成DatePicker与TimePicker。 然后用上面提到的方法缩小到能完美显示。 但是,还有一个问题,字体大小!!! OK,NumberPicker是变小了,但是里面的数字显示不全了能叫完美显示么?怎么办?Read The Fucking Source Code! NumberPicker的源码中有一个对象叫mSelectorWheelPaint,滑轮上的字都是它画的,这还不够,点击NumberPicker中间是会出现一个EditText的,不能忘了它


        public static void setChildTextSize(ViewGroup root,float size) {


        Field field;
        try {
            field = root.getClass().getDeclaredField("mSelectorWheelPaint");

            field.setAccessible(true);
            Paint paint = (Paint) field.get(root);
            paint.setTextSize(size);
            field = root.getClass().getDeclaredField("mInputText");
            field.setAccessible(true);
            EditText editText = (EditText) field.get(root);
            editText.setTextSize(ScreenUtils.px2dp(MilkingApplication.getInstance().getApplicationContext(),size));
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
}

通过Java反射机制,拿到mSelectorWheelPaint,mInputText这两个对象,尽情的setTextSize吧。

一点小技巧,比较话唠,写了很长,有时候对原生控件做一点小改动,就能完美得完成我们的需求,并不需要去自定义View写一大堆代码。 完整的项目我会找时间整理后上传到Github,今天就算了,带了笔记本,没带电源适配器...

本文出自Yang,转载时请注明出处及相应链接。