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https://github.com/Carbs0126/NumberPickerView

another NumberPicker with more flexible attributes on Android platform
https://github.com/Carbs0126/NumberPickerView

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another NumberPicker with more flexible attributes on Android platform

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README 

        
# NumberPickerView

[![Android Arsenal](https://img.shields.io/badge/Android%20Arsenal-NumberPickerView-green.svg?style=true)](https://android-arsenal.com/details/1/3817)

##### Another NumberPicker with more flexible attributes on Android platform



[Chinese][6]



## Forewords

some android projects use the android.widget.NumberPicker to provide alternative choices, but the default style of `NumberPicker` has some inflexible attibutes, and complicated to be customized.This NumberPickerView extends from View, and provide a friendly experience.



### ScreenShot



![Example Image][4]


picking an item dynamically



![Example Image][5]



![Example Image][2]



![Example Image][3]


a small project powered by NumberPickerView, a view which can pick or jump to a certain date with two modes, in Gregorian mode or in Chinese Lunar mode. The gif seem to be a little lag, but actually it runs smoothly. Check the project here:

https://github.com/Carbs0126/GregorianLunarCalendar



### Introduction



`NumberPickerView`extends from `View` and has almost all functions of `android.widget.NumberPicker` except inputting fuction by EditText, but it has some advanced features, here are these two views' differences below:



#### Features of android.widget.NumberPicker

1. the NumberPicker's viewport can only show three items;

2. the value of friction is big, you can not pick a new value smoothly by fling;

3. no animation if you use setValue() in java code to set to a new value;

4. no animation if you use setDisplayValues() to change the content of NumberPicker;

5. has a bug if you set wrap mode by using `setWrapSelectorWheel()`, sometimes NumberPicker will not refresh canvas after setWrapSelectorWheel() until it receive a new MotionEvent;

6. no text hint at the center position;

7. cannot control NumberPicker to smoothly scroll to a certain item (position);

8. NumberPicker class in early version of some customized framework has bugs when changing maxValue and displayedValues.



#### Capabilities of NumberPickerView

1. the NumberPickerView's viewport can show more than three items;

2. able to set the value of friction in java code, you can pick a new value smoothly by fling, in java code, you can use the code below to make friction be twice as former
 `mNumberPickerView.setFriction(2 * ViewConfiguration.get(mContext).getScrollFriction());`

3. items' texts has animation between selected mode and normal mode, including Gradient textColor and Gradient textSize;

4. able to choose if use animation when changing displayedValues;

5. able to setWrapSelectorWheel() dynamically in java code or in xml;

6. able to set a hint text at the center position, default is empty; can change the hint text's color and textSize;

7. able to scroll smoothly to a centain item (position);

8. support `wrap_content` mode,support item's padding

9. has some other attibutes to refine UI

10. not respond `onValueChanged()` during scrolling

11. press the certain item, NumberPickerView will scroll to this item automatically

12. you can set if the `onValueChanged` callbacks invoked in main thread or in sub thread;

13. NumberPickerView has some same compatible fuctions and interfaces with NumberPicker, this makes it easier to change NumberPicker to NumberPickerView in project:

```java

    //compatible fuctions

    setOnValueChangedListener()

    setOnScrollListener()

    setDisplayedValues()/getDisplayedValues()

    setWrapSelectorWheel()/getWrapSelectorWheel()

    setMinValue()/getMinValue()

    setMaxValue()/getMaxValue()

    setValue()/getValue()



    //compatible interfaces

    OnValueChangeListener

    OnScrollListener

```



### How to use



1.import to project

```groovy

    implementation 'cn.carbswang.android:NumberPickerView:1.2.0'

```

or

```xml

    

      cn.carbswang.android

      NumberPickerView

      1.2.0

      pom

    

```

2.add a NumberPickerView in xml

```xml

    



```

3.control NumberPickerView in Java code

  1)if the displayedValues in NumberPickerView will NOT change, you can set data by this way: (same as using NumberPicker)

```java

        picker.setMinValue(minValue);

        picker.setMaxValue(maxValue);

        picker.setValue(value);

```

  2)if the displayedValues in NumberPickerView will change, you can set data by this way: (same as using NumberPicker)

```java

        int minValue = getMinValue();

        int oldMaxValue = getMaxValue();

        int oldSpan = oldMaxValue - minValue + 1;

        int newMaxValue = display.length - 1;

        int newSpan = newMaxValue - minValue + 1;

        if (newSpan > oldSpan) {

            setDisplayedValues(display);

            setMaxValue(newMaxValue);

        } else {

            setMaxValue(newMaxValue);

            setDisplayedValues(display);

        }

```

OR use NumberPickerView's method: 


    `refreshByNewDisplayedValues(String[] display)`


but make sure the minValue will NOT change before and after using this method, and `display` should not be null, and its length should be greater than 0.



4.NumberPickerView also have methods to scroll smoothly 


    `public void smoothScrollToValue(int fromValue, int toValue, boolean needRespond)`



the same point between this method and `setValue(int)`is you can set the current picked item dynamically, the difference is this method can make `NumberPickerView` scroll smoothly from `fromValue` to `toValue` by choosing short distance, the third argument `needRespond` is a boolean flag used to set if you want NumberPickerView invoke its `onValueChanged` callback when scrolling finished this time, because if several `NumberPickerView`s have interconnections, the early stopped `NumberPickerView` invoking callbacks will effect the latter stopped ones. So you can set this flag to be false to avoid invoking `onValueChanged` callback this time. 



and you'd better not use this method in `onCreate(Bundle savedInstanceState)`, if have to do this, you can use in this way:



```java

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        //some code ...

        mNumberPickerView.post(new Runnable() {

            @Override

            public void run() {

                //call smoothScrollToValue()

            }

        });

    }

```



5.introduction of attibutes in xml

```xml

    

        //the count of shown items , default is 3

        //if show dividers

        //color of two dividers

        //divider's margin to the left

        //divider's margin to the right

        //divider's height

        //unselected textColor

        //selected textColor

        //hint text color (the text in the center item)

        //unselected textSize

        //selected textColor

        //hint text size

        //displayedValues

        //minValue, see as setMinValue()

        //maxValue, see as setMaxValue()

        //if set wrap mode, see as setWrapSelectorWheel(boolean)

        //hint text

        //empty item's text,only shown when WrapSelectorWheel==false or displayedValues length not large than showCount

        //distance between hint and the right side of the max wide text in displayedValues

        //distance between hint and the right side of the view

        //item's horizontal padding, used for wrap_content mode

        //item's vertical padding, used for wrap_content mode

        //for reusable `Dialog/PopupWindow`.

        //for selected item background.

        //If `Dialog/PopupWindow` is hiding meanwhile `NumberPickerView` is still scrolling, then we need it to stop scrolling 

        //and respond (or not) `OnValueChange` callbacks and change the previous picked value. 

        //Add a new attr `npv_RespondChangeOnDetached` as a flag to set if respondding `onValueChange` callbacks, 

        //mainly for multi linked NumberPickerViews to correct other NumberPickerView's position or value.

        //But I highly recommend every time showing a `Dialog/PopupWindow` please set certain data for NumberPickerView, 

        //and set `npv_RespondChangeOnDetached` false to avoid respondding `onValueChange` callbacks. 

        //See dialog in my `GregorianLunarCalendar` project. 



        //set if the `onValueChanged` callbacks invoked 

        // in mainThread or in subThread, default is true, in mainThread. set it false if you want to run `onValueChanged` in 

        // subThread.



    //these attibutes below are used under wrap_content mode, 

    //and if you want to change displayedValues with out making NumberPickerView changing its original position(four points of this view), 

    //then you should added these attrs to set a max width

        

        //represents the maxWidth of displayedValues item plus hint width, including hint, the maxWidth used in onMeasure fuction must equal or be larger than this

        //represents the maxWidth of displayedValues item, exclude hint text.

        

        //represents the maxWidth of hint text

    



```







### Version



#### 1.2.0

1.merge some pull requests


2.delete some dependence in library





#### 1.1.0

1.refine the duration of position rewising


2.refine the interval of sending refreshing message


3.refine the sample's UI





#### 1.0.9

1.add attr `app:npv_RespondChangeInMainThread="true"` to set if the `onValueChanged` callbacks invoked in mainThread or in subThread, default is true, in mainThread. set it false if you want to run `onValueChanged` in subThread.

2.update `TimePickerActivity` example, to give a How-To-Use of `app:npv_RespondChangeInMainThread="true"`.

3.fix bug: when change displayed values, if it is scrolling, then the new displayed values' position is not rewised





#### 1.0.8

1.modify method `stopScrolling`, add scroll to current Y method before `abortAnimation()` is invoked 


2.modify `npv_RespondChangeOnDetached`'s default value to false





#### 1.0.7

1.refine code in `onDetachToWindow()` to respond callbacks or not, for reusable `Dialog/PopupWindow`. 
If `Dialog/PopupWindow` is hiding meanwhile `NumberPickerView` is still scrolling, then we need it to stop scrolling and respond (or not) `OnValueChange` callbacks and change the previous picked value. 
Add a new attr `npv_RespondChangeOnDetached` as a flag to set if respondding `onValueChange` callbacks, mainly for multi linked NumberPickerViews to correct other NumberPickerView's position or value.


But I highly recommend every time showing a `Dialog/PopupWindow` please set certain data for NumberPickerView, and set `npv_RespondChangeOnDetached` false to avoid respondding `onValueChange` callbacks. See dialog in my `GregorianLunarCalendar` project. 
These codes are not elegant, If you have any idea, please let me know, thank you.





#### 1.0.6

1.add code in `onDetachToWindow()` to respond callbacks, for reusable `Dialog/PopupWindow`.





#### 1.0.5

1.in method `onAttachToWindow()`, add code to judge if `mHandlerThread`has been `quit()`, this is to avoid of 'can not correct position when show the same Dialog(or PopupWindow) twice '





#### 1.0.4

1.modify some attrs' name





#### 1.0.3

1.fix bug : cannot scroll in `ScrollView`. Thanks Elektroktay's and anjiao's issues






### Mechanisms



#### 1.how to generate scrolling animation

`Scroller` + `VelocityTracker` + `onDraw(Canvas canvas)`



#### 2.how to correct position automatically when scrolling finished

`Handler` refresh current position



#### 3.how to generate Gradient effection

by calculating the current coordinate, get the items which should be shown and the positions of each shown items, comparing the positions and center coordinate of NumberPickerView, get the current color and size of item's text





### how to CHANGE NumberPicker to NumberPickerView



just modify `NumberPicker` text into `NumberPickerView` in java code and xml, keep the methods and interfaces called by NumberPicker the same.



### And something important


UI design inspired by Meizu company, a mobile phone Manufacturer in china. 


A big thanks to google and meizu



enjoy



## License



    Copyright 2016 Carbs.Wang (NumberPickerView)



    Licensed under the Apache License, Version 2.0 (the "License");

    you may not use this file except in compliance with the License.

    You may obtain a copy of the License at



       http://www.apache.org/licenses/LICENSE-2.0



    Unless required by applicable law or agreed to in writing, software

    distributed under the License is distributed on an "AS IS" BASIS,

    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

    See the License for the specific language governing permissions and

    limitations under the License.



[1]: https://github.com/Carbs0126/Screenshot/blob/master/numberpickerview.gif

[2]: https://github.com/Carbs0126/Screenshot/blob/master/numberpickerviewall.jpg

[3]: https://github.com/Carbs0126/Screenshot/blob/master/gregorian_refine.gif

[4]: https://github.com/Carbs0126/Screenshot/blob/master/numberpickerview_refine1.gif

[5]: https://github.com/Carbs0126/Screenshot/blob/master/numberpickerview_refine2.gif

[6]: https://github.com/Carbs0126/NumberPickerView/blob/master/README_ch.md