Android 原生NumberPicker

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开发东西先看下效果吧:

NumberPicker和TextView显示一下时间,线性布局,看下布局文件吧:

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    tools:context="com.example.googlenumberpicker.MainActivity" >
 
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:layout_marginLeft="50dp"
        android:layout_gravity="center_horizontal" >
 
        <NumberPicker
            android:id="@+id/hourpicker"
            android:layout_width="40dp"
            android:layout_height="wrap_content" />
 
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:text="时" />
 
        <NumberPicker
            android:id="@+id/minuteicker"
            android:layout_width="40dp"
            android:layout_height="wrap_content" />
 
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:text="分" />
    </LinearLayout>
 
</LinearLayout>

 Demo实现

数字选择是可以滑动,所以需要定义一个OnValueChangeListener事件,OnScrollListener滑动事件,Formatter事件:

Formatter事件:

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public String format(int value) {
       String tmpStr = String.valueOf(value);
       if (value < 10) {
           tmpStr = "0" + tmpStr;
       }
       return tmpStr;
   }

 OnValueChangeListener事件:

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public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
      Toast.makeText(
              this,
              "原来的值 " + oldVal + "--新值: "
                      + newVal, Toast.LENGTH_SHORT).show();
  }

OnScrollListener滑动事件,滑动事件有三个状态:

SCROLL_STATE_FLING:手离开之后还在滑动

SCROLL_STATE_IDLE:不滑动

SCROLL_STATE_TOUCH_SCROLL:滑动中

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public void onScrollStateChange(NumberPicker view, int scrollState) {
      switch (scrollState) {
      case OnScrollListener.SCROLL_STATE_FLING:
          Toast.makeText(this"后续滑动(飞呀飞,根本停下来)", Toast.LENGTH_LONG)
                  .show();
          break;
      case OnScrollListener.SCROLL_STATE_IDLE:
          Toast.makeText(this"不滑动", Toast.LENGTH_LONG).show();
          break;
      case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
          Toast.makeText(this"滑动中", Toast.LENGTH_LONG)
                  .show();
          break;
      }
  }

 初始化:

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hourPicker=(NumberPicker) findViewById(R.id.hourpicker);
    minutePicker=(NumberPicker) findViewById(R.id.minuteicker);
    init();

 init方法中,设置数字的最大值,最小值,以及滑动事件:

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private void init() {
     hourPicker.setFormatter(this);
     hourPicker.setOnValueChangedListener(this);
     hourPicker.setOnScrollListener(this);
     hourPicker.setMaxValue(24);
     hourPicker.setMinValue(0);
     hourPicker.setValue(9);
      
     minutePicker.setFormatter(this);
     minutePicker.setOnValueChangedListener(this);
     minutePicker.setOnScrollListener(this);
     minutePicker.setMaxValue(60);
     minutePicker.setMinValue(0);
     minutePicker.setValue(49);
 }

  还差一步,Activity需要继承一下OnValueChangeListener,OnScrollListener,Formatter:

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public class MainActivity extends Activity implements OnValueChangeListener,OnScrollListener,Formatter{...}

 最后说一点就是NumberPicker也是可以显示文字的,重新定义一个NumberPicker,加载一下:

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valuepicker = (NumberPicker) findViewById(R.id.valuepicker);
        String[] city = {"立水桥","霍营","回龙观","龙泽","西二旗","上地"};
        valuepicker.setDisplayedValues(city);
        valuepicker.setMinValue(0);
        valuepicker.setMaxValue(city.length - 1);
        valuepicker.setValue(4);

  最后显示的效果:

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