Android数字选择器-NumberPicker

来源：互联网发布：23号端口编辑：程序博客网时间：2024/05/17 23:19

实现

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

<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>

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：

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

OnValueChangeListener事件:

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

public void onScrollStateChange(NumberPicker view, int scrollState) {      switch (scrollState) {      case OnScrollListener.SCROLL_STATE_FLING:          Toast.makeText(this, "后续滑动(飞呀飞，根本停不下来)", 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:

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:

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：

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:

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);

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