Android开发之滑动数值选择器NumberPicker用法示例

<?xml version="1.0" encoding="utf-8" ?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical">
  <TableRow
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:orientation="vertical">
    <TextView
      android:text="选择时钟"
      android:textSize="20dp"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"/>
    <NumberPicker
      android:id="@+id/np1"
      android:solidColor="@color/colorPrimaryDark"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:focusable="true"
      android:focusableInTouchMode="true"/>
  </TableRow>
  <TableRow
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:orientation="vertical">
    <TextView
      android:text="选择分钟"
      android:textSize="20dp"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"/>
    <NumberPicker
      android:id="@+id/np2"
      android:solidColor="@color/colorAccent"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:focusable="true"
      android:focusableInTouchMode="true" />
  </TableRow>
</TableLayout>

public class MainActivity extends Activity {
  private NumberPicker np1,np2;
  //定义上下限具体值
  private int min = 10,max = 50;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    np1 = (NumberPicker) findViewById(R.id.np1);
    //设置np1的最大值只和最小值
    np1.setMinValue(0);
    np1.setMaxValue(23);
    //设置哪怕的当前值
    np1.setValue(min);
    np1.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
      @Override
      public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
        min = newVal;
        showSelectedPrice();
      }
    });
    np2 = (NumberPicker) findViewById(R.id.np2);
    //设置np1的最大值只和最小值
    np2.setMinValue(0);
    np2.setMaxValue(23);
    //设置哪怕的当前值
    np2.setValue(max);
    np2.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
      @Override
      public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
        min = newVal;
        showSelectedPrice();
      }
    });
  }
  private void showSelectedPrice(){
    Toast.makeText(MainActivity.this,"设定闹钟时间为：" + min + " : " + max,Toast.LENGTH_SHORT).show();
  }
}