Numberpick的功能和用法
数值选择器，用于用户输入数值，可通过键盘输入数值，也可通过拖动来选择数值
public class MainActivity extends Activity {
NumberPicker np1, np2;
//定义最小值，最大值的初始值
int minfraction = 140, maxfraction = 150;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.numberpicket);
np1 = findViewById(R.id.numberpicket);
np1.setMaxValue(150);
np1.setMinValue(140);
//设置np1的当前值
np1.setValue(minfraction);
//添加监听器
np1.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
//当numberPICKET发生改变的时候，会激发该方法
@Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
minfraction = newVal;
showSelectedPrice();
}
});
np2 = findViewById(R.id.numberpicket01);
np2.setMinValue(145);
np2.setMaxValue(150);
//设置当前值
np2.setValue(maxfraction);
//添加监听器
np2.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
@Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
minfraction = newVal;
showSelectedPrice();
}
});
}
private void showSelectedPrice() {
Toast.makeText(this, "你的单科最低分是" + minfraction + "你单科的最高分是" + maxfraction, Toast.LENGTH_LONG).show();
}
}
<?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="wrap_content">
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="120dp"
android:layout_height="wrap_content"
android:text="单科最小分数" />
<NumberPicker
android:id="@+id/numberpicket"
android:layout_width="match_parent"
android:layout_height="150dp"
android:focusable="true"
android:focusableInTouchMode="true" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="120dp"
android:layout_height="wrap_content"
android:text="单科最大分数"></TextView>
<NumberPicker
android:id="@+id/numberpicket01"
android:layout_width="match_parent"
android:layout_height="150dp"
android:focusable="true"
android:focusableInTouchMode="true" />
</TableRow>
</TableLayout>
