目录
NumberPicker
数值选择器. 使用其上下旋转的方式选择数值.
默认选择数值,可以设定最大值和最小值.以及字体的颜色.
使用方式:
<NumberPicker
android:id="@+id/numberpicker"
android:layout_width="match_parent"
android:layout_height="80dp"
android:focusable="true"
android:focusableInTouchMode="true"/>
image.png
实战
activity_main.xml
文件:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<NumberPicker
android:id="@+id/numberpicker"
android:layout_width="match_parent"
android:layout_height="80dp"
android:focusable="true"
android:focusableInTouchMode="true"/>
</android.support.constraint.ConstraintLayout>
代码:
package com.example.user.numberpicker;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.NumberPicker;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
NumberPicker numberPicker = findViewById(R.id.numberpicker);
//设置最大值
numberPicker.setMaxValue(80);
//设置最小值
numberPicker.setMinValue(60);
//设置当前值
numberPicker.setValue(65);
//设置滑动监听
numberPicker.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
//当NunberPicker的值发生改变时,将会激发该方法
@Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
String toast = "oldVal:" + oldVal + " newVal:" + newVal;
Toast.makeText(MainActivity.this, toast, Toast.LENGTH_SHORT).show();
}
});
}
}
执行效果:
image.png
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