Android日期选择器练习

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".DataTest"
    android:padding="15dp"
    >

    <DatePicker
        android:id="@+id/datapicker"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:datePickerMode="spinner"//这个是设置日期选择器的格式样式的
    ></DatePicker>
</LinearLayout>

public class DataTest extends AppCompatActivity implements DatePicker.OnDateChangedListener{

    private DatePicker datapicker;
    int year,month,day;

    @SuppressLint("WrongViewCast")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_data_test);

        //有关java中的Calendar使用
        datapicker = findViewById(R.id.datapicker);

        Calendar calendar = Calendar.getInstance();//获得Calendar对象
        year = calendar.get(Calendar.YEAR);
        month = calendar.get(Calendar.MONTH);
        day = calendar.get(Calendar.DAY_OF_MONTH);

        //初始化
        datapicker.init(year,month,day,this);
    }

    @Override
    public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
        Toast.makeText(this, "您选择的日期是:"+year+"年"+(monthOfYear+1)+"月"+dayOfMonth+"日!", Toast.LENGTH_SHORT).show();
    }
}