Android DatePicker TimePicker

<DatePicker
android:id="@+id/datePicker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>

<TimePicker
android:id="@+id/timePicker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="250dp"

/>

<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="450dp"
/>

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

datePicker = (DatePicker)findViewById(R.id.datePicker);
timePicker = (TimePicker)findViewById(R.id.timePicker);
textView = (TextView)findViewById(R.id.textView);

//获取当前的年月日时分
Calendar calendar = Calendar.getInstance();
year = calendar.get(Calendar.YEAR);
month = calendar.get(Calendar.MONTH);
day = calendar.get(Calendar.DAY_OF_MONTH);
hour = calendar.get(Calendar.HOUR);
minute = calendar.get(Calendar.MINUTE);

//初始化DatePiker组件，指定监听器
datePicker.init(year, month, day, new DatePicker.OnDateChangedListener() {
@Override
public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
MainActivity.this.year = year;
MainActivity.this.month = month;
MainActivity.this.day = day;

//显示当前日期
textView.setText("当前日期为:"+year+"年"+month+"月"+day+"日");
}
});

//给TimePicker添加监听器
timePicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {
@Override
public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
MainActivity.this.hour = hour;
MainActivity.this.minute = minute;

//显示当前日期
textView.setText("当前日期为:"+year+"年"+month+"月"+day+"日"+hour+"时"+minute+"分");
}
});

}

}