【Android 开发】：UI控件之时间和日期对话框控件的的使用(四)

    上一讲我们讲解了ProgressDialog的对话框的操作，这一讲我们来讲解一下日期和时间的对话框的操作

1. DatePickerDialog 日期对话框的操作

    查看 DatePickerDialog 的API文档，它也是继承关系如下所示：

DatePickerDialog extends AlertDialog

    implements DialogInterface.OnClickListener DatePicker.OnDateChangedListener

构造方法如下：

public DatePickerDialog (Context context, DatePickerDialog.OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth)

Context context：上下文对象

DatePickerDialog.OnDateSetListener callBack 第二个参数表示，当点击改变日期时，会触发这个回调

int year, int monthOfYear, int dayOfMonth 初始化年月日

2. TimePickerDialog 时间对话框的操作

时间对话框与日期对话框的操作类似。

public TimePickerDialog (Context context, TimePickerDialog.OnTimeSetListener callBack, int hourOfDay, int minute, boolean is24HourView)

    最后一个参数，表示选择二十四小时的形式，或者分为上午/下午的形式

    is24HourView    Whether this is a 24 hour view, or AM/PM.

3. 程序代码

public class MainActivity extends Activity {    private Button button;    private Button button2;    // 初始化年月日    private int year;    private int monthOfYear;    private int dayOfMonth;        // 初始化时间    private int hourOfDay;    private int minute;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initComponent();        // 初始化年月日        Calendar calendar = Calendar.getInstance();        year = calendar.get(Calendar.YEAR);        monthOfYear = calendar.get(Calendar.MONTH);        dayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);                // 初始化时间        hourOfDay = calendar.get(Calendar.HOUR_OF_DAY);        minute = calendar.get(Calendar.MINUTE);        button.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                // TODO Auto-generated method stub                DatePickerDialog datePickerDialog = new DatePickerDialog(MainActivity.this,                        new OnDateSetListener() {                            //当选中日期时候会触发这一个效果                            @Override                            public void onDateSet(DatePicker view, int year, int monthOfYear,                                    int dayOfMonth) {                                // TODO Auto-generated method stub                                String str = year + "年-" + monthOfYear + "月-" + dayOfMonth + "日";                                Toast.makeText(MainActivity.this, str, 3).show();                            }                        }, year,                        monthOfYear, dayOfMonth);                datePickerDialog.show();            }        });                        button2.setOnClickListener(new OnClickListener() {                        @Override            public void onClick(View v) {                // TODO Auto-generated method stub                TimePickerDialog timePickerDialog = new TimePickerDialog(MainActivity.this, new OnTimeSetListener() {                                        @Override                    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {                        // TODO Auto-generated method stub                        String str1 = hourOfDay + "时-" + minute + "分";                        Toast.makeText(MainActivity.this, str1, 3).show();                    }                }, hourOfDay, minute, true);                timePickerDialog.show();            }        });    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    private void initComponent() {        button = (Button) findViewById(R.id.button1);        button2 = (Button) findViewById(R.id.button2);    }}

4. 执行过程