package com.b510;import java.util.Calendar;import android.app.Activity;import android.app.Dialog;import android.app.TimePickerDialog;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.TimePicker;public class HelloTimePicker extends Activity {  /* 顯示時間信息 */  private TextView tvTimePickerDisplay;  /* 設置時間按鈕 */  private Button btnTimePicker;  /* 小時 */  private int mHour;  /* 分鐘 */  private int mMinute;  /* 標識 dialog的id */  static final int TIME_DIALOG_ID = 0;  /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    this.tvTimePickerDisplay = (TextView) this        .findViewById(R.id.tv_timepicker_display);    this.btnTimePicker = (Button) findViewById(R.id.btn_timepicker);    btnTimePicker.setOnClickListener(listener);    // get the current time    final Calendar c = Calendar.getInstance();    mHour = c.get(Calendar.HOUR_OF_DAY);    mMinute = c.get(Calendar.MINUTE);    // display the current date    updateDisplay();  }  private OnClickListener listener = new OnClickListener() {    @Override    public void onClick(View v) {      showDialog(TIME_DIALOG_ID);    }  };  // updates the time we display in the TextView  private void updateDisplay() {    tvTimePickerDisplay.setText(new StringBuilder().append(pad(mHour)).append(":")        .append(pad(mMinute)));  }  private static String pad(int c) {    if (c >= 10)      return String.valueOf(c);    else      return "0" + String.valueOf(c);  }  // the callback received when the user "sets" the time in the dialog  private TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener() {    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {      mHour = hourOfDay;      mMinute = minute;      updateDisplay();    }  };  @Override  protected Dialog onCreateDialog(int id) {    switch (id) {    case TIME_DIALOG_ID:      return new TimePickerDialog(this, mTimeSetListener, mHour, mMinute,          true);    }    return null;  }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  ><TextView   android:id="@+id/tv_timepicker_display"  android:layout_width="fill_parent"   android:layout_height="wrap_content" /><Button  android:id="@+id/btn_timepicker"  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:text="Change the time"/></LinearLayout>