简单实现Android闹钟程序附源码

package com.example.clock;

import java.util.Calendar;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.TimePickerDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.TimePicker;

public class ClockDemo extends Activity {

 private Button mSet;
 Calendar mCalendar = Calendar.getInstance();

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);
 ObjectPool.mAlarmHelper = new AlarmHelper(this);
 mSet = (Button) findViewById(R.id.mSet);
 setListener();
 }

 public void setListener() {
 mSet.setOnClickListener(new View.OnClickListener() {
 public void onClick(View v) {
 mCalendar.setTimeInMillis(System.currentTimeMillis());
 int mHour = mCalendar.get(Calendar.HOUR_OF_DAY);
 int mMinute = mCalendar.get(Calendar.MINUTE);
 new TimePickerDialog(ClockDemo.this,
  new TimePickerDialog.OnTimeSetListener() {
  public void onTimeSet(TimePicker view,
   int hourOfDay, int minute) {
  mCalendar.setTimeInMillis(System
   .currentTimeMillis());
  mCalendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
  mCalendar.set(Calendar.MINUTE, minute);
  mCalendar.set(Calendar.SECOND, 0);
  mCalendar.set(Calendar.MILLISECOND, 0);
  ObjectPool.mAlarmHelper.openAlarm(32, "ddd",
   "ffff", mCalendar.getTimeInMillis());
  }
  }, mHour, mMinute, true).show();
 }
 });
 }

 @Override
 public boolean onKeyDown(int keyCode, KeyEvent event) {
 if (keyCode == KeyEvent.KEYCODE_BACK) {
 showBackDialog();
 return true;
 }
 return super.onKeyDown(keyCode, event);
 }

 /** Give the tip when exit the application. */
 public void showBackDialog() {
 final AlertDialog.Builder builder = new AlertDialog.Builder(this);
 builder.setTitle("提示")
 .setIcon(R.drawable.icon)
 .setMessage("是否退出&＃63;")
 .setPositiveButton("sure",
  new DialogInterface.OnClickListener() {
  public void onClick(DialogInterface dialog,
   int which) {
  System.exit(0);
  android.os.Process
   .killProcess(android.os.Process.myPid());

  dialog.dismiss();
  }
  })
 .setNegativeButton("cancel",
  new DialogInterface.OnClickListener() {
  public void onClick(DialogInterface dialog,
   int which) {
  dialog.dismiss();
  }
  });
 AlertDialog ad = builder.create();
 ad.show();
 }

}

package com.example.clock;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;

public class AlarmHelper {

 private Context c;
 private AlarmManager mAlarmManager;

 public AlarmHelper(Context c) {
 this.c = c;
 mAlarmManager = (AlarmManager) c
 .getSystemService(Context.ALARM_SERVICE);
 }

 public void openAlarm(int id, String title, String content, long time) {
 Intent intent = new Intent();
 intent.putExtra("_id", id);
 intent.putExtra("title", title);
 intent.putExtra("content", content);
 intent.setClass(c, CallAlarm.class);
 PendingIntent pi = PendingIntent.getBroadcast(c, id, intent,
 PendingIntent.FLAG_UPDATE_CURRENT);
 mAlarmManager.set(AlarmManager.RTC_WAKEUP, time, pi);
 }

 public void closeAlarm(int id, String title, String content) {
 Intent intent = new Intent();
 intent.putExtra("_id", id);
 intent.putExtra("title", title);
 intent.putExtra("content", content);
 intent.setClass(c, CallAlarm.class);
 PendingIntent pi = PendingIntent.getBroadcast(c, id, intent, 0);
 mAlarmManager.cancel(pi);
 }
}

package com.example.clock;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class CallAlarm extends BroadcastReceiver {
 @Override
 public void onReceive(Context context, Intent intent) {
 intent.setClass(context, AlarmAlert.class);
 intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 context.startActivity(intent);
 }
}

package com.example.clock;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;

public class AlarmAlert extends Activity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 new AlertDialog.Builder(AlarmAlert.this)
 .setIcon(R.drawable.clock)
 .setTitle("ddd")
 .setMessage("fff")
 .setPositiveButton("ddd",
  new DialogInterface.OnClickListener() {
  public void onClick(DialogInterface dialog,
   int whichButton) {
  System.exit(0);
  android.os.Process
   .killProcess(android.os.Process.myPid());
  }
  }).show();
 }
}
ObjectPool.java
public class ObjectPool {

 /** The alarm object. */
 public static AlarmHelper mAlarmHelper;

}