Android--闹钟小程序（Broadcast实现）

1.定义闹钟的提示Activity程序类-AlarmManager

package org.lxh.demo;

import java.sql.Date;
import java.text.SimpleDateFormat;

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

public class AlarmMessage extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		new AlertDialog.Builder(this)//设置弹出窗
				.setIcon(R.drawable.pic_m)
				.setTitle("闹钟时间到！")
				.setMessage(
						"闹钟响起，现在时间是："
								+ new SimpleDateFormat("yyyy年MM月dd日HH时mm分ss秒")
										.format(new Date(System
												.currentTimeMillis())))
				.setPositiveButton("关闭", new DialogInterface.OnClickListener() {

					public void onClick(DialogInterface arg0, int arg1) {
						AlarmMessage.this.finish();

					}
				}).show();
	}

}

2.定义广播接受类-MyAlarmReceiver

package org.lxh.demo;

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

public class MyAlarmReceiver extends BroadcastReceiver {

	@Override
	public void onReceive(Context context, Intent intent) {
		Intent it=new Intent(context,AlarmMessage.class);//定义要操作的Intent
		it.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);//传递一个新的任务标记
		context.startActivity(it);//启动Intent

	}

}

3.定义布局管理器-main.xml

4.定义Activity操作闹钟

package org.lxh.demo;

import java.util.Calendar;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
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;
import android.widget.TimePicker.OnTimeChangedListener;
import android.widget.Toast;

public class Hello extends Activity {
	private AlarmManager alarm = null;
	private Button set = null;
	private Button delete = null;
	private TextView msg = null;
	private Calendar calendar = Calendar.getInstance();
	private TimePicker time = null;
	private int hourOfDay = 0;
	private int minute = 0;

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState); // 生命周期方法
		super.setContentView(R.layout.main); // 设置要使用的布局管理器
		this.time = (TimePicker) super.findViewById(R.id.time);
		this.set = (Button) super.findViewById(R.id.set);
		this.delete = (Button) super.findViewById(R.id.delete);
		this.msg = (TextView) super.findViewById(R.id.msg);
		this.set.setOnClickListener(new SetOnClickListenerImpl());
		this.delete.setOnClickListener(new DeleteOnClickListenerImpl());
		this.alarm = (AlarmManager) super
				.getSystemService(Context.ALARM_SERVICE);
		this.time.setOnTimeChangedListener(new OnTimeChangedListenerImpl());
		this.time.setIs24HourView(true);

	}

	private class SetOnClickListenerImpl implements OnClickListener {

		public void onClick(View arg0) {
			Intent intent = new Intent(Hello.this, MyAlarmReceiver.class);//指定跳转的Intent
			intent.setAction("org.lxh.action.setalarm");//定义广播的Action
			PendingIntent sender = PendingIntent.getBroadcast(Hello.this, 0,
					intent, PendingIntent.FLAG_CANCEL_CURRENT);//指定PendingIntent
			Hello.this.alarm.set(AlarmManager.RTC_WAKEUP,
					Hello.this.calendar.getTimeInMillis(), sender);//设置闹钟
			Hello.this.msg.setText("闹钟响起的时间是：" + Hello.this.hourOfDay + "时"
					+ Hello.this.minute + "分。");
			Toast.makeText(Hello.this, "闹钟设置成功！", Toast.LENGTH_LONG).show();
		}

	}

	private class DeleteOnClickListenerImpl implements OnClickListener {

		public void onClick(View arg0) {
			if(Hello.this.alarm!=null){
				Intent intent = new Intent(Hello.this, MyAlarmReceiver.class);
				PendingIntent sender = PendingIntent.getBroadcast(Hello.this, 0,
						intent, PendingIntent.FLAG_CANCEL_CURRENT);
				Hello.this.alarm.cancel(sender);//取消闹钟
				Hello.this.msg.setText("当前没有设置闹钟。");
				Toast.makeText(Hello.this, "闹钟删除成功！", Toast.LENGTH_LONG).show();
			}

		}

	}

	private class OnTimeChangedListenerImpl implements OnTimeChangedListener {

		public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
			Hello.this.calendar.setTimeInMillis(System.currentTimeMillis());//设置当前时间
			Hello.this.calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);//设置时间
			Hello.this.calendar.set(Calendar.MINUTE, minute);
			Hello.this.calendar.set(Calendar.SECOND, 0);
			Hello.this.calendar.set(Calendar.MILLISECOND, 0);
			Hello.this.hourOfDay = hourOfDay;
			Hello.this.minute = minute;
		}

	}
}

5.在AndroidManfiest.xml文件中进行配置

运行实例：