android 闹钟设置

      在Android中可以通过AlarmManager 来实现闹钟，AlarmManager类是专门用来设定在某个指定的时间去完成指定的事件。AlarmManager 提供了访问系统警报的服务，只要在程序中设置了警报服务，AlarmManager 就会通过onReceive()方法去执行这些事件，就算系统处于待机状态，同样不会影响运行。可以通过 Context.getSystemService 方法来获得该服务。 AlarmManager 中的方法很少。如下所示
 
                             AlarmManager 的方法
           方法                                                                          说明
   cancel                                                                    取消AlarmManager服务
   set                                                                         设置AlarmManager服务
   setInexactRepeating                                                设置不精确周期
   setRepeating                                                          设置精确周期
   setTimeZone                                                           设置时区

    要实现闹钟，首先需要创建一个继承自 BroadcastReceiver 的类，实现 onReceive 方法来接收这个Alarm服务，然后通过建立Intent 和 PendingIntent连接来调用 Alarm组件。当我们点击“设置闹钟”按钮时，通过 TimePickerDialog 来设置时间，当时间到我们指定的时间后onReceive 方法接收Alarm服务  运行效果见下图


设置闹钟时间


时间到后的Toast提示

   首先看看我们实现的接收 Alarm 服务的 AlarmReceiver类，很简单，就是在收到消息后用一个 Toast 来提示用户，代码如下：

package com.yarin.android.Examples_07_07;

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

public class AlarmReceiver extends BroadcastReceiver {
	public void onReceive(Context context, Intent intent) {
		Toast.makeText(context, "你设置的闹钟时间到了", Toast.LENGTH_LONG).show();
	}
}

   由于使用了 BroadcastReceiver 服务，因此需要在 AndroidManifest.xml中进行声明，代码如下：

 <receiver android:name=".AlarmReceiver" android:process=":remote" />

  然后就只需要对"设置闹钟"、"取消闹钟" 的事件进行监听了，代码如下：

package com.yarin.android.Examples_07_07;

import java.util.Calendar;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.TimePickerDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.TimePicker;

public class Activity01 extends Activity {
	Button mButton1;
	Button mButton2;

	TextView mTextView;

	Calendar calendar;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		setContentView(R.layout.main);
		calendar = Calendar.getInstance();

		mTextView = (TextView) findViewById(R.id.TextView01);
		mButton1 = (Button) findViewById(R.id.Button01);
		mButton2 = (Button) findViewById(R.id.Button02);

		mButton1.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				calendar.setTimeInMillis(System.currentTimeMillis());
				int mHour = calendar.get(Calendar.HOUR_OF_DAY);
				int mMinute = calendar.get(Calendar.MINUTE);
				new TimePickerDialog(Activity01.this,
						new TimePickerDialog.OnTimeSetListener() {
							public void onTimeSet(TimePicker view,
									int hourOfDay, int minute) {
								calendar.setTimeInMillis(System
										.currentTimeMillis());
								calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
								calendar.set(Calendar.MINUTE, minute);
								calendar.set(Calendar.SECOND, 0);
								calendar.set(Calendar.MILLISECOND, 0);
								/* 建立Intent和PendingIntent，来调用目标组件 */
								Intent intent = new Intent(Activity01.this,
										AlarmReceiver.class);
								PendingIntent pendingIntent = PendingIntent
										.getBroadcast(Activity01.this, 0,
												intent, 0);
								AlarmManager am;
								/* 获取闹钟管理的实例 */
								am = (AlarmManager) getSystemService(ALARM_SERVICE);
								/* 设置闹钟 */
								am.set(AlarmManager.RTC_WAKEUP, calendar
										.getTimeInMillis(), pendingIntent);
								/* 设置周期闹 */
								am.setRepeating(AlarmManager.RTC_WAKEUP, System
										.currentTimeMillis()
										+ (10 * 1000), (24 * 60 * 60 * 1000),
										pendingIntent);
								String tmpS = "设置闹钟时间为" + format(hourOfDay)
										+ ":" + format(minute);
								mTextView.setText(tmpS);
							}
						}, mHour, mMinute, true).show();
			}
		});

		mButton2.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				Intent intent = new Intent(Activity01.this, AlarmReceiver.class);
				PendingIntent pendingIntent = PendingIntent.getBroadcast(
						Activity01.this, 0, intent, 0);
				AlarmManager am;
				/* 获取闹钟管理的实例 */
				am = (AlarmManager) getSystemService(ALARM_SERVICE);
				/* 取消 */
				am.cancel(pendingIntent);
				mTextView.setText("闹钟已取消！");
			}
		});
	}

	/* 格式化字符串(7:3->07:03) */
	private String format(int x) {
		String s = "" + x;
		if (s.length() == 1)
			s = "0" + s;
		return s;
	}
}

  源码见附件

评论

2 楼 297221412 2013-01-09  

你这个闹钟在关机的情况下能work么？

1 楼 jiejiefalaha 2012-04-09  

哥，你写的有bug