闹钟设置项目 ---- android应用开发揭秘

Activity01.java

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;
}
}

AlarmReceiver.java

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();
}
}

main.xml

<?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/TextView01"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
  <Button
    android:id="@+id/Button01"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="设置闹钟"
  />
  <Button
    android:id="@+id/Button02"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="取消闹钟"
  />
</LinearLayout>