package org.crazyit.broadcast;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.TextView;
/**
* Description:
* <br/>site: <a href="http://www.crazyit.org">crazyit.org</a>
* <br/>Copyright (C), 2001-2012, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author Yeeku.H.Lee [email protected]
* @version 1.0
*/
public class MusicBox extends Activity
implements OnClickListener
{
// 获取界面中显示歌曲标题、作者文本框
TextView title , author;
//播放/暂停、停止按钮
ImageButton play , stop;
ActivityReceiver activityReceiver;
public static final String CTL_ACTION
= "org.crazyit.action.CTL_ACTION";
public static final String UPDATE_ACTION
= "org.crazyit.action.UPDATE_ACTION";
// 定义音乐的播放状态，0x11代表没有播放；0x12代表正在播放；0x13代表暂停
int status = 0x11;
String[] titleStrs = new String[]{
"心愿",
"约定",
"美丽新世界"
};
String[] authorStrs = new String[]{
"未知艺术家",
"周蕙",
"伍佰"
};
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 获取程序界面界面中的两个按钮
play = (ImageButton) this.findViewById(R.id.play);
stop = (ImageButton) this.findViewById(R.id.stop);
title = (TextView) findViewById(R.id.title);
author = (TextView) findViewById(R.id.author);
// 为两个按钮的单击事件添加监听器
play.setOnClickListener(this);
stop.setOnClickListener(this);
activityReceiver = new ActivityReceiver();
// 创建IntentFilter
IntentFilter filter = new IntentFilter();
// 指定BroadcastReceiver监听的Action
filter.addAction(UPDATE_ACTION);
// 注册BroadcastReceiver
registerReceiver(activityReceiver, filter);
Intent intent = new Intent(this, MusicService.class);
// 启动后台Service
startService(intent);
}
// 自定义的BroadcastReceiver，负责监听从Service传回来的广播
public class ActivityReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
// 获取Intent中的update消息，update代表播放状态
int update = intent.getIntExtra("update", -1);
// 获取Intent中的current消息，current代表当前正在播放的歌曲
int current = intent.getIntExtra("current", -1);
if(current >= 0)
{
title.setText(titleStrs[current]);
author.setText(authorStrs[current]);
}
switch (update)
{
case 0x11:
play.setImageResource(R.drawable.play);
status = 0x11;
break;
// 控制系统进入播放状态
case 0x12:
// 播放状态下设置使用暂停图标
play.setImageResource(R.drawable.pause);
// 设置当前状态
status = 0x12;
break;
// 控制系统进入暂停状态
case 0x13:
// 暂停状态下设置使用播放图标
play.setImageResource(R.drawable.play);
// 设置当前状态
status = 0x13;
break;
}
}
}
@Override
public void onClick(View source)
{
// 创建Intent
Intent intent = new Intent("org.crazyit.action.CTL_ACTION");
switch (source.getId())
{
// 按下播放/暂停按钮
case R.id.play:
intent.putExtra("control", 1);
break;
// 按下停止按钮
case R.id.stop:
intent.putExtra("control", 2);
break;
}
// 发送广播 ，将被Service组件中的BroadcastReceiver接收到
sendBroadcast(intent);
}
}
/**
*
*/
package org.crazyit.broadcast;
import java.io.IOException;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.IBinder;
/**
* Description:
* <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
* <br/>Copyright (C), 2001-2012, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author Yeeku.H.Lee [email protected]
* @version 1.0
*/
public class MusicService extends Service
{
MyReceiver serviceReceiver;
AssetManager am;
String[] musics = new String[]{
"wish.mp3",
"promise.mp3",
"beautiful.mp3"
};
MediaPlayer mPlayer;
//当前的状态,0x11 代表没有播放 ；0x12代表 正在播放；0x13代表暂停
int status = 0x11;
// 记录当前正在播放的音乐
int current = 0;
@Override
public IBinder onBind(Intent intent)
{
return null;
}
@Override
public void onCreate()
{
am = getAssets();
// 创建BroadcastReceiver
serviceReceiver = new MyReceiver();
// 创建IntentFilter
IntentFilter filter = new IntentFilter();
filter.addAction(MusicBox.CTL_ACTION);
registerReceiver(serviceReceiver, filter);
// 创建MediaPlayer
mPlayer = new MediaPlayer();
// 为MediaPlayer播放完成事件绑定监听器
mPlayer.setOnCompletionListener(new OnCompletionListener()
{
@Override
public void onCompletion(MediaPlayer mp)
{
current++;
if (current >= 3)
{
current = 0;
}
/* 发送广播通知Activity更改文本框 */
Intent sendIntent = new Intent(MusicBox.UPDATE_ACTION);
sendIntent.putExtra("current", current);
// 发送广播 ，将被Activity组件中的BroadcastReceiver接收到
sendBroadcast(sendIntent);
// 准备、并播放音乐
prepareAndPlay(musics[current]);
}
});
super.onCreate();
}
public class MyReceiver extends BroadcastReceiver
{
@Override
public void onReceive(final Context context, Intent intent)
{
int control = intent.getIntExtra("control", -1);
switch (control)
{
// 播放或暂停
case 1:
// 原来处于没有播放状态
if (status == 0x11)
{
// 准备、并播放音乐
prepareAndPlay(musics[current]);
status = 0x12;
}
// 原来处于播放状态
else if (status == 0x12)
{
// 暂停
mPlayer.pause();
// 改变为暂停状态
status = 0x13;
}
// 原来处于暂停状态
else if (status == 0x13)
{
// 播放
mPlayer.start();
// 改变状态
status = 0x12;
}
break;
// 停止声音
case 2:
// 如果原来正在播放或暂停
if (status == 0x12 || status == 0x13)
{
// 停止播放
mPlayer.stop();
status = 0x11;
}
}
/* 发送广播通知Activity更改图标、文本框 */
Intent sendIntent = new Intent(MusicBox.UPDATE_ACTION);
sendIntent.putExtra("update", status);
sendIntent.putExtra("current", current);
// 发送广播 ，将被Activity组件中的BroadcastReceiver接收到
sendBroadcast(sendIntent);
}
}
private void prepareAndPlay(String music)
{
try
{
// 打开指定音乐文件
AssetFileDescriptor afd = am.openFd(music);
mPlayer.reset();
//使用MediaPlayer加载指定的声音文件。
mPlayer.setDataSource(afd.getFileDescriptor()
, afd.getStartOffset()
, afd.getLength());
// 准备声音
mPlayer.prepare();
// 播放
mPlayer.start();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
1：动态注册广播
activityReceiver = new ActivityReceiver();
// 创建IntentFilter
IntentFilter filter = new IntentFilter();
// 指定BroadcastReceiver监听的Action
filter.addAction(UPDATE_ACTION);
// 注册BroadcastReceiver
registerReceiver(activityReceiver, filter);
2：服务启动：
Intent intent = new Intent(this, MusicService.class);
// 启动后台Service
startService(intent);
3：服务的onCreate方法对音乐播放需要用的数据的初始化
public void onCreate()
{
am = getAssets();
// 创建BroadcastReceiver
serviceReceiver = new MyReceiver();
// 创建IntentFilter
IntentFilter filter = new IntentFilter();
filter.addAction(MusicBox.CTL_ACTION);
registerReceiver(serviceReceiver, filter);
// 创建MediaPlayer
mPlayer = new MediaPlayer();
// 为MediaPlayer播放完成事件绑定监听器
mPlayer.setOnCompletionListener(new OnCompletionListener()//media音乐播放完的监听
{//Register a callback to be invoked when the end of a media source has been reached during playback
@Override
public void onCompletion(MediaPlayer mp)
{
current++;
if (current >= 3)
{
current = 0;
}
/* 发送广播通知Activity更改文本框 */
Intent sendIntent = new Intent(MusicBox.UPDATE_ACTION);
sendIntent.putExtra("current", current);
// 发送广播 ，将被Activity组件中的BroadcastReceiver接收到
sendBroadcast(sendIntent);
// 准备、并播放音乐
prepareAndPlay(musics[current]);
}
});
super.onCreate();
}
服务一般处理这样的逻辑就是我们用户看不到的东西一般在各个地方我们都可以调用他就像是全局的
广播是处理这样的东西广播里主要有个onReceive方法所以我只能称他只是一个方法，但是这个方法有个特点在任何地方都可以调用他只要我们发送广播，他不仅仅能在我们应用的各个地方使用并且在我们应用程序不启动的时候其他应用也可以调用这个广播，广播可以帮我们节省内存空间，帮我们处理应用之间调用问题广播是全局的不仅仅在应用内