本文实例讲述了android编程开发音乐播放器,分享给大家供大家参考,具体如下:
音乐播放器中综合了以下内容:
seekbar、listview、广播接收者(以代码的形式注册receiver)、系统服务、mediaplayer
实现的功能:
1.暂停/播放、下一首/上一首,点击某一首时播放
2.支持拖动进度条快进
3.列表排序
4.来电话时,停止播放,挂断后继续播放
5.可在后台播放
效果图:
界面:
main.xml:
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<?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/name"
android:layout_width= "fill_parent"
android:layout_height= "wrap_content"
/>
<seekbar
android:id= "@+id/seekbar"
android:layout_width= "fill_parent"
android:layout_height= "wrap_content"
android:layout_marginbottom= "5dp"
/>
<linearlayout
android:layout_width= "fill_parent"
android:layout_height= "wrap_content"
android:layout_marginbottom= "20dp"
>
<button
android:layout_width= "40dp"
android:layout_height= "40dp"
android:text= "|◀"
android:onclick= "previous"
/>
<button
android:id= "@+id/pp"
android:layout_width= "40dp"
android:layout_height= "40dp"
android:text= "▶"
android:onclick= "pp"
/>
<button
android:layout_width= "40dp"
android:layout_height= "40dp"
android:text= "▶|"
android:onclick= "next"
/>
</linearlayout>
<listview
android:id= "@+id/list"
android:layout_width= "fill_parent"
android:layout_height= "fill_parent"
/>
</linearlayout>
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item.xml:
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<?xml version= "1.0" encoding= "utf-8" ?>
<linearlayout
xmlns:android= "http://schemas.android.com/apk/res/android"
android:layout_width= "fill_parent"
android:layout_height= "wrap_content"
android:padding= "10dp"
>
<textview
android:id= "@+id/mname"
android:layout_width= "fill_parent"
android:layout_height= "wrap_content"
android:textsize= "15sp"
/>
</linearlayout>
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mainactivity:
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package cn.test.audio;
import java.io.file;
import java.util.arraylist;
import java.util.collections;
import java.util.hashmap;
import java.util.list;
import java.util.map;
import android.app.activity;
import android.content.broadcastreceiver;
import android.content.context;
import android.content.intent;
import android.content.intentfilter;
import android.media.mediaplayer;
import android.media.mediaplayer.oncompletionlistener;
import android.os.bundle;
import android.os.environment;
import android.os.handler;
import android.telephony.phonestatelistener;
import android.telephony.telephonymanager;
import android.view.view;
import android.widget.adapterview;
import android.widget.button;
import android.widget.listview;
import android.widget.seekbar;
import android.widget.simpleadapter;
import android.widget.textview;
import android.widget.adapterview.onitemclicklistener;
import android.widget.seekbar.onseekbarchangelistener;
public class mainactivity extends activity {
private textview nametextview;
private seekbar seekbar;
private listview listview;
private list<map<string, string>> data;
private int current;
private mediaplayer player;
private handler handler = new handler();
private button ppbutton;
private boolean ispause;
private boolean isstarttrackingtouch;
public void oncreate(bundle savedinstancestate) {
super .oncreate(savedinstancestate);
setcontentview(r.layout.main);
nametextview = (textview) findviewbyid(r.id.name);
seekbar = (seekbar) findviewbyid(r.id.seekbar);
listview = (listview) findviewbyid(r.id.list);
ppbutton = (button) findviewbyid(r.id.pp);
//创建一个音乐播放器
player = new mediaplayer();
//显示音乐播放列表
generatelistview();
//进度条监听器
seekbar.setonseekbarchangelistener( new myseekbarlistener());
//播放器监听器
player.setoncompletionlistener( new myplayerlistener());
//意图过滤器
intentfilter filter = new intentfilter();
//播出电话暂停音乐播放
filter.addaction( "android.intent.action.new_outgoing_call" );
registerreceiver( new phonelistener(), filter);
//创建一个电话服务
telephonymanager manager = (telephonymanager) getsystemservice(telephony_service);
//监听电话状态,接电话时停止播放
manager.listen( new myphonestatelistener(), phonestatelistener.listen_call_state);
}
/*
* 监听电话状态
*/
private final class myphonestatelistener extends phonestatelistener {
public void oncallstatechanged(int state, string incomingnumber) {
pause();
}
}
/*
* 播放器监听器
*/
private final class myplayerlistener implements oncompletionlistener {
//歌曲播放完后自动播放下一首歌曲
public void oncompletion(mediaplayer mp) {
next();
}
}
/*
* 下一首按钮
*/
public void next(view view) {
next();
}
/*
* 前一首按钮
*/
public void previous(view view) {
previous();
}
/*
* 播放前一首歌
*/
private void previous() {
current = current - 1 < 0 ? data.size() - 1 : current - 1;
play();
}
/*
* 播放下一首歌
*/
private void next() {
current = (current + 1) % data.size();
play();
}
/*
* 进度条监听器
*/
private final class myseekbarlistener implements onseekbarchangelistener {
//移动触发
public void onprogresschanged(seekbar seekbar, int progress, boolean fromuser) {
}
//起始触发
public void onstarttrackingtouch(seekbar seekbar) {
isstarttrackingtouch = true;
}
//结束触发
public void onstoptrackingtouch(seekbar seekbar) {
player.seekto(seekbar.getprogress());
isstarttrackingtouch = false;
}
}
/*
* 显示音乐播放列表
*/
private void generatelistview() {
list<file> list = new arraylist<file>();
//获取sdcard中的所有歌曲
findall(environment.getexternalstoragedirectory(), list);
//播放列表进行排序,字符顺序
collections.sort(list);
data = new arraylist<map<string, string>>();
for (file file : list) {
map<string, string> map = new hashmap<string, string>();
map.put("name", file.getname());
map.put("path", file.getabsolutepath());
data.add(map);
}
simpleadapter adapter = new simpleadapter(this, data, r.layout.item, new string[] { "name" }, new int[] { r.id.mname });
listview.setadapter(adapter);
listview.setonitemclicklistener(new myitemlistener());
}
private final class myitemlistener implements onitemclicklistener {
public void onitemclick(adapterview<?> parent, view view, int position, long id) {
current = position;
play();
}
}
private void play() {
try {
//重播
player.reset();
//获取歌曲路径
player.setdatasource(data.get(current).get("path"));
//缓冲
player.prepare();
//开始播放
player.start();
//显示歌名
nametextview.settext(data.get(current).get("name"));
//设置进度条长度
seekbar.setmax(player.getduration());
//播放按钮样式
ppbutton.settext("||");
//发送一个runnable, handler收到之后就会执行run()方法
handler.post(new runnable() {
public void run() {
// 更新进度条状态
if (!isstarttrackingtouch)
seekbar.setprogress(player.getcurrentposition());
// 1秒之后再次发送
handler.postdelayed(this, 1000);
}
});
} catch (exception e) {
e.printstacktrace();
}
}
/**
* 查找文件路径中所有mp3文件
* @param file 要找的目录
* @param list 用来装文件的list
*/
private void findall(file file, list<file> list) {
file[] subfiles = file.listfiles();
if (subfiles != null)
for (file subfile : subfiles) {
if (subfile.isfile() && subfile.getname().endswith(".mp3"))
list.add(subfile);
else if (subfile.isdirectory())//如果是目录
findall(subfile, list); //递归
}
}
/*
* 暂停/播放按钮
*/
public void pp(view view) {
//默认从第一首歌曲开始播放
if (!player.isplaying() && !ispause) {
play();
return;
}
button button = (button) view;
//暂停/播放按钮
if ("||".equals(button.gettext())) {
pause();
button.settext("▶");
} else {
resume();
button.settext("||");
}
}
/*
* 开始操作
*/
private void resume() {
if (ispause) {
player.start();
ispause = false;
}
}
/*
* 暂停操作
*/
private void pause() {
if (player != null && player.isplaying()) {
player.pause();
ispause = true;
}
}
/*
* 收到广播时暂停
*/
private final class phonelistener extends broadcastreceiver {
public void onreceive(context context, intent intent) {
pause();
}
}
/*
* 恢复播放
* @see android.app.activity#onresume()
*/
protected void onresume() {
super .onresume();
resume();
}
}
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注册权限:
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<?xml version= "1.0" encoding= "utf-8" ?>
<manifest xmlns:android= "http://schemas.android.com/apk/res/android"
package = "cn.itcast.audio"
android:versioncode= "1"
android:versionname= "1.0" >
<application android:icon= "@drawable/icon" android:label= "@string/app_name" >
<activity android:name= ".mainactivity"
android:label= "@string/app_name" >
<intent-filter>
<action android:name= "android.intent.action.main" />
<category android:name= "android.intent.category.launcher" />
</intent-filter>
</activity>
</application>
<uses-sdk android:minsdkversion= "8" />
<!-- 监听电话呼出 -->
<uses-permission android:name= "android.permission.process_outgoing_calls" />
<!-- 监听电话状态改变 -->
<uses-permission android:name= "android.permission.read_phone_state" />
</manifest>
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希望本文所述对大家android程序设计有所帮助。