【郭林专刊】Android Music

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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1. <?xmlversion="1.0"encoding="utf-8"?>
2. <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
3. android:orientation="vertical"
4. android:layout_width="fill_parent"
5. android:layout_height="fill_parent"
6. >
7. <TextView
8. android:id="@+id/name"
9. android:layout_width="fill_parent"
10. android:layout_height="wrap_content"
11. />
12. <SeekBar
13. android:id="@+id/seekBar"
14. android:layout_width="fill_parent"
15. android:layout_height="wrap_content"
16. android:layout_marginBottom="5dp"
17. />
18. <LinearLayout
19. android:layout_width="fill_parent"
20. android:layout_height="wrap_content"
21. android:layout_marginBottom="20dp"
22. >
23. <Button
24. android:layout_width="40dp"
25. android:layout_height="40dp"
26. android:text="|◀"
27. android:onClick="previous"
28. />
29. <Button
30. android:id="@+id/pp"
31. android:layout_width="40dp"
32. android:layout_height="40dp"
33. android:text="▶"
34. android:onClick="pp"
35. />
36. <Button
37. android:layout_width="40dp"
38. android:layout_height="40dp"
39. android:text="▶|"
40. android:onClick="next"
41. />
42. </LinearLayout>
43. <ListView
44. android:id="@+id/list"
45. android:layout_width="fill_parent"
46. android:layout_height="fill_parent"
47. />
48. </LinearLayout>

<?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>

item.xml：

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1. <?xmlversion="1.0"encoding="utf-8"?>
2. <LinearLayout
3. xmlns:android="http://schemas.android.com/apk/res/android"
4. android:layout_width="fill_parent"
5. android:layout_height="wrap_content"
6. android:padding="10dp"
7. >
8. <TextView
9. android:id="@+id/mName"
10. android:layout_width="fill_parent"
11. android:layout_height="wrap_content"
12. android:textSize="15sp"
13. />
14. </LinearLayout>

<?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>

MainActivity:

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1. packagecn.test.audio;
3. importjava.io.File;
4. importjava.util.ArrayList;
5. importjava.util.Collections;
6. importjava.util.HashMap;
7. importjava.util.List;
8. importjava.util.Map;
10. importandroid.app.Activity;
11. importandroid.content.BroadcastReceiver;
12. importandroid.content.Context;
13. importandroid.content.Intent;
14. importandroid.content.IntentFilter;
15. importandroid.media.MediaPlayer;
16. importandroid.media.MediaPlayer.OnCompletionListener;
17. importandroid.os.Bundle;
18. importandroid.os.Environment;
19. importandroid.os.Handler;
20. importandroid.telephony.PhoneStateListener;
21. importandroid.telephony.TelephonyManager;
22. importandroid.view.View;
23. importandroid.widget.AdapterView;
24. importandroid.widget.Button;
25. importandroid.widget.ListView;
26. importandroid.widget.SeekBar;
27. importandroid.widget.SimpleAdapter;
28. importandroid.widget.TextView;
29. importandroid.widget.AdapterView.OnItemClickListener;
30. importandroid.widget.SeekBar.OnSeekBarChangeListener;
32. publicclassMainActivityextendsActivity{
33. privateTextViewnameTextView;
34. privateSeekBarseekBar;
35. privateListViewlistView;
36. privateList<Map<String,String>>data;
37. privateintcurrent;
38. privateMediaPlayerplayer;
39. privateHandlerhandler=newHandler();
40. privateButtonppButton;
41. privatebooleanisPause;
42. privatebooleanisStartTrackingTouch;
44. publicvoidonCreate(BundlesavedInstanceState){
45. super.onCreate(savedInstanceState);
46. setContentView(R.layout.main);
48. nameTextView=(TextView)findViewById(R.id.name);
49. seekBar=(SeekBar)findViewById(R.id.seekBar);
50. listView=(ListView)findViewById(R.id.list);
51. ppButton=(Button)findViewById(R.id.pp);
53. //创建一个音乐播放器
54. player=newMediaPlayer();
56. //显示音乐播放列表
57. generateListView();
59. //进度条监听器
60. seekBar.setOnSeekBarChangeListener(newMySeekBarListener());
62. //播放器监听器
63. player.setOnCompletionListener(newMyPlayerListener());
65. //意图过滤器
66. IntentFilterfilter=newIntentFilter();
68. //播出电话暂停音乐播放
69. filter.addAction("android.intent.action.NEW_OUTGOING_CALL");
70. registerReceiver(newPhoneListener(),filter);
72. //创建一个电话服务
73. TelephonyManagermanager=(TelephonyManager)getSystemService(TELEPHONY_SERVICE);
75. //监听电话状态，接电话时停止播放
76. manager.listen(newMyPhoneStateListener(),PhoneStateListener.LISTEN_CALL_STATE);
77. }
79. /*
80. *监听电话状态
81. */
82. privatefinalclassMyPhoneStateListenerextendsPhoneStateListener{
83. publicvoidonCallStateChanged(intstate,StringincomingNumber){
84. pause();
85. }
86. }
88. /*
89. *播放器监听器
90. */
91. privatefinalclassMyPlayerListenerimplementsOnCompletionListener{
92. //歌曲播放完后自动播放下一首歌曲
93. publicvoidonCompletion(MediaPlayermp){
94. next();
95. }
96. }
98. /*
99. *下一首按钮
100. */
101. publicvoidnext(Viewview){
102. next();
103. }
105. /*
106. *前一首按钮
107. */
108. publicvoidprevious(Viewview){
109. previous();
110. }
112. /*
113. *播放前一首歌
114. */
115. privatevoidprevious(){
116. current=current-1<0?data.size()-1:current-1;
117. play();
118. }
120. /*
121. *播放下一首歌
122. */
123. privatevoidnext(){
124. current=(current+1)%data.size();
125. play();
126. }
128. /*
129. *进度条监听器
130. */
131. privatefinalclassMySeekBarListenerimplementsOnSeekBarChangeListener{
132. //移动触发
133. publicvoidonProgressChanged(SeekBarseekBar,intprogress,booleanfromUser){
134. }
136. //起始触发
137. publicvoidonStartTrackingTouch(SeekBarseekBar){
138. isStartTrackingTouch=true;
139. }
141. //结束触发
142. publicvoidonStopTrackingTouch(SeekBarseekBar){
143. player.seekTo(seekBar.getProgress());
144. isStartTrackingTouch=false;
145. }
146. }
148. /*
149. *显示音乐播放列表
150. */
151. privatevoidgenerateListView(){
152. List<File>list=newArrayList<File>();
154. //获取sdcard中的所有歌曲
155. findAll(Environment.getExternalStorageDirectory(),list);
157. //播放列表进行排序，字符顺序
158. Collections.sort(list);
160. data=newArrayList<Map<String,String>>();
161. for(Filefile:list){
162. Map<String,String>map=newHashMap<String,String>();
163. map.put("name",file.getName());
164. map.put("path",file.getAbsolutePath());
165. data.add(map);
166. }
168. SimpleAdapteradapter=newSimpleAdapter(this,data,R.layout.item,newString[]{"name"},newint[]{R.id.mName});
169. listView.setAdapter(adapter);
171. listView.setOnItemClickListener(newMyItemListener());
172. }
174. privatefinalclassMyItemListenerimplementsOnItemClickListener{
175. publicvoidonItemClick(AdapterView<?>parent,Viewview,intposition,longid){
176. current=position;
177. play();
178. }
179. }
182. privatevoidplay(){
183. try{
184. //重播
185. player.reset();
187. //获取歌曲路径
188. player.setDataSource(data.get(current).get("path"));
190. //缓冲
191. player.prepare();
193. //开始播放
194. player.start();
196. //显示歌名
197. nameTextView.setText(data.get(current).get("name"));
199. //设置进度条长度
200. seekBar.setMax(player.getDuration());
202. //播放按钮样式
203. ppButton.setText("||");
205. //发送一个Runnable,handler收到之后就会执行run()方法
206. handler.post(newRunnable(){
207. publicvoidrun(){
208. //更新进度条状态
209. if(!isStartTrackingTouch)
210. seekBar.setProgress(player.getCurrentPosition());
211. //1秒之后再次发送
212. handler.postDelayed(this,1000);
213. }
214. });
215. }catch(Exceptione){
216. e.printStackTrace();
217. }
218. }
220. /**
221. *查找文件路径中所有mp3文件
222. *@paramfile要找的目录
223. *@paramlist用来装文件的List
224. */
225. privatevoidfindAll(Filefile,List<File>list){
226. File[]subFiles=file.listFiles();
227. if(subFiles!=null)
228. for(FilesubFile:subFiles){
229. if(subFile.isFile()&&subFile.getName().endsWith(".mp3"))
230. list.add(subFile);
231. elseif(subFile.isDirectory())//如果是目录
232. findAll(subFile,list);//递归
233. }
234. }
236. /*
237. *暂停/播放按钮
238. */
239. publicvoidpp(Viewview){
241. //默认从第一首歌曲开始播放
242. if(!player.isPlaying()&&!isPause){
243. play();
244. return;
245. }
247. Buttonbutton=(Button)view;
248. //暂停/播放按钮
249. if("||".equals(button.getText())){
250. pause();
251. button.setText("▶");
252. }else{
253. resume();
254. button.setText("||");
255. }
256. }
258. /*
259. *开始操作
260. */
261. privatevoidresume(){
262. if(isPause){
263. player.start();
264. isPause=false;
265. }
266. }
268. /*
269. *暂停操作
270. */
271. privatevoidpause(){
272. if(player!=null&&player.isPlaying()){
273. player.pause();
274. isPause=true;
275. }
276. }
278. /*
279. *收到广播时暂停
280. */
281. privatefinalclassPhoneListenerextendsBroadcastReceiver{
282. publicvoidonReceive(Contextcontext,Intentintent){
283. pause();
284. }
285. }
287. /*
288. *恢复播放
289. *@seeandroid.app.Activity#onResume()
290. */
291. protectedvoidonResume(){
292. super.onResume();
293. resume();
294. }
295. }

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(); } }

注册权限：

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1. <?xmlversion="1.0"encoding="utf-8"?>
2. <manifestxmlns:android="http://schemas.android.com/apk/res/android"
3. package="cn.itcast.audio"
4. android:versionCode="1"
5. android:versionName="1.0">
6. <applicationandroid:icon="@drawable/icon"android:label="@string/app_name">
7. <activityandroid:name=".MainActivity"
8. android:label="@string/app_name">
9. <intent-filter>
10. <actionandroid:name="android.intent.action.MAIN"/>
11. <categoryandroid:name="android.intent.category.LAUNCHER"/>
12. </intent-filter>
13. </activity>
15. </application>
16. <uses-sdkandroid:minSdkVersion="8"/>
18. <!--监听电话呼出-->
19. <uses-permissionandroid:name="android.permission.PROCESS_OUTGOING_CALLS"/>
20. <!--监听电话状态改变-->
21. <uses-permissionandroid:name="android.permission.READ_PHONE_STATE"/>
23. </manifest>

<?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>

非常反感源码 但是还是共享一下 帮助大家共同学习。。。。。