Android中从SD卡中读取歌曲

Posted 2020-09-29 眼泪，还是流了

先看看我的效果图吧

 

 

Activity类

  1         private TextView nameTextView;  
  2     private SeekBar seekBar;  
  3     private ListView listView;  
  4     private List<Map<String, String>> data;  
  5     private int current;  
  6     private MediaPlayer player;  
  7     private Handler handler = new Handler();  
  8     private Button ppButton;  
  9     private boolean isPause;  
 10     private boolean isStartTrackingTouch;    
 11         protected void onCreate(Bundle savedInstanceState) {
 12         super.onCreate(savedInstanceState);
 13         setContentView(R.layout.mainb);
 14                 ib3=(ImageButton) findViewById(R.id.ib3);
 15         ib3.setOnClickListener(new OnClickListener() {
 16             @Override
 17             public void onClick(View v) {
 18                 Intent it=new Intent(Music_b.this,Music_gc.class);
 19                 String name=data.get(current).get("name");
 20                 it.putExtra("name", name);
 21                 startActivityForResult(it, 1);
 22             }
 23         });
 24         tv=(TextView)findViewById(R.id.tvbb);
 25         sp=(Spinner) findViewById(R.id.sp);
 26         sp.setOnItemSelectedListener(new OnItemSelectedListener() {
 27             @Override
 28             public void onItemSelected(AdapterView<?> arg0, View view,
 29                     int arg2, long arg3) {
 30                 TextView tv1=(TextView)view;
 31                 String str=tv1.getText().toString();
 32                 tv.setText(str);
 33             }
 34             @Override
 35             public void onNothingSelected(AdapterView<?> arg0) {
 36             }
 37         });
 38         sp1=(Spinner) findViewById(R.id.sp1);
 39         sp1.setOnItemSelectedListener(new OnItemSelectedListener() {
 40 
 41             @Override
 42             public void onItemSelected(AdapterView<?> arg0, View view,
 43                     int arg2, long arg3) {
 44                 TextView tv1=(TextView)view;
 45                 String str=tv1.getText().toString();
 46                 tv.setText(str);
 47             }
 48             @Override
 49             public void onNothingSelected(AdapterView<?> arg0) {
 50                 
 51             }
 52         });
 53             nameTextView = (TextView) findViewById(R.id.name);  
 54         seekBar = (SeekBar) findViewById(R.id.seekBar);  
 55         listView = (ListView) findViewById(R.id.list);  
 56         ppButton = (Button) findViewById(R.id.pp);  
 57         //创建一个音乐播放器
 58         player = new MediaPlayer();  
 59         //显示音乐播放器   
 60         generateListView();  
 61         //进度条监听器   
 62         seekBar.setOnSeekBarChangeListener(new MySeekBarListener());    
 63         //播放器监听器   
 64         player.setOnCompletionListener(new MyPlayerListener()); 
 65         //意图过滤器   
 66         IntentFilter filter = new IntentFilter();  
 67     }  
 68     private final class MyPlayerListener implements OnCompletionListener {  
 69         //歌曲播放完后自动播放下一首歌区
 70         public void onCompletion(MediaPlayer mp) {  
 71             next();  
 72         }  
 73     }  
 74     public void next(View view) {  
 75         next();  
 76     }  
 77     public void previous(View view) {  
 78         previous();  
 79     }  
 80     private void previous() {  
 81         current = current - 1 < 0 ? data.size() - 1 : current - 1;  
 82         play();  
 83     }  
 84     private void next() {  
 85         current = (current + 1) % data.size();  
 86         play();  
 87     }  
 88     private final class MySeekBarListener implements OnSeekBarChangeListener {  
 89         //移动触发   
 90         public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {  
 91         }  
 92         //起始触发  
 93         public void onStartTrackingTouch(SeekBar seekBar) {  
 94             isStartTrackingTouch = true;  
 95         }  
 96         //结束触发  
 97         public void onStopTrackingTouch(SeekBar seekBar) {  
 98             player.seekTo(seekBar.getProgress());  
 99             isStartTrackingTouch = false;  
100         }  
101     }  
102     private void generateListView() {  
103         List<File> list = new ArrayList<File>();  
104         //获取sdcard中的所有歌曲   
105         findAll(Environment.getExternalStorageDirectory(), list);  
106         //播放列表进行排序，字符顺序  
107         Collections.sort(list);  
108         data = new ArrayList<Map<String, String>>();  
109         for (File file : list) {  
110             Map<String, String> map = new HashMap<String, String>();  
111             map.put("name", file.getName());  
112             map.put("path", file.getAbsolutePath());  
113             data.add(map);  
114         }  
115         SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.mainmp3_item, new String[] { "name" }, new int[] { R.id.mName });  
116         listView.setAdapter(adapter);  
117         listView.setOnItemClickListener(new MyItemListener());  
118     }  
119     private final class MyItemListener implements OnItemClickListener {  
120         public void onItemClick(AdapterView<?> parent, View view, int position, long id) {  
121             current = position;  
122             play();  
123         }  
124     }  
125     private void play() {  
126         try {  
127             //重播
128             player.reset();  
129             //获取歌曲路径
130             player.setDataSource(data.get(current).get("path"));  
131             //缓冲  
132             player.prepare();
133             //开始播放   
134             player.start();  
135             //显示歌名   
136             nameTextView.setText(data.get(current).get("name"));  
137             //设置进度条长度   
138             seekBar.setMax(player.getDuration());  
139             //播放按钮样式   
140             ppButton.setText("||");  
141             //发送一个Runnable，handler收到之后就会执行run()方法
142             handler.post(new Runnable() {  
143                 public void run() {  
144                     // 更新进度条状态  
145                     if (!isStartTrackingTouch)  
146                         seekBar.setProgress(player.getCurrentPosition());  
147                     // 1秒之后再次发送
148                     handler.postDelayed(this, 1000);  
149                 }  
150             });  
151         } catch (Exception e) {  
152             e.printStackTrace();  
153         }  
154     }  
155     private void findAll(File file, List<File> list) {  
156         File[] subFiles = file.listFiles();  
157         if (subFiles != null)  
158             for (File subFile : subFiles) {  
159                 if (subFile.isFile() && subFile.getName().endsWith(".mp3"))  
160                     list.add(subFile);  
161                 else if (subFile.isDirectory())//如果是目录   
162                     findAll(subFile, list); //递归
163             }  
164     }  
165     public void pp(View view) {  
166         //默认从第一首歌开始播放
167         if (!player.isPlaying() && !isPause) {  
168             play();  
169             return;  
170         }  
171         Button button = (Button) view;  
172         //暂停/播放按钮 
173         if ("||".equals(button.getText())) {  
174             pause();  
175             button.setText("|>");  
176         }else if("|>".equals(button.getText())) {  
177             resume();  
178             button.setText("||");  
179         }
180     }  
181     private void resume() {  
182         if (isPause) {  
183             player.start();  
184             isPause = false;  
185         }  
186     }  
187     private void pause() {  
188         if (player != null && player.isPlaying()) {  
189             player.pause();  
190             isPause = true;  
191         }  
192         }  
193         } 

示例代码

xml类

 

 1 <TableLayout
 2         android:orientation="vertical"
 3         android:layout_width="match_parent"
 4         android:layout_height="wrap_content">
 5         <TableRow>
 6             <ListView  
 7                 android:id="@+id/list"  
 8                   android:layout_width="wrap_content"   
 9                   android:layout_height="fill_parent"  
10             />
11         </TableRow>
12     </TableLayout>
13     <TextView    
14        android:id="@+id/name"  
15        android:layout_width="wrap_content"   
16        android:layout_height="wrap_content"
17        android:layout_marginTop="50px"
18      /> 
19     <RelativeLayout
20         android:layout_width="fill_parent"
21         android:layout_height="wrap_content"
22         >
23         <ImageButton
24             android:id="@+id/ib3"
25             android:layout_width="wrap_content"
26              android:layout_height="wrap_content"
27              android:src="@drawable/b"
28              android:background="#00000000"
29             android:layout_alignParentBottom="true"
30         />
31         <SeekBar 
32             android:id="@+id/seekBar"  
33             style="?android:attr/progressBarStyleHorizontal"  
34             android:layout_width="fill_parent"  
35             android:layout_height="wrap_content"  
36             android:paddingLeft="88dip"
37             android:progressDrawable="@drawable/seekbar"     
38             android:thumb="@drawable/thumb"
39             android:layout_alignTop="@id/ib3"
40             android:max="100"
41             android:maxHeight="2.0dip"
42             android:minHeight="2.0dip"
43           /> 
44         <Button  
45             android:id="@+id/bt021"
46             android:layout_width="wrap_content"   
47             android:layout_height="wrap_content"   
48             android:text="|?"  
49             android:onClick="previous"
50             android:layout_toRightOf="@id/ib3"
51             android:background="#00000000"
52             android:layout_marginRight="30px"
53             android:paddingLeft="20dip"
54             android:layout_alignParentBottom="true"           
55         />  
56         <Button  
57             android:id="@+id/pp"  
58             android:layout_width="wrap_content"   
59             android:layout_height="wrap_content"   
60             android:text="?"  
61             android:onClick="pp"
62             android:layout_toRightOf="@id/bt021"
63             android:background="#00000000"
64             android:layout_marginRight="30px"
65             android:layout_alignParentBottom="true"
66         />  
67         <Button  
68               android:layout_width="wrap_content"   
69             android:layout_height="wrap_content"   
70             android:text="?|"  
71             android:onClick="next"  
72             android:layout_toRightOf="@id/pp"
73             android:background="#00000000"
74             android:layout_marginTop="20dip"
75             android:layout_alignParentBottom="true"
76         />
77      </RelativeLayout>

示例代码

 

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="horizontal"
 4     android:layout_width="fill_parent"
 5     android:layout_height="fill_parent"
 6     android:background="#FFFFFF"
 7     >
 8     <TableLayout
 9         android:orientation="vertical"
10         android:layout_width="match_parent"
11         android:layout_height="wrap_content">
12         <TableRow>
13             <TextView  
14                 android:id="@+id/textview"
15                 android:layout_width="fill_parent" 
16                 android:layout_height="wrap_content" 
17                 />
18         </TableRow>
19     </TableLayout>
20     
21 </LinearLayout>

第二个xml