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  • Android中从SD卡中读取歌曲

    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
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  • 原文地址:https://www.cnblogs.com/yang82/p/7214559.html
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