從SD卡加載多個音頻文件

Question

我需要關於如何從SD卡上的特定文件夾加載多個音頻文件並讓它播放隨機文件的幫助/指向文檔/示例代碼的指針（我想我可以弄清楚最後一步，如果我可以弄清楚如何加載多個文件）。到目前爲止，這是我寫得非常差的應用程序，不要像我一直在學習時那樣苛刻地判斷。

public class zazenbox extends Activity implements OnClickListener{ 

File filecheck; 
MediaPlayer player; 
Button playerButton; 
Integer var1; 
String path1; 
AlertDialog.Builder alertbox; 

public void onClick(View v) { 
    if (v.getId() == R.id.play) { 
     playPause(); 
    } 
} 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    demoLoad(); 

    playerButton = (Button) this.findViewById(R.id.play); 
    playerButton.setText(R.string.stop); 
    playerButton.setOnClickListener(this); 

    demoPlay(); 
} 

@Override 
public void onPause() { 
    super.onPause(); 
    player.pause(); 
} 

@Override 
public void onStop() { 
    super.onStop(); 
    player.stop(); 
} 

private void demoLoad() { 

    dirfilecheck(); 

    player = new MediaPlayer(); 
    player.setLooping(true); 
    try { 
     player.setDataSource(path1); 
     player.prepare(); 
    } 
    catch (IOException e) { e.printStackTrace(); } 
    catch (IllegalArgumentException e) { e.printStackTrace(); } 
    catch (IllegalStateException e) { e.printStackTrace(); } 
} 

private void dirfilecheck() { 
    filecheck = new File(Environment.getExternalStorageDirectory() + "/zazenbox"); 

    if(filecheck.exists() && filecheck.isDirectory()) { 
     // load files. 
     var1 = 1; 
     path1 = filecheck + "/bm10" + var1 + ".wav"; 
    } else { 
     // create folder, dl sample loop, and instruct user how to add music/loops. 
     filecheck.mkdirs(); 
     alertbox = new AlertDialog.Builder(this); 
     alertbox.setMessage("Please put loopable media in zazenbox on your sdcard."); 
     alertbox.setNeutralButton("Ok, I will.", new DialogInterface.OnClickListener() { 

      public void onClick(DialogInterface arg0, int arg1) { 
       Toast.makeText(getApplicationContext(), "Please plug in your device now", Toast.LENGTH_LONG).show(); 
      } 
     }); 

     alertbox.show(); 
    } 
} 

private void demoPause() { 
    player.pause(); 
    playerButton.setText(R.string.play); 
} 

private void demoStop() { 
    player.stop(); 
    playerButton.setText(R.string.play); 
} 


private void demoPlay() { 
    player.start(); 
    playerButton.setText(R.string.stop); 
} 

private void playPause() { 
    if(player.isPlaying()) { 
     demoStop(); 
     //demoPause(); 
     //player.release(); 
     var1++; 
     path1 = filecheck + "/bm10" + var1 + ".wav"; 
     /*try { 
      player.setDataSource(path1); 
      player.prepare(); 
     } 
     catch (IOException e) { e.printStackTrace(); } 
     catch (IllegalArgumentException e) { e.printStackTrace(); } 
     catch (IllegalStateException e) { e.printStackTrace(); }*/ 
     //player.start(); 
     //demoPlay(); 
    } else { 
     //do stuff 
     demoPlay(); 
    } 
} 

}

Answer 1

內存非常有限時在移動設備上，這樣你就不會想加載你不會播放歌曲。所以你應該做的是找到該文件夾​​中的所有音頻文件，然後選擇一個，然後加載並播放它。

您只需要停止當前播放器並創建一個新實例。

MediaPlayer player = MediaPlayer.create(this, Uri.parse("Path/To/Media")); 
player.start(); 
// change track 
player.stop(); 
player = MediaPlayer.create(this, Uri.parse("New/Path/To/Media")); 
player.start();