SoundPool加载速度慢，并且在MotionEvent方面表现奇怪。

huangapple
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英文:

SoundPool loads slowly and is weird with MotionEvent

问题

  1. public class MainActivityPiano extends AppCompatActivity {
  3.     //所有声音ID
  4.     public static final int SOUND_1 = 1;
  5.     public static final int SOUND_2 = 2;
  7.     SoundPool mSoundPool;
  8.     HashMap<Integer, Integer> mSoundMap;
  10.     static int streamID;
  12.     @Override
  13.     protected void onStart() {
  14.         super.onStart();
  15.         
  16.         mSoundPool = new SoundPool(4, AudioManager.STREAM_MUSIC, 100);
  17.         mSoundMap = new HashMap<Integer, Integer>();
  19.         if(mSoundPool != null){
  20.             mSoundMap.put(SOUND_1, mSoundPool.load(this, R.raw.piano_tone1, 1));
  21.             mSoundMap.put(SOUND_2, mSoundPool.load(this, R.raw.piano_tone2, 1));
  22.             //至少要加载十二个不同的声音文件...
  23.         }
  25.         //播放按钮和/或钢琴键
  26.         Button pianoKey1 = this.findViewById(R.id.piano_key1);
  27.         Button pianoKey2 = this.findViewById(R.id.piano_key2);
  28.         //...
  30.         //播放按钮和/或钢琴键
  31.         pianoKey1.setOnTouchListener(new View.OnTouchListener() {
  32.             public boolean onTouch(View view, MotionEvent motionEvent) {
  33.                 return playSound(SOUND_1, motionEvent, view);
  34.             }
  35.         });
  36.         pianoKey2.setOnTouchListener(new View.OnTouchListener() {
  37.             public boolean onTouch(View view, MotionEvent motionEvent) {
  38.                 return playSound(SOUND_2, motionEvent, view);
  39.             }
  40.         });
  41.         //...
  42.     }
  44.     @Override
  45.     protected void onCreate(Bundle savedInstanceState) {
  46.         super.onCreate(savedInstanceState);
  47.         setContentView(R.layout.layout_piano);
  48.     }
  50.     public boolean playSound(int sound, MotionEvent m, View v) {
  52.         switch (m.getAction()) {
  53.             case MotionEvent.ACTION_DOWN:
  54.                 streamID = mSoundPool.play(sound, 1, 1, 1, 0, 1.0f);
  55.                 break;
  57.             case MotionEvent.ACTION_CANCEL:;
  58.                 mSoundPool.stop(streamID);
  59.                 break;
  60.                 
  61.             case MotionEvent.ACTION_UP:
  62.                 mSoundPool.stop(streamID);
  63.                 break;
  65.             case MotionEvent.ACTION_MOVE:
  66.         }
  67.         return true;
  68.     }
  70.     @Override
  71.     protected void onPause() {
  72.         mSoundPool.autoPause();
  73.         super.onPause();
  74.     }
  76. }
英文:

Hi!
I'm fairly new to programming and I've run into some issues with SoundPool.
I'm trying to build a simple piano application and haven't found a solution yet. The audio files I'm using are midi (.mid)

Current issues with my code:

  • Audio files load very slow, I have to wait a couple of seconds for SOUND_12 to get ready.
  • It works fine if I only use one finger, but when I add another finger the first finger/sound gets stuck.

My current code:

  2. public class MainActivityPiano extends AppCompatActivity {
  3. //all soundIDs
  4. public static final int SOUND_1 = 1;
  5. public static final int SOUND_2 = 2;
  6. SoundPool mSoundPool;
  7. HashMap&lt;Integer, Integer&gt; mSoundMap;
  8. static int streamID;
  9. @Override
  10. protected void onStart() {
  11. super.onStart();
  12. mSoundPool = new SoundPool(4, AudioManager.STREAM_MUSIC, 100);
  13. mSoundMap = new HashMap&lt;Integer, Integer&gt;();
  14. if(mSoundPool != null){
  15. mSoundMap.put(SOUND_1, mSoundPool.load(this, R.raw.piano_tone1, 1));
  16. mSoundMap.put(SOUND_2, mSoundPool.load(this, R.raw.piano_tone2, 1));
  17. //at least twelve different sound files have to be loaded...
  18. }
  19. //play buttons and/or piano keys
  20. Button pianoKey1 = this.findViewById(R.id.piano_key1);
  21. Button pianoKey2 = this.findViewById(R.id.piano_key2);
  22. //...
  23. //play buttons and/or pianokeys
  24. pianoKey1.setOnTouchListener(new View.OnTouchListener() {
  25. public boolean onTouch(View view, MotionEvent motionEvent) {
  26. return playSound(SOUND_1, motionEvent, view);
  27. }
  28. });
  29. pianoKey2.setOnTouchListener(new View.OnTouchListener() {
  30. public boolean onTouch(View view, MotionEvent motionEvent) {
  31. return playSound(SOUND_2, motionEvent, view);
  32. }
  33. });
  34. //...
  35. }
  36. @Override
  37. protected void onCreate(Bundle savedInstanceState) {
  38. super.onCreate(savedInstanceState);
  39. setContentView(R.layout.layout_piano);
  40. }
  41. public boolean playSound(int sound, MotionEvent m, View v) {
  42. switch (m.getAction()) {
  43. case MotionEvent.ACTION_DOWN:
  44. streamID = mSoundPool.play(sound, 1, 1, 1, 0, 1.0f);
  45. break;
  46. case MotionEvent.ACTION_CANCEL:;
  47. mSoundPool.stop(streamID);
  48. break;
  49. case MotionEvent.ACTION_UP:
  50. mSoundPool.stop(streamID);
  51. break;
  52. case MotionEvent.ACTION_MOVE:
  53. }
  54. return true;
  55. }
  56. @Override
  57. protected void onPause() {
  58. mSoundPool.autoPause();
  59. super.onPause();
  60. }
  61. }

答案1

得分: 2

你可能想要预先加载你的声音，然后通过引用它们的ID来播放。

short[] 数组将包含你传递给 getSound() 的 fileNames 中对应文件的ID。

创建一个单独的类 Sound.java：
在你的主活动中，你可以创建一个 Sound 对象，并在 onCreate() 中加载声音，然后通过它们的ID播放。

  1. public class Sound {
  2. 	private static SoundPool soundPool;
  3. 	
  4. 	public short[] getSound(Activity activity, String...fileNames) {
  5. 		soundPool = new SoundPool(10, AudioManager.STREAM_MUSIC, 0);
  6. 		short[] ids = new short[fileNames.length];
  7. 		activity.setVolumeControlStream(AudioManager.STREAM_MUSIC);
  8. 		try {
  9. 			AssetManager assetManager = activity.getAssets();
  10. 			for(int i = 0; i < fileNames.length; i++) {
  11. 				AssetFileDescriptor descriptor = assetManager.openFd(fileNames[i]);
  12. 				ids[i] = (short) soundPool.load(descriptor, 1);
  13. 			}
  14. 		} catch(IOException e) {
  15. 			//
  16. 		}
  17. 		return ids;
  18. 	}
  19. 	
  20. 	public void playSound(short id, float rV, float lV) {
  21. 		if(id != -1) {
  22. 			soundPool.play(id, rV, lV, 0, 0, 1);
  23. 		}
  24. 	}
  25. 	
  26. 	public void pauseSound() {
  27. 		soundPool.autoPause();
  28. 	}	
  29. 	
  30. 	public void releaseSound() {
  31. 		soundPool.release();
  32. 	}
  33. }
英文:

You probably want to pre-load your sounds and then play them by referencing their ids.

The short[] array will contain ids for the corresponding file in the fileNames that you pass to getSound()

Create a separate class Sound.java:
In your Main Activity you can create a Sound object and load the sounds once in onCreate() and play them with their ids.

  1. public class Sound {
  2. private static SoundPool soundPool;
  3. public short[] getSound(Activity activity, String...fileNames) {
  4. soundPool = new SoundPool(10, AudioManager.STREAM_MUSIC, 0);
  5. short[] ids = new short[fileNames.length];
  6. activity.setVolumeControlStream(AudioManager.STREAM_MUSIC);
  7. try {
  8. AssetManager assetManager = activity.getAssets();
  9. for(int i = 0; i &lt; fileNames.length; i++) {
  10. AssetFileDescriptor descriptor = assetManager.openFd(fileNames[i]);
  11. ids[i] = (short) soundPool.load(descriptor, 1);
  12. }
  13. } catch(IOException e) {
  14. //
  15. }
  16. return ids;
  17. }
  18. public void playSound(short id, float rV, float lV) {
  19. if(id != -1) {
  20. soundPool.play(id, rV, lV, 0, 0, 1);
  21. }
  22. }
  23. public void pauseSound() {
  24. soundPool.autoPause();
  25. }	
  26. public void releaseSound() {
  27. soundPool.release();
  28. }
  29. }

huangapple
  • 本文由 发表于 2020年9月14日 02:39:30
  • 转载请务必保留本文链接：https://go.coder-hub.com/63874298.html
  • android
  • java
  • motionevent
  • multi-touch
  • soundpool
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