java - Android 资源管理器无法从资源目录加载 wav 文件资源

Question

我有一些 wav 文件，我想在 Android 资源管理器的帮助下加载它们。不幸的是，每次我尝试这样做时，都会收到以下错误

java.io.FileNotFoundException: audio-file.wav not found

我想将以下资源添加到 Android 声音池中。

这是我的应用程序设置的图像。

Application IDE Set up

我的代码

public class MyActivity extends AppCompatActivity {

  protected abstract Fragment createFragment();

  @LayoutRes
  protected int getLayoutRes() {
    return R.layout.activity_fragment;
  }

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(getLayoutRes());

    FragmentManager fm = getSupportFragmentManager();
    Fragment fragment = fm.findFragmentById(R.id.fragment_container);
    if (fragment == null) {
      fragment = new MyActivityFragment();
      fm.beginTransaction().add(R.id.fragment_container, fragment).commit();
    }
  }

}

fragment

    public class MyActivityFragment extends Fragment {

       private static final String TAG = "MyFragment";
       private static final String SOUNDS_FOLDER = "sample_sounds";
       private static final int MAX_SOUNDS = 5;


    private final AssetManager mAssetManager;

      private final List<Integer> sounds = new ArrayList<>();
      private SoundPool mSoundPool; 

      @Override
      public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRetainInstance(true);
        this.mAssetManager = getActivity().getAssets();
        this.loadAssets();
        mSoundPool = this.buildSoundPool();
      }

      @Override
      public void onDestroy() {
        super.onDestroy();
        mSoundPool.release();
      }


  private SoundPool buildSoundPool() {
    SoundPool.Builder builder = new SoundPool.Builder();
    builder.setMaxStreams(MAX_SOUNDS);
    builder.setAudioAttributes(new AudioAttributes.Builder()
        .setUsage(AudioAttributes.USAGE_MEDIA)
        .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
        .build());
    return builder.build();
  }

  private void loadAssets() {
    try {
      String[] soundNames = mAssetManager.list(SOUNDS_FOLDER);
      for (String soundName : soundNames) {
        sounds.add(load(soundName));
      }
    } catch (IOException ioe) {
      Log.e(TAG, "Could not list assets");
    }
  }

   private int load(String soundName) throws IOException {
      AssetFileDescriptor afd = mAssetManager.openFd(soundName);
      int soundId = mSoundPool.load(afd, 1);
      return soundId;
   }
}

此方法引发 FileNotFoundException。

private int load(String soundName) throws IOException {
    AssetFileDescriptor afd = mAssetManager.openFd(soundName);
    int soundId = mSoundPool.load(afd, 1);
    return soundId;
  }

正是这一行

AssetFileDescriptor afd = mAssetManager.openFd(soundName);

我已经浏览了与此问题相关的其他帖子，但最新的帖子至少有 3 年历史了。我不知道我做错了什么。任何帮助将不胜感激。

Answer 1

IIRC, list() 返回 Assets 目录中项目的名称。它不会返回这些项目的路径。

尝试替换:

AssetFileDescriptor afd = mAssetManager.openFd(soundName);

与:

AssetFileDescriptor afd = mAssetManager.openFd(SOUND_FOLDER+"/"+soundName);