来自另一个 class 的 getAssets()

Question

代码有没有错误？

它适用于我的主要 activity 和我的片段。但是如果我在声音 class 中使用方法 (loadSound)，getAssets() 不起作用。

请帮帮我，有什么想法吗？谢谢！

这是我的片段代码：

public class CarnivoreFragment extends Fragment {

    private int mCowSound;
    private View view;

    private ImageButton mCowImageButton;


    public CarnivoreFragment() {
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        view = inflater.inflate(R.layout.fragment_carnivore, container, false);

        if (android.os.Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {

            Sound.createOldSoundPool();
        } else {
            Sound.createNewSoundPool();
        }

        mCowSound = Sound.loadSound("cow.wav");

        mCowImageButton = (ImageButton) view.findViewById(R.id.imageButtonCow);
        mCowImageButton.setOnClickListener(onClickListener);

        return view;
    }

    View.OnClickListener onClickListener = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.imageButtonCow:
                    Sound.playSound(mCowSound);
                    Toast.makeText(view.getContext(), "Cow", Toast.LENGTH_SHORT).show();

                    break;

            }
        }
    };
}

和我的 "Sound" class :

public class Sound {

    private  static SoundPool mSoundPool;
    private  static AssetManager mAssetManager;
    private  static int mStreamID;
    private  static Context context;


    public Sound(Context context) {
        this.context = context;
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public static void createNewSoundPool() {
        AudioAttributes attributes = new AudioAttributes.Builder()
                .setUsage(AudioAttributes.USAGE_GAME)
                .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
                .build();
        mSoundPool = new SoundPool.Builder()
                .setAudioAttributes(attributes)
                .build();
    }

    @SuppressWarnings("deprecation")
    public static void createOldSoundPool() {
        mSoundPool = new SoundPool(3, AudioManager.STREAM_MUSIC, 0);
    }

    public static int playSound(int sound) {
        if (sound > 0) {
            mStreamID = mSoundPool.play(sound, 1, 1, 1, 0, 1);
        }
        return mStreamID;
    }

    public static int loadSound(String fileName) {
        mAssetManager = context.getAssets();
        AssetFileDescriptor afd;
        try {
            afd = mAssetManager.openFd(fileName);
        } catch (IOException e) {
            e.printStackTrace();
              Toast.makeText(context, "Не могу загрузить файл " + fileName,
                    Toast.LENGTH_SHORT).show();
            return -1;
        }
        return mSoundPool.load(afd, 1);
    }


}

Answer 1

看起来您可能从未真正在 Sound 中设置上下文 class，因为所有调用似乎都是通过静态方法调用的。您在构造函数中设置了 class 上下文，但似乎从未调用过构造函数。

来自另一个 class 的 getAssets()

getAssets() from another class

android

android-assets