Question

Note: I’m kind of a noob so dont really know what these errors mean.

This is my class code:

package ryan.test;

import java.util.HashMap;

import android.content.Context;
import android.media.AudioManager;
import android.media.SoundPool;

public class MySingleton {

    private MySingleton instance;

    private static SoundPool mSoundPool;
    private HashMap<Integer, Integer> soundPoolMap;

    public static final int A1 = 1;

    private MySingleton() {
        mSoundPool = new SoundPool(5, AudioManager.STREAM_MUSIC, 0);// Just an example
        soundPoolMap = new HashMap<Integer, Integer>();
        soundPoolMap.put(A1, mSoundPool.load(this, R.raw.a,    1));
   //   soundPoolMap.put(A5, mSoundPool.load(MyApp.this,       R.raw.a,    1));
    }

    public synchronized MySingleton getInstance() {
        if(instance == null) {
            instance = new MySingleton();
        }
        return instance;
    }

    public void playSound(int sound) {
        AudioManager mgr = (AudioManager)MySingleton.getSystemService(Context.AUDIO_SERVICE);
        float streamVolumeCurrent = mgr.getStreamVolume(AudioManager.STREAM_MUSIC);
        float streamVolumeMax = mgr.getStreamMaxVolume(AudioManager.STREAM_MUSIC);    
        float volume = streamVolumeCurrent / streamVolumeMax;

        mSoundPool.play(soundPoolMap.get(sound), volume, volume, 1, 0, 1f);     
    }

    public SoundPool getSoundPool() {
        return mSoundPool;
   }
}

And I am getting two errors, the first error is here:

soundPoolMap.put(A1, mSoundPool.load(this, R.raw.a,    1));

and the error says The method load(Context, int, int) in the type SoundPool is not applicable for the arguments (MySingleton, int, int)
and the second error is here:

AudioManager mgr = (AudioManager)MySingleton.getSystemService(Context.AUDIO_SERVICE);

and the error says The method getSystemService(String) is undefined for the type MySingleton

Answer 1

You need a Context to use those methods. getSystemService is a method of the Context instance, myActivity.getSystemService(). load() also expects you to pass in the Context instance (myActivity) as the first argument. It’s not recommended that you keep a reference to the context outside of the main activity, so you should consider moving this logic back into the activity. Why are you trying to do this in a singleton? Play music in the background? Use a service.