等待的Soundpool到移动与应用程序之前加载 [英] Waiting for SoundPool to load before moving on with application

问题描述

我在下面的教程来的Soundpool融入我的应用程序，这是code这是在本教程给出：

I was following a tutorial to integrate SoundPool into my app, and this is the code which was given in the tutorial:

package com.example.soundpoolexample;

import android.app.Activity;
import android.media.AudioManager;
import android.media.SoundPool;
import android.media.SoundPool.OnLoadCompleteListener;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

public class SoundPoolExample extends Activity implements OnTouchListener {
    private SoundPool soundPool;
    private int soundID;
    boolean loaded = false;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        View view = findViewById(R.id.textView1);
        view.setOnTouchListener(this);
        // Set the hardware buttons to control the music
        this.setVolumeControlStream(AudioManager.STREAM_MUSIC);
        // Load the sound
        soundPool = new SoundPool(10, AudioManager.STREAM_MUSIC, 0);
        soundPool.setOnLoadCompleteListener(new OnLoadCompleteListener() {
            @Override
            public void onLoadComplete(SoundPool soundPool, int sampleId,
                    int status) {
                loaded = true;
            }
        });
        soundID = soundPool.load(this, R.raw.sound1, 1);

    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            // Getting the user sound settings
            AudioManager audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
            float actualVolume = (float) audioManager
                    .getStreamVolume(AudioManager.STREAM_MUSIC);
            float maxVolume = (float) audioManager
                    .getStreamMaxVolume(AudioManager.STREAM_MUSIC);
            float volume = actualVolume / maxVolume;
            // Is the sound loaded already?
            if (loaded) {
                soundPool.play(soundID, volume, volume, 1, 0, 1f);
                Log.e("Test", "Played sound");
            }
        }
        return false;
    }
}

现在的问题是，我要确保应用程序只向前移动一次的Soundpool加载成功，并没有检查它是否在每次播放声音之前加载。我将如何做到这一点？

The problem is, I want to make sure that the application only moves forward once the SoundPool is loaded successfully, and not have to check if it is loaded before playing a sound each time. How would I do this?

我相信这是一个穷凶极恶的解决方案，但会像这样的工作后，我加载的onCreate声音文件：？

I am sure this is an atrocious solution, but would something like this work after I load the sound file in onCreate?:

...

    soundID = soundPool.load(this, R.raw.sound1, 1);
    while (!loaded) {}

...

我相信有一个更好的办法。

I am sure there is a better way.

推荐答案

您可以有一个完美的解决方案使用旗语，但尝试的避免的堵的onCreate（），因为应用程序将不会响应，在code在这里只是为了说明使用旗语

You can have an elegant solution using Semaphore, however try to avoid blocking onCreate(), since the app will not be responsive, the code here is just to illustrate the use of Semaphore

public class SoundPoolExample extends Activity implements OnTouchListener {

public static final Semaphore semaphore = new Semaphore(0);

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

    soundPool.setOnLoadCompleteListener(new OnLoadCompleteListener() {
        @Override
        public void onLoadComplete(SoundPool soundPool, int sampleId,
                int status) {

            semaphore.release();
        }
    });
    soundID = soundPool.load(this, R.raw.sound1, 1);

    // Will block since there is not permits (the semaphore is initialized with 0)
    // then will continue once semaphore.release(); is called i.e. after loading is finished
    semaphore.acquire();
} 

// rest of your class

}

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