android使用SoundPool播放音效的方法

Sure! Here is a detailed guide on how to use SoundPool to play sound effects in Android:

1. Import the necessary classes:

import android.media.AudioAttributes;
import android.media.AudioManager;
import android.media.SoundPool;

1. Create an instance of SoundPool and define the maximum number of simultaneous streams:

SoundPool soundPool;
int maxStreams = 5; // Maximum number of simultaneous streams
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
    AudioAttributes audioAttributes = new AudioAttributes.Builder()
            .setUsage(AudioAttributes.USAGE_GAME)
            .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
            .build();
    soundPool = new SoundPool.Builder()
            .setMaxStreams(maxStreams)
            .setAudioAttributes(audioAttributes)
            .build();
} else {
    soundPool = new SoundPool(maxStreams, AudioManager.STREAM_MUSIC, 0);
}

1. Load the sound effects into SoundPool:

int soundId1 = soundPool.load(context, R.raw.sound1, 1);
int soundId2 = soundPool.load(context, R.raw.sound2, 1);

In this example, sound1 and sound2 are the sound effect files located in the res/raw directory.

1. Play the sound effect:

soundPool.play(soundId1, 1.0f, 1.0f, 1, 0, 1.0f);

The parameters for the play() method are as follows:
- soundID: The sound effect ID returned by the load() method.
- leftVolume and rightVolume: The left and right volume levels (range from 0.0 to 1.0).
- priority: The priority of the sound effect (0 is the lowest priority).
- loop: The number of times the sound effect should loop (0 means no loop, -1 means loop indefinitely).
- rate: The playback rate (range from 0.5 to 2.0, where 1.0 is normal playback rate).

Here's another example to play a sound effect with looping:

soundPool.play(soundId2, 0.5f, 0.5f, 1, -1, 1.0f);

In this example, soundId2 is the ID of the sound effect, and it will play with a volume of 0.5, loop indefinitely, and at the normal playback rate.

Remember to release the SoundPool resources when you're done:

soundPool.release();

That's it! You now have a complete guide on how to use SoundPool to play sound effects in Android.