Android AoundTrack

Android AoundTrack

package com.example.kankanla.start;

import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toast.makeText(this, "AudioTrack.demo", Toast.LENGTH_LONG).show();
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    AP();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }

    protected void AP() throws IOException {
        int sampleRateInHz = 44100;
        int buferSize = AudioTrack.getMinBufferSize(
                sampleRateInHz,
                AudioFormat.CHANNEL_IN_STEREO,
                AudioFormat.ENCODING_PCM_16BIT);
        AudioTrack audioTrack = new AudioTrack(
                AudioManager.STREAM_MUSIC,
                sampleRateInHz,
                AudioFormat.CHANNEL_IN_STEREO,
                AudioFormat.ENCODING_PCM_16BIT,
                buferSize, AudioTrack.MODE_STREAM);

        FileInputStream fileInputStream = new FileInputStream(new File(Environment.getExternalStorageDirectory().toString(), "PCM-D50_441kHz16bit.wav"));
        byte[] buffer = new byte[buferSize];
        int lens = 0;
        audioTrack.play();
        while ((lens = fileInputStream.read(buffer)) != -1) {
            audioTrack.write(buffer, 0, lens);
        }
        System.out.println(audioTrack.getPlayState());
        audioTrack.stop();
        System.out.println(audioTrack.getPlayState());
        System.out.println(Thread.currentThread().getName());

//        public static final int PLAYSTATE_STOPPED = 1;  // matches SL_PLAYSTATE_STOPPED
//        /** indicates AudioTrack state is paused */
//        public static final int PLAYSTATE_PAUSED  = 2;  // matches SL_PLAYSTATE_PAUSED
//        /** indicates AudioTrack state is playing */
//        public static final int PLAYSTATE_PLAYING = 3;  // matches SL_PLAYSTATE_PLAYING
    }
}