关于安卓visualizer的用法

看别人显示播放wav文件显示频谱写的代码都是断断续续的，在这里我贴了完整的代码，给有需要的人做参考，显示频谱还没有完成，不知道怎么弄，已经可以得到byte[] fft数据了，参考别人的写法也可以开方取模了，但是就是耗在了byte[]转doule[]上了，因为我用achartEngine画图的，所以现在还没有解决办法，有谁知道的，请在给我留言，谢谢。下面上代码，布局文件就不贴了，很简单的就是两个按钮

package com.example.visualizer;import android.app.Activity;import android.media.MediaPlayer;import android.media.audiofx.Visualizer;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;public class MainActivity extends Activity {private MediaPlayer mediaPlayer;private Visualizer visualizer;Button playButton, stopButton;Uri pathUri;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);playButton = (Button) findViewById(R.id.button1);stopButton = (Button) findViewById(R.id.button2);playButton.setOnClickListener(listener);stopButton.setOnClickListener(listener);pathUri = Uri.parse(Environment.getExternalStorageDirectory().getPath()+ "/heartBit.wav");System.out.println(pathUri);mediaPlayer = MediaPlayer.create(this, pathUri);visualizer = new Visualizer(mediaPlayer.getAudioSessionId());visualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);System.out.println(Visualizer.getCaptureSizeRange()[1]);visualizer.setDataCaptureListener(new Visualizer.OnDataCaptureListener() {@Overridepublic void onWaveFormDataCapture(Visualizer arg0,byte[] arg1, int arg2) {// TODO Auto-generated method stub}@Overridepublic void onFftDataCapture(Visualizer arg0, byte[] fft,int arg2) {//返回的经过FFT处理后的数据// TODO Auto-generated method stubtry {System.out.println(DataFix.getHexString(fft));} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}, Visualizer.getMaxCaptureRate() / 2, false, true);visualizer.setEnabled(true);//这步不能忘记mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {//监听器@Overridepublic void onCompletion(MediaPlayer arg0) {// TODO Auto-generated method stubvisualizer.setEnabled(false);}});}View.OnClickListener listener = new View.OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubswitch (arg0.getId()) {case R.id.button1:mediaPlayer.start();break;case R.id.button2:mediaPlayer.pause();break;default:break;}}};@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}}

开方取模的处理方法，参考别人的代码：

byte[] model = new byte[fft.length / 2 + 1];model[0] = (byte) Math.abs(fft[0]);for (int i = 2, j = 1; j < mSpectrumNum;) {model[j] = (byte) Math.hypot(fft[i], fft[i + 1]);i += 2;j++;}

到这里返回的还是byte[]数组，话说java下的转型相当麻烦，还不知道怎么解决！