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;

	@Override

	protected 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() {

					@Override

					public void onWaveFormDataCapture(Visualizer arg0,

							byte[] arg1, int arg2) {

						// TODO Auto-generated method stub

					}

					@Override

					public void onFftDataCapture(Visualizer arg0, byte[] fft,

							int arg2) {//返回的经过FFT处理后的数据

						// TODO Auto-generated method stub

						try {

							System.out.println(DataFix.getHexString(fft));

						} catch (Exception e) {

							// TODO Auto-generated catch block

							e.printStackTrace();

						}

					}

				}, Visualizer.getMaxCaptureRate() / 2, false, true);

		visualizer.setEnabled(true);//这步不能忘记

		mediaPlayer

				.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {//监听器

					@Override

					public void onCompletion(MediaPlayer arg0) {

						// TODO Auto-generated method stub

						visualizer.setEnabled(false);

					}

				});

	}

	View.OnClickListener listener = new View.OnClickListener() {

		@Override

		public void onClick(View arg0) {

			// TODO Auto-generated method stub

			switch (arg0.getId()) {

			case R.id.button1:

				mediaPlayer.start();

				break;

			case R.id.button2:

				mediaPlayer.pause();

				break;

			default:

				break;

			}

		}

	};

	@Override

	public 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;

	}

	@Override

	public 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！

巴特西

关于安卓visualizer的用法

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