android 音乐律动频谱实现

package com.terry.AudioFx; import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Rect; import android.media.AudioManager; import android.media.MediaPlayer; import android.media.MediaPlayer.OnCompletionListener; import android.media.audiofx.Equalizer; import android.media.audiofx.Visualizer; import android.os.Bundle; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.widget.LinearLayout; import android.widget.SeekBar; import android.widget.TextView; import android.widget.SeekBar.OnSeekBarChangeListener; public class AudioFxActivity extends Activity { @SuppressWarnings("unused") private static final String TAG = "AudioFxActivity"; private static final float VISUALIZER_HEIGHT_DIP = 50f; private MediaPlayer mMediaPlayer; private Visualizer mVisualizer; private Equalizer mEqualizer; // 均衡器 private LinearLayout mLayout; VisualizerView mVisualizerView; BaseVisualizerView mBaseVisualizerView; private TextView mStatusTextView; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setVolumeControlStream(AudioManager.STREAM_MUSIC); mStatusTextView = new TextView(this); mLayout = new LinearLayout(this); mLayout.setOrientation(LinearLayout.VERTICAL); mLayout.addView(mStatusTextView); setContentView(mLayout); mMediaPlayer = MediaPlayer.create(this, R.raw.z8806c); // mMediaPlayer = new MediaPlayer(); setupVisualizerFxAndUi(); setupEqualizeFxAndUi(); mVisualizer.setEnabled(true); mMediaPlayer.setOnCompletionListener(new OnCompletionListener() { @Override public void onCompletion(MediaPlayer mp) { // TODO Auto-generated method stub // mVisualizer.setEnabled(false); } }); mMediaPlayer.start(); mMediaPlayer.setLooping(true); mStatusTextView.setText("播放中。。。"); } /** * 通过mMediaPlayer返回的AudioSessionId创建一个优先级为0均衡器对象 并且通过频谱生成相应的UI和对应的事件 */ private void setupEqualizeFxAndUi() { mEqualizer = new Equalizer(0, mMediaPlayer.getAudioSessionId()); // mEqualizer = new Equalizer(0, 0); mEqualizer.setEnabled(true);// 启用均衡器 TextView eqTextView = new TextView(this); eqTextView.setText("均衡器："); mLayout.addView(eqTextView); // 通过均衡器得到其支持的频谱引擎 short bands = mEqualizer.getNumberOfBands(); // getBandLevelRange 是一个数组，返回一组频谱等级数组， // 第一个下标为最低的限度范围 // 第二个下标为最大的上限,依次取出 final short minEqualizer = mEqualizer.getBandLevelRange()[0]; final short maxEqualizer = mEqualizer.getBandLevelRange()[1]; for (short i = 0; i < bands; i++) { final short band = i; TextView freqTextView = new TextView(this); freqTextView.setLayoutParams(new ViewGroup.LayoutParams( ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)); freqTextView.setGravity(Gravity.CENTER_HORIZONTAL); // 取出中心频率 freqTextView .setText((mEqualizer.getCenterFreq(band) / 1000) + "HZ"); mLayout.addView(freqTextView); LinearLayout row = new LinearLayout(this); row.setOrientation(LinearLayout.HORIZONTAL); TextView minDbTextView = new TextView(this); minDbTextView.setLayoutParams(new ViewGroup.LayoutParams( ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)); minDbTextView.setText((minEqualizer / 100) + " dB"); TextView maxDbTextView = new TextView(this); maxDbTextView.setLayoutParams(new ViewGroup.LayoutParams( ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)); maxDbTextView.setText((maxEqualizer / 100) + " dB"); LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams( ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); layoutParams.weight = 1; SeekBar seekbar = new SeekBar(this); seekbar.setLayoutParams(layoutParams); seekbar.setMax(maxEqualizer - minEqualizer); seekbar.setProgress(mEqualizer.getBandLevel(band)); seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { @Override public void onStopTrackingTouch(SeekBar seekBar) { } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { // TODO Auto-generated method stub mEqualizer.setBandLevel(band, (short) (progress + minEqualizer)); } }); row.addView(minDbTextView); row.addView(seekbar); row.addView(maxDbTextView); mLayout.addView(row); } } /** * 生成一个VisualizerView对象，使音频频谱的波段能够反映到 VisualizerView上 */ private void setupVisualizerFxAndUi() { // mVisualizerView = new VisualizerView(this); // // mVisualizerView.setLayoutParams(new ViewGroup.LayoutParams( // ViewGroup.LayoutParams.FILL_PARENT, // (int) (VISUALIZER_HEIGHT_DIP * getResources() // .getDisplayMetrics().density))); // mLayout.addView(mVisualizerView); mBaseVisualizerView = new BaseVisualizerView(this); mBaseVisualizerView.setLayoutParams(new ViewGroup.LayoutParams( ViewGroup.LayoutParams.FILL_PARENT, (int) (VISUALIZER_HEIGHT_DIP * getResources() .getDisplayMetrics().density))); mLayout.addView(mBaseVisualizerView); mVisualizer = new Visualizer(mMediaPlayer.getAudioSessionId()); // mVisualizer = new Visualizer(0); // 参数内必须是2的位数 mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]); // 设置允许波形表示，并且捕获它 mBaseVisualizerView.setVisualizer(mVisualizer); /*mVisualizer.setDataCaptureListener(new OnDataCaptureListener() { @Override public void onWaveFormDataCapture(Visualizer visualizer, byte[] waveform, int samplingRate) { // TODO Auto-generated method stub // mVisualizerView.updateVisualizer(waveform); // mBaseVisualizerView.updateVisualizer(waveform); } @Override public void onFftDataCapture(Visualizer visualizer, byte[] fft, int samplingRate) { // TODO Auto-generated method stub } }, Visualizer.getMaxCaptureRate() / 2, true, false); */ } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); if (isFinishing() && mMediaPlayer != null) { mVisualizer.release(); mMediaPlayer.release(); mEqualizer.release(); mMediaPlayer = null; } } class VisualizerView extends View { private byte[] mBytes; private float[] mPoints; // 矩形区域 private Rect mRect = new Rect(); // 画笔 private Paint mPaint = new Paint(); // 初始化画笔 private void init() { mBytes = null; mPaint.setStrokeWidth(1f); mPaint.setAntiAlias(true); mPaint.setColor(Color.BLUE); } public VisualizerView(Context context) { super(context); init(); } public void updateVisualizer(byte[] mbyte) { mBytes = mbyte; invalidate(); } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); if (mBytes == null) { return; } if (mPoints == null || mPoints.length < mBytes.length * 4) { mPoints = new float[mBytes.length * 4]; } mRect.set(0, 0, getWidth(), getHeight()); for (int i = 0; i < mBytes.length - 1; i++) { mPoints[i * 4] = mRect.width() * i / (mBytes.length - 1); mPoints[i * 4 + 1] = mRect.height() / 2 + ((byte) (mBytes[i] + 128)) * (mRect.height() / 2) / 128; mPoints[i * 4 + 2] = mRect.width() * (i + 1) / (mBytes.length - 1); mPoints[i * 4 + 3] = mRect.height() / 2 + ((byte) (mBytes[i + 1] + 128)) * (mRect.height() / 2) / 128; } canvas.drawLines(mPoints, mPaint); } } }