android > Android(安卓)音频均衡器，可通过拖动调节音频EQ

Android 音频均衡器，可通过拖动调节音频EQ" src="https://img.it610.com/image/product/772e19e851dd4a32900b9488dbb475f4.png" width="351" height="382">
AudioFxActionty.java
package com.terry.AudioFx;import android.annotation.SuppressLint;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.media.audiofx.Visualizer.OnDataCaptureListener;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;@SuppressLint("NewApi")public class AudioFxActivity extends Activity {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;private TextView mStatusTextView;/** Called when the activity is first created. */@SuppressLint("NewApi")@Overridepublic 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.eason);setupVisualizerFxAndUi();setupEqualizeFxAndUi();mVisualizer.setEnabled(true);mMediaPlayer.setOnCompletionListener(new OnCompletionListener() {@Overridepublic void onCompletion(MediaPlayer mp) {// TODO Auto-generated method stubmVisualizer.setEnabled(false);}});mMediaPlayer.start();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 */@SuppressLint("NewApi")private void setupEqualizeFxAndUi() {mEqualizer = new Equalizer(0, mMediaPlayer.getAudioSessionId());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() {@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// TODO Auto-generated method stubmEqualizer.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 */@SuppressLint("NewApi")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);mVisualizer = new Visualizer(mMediaPlayer.getAudioSessionId());// 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mVisualizer.setDataCaptureListener(new OnDataCaptureListener() {@Overridepublic void onWaveFormDataCapture(Visualizer visualizer,byte[] waveform, int samplingRate) {// TODO Auto-generated method stubmVisualizerView.updateVisualizer(waveform);}@Overridepublic void onFftDataCapture(Visualizer visualizer, byte[] fft,int samplingRate) {// TODO Auto-generated method stub}}, Visualizer.getMaxCaptureRate() / 2, true, false);}@Overrideprotected void onPause() {// TODO Auto-generated method stubsuper.onPause();if (isFinishing() && mMediaPlayer != null) {mVisualizer.release();mMediaPlayer.release();mEqualizer.release();mMediaPlayer = null;}}class VisualizerView extends View {@SuppressLint("NewApi")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();}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.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);}}}
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