android的频谱代码
[代码] 代码public class AudioFxActivity extends Activity
{
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;
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);
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();
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.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();
final short maxEqualizer = mEqualizer.getBandLevelRange();
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);
mVisualizer = new Visualizer(mMediaPlayer.getAudioSessionId());
// 参数内必须是2的位数
mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange());
// 设置允许波形表示，并且捕获它
mVisualizer.setDataCaptureListener(new OnDataCaptureListener()
{
@Override
public void onWaveFormDataCapture(Visualizer visualizer,
byte[] waveform, int samplingRate)
{
// TODO Auto-generated method stub
mVisualizerView.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;
}
mRect.set(0, 0, getWidth(), getHeight());
for (int i = 0; i < mBytes.length - 1; i++)
{
mPoints = mRect.width() * i / (mBytes.length - 1);
mPoints = mRect.height() / 2
+ ((byte) (mBytes + 128)) * (mRect.height() / 2)
/ 128;
mPoints = mRect.width() * (i + 1)
/ (mBytes.length - 1);
mPoints = mRect.height() / 2
+ ((byte) (mBytes + 128)) * (mRect.height() / 2)
/ 128;
}
canvas.drawLines(mPoints, mPaint);
}
}
}
成功的路上，吉利的路上，人总是越聚越多，失帐的路上，祸患的上到底也有人走，虽然不是愿意的，这不愿意只是在事后才后悔不及，永以为戒。 这里也鼓励鼓励。回复鼓励一下，期待楼主更好作品 一点也看不懂 不知道哪来干什么用的 一点也看不懂 不知道哪来干什么用的 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));
这部分没看懂啊
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