Tempo Sensor

-I am trying to build a tempo sensor app that measures the beats per minute when someone is playing music. The following code I have displayed myself using Android programming. All I need is a modification, or what changes within the following program should I use??

package com.example.egrstudent.test2; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.content.pm.ActivityInfo; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.media.AudioFormat; import android.media.AudioRecord; import android.media.MediaRecorder; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; import android.view.Display; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup.LayoutParams; import android.view.ViewGroup.MarginLayoutParams; import android.view.Window; import android.view.WindowManager; import android.widget.Button; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.Toast; import com.example.egrstudent.test2.RealDoubleFFT; public class MainActivity extends Activity implements OnClickListener{ int frequency = 8000; int channelConfiguration = AudioFormat.CHANNEL_CONFIGURATION_MONO; int audioEncoding = AudioFormat.ENCODING_PCM_16BIT; AudioRecord audioRecord; private RealDoubleFFT transformer; int blockSize;// = 256;  Button startStopButton; boolean started = false; boolean CANCELLED_FLAG = false; // double max_magnitude = 0.0; // int max_index = 0;  double[] toTransform; RecordAudio recordTask; ImageView imageViewDisplaySectrum; MyImageView imageViewScale; Bitmap bitmapDisplaySpectrum; Canvas canvasDisplaySpectrum; Paint paintSpectrumDisplay; Paint paintScaleDisplay; static MainActivity mainActivity; LinearLayout main; int width; int height; int left_Of_BimapScale; int left_Of_DisplaySpectrum; private final static int ID_BITMAPDISPLAYSPECTRUM = 1; private final static int ID_IMAGEVIEWSCALE = 2; /** Called when the activity is first created. */  @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Display display = getWindowManager().getDefaultDisplay(); //Point size = new Point();  //display.get(size);  width = display.getWidth(); height = display.getHeight(); blockSize = 256; } @Override public void onWindowFocusChanged (boolean hasFocus) { //left_Of_BimapScale = main.getC.getLeft();  MyImageView scale = (MyImageView)main.findViewById(ID_IMAGEVIEWSCALE); ImageView bitmap = (ImageView)main.findViewById(ID_BITMAPDISPLAYSPECTRUM); left_Of_BimapScale = scale.getLeft(); left_Of_DisplaySpectrum = bitmap.getLeft(); } private class RecordAudio extends AsyncTaskdouble[], Boolean> { @Override protected Boolean doInBackground(Void... params) { int bufferSize = AudioRecord.getMinBufferSize(frequency, channelConfiguration, audioEncoding); audioRecord = new AudioRecord( MediaRecorder.AudioSource.DEFAULT, frequency, channelConfiguration, audioEncoding, bufferSize); int bufferReadResult; short[] buffer = new short[blockSize]; toTransform = new double[blockSize]; try { audioRecord.startRecording(); } catch (IllegalStateException e) { Log.e("Recording failed", e.toString()); } while (started) { if (isCancelled() || (CANCELLED_FLAG == true)) { started = false; //publishProgress(cancelledResult);  Log.d("doInBackground", "Cancelling the RecordTask"); break; } else { bufferReadResult = audioRecord.read(buffer, 0, blockSize); for (int i = 0; i < blockSize && i < bufferReadResult; i++) { toTransform[i] = (double) buffer[i] / 32768.0; // signed 16 bit  } transformer.ft(toTransform); publishProgress(toTransform); } } return true; } @Override protected void onProgressUpdate(double[]...progress) { Log.e("RecordingProgress", "Displaying in progress"); Log.d("Test:", Integer.toString(progress[0].length)); if (width > 512) { for (int i = 0; i < progress[0].length; i++) { int x = 2 * i; int downy = (int) (150 - (progress[0][i] * 10)); int upy = 150; canvasDisplaySpectrum.drawLine(x, downy, x, upy, paintSpectrumDisplay); } imageViewDisplaySectrum.invalidate(); } else { for (int i = 0; i < progress[0].length; i++) { int x = i; int downy = (int) (150 - (progress[0][i] * 10)); int upy = 150; canvasDisplaySpectrum.drawLine(x, downy, x, upy, paintSpectrumDisplay); } imageViewDisplaySectrum.invalidate(); } } @Override protected void onPostExecute(Boolean result) { super.onPostExecute(result); try{ audioRecord.stop(); } catch(IllegalStateException e){ Log.e("Stop failed", e.toString()); } canvasDisplaySpectrum.drawColor(Color.BLACK); imageViewDisplaySectrum.invalidate(); } } protected void onCancelled(Boolean result){ try{ audioRecord.stop(); } catch(IllegalStateException e){ Log.e("Stop failed", e.toString()); } /* //recordTask.cancel(true);  Log.d("FFTSpectrumAnalyzer","onCancelled: New Screen");  Intent intent = new Intent(Intent.ACTION_MAIN);  intent.addCategory(Intent.CATEGORY_HOME);  intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  startActivity(intent); */  } public void onClick(View v) { if (started == true) { //started = false;  CANCELLED_FLAG = true; //recordTask.cancel(true);  try{ audioRecord.stop(); } catch(IllegalStateException e){ Log.e("Stop failed", e.toString()); } startStopButton.setText("Start"); canvasDisplaySpectrum.drawColor(Color.BLACK); } else { started = true; CANCELLED_FLAG = false; startStopButton.setText("Stop"); recordTask = new RecordAudio(); recordTask.execute(); } } static MainActivity getMainActivity(){ return mainActivity; } public void onStop(){ super.onStop(); /* try{  audioRecord.stop();  }  catch(IllegalStateException e){  Log.e("Stop failed", e.toString());  }*/  recordTask.cancel(true); Intent intent = new Intent(Intent.ACTION_MAIN); intent.addCategory(Intent.CATEGORY_HOME); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(intent); } public void onStart() { super.onStart(); main = new LinearLayout(this); main.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, android.view.ViewGroup.LayoutParams.MATCH_PARENT)); main.setOrientation(LinearLayout.VERTICAL); setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); transformer = new RealDoubleFFT(blockSize); imageViewDisplaySectrum = new ImageView(this); if(width > 512){ bitmapDisplaySpectrum = Bitmap.createBitmap((int)512,(int)300,Bitmap.Config.ARGB_8888); } else{ bitmapDisplaySpectrum = Bitmap.createBitmap((int)256,(int)150,Bitmap.Config.ARGB_8888); } LinearLayout.LayoutParams layoutParams_imageViewScale = null; //Bitmap scaled = Bitmap.createScaledBitmap(bitmapDisplaySpectrum, 320, 480, true);  canvasDisplaySpectrum = new Canvas(bitmapDisplaySpectrum); //canvasDisplaySpectrum = new Canvas(scaled);  paintSpectrumDisplay = new Paint(); paintSpectrumDisplay.setColor(Color.GREEN); imageViewDisplaySectrum.setImageBitmap(bitmapDisplaySpectrum); if(width >512){ //imageViewDisplaySectrum.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT));  LinearLayout.LayoutParams layoutParams_imageViewDisplaySpectrum=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); ((MarginLayoutParams) layoutParams_imageViewDisplaySpectrum).setMargins(100, 600, 0, 0); imageViewDisplaySectrum.setLayoutParams(layoutParams_imageViewDisplaySpectrum); layoutParams_imageViewScale= new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); //layoutParams_imageViewScale.gravity = Gravity.CENTER_HORIZONTAL;  ((MarginLayoutParams) layoutParams_imageViewScale).setMargins(100, 20, 0, 0); } else if ((width >320) && (width<512)){ LinearLayout.LayoutParams layoutParams_imageViewDisplaySpectrum=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); ((MarginLayoutParams) layoutParams_imageViewDisplaySpectrum).setMargins(60, 250, 0, 0); //layoutParams_imageViewDisplaySpectrum.gravity = Gravity.CENTER_HORIZONTAL;  imageViewDisplaySectrum.setLayoutParams(layoutParams_imageViewDisplaySpectrum); //imageViewDisplaySectrum.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT));  layoutParams_imageViewScale=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); ((MarginLayoutParams) layoutParams_imageViewScale).setMargins(60, 20, 0, 100); //layoutParams_imageViewScale.gravity = Gravity.CENTER_HORIZONTAL;  } else if (width < 320){ /*LinearLayout.LayoutParams layoutParams_imageViewDisplaySpectrum=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);  ((MarginLayoutParams) layoutParams_imageViewDisplaySpectrum).setMargins(30, 100, 0, 100);  imageViewDisplaySectrum.setLayoutParams(layoutParams_imageViewDisplaySpectrum);*/  imageViewDisplaySectrum.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT)); layoutParams_imageViewScale=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); //layoutParams_imageViewScale.gravity = Gravity.CENTER;  } imageViewDisplaySectrum.setId(ID_BITMAPDISPLAYSPECTRUM); main.addView(imageViewDisplaySectrum); imageViewScale = new MyImageView(this); imageViewScale.setLayoutParams(layoutParams_imageViewScale); imageViewScale.setId(ID_IMAGEVIEWSCALE); imageViewScale.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT)); main.addView(imageViewScale); startStopButton = new Button(this); startStopButton.setText("Start"); startStopButton.setOnClickListener(this); startStopButton.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT)); main.addView(startStopButton); setContentView(main); mainActivity = this; } @Override public void onBackPressed() { super.onBackPressed(); try{ audioRecord.stop(); } catch(IllegalStateException e){ Log.e("Stop failed", e.toString()); } recordTask.cancel(true); Intent intent = new Intent(Intent.ACTION_MAIN); intent.addCategory(Intent.CATEGORY_HOME); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(intent); } @Override protected void onDestroy() { // TODO Auto-generated method stub  super.onDestroy(); try{ audioRecord.stop(); } catch(IllegalStateException e){ Log.e("Stop failed", e.toString()); } recordTask.cancel(true); Intent intent = new Intent(Intent.ACTION_MAIN); intent.addCategory(Intent.CATEGORY_HOME); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(intent); } //Custom Imageview Class  public class MyImageView extends ImageView { Paint paintScaleDisplay; Bitmap bitmapScale; Canvas canvasScale; public MyImageView(Context context) { super(context); // TODO Auto-generated constructor stub  if(width >512){ bitmapScale = Bitmap.createBitmap((int)512,(int)50,Bitmap.Config.ARGB_8888); } else{ bitmapScale = Bitmap.createBitmap((int)256,(int)50,Bitmap.Config.ARGB_8888); } paintScaleDisplay = new Paint(); paintScaleDisplay.setColor(Color.WHITE); paintScaleDisplay.setStyle(Paint.Style.FILL); canvasScale = new Canvas(bitmapScale); setImageBitmap(bitmapScale); invalidate(); } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub  super.onDraw(canvas); if(width > 512){ canvasScale.drawLine(0, 30, 512, 30, paintScaleDisplay); for(int i = 0,j = 0; i< 512; i=i+128, j++){ for (int k = i; k<(i+128); k=k+16){ canvasScale.drawLine(k, 30, k, 25, paintScaleDisplay); } canvasScale.drawLine(i, 40, i, 25, paintScaleDisplay); String text = Integer.toString(j) + " KHz"; canvasScale.drawText(text, i, 45, paintScaleDisplay); } canvas.drawBitmap(bitmapScale, 0, 0, paintScaleDisplay); } else if ((width >320) && (width<512)){ canvasScale.drawLine(0, 30, 0 + 256, 30, paintScaleDisplay); for(int i = 0,j = 0; i<256; i=i+64, j++){ for (int k = i; k<(i+64); k=k+8){ canvasScale.drawLine(k, 30, k, 25, paintScaleDisplay); } canvasScale.drawLine(i, 40, i, 25, paintScaleDisplay); String text = Integer.toString(j) + " KHz"; canvasScale.drawText(text, i, 45, paintScaleDisplay); } canvas.drawBitmap(bitmapScale, 0, 0, paintScaleDisplay); } else if (width <320){ canvasScale.drawLine(0, 30, 256, 30, paintScaleDisplay); for(int i = 0,j = 0; i<256; i=i+64, j++){ for (int k = i; k<(i+64); k=k+8){ canvasScale.drawLine(k, 30, k, 25, paintScaleDisplay); } canvasScale.drawLine(i, 40, i, 25, paintScaleDisplay); String text = Integer.toString(j) + " KHz"; canvasScale.drawText(text, i, 45, paintScaleDisplay); } canvas.drawBitmap(bitmapScale, 0, 0, paintScaleDisplay); } } } }