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package com.kekland.fastfouriertest;
 
import android.Manifest;
import android.content.pm.PackageManager;
import android.media.AudioManager;
import android.os.CountDownTimer;
import android.os.Handler;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
 
import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.LineGraphSeries;
 
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
 
public class MainActivity extends AppCompatActivity {
 
    final int PERMISSION_REQUEST_CALLBACK = 25;
 
    Button toggleThreadButton;
    TextView peakText;
    ProgressBar volumeProgress;
    GraphView dataGraph;
 
    AudioRecorderThread thread;
    int indexOfThreadRun = 0;
    int indexToUpdateGraph = 1;
 
    FastFourierTransform fastFourierTransform = new FastFourierTransform(1024, 44100);
 
    public void toggleThread() {
        if(thread == null) {
            if (ContextCompat.checkSelfPermission(this,
                    Manifest.permission.RECORD_AUDIO)
                    != PackageManager.PERMISSION_GRANTED) {
 
                // Permission is not granted
                ActivityCompat.requestPermissions(this,
                        new String[]{Manifest.permission.RECORD_AUDIO},
                        PERMISSION_REQUEST_CALLBACK);
            }
            else {
                thread = new AudioRecorderThread(new AudioRecorderInterface() {
                    @Override
                    public void onDataReceive(final float[] buffer) {
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                //Make sure that everything runs in 30fps
                                indexOfThreadRun++;
                                if (indexOfThreadRun % indexToUpdateGraph == 0) {
                                    //Evaluate Fourier Transform
                                    fastFourierTransform.forward(buffer);
 
                                    //Get the volume
                                    float maxAmplitude = Float.MIN_VALUE;
                                    for (float sample : buffer) {
                                        maxAmplitude = (sample > maxAmplitude) ? sample : maxAmplitude;
                                    }
                                    volumeProgress.setProgress(Math.round(100 * maxAmplitude));
 
                                    float[] transformValues = new float[fastFourierTransform.specSize()];
                                    float transformMax = -1;
                                    float transformAvg = 0f;
                                    for (int i = 0; i < transformValues.length; i++) {
                                        float freq = (i / 1024f) * 44100f;
                                        float invVolume = (1f - (float)Math.sqrt((freq / 20000f)));
                                        transformValues[i] = fastFourierTransform.getBand(i) * invVolume;
                                        transformMax = (transformValues[i] > transformMax) ? transformValues[i] : transformMax;
                                        transformAvg += transformValues[i];
                                    }
                                    transformAvg /= transformValues.length;
 
                                    //Apply low pass filter below avg value
                                    /*for(int i =0; i < transformValues.length; i++) {
                                        if(transformValues[i] < transformAvg) {
                                            transformValues[i] = 0;
                                        }
                                    }
                                    */
                                    DataPoint[] dataPoints = new DataPoint[transformValues.length];
                                    for (int i = 0; i < transformValues.length; i++) {
                                        dataPoints[i] = new DataPoint((i / 1024f) * 44100f, transformValues[i]);
                                    }
                                    dataGraph.removeAllSeries();
                                    LineGraphSeries<DataPoint> series = new LineGraphSeries<>(dataPoints);
                                    dataGraph.addSeries(series);
 
                                    //Find peaks
                                    List<Integer> peaks = new ArrayList<>();
                                    for (int i = 0; i < transformValues.length - 2; i++) {
                                        float slopeFirst = transformValues[i + 1] - transformValues[i];
                                        float slopeSecond = transformValues[i + 2] - transformValues[i + 1];
                                        float slopeAvg = (slopeFirst - slopeSecond) / 2f;
                                        if (slopeFirst * slopeSecond <= 0) { // changed sign?
                                            if (slopeAvg > transformMax / 6f && transformValues[i + 1] > transformAvg) {
                                                peaks.add(i + 1);
                                            }
                                        }
                                    }
 
                                    //Fill String data about peaks
                                    final AudioManager audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
                                    StringBuilder peakData = new StringBuilder("Peaking at: \n");
                                    boolean lowPass = false, midPass = false;
                                    for (Integer peak : peaks) {
                                        Integer freq = Math.round((peak / 1024f) * 44100f);
                                        if (freq <= 55 && freq >= 35) {
                                            lowPass = true;
                                        }
                                        if (freq <= 56 && freq >= 34) {
                                            midPass = true;
                                        }
                                        peakData.append(freq.toString());
                                        peakData.append("Hz\n");
                                    }
                                    peakText.setText(peakData.toString());
                                    if (lowPass && midPass) {
                                        audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                                                -100, AudioManager.FLAG_SHOW_UI);
                                        final Handler handler = new Handler();
                                        handler.postDelayed(new Runnable() {
                                            @Override
                                            public void run() {
                                                // Do something after 5s = 5000ms
                                                audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                                                        100, AudioManager.FLAG_SHOW_UI);
 
                                            }
                                        }, 2000);
                                    }
                                }
                            }
                        });
 
                    }
                }, 1, 44100);
            }
            toggleThreadButton.setText("Stop Thread");
        }
        else {
            thread.close();
            thread = null;
            toggleThreadButton.setText("Start Thread");
        }
    }
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        toggleThreadButton = findViewById(R.id.mainActivityButtonStartThread);
        peakText = findViewById(R.id.mainActivityTextPeak);
        volumeProgress = findViewById(R.id.mainActivityProgressVolume);
        dataGraph = findViewById(R.id.mainActivityGraphData);
 
        toggleThreadButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                toggleThread();
            }
        });
    }
    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {
        switch (requestCode) {
            case PERMISSION_REQUEST_CALLBACK: {
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    toggleThread();
                }
                else {
                    Toast.makeText(this, "Permission was not granted", Toast.LENGTH_SHORT).show();
                }
            }
        }
    }
 
    @Override
    protected void onStop() {
        thread.close();
        super.onStop();
    }
}
 

Main.java:29: error: class MainActivity is public, should be declared in a file named MainActivity.java
public class MainActivity extends AppCompatActivity {
       ^
Main.java:3: error: package android does not exist
import android.Manifest;
              ^
Main.java:4: error: package android.content.pm does not exist
import android.content.pm.PackageManager;
                         ^
Main.java:5: error: package android.media does not exist
import android.media.AudioManager;
                    ^
Main.java:6: error: package android.os does not exist
import android.os.CountDownTimer;
                 ^
Main.java:7: error: package android.os does not exist
import android.os.Handler;
                 ^
Main.java:8: error: package android.support.annotation does not exist
import android.support.annotation.Nullable;
                                 ^
Main.java:9: error: package android.support.v4.app does not exist
import android.support.v4.app.ActivityCompat;
                             ^
Main.java:10: error: package android.support.v4.content does not exist
import android.support.v4.content.ContextCompat;
                                 ^
Main.java:11: error: package android.support.v7.app does not exist
import android.support.v7.app.AppCompatActivity;
                             ^
Main.java:12: error: package android.os does not exist
import android.os.Bundle;
                 ^
Main.java:13: error: package android.view does not exist
import android.view.View;
                   ^
Main.java:14: error: package android.widget does not exist
import android.widget.Button;
                     ^
Main.java:15: error: package android.widget does not exist
import android.widget.ProgressBar;
                     ^
Main.java:16: error: package android.widget does not exist
import android.widget.TextView;
                     ^
Main.java:17: error: package android.widget does not exist
import android.widget.Toast;
                     ^
Main.java:19: error: package com.jjoe64.graphview does not exist
import com.jjoe64.graphview.GraphView;
                           ^
Main.java:20: error: package com.jjoe64.graphview.series does not exist
import com.jjoe64.graphview.series.DataPoint;
                                  ^
Main.java:21: error: package com.jjoe64.graphview.series does not exist
import com.jjoe64.graphview.series.LineGraphSeries;
                                  ^
Main.java:29: error: cannot find symbol
public class MainActivity extends AppCompatActivity {
                                  ^
  symbol: class AppCompatActivity
Main.java:33: error: cannot find symbol
    Button toggleThreadButton;
    ^
  symbol:   class Button
  location: class MainActivity
Main.java:34: error: cannot find symbol
    TextView peakText;
    ^
  symbol:   class TextView
  location: class MainActivity
Main.java:35: error: cannot find symbol
    ProgressBar volumeProgress;
    ^
  symbol:   class ProgressBar
  location: class MainActivity
Main.java:36: error: cannot find symbol
    GraphView dataGraph;
    ^
  symbol:   class GraphView
  location: class MainActivity
Main.java:38: error: cannot find symbol
    AudioRecorderThread thread;
    ^
  symbol:   class AudioRecorderThread
  location: class MainActivity
Main.java:42: error: cannot find symbol
    FastFourierTransform fastFourierTransform = new FastFourierTransform(1024, 44100);
    ^
  symbol:   class FastFourierTransform
  location: class MainActivity
Main.java:162: error: cannot find symbol
    protected void onCreate(Bundle savedInstanceState) {
                            ^
  symbol:   class Bundle
  location: class MainActivity
Main.java:42: error: cannot find symbol
    FastFourierTransform fastFourierTransform = new FastFourierTransform(1024, 44100);
                                                    ^
  symbol:   class FastFourierTransform
  location: class MainActivity
Main.java:47: error: package Manifest does not exist
                    Manifest.permission.RECORD_AUDIO)
                            ^
Main.java:46: error: cannot find symbol
            if (ContextCompat.checkSelfPermission(this,
                ^
  symbol:   variable ContextCompat
  location: class MainActivity
Main.java:48: error: cannot find symbol
                    != PackageManager.PERMISSION_GRANTED) {
                       ^
  symbol:   variable PackageManager
  location: class MainActivity
Main.java:52: error: package Manifest does not exist
                        new String[]{Manifest.permission.RECORD_AUDIO},
                                             ^
Main.java:51: error: cannot find symbol
                ActivityCompat.requestPermissions(this,
                ^
  symbol:   variable ActivityCompat
  location: class MainActivity
Main.java:56: error: cannot find symbol
                thread = new AudioRecorderThread(new AudioRecorderInterface() {
                             ^
  symbol:   class AudioRecorderThread
  location: class MainActivity
Main.java:56: error: cannot find symbol
                thread = new AudioRecorderThread(new AudioRecorderInterface() {
                                                     ^
  symbol:   class AudioRecorderInterface
  location: class MainActivity
Main.java:161: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:163: error: cannot find symbol
        super.onCreate(savedInstanceState);
        ^
  symbol:   variable super
  location: class MainActivity
Main.java:164: error: package R does not exist
        setContentView(R.layout.activity_main);
                        ^
Main.java:166: error: package R does not exist
        toggleThreadButton = findViewById(R.id.mainActivityButtonStartThread);
                                           ^
Main.java:167: error: package R does not exist
        peakText = findViewById(R.id.mainActivityTextPeak);
                                 ^
Main.java:168: error: package R does not exist
        volumeProgress = findViewById(R.id.mainActivityProgressVolume);
                                       ^
Main.java:169: error: package R does not exist
        dataGraph = findViewById(R.id.mainActivityGraphData);
                                  ^
Main.java:171: error: package View does not exist
        toggleThreadButton.setOnClickListener(new View.OnClickListener() {
                                                      ^
Main.java:178: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:184: error: cannot find symbol
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                                              ^
  symbol:   variable PackageManager
  location: class MainActivity
Main.java:188: error: cannot find symbol
                    Toast.makeText(this, "Permission was not granted", Toast.LENGTH_SHORT).show();
                                                                       ^
  symbol:   variable Toast
  location: class MainActivity
Main.java:188: error: cannot find symbol
                    Toast.makeText(this, "Permission was not granted", Toast.LENGTH_SHORT).show();
                    ^
  symbol:   variable Toast
  location: class MainActivity
Main.java:194: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:197: error: cannot find symbol
        super.onStop();
        ^
  symbol:   variable super
  location: class MainActivity
49 errors

Standard output is empty