Android Open Source - Modulo Tone Gen

• Back to Sound/audio  ↑

From Project

Back to project page Modulo.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.modulo;
/*from  www .  j  a v  a2 s  .c  o m*/
import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.Spinner;
import android.widget.ToggleButton;

public class ToneGen extends Activity
{
  @Override
  protected void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    osc = new Oscillator();

    // View assignments and initial setup
    textHz = (EditText) findViewById(R.id.text_hz);
    textVol = (EditText) findViewById(R.id.text_vol);

    buttonToggle = (ToggleButton) findViewById(R.id.toggle_play);

    seekFreq = (SeekBar) findViewById(R.id.slider_freq);
    // seekFreq starts at Oscillator.MIN_FREQUENCY, so subtract that from
    // its max value
    seekFreq.setMax(Oscillator.MAX_FREQUENCY - Oscillator.MIN_FREQUENCY);
    // Sets the initial seekFreq progress
    seekFreq.setProgress(osc.getFreq() - Oscillator.MIN_FREQUENCY);

    seekVol = (SeekBar) findViewById(R.id.slider_vol);
    seekVol.setMax(100);
    seekVol.setProgress(50);

    spinWave = (Spinner) findViewById(R.id.spinner_wave);
    ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.wave_choices,
        android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinWave.setAdapter(adapter);
  }

  @Override
  protected void onStart() {
    super.onStart();

    // Updates the frequency once the textHz EditText loses focus
    textHz.setOnFocusChangeListener(new View.OnFocusChangeListener() {
      public void onFocusChange(View v, boolean hasFocus) {
        if (!hasFocus) {
          int freqValue = Integer.parseInt(((EditText) v).getText().toString());
          if (freqValue > Oscillator.MAX_FREQUENCY) {
            osc.setFreq(Oscillator.MAX_FREQUENCY);
          }
          else {
            osc.setFreq(freqValue);
          }

          // Since the SeekBar starts at Oscillator.MIN_FREQUENCY, it
          // needs to be subtracted
          // from the value (i.e. 20Hz gets set at 0 on seekFreq)
          seekFreq.setProgress(osc.getFreq() - Oscillator.MIN_FREQUENCY);
        }
      }
    });

    // Updates the volume from textVol once 'enter' has been pressed on the
    // soft keyboard.
    textVol.setOnKeyListener(new View.OnKeyListener() {
      public boolean onKey(View v, int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_ENTER) {
          // Prevents a value greater than 100 from being sent to the
          // volume
          String value = ((EditText) v).getText().toString();
          int volValue = Integer.parseInt(value);
          if (volValue > 100) {
            osc.setVolume(100);
          }
          else {
            osc.setVolume(volValue);
          }
          seekVol.setProgress(osc.getVolume());
          return true;
        }
        else {
          return false;
        }
      }
    });

    // Handles the pausing and playing of the oscillator from the
    // ToggleButton
    buttonToggle.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (buttonView.isChecked()) {
          osc.play();
          new Thread(new Runnable() {
            public void run() {
              // Continuously fills the buffer while the
              // oscillator is playing
              while (osc.getIsPlaying()) {
                osc.fillBuffer();
              }
            }
          }).start();
        }
        else {
          osc.pause();
        }
      }
    });

    // Updates the oscillator's frequency based on the progress of seekFreq
    seekFreq.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
      public void onStopTrackingTouch(SeekBar seekBar) {
      }

      public void onStartTrackingTouch(SeekBar seekBar) {
      }

      public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        osc.setFreq(Oscillator.MIN_FREQUENCY + seekBar.getProgress());
        textHz.setText("" + osc.getFreq());
      }
    });

    // Updates the oscillator's volume based on the progress of seekVol
    seekVol.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener()
    {
      public void onStopTrackingTouch(SeekBar seekBar)
      {
      }

      public void onStartTrackingTouch(SeekBar seekBar)
      {
      }

      public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        osc.setVolume(seekBar.getProgress());
        textVol.setText("" + osc.getVolume());
      }
    });

    // Updates the oscillator's waveform based on the selection in spinWave
    spinWave.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
      public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
        osc.setWave(pos);
      }

      public void onNothingSelected(AdapterView<?> parent) {
      }
    });
  }

  // Stops the oscillator playback and releases the AudioTrack resources
  @Override
  protected void onPause() {
    super.onPause();
    osc.stop();
    buttonToggle.setChecked(false);
  }

  private EditText textHz, textVol;
  private Oscillator osc;
  private ToggleButton buttonToggle;
  private SeekBar seekFreq, seekVol;
  private Spinner spinWave;
}

Java Source Code List

• Back to Sound/audio  ↑