Android Open Source - dynamic-sound-android Keys View

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License

The source code is released under:

MIT License

Java Source Code

package com.tackmobile.androidpiano.view;
//from w  ww  .j  a  v  a 2 s  .c  o m
import com.tackmobile.androidpiano.audio.PdInterface;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;

public class KeysView extends ViewGroup implements OnTouchListener {

  private Key[] whiteKeys;
  private Key[] blackKeys;

  public KeysView(Context context, AttributeSet attrs) {
    super(context, attrs);
    setBackgroundColor(context.getResources().getColor(android.R.color.black));
    blackKeys = new Key[5];
    whiteKeys = new Key[7];
    for (int i = 0; i < 7; i++) {
      whiteKeys[i] = new Key(context, 60, false);
      whiteKeys[i].setOnTouchListener(this);
      addView(whiteKeys[i]);
    }
    for (int i = 0; i < 5; i++) {
      blackKeys[i] = new Key(context, 66, true);
      blackKeys[i].setOnTouchListener(this);
      addView(blackKeys[i]);
    }
    whiteKeys[0].setMidiNote(60);
    blackKeys[0].setMidiNote(61);
    whiteKeys[1].setMidiNote(62);
    blackKeys[1].setMidiNote(63);
    whiteKeys[2].setMidiNote(64);
    whiteKeys[3].setMidiNote(65);
    blackKeys[2].setMidiNote(66);
    whiteKeys[4].setMidiNote(67);
    blackKeys[3].setMidiNote(68);
    whiteKeys[5].setMidiNote(69);
    blackKeys[4].setMidiNote(70);
    whiteKeys[6].setMidiNote(71);
  }
  
  @Override public boolean onTouch(View v, MotionEvent event) {
    Key key = (Key)v;
    if (event.getAction() == MotionEvent.ACTION_DOWN) {
      int note = key.getMidiNote();
      PdInterface.getInstance().gateOn(note);
      return true;
    } else if (event.getAction() == MotionEvent.ACTION_UP) {
      PdInterface.getInstance().gateOff();
      return true;
    }
    return false;
  }

  @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
    int height  = getHeight();
    int whiteKeyHeight = height/7;
    int currentKeyBottom = getBottom();
    for (int i = 0; i < whiteKeys.length; i++) {
      whiteKeys[i].setLeft(0);
      whiteKeys[i].setRight(getRight());
      whiteKeys[i].setTop(currentKeyBottom - whiteKeyHeight - i);
      whiteKeys[i].setBottom(currentKeyBottom - i);
      currentKeyBottom -= whiteKeyHeight;
    }
    int t, b;
    int r = getRight() - (int)(getWidth()*0.3);
    Key whiteKey = whiteKeys[0];
    b = whiteKey.getBottom() - (int)(whiteKey.getHeight()/1.5);
    whiteKey = whiteKeys[1];
    t = whiteKey.getTop() + (int)(whiteKey.getHeight()/1.5);
    blackKeys[0].setTop(t);
    blackKeys[0].setBottom(b);
    blackKeys[0].setLeft(0);
    blackKeys[0].setRight(r);
    b = whiteKey.getBottom() - (int)(whiteKey.getHeight()/1.5);
    whiteKey = whiteKeys[2];
    t = whiteKey.getTop() + (int)(whiteKey.getHeight()/1.5);
    blackKeys[1].setTop(t);
    blackKeys[1].setBottom(b);
    blackKeys[1].setLeft(0);
    blackKeys[1].setRight(r);
    whiteKey = whiteKeys[3];
    b = whiteKey.getBottom() - (int)(whiteKey.getHeight()/1.5);
    whiteKey = whiteKeys[4];
    t = whiteKey.getTop() + (int)(whiteKey.getHeight()/1.5);
    blackKeys[2].setTop(t);
    blackKeys[2].setBottom(b);
    blackKeys[2].setLeft(0);
    blackKeys[2].setRight(r);
    b = whiteKey.getBottom() - (int)(whiteKey.getHeight()/1.5);
    whiteKey = whiteKeys[5];
    t = whiteKey.getTop() + (int)(whiteKey.getHeight()/1.5);
    blackKeys[3].setTop(t);
    blackKeys[3].setBottom(b);
    blackKeys[3].setLeft(0);
    blackKeys[3].setRight(r);
    b = whiteKey.getBottom() - (int)(whiteKey.getHeight()/1.5);
    whiteKey = whiteKeys[6];
    t = whiteKey.getTop() + (int)(whiteKey.getHeight()/1.5);
    blackKeys[4].setTop(t);
    blackKeys[4].setBottom(b);
    blackKeys[4].setLeft(0);
    blackKeys[4].setRight(r);
  }



}

Java Source Code List

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