0
我在用於線性佈局的觸摸偵聽器中的一篇文章中發現了此代碼。 在線性佈局中有一些兒童佈局，每個人都會發出相同的聲音，但有音調。現在我怎麼能用每個孩子發揮不同的聲音。 另一個詞我怎樣才能訪問每個孩子？在佈局中使用每個孩子
public class MainActivity extends Activity {
LinearLayout pianoKeysContainer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
pianoKeysContainer = (LinearLayout) findViewById(R.id.key_container);
pianoKeysContainer.setOnTouchListener(onYourViewTouchListener);
}
//Here we load the view positions after render it and fill the array with the positions
private List<Integer> positionsLeft_whiteKeys = new ArrayList<Integer>();
private List<Integer> positionsRight_whiteKeys = new ArrayList<Integer>();
public void onWindowFocusChanged(boolean hasFocus)
{
super.onWindowFocusChanged(hasFocus);
for (int i = 0; i < pianoKeysContainer.getChildCount(); i++)
{
//positionsLeft_whiteKeys holds the start x of each view.
positionsLeft_whiteKeys.add(pianoKeysContainer.getChildAt(i).getLeft());
//positionsRight_whiteKeys holds the end x of each view.
positionsRight_whiteKeys.add(pianoKeysContainer.getChildAt(i).getRight());
}
}
public View.OnTouchListener onYourViewTouchListener = new View.OnTouchListener()
{
float positionX;
FrameLayout pianoKey;
FrameLayout lastPlayedKey;
ArrayList<FrameLayout> pressedKeys = new ArrayList<FrameLayout>();
@Override
public boolean onTouch(View view, MotionEvent motionEvent)
{
positionX = motionEvent.getX();
float pitch;
//Looping on the child of the layout which contains the piano keys
for (int x = 0; x < ((LinearLayout) view).getChildCount(); x++)
{
// Calculating the pitch to get good chords
pitch = (float) Math.pow(Math.pow(2.0, 1/12.0), (float) x);
pianoKey = (FrameLayout) ((LinearLayout) view).getChildAt(x);
if (positionsLeft_whiteKeys.size() >= 0 && positionsRight_whiteKeys.size() >= 0)
{
if (positionX > positionsLeft_whiteKeys.get(x) && positionX < positionsRight_whiteKeys.get(x))
{
pianoKey = (FrameLayout) ((LinearLayout) view).getChildAt(x);
if (pianoKey != null)
{
pianoKey.setBackgroundResource(R.drawable.dinger14);
pressedKeys.add(pianoKey);
}
if (lastPlayedKey != pianoKey)
playKey(pitch);
lastPlayedKey = pianoKey;
break;
}
if (lastPlayedKey != null)
{
pianoKey.setBackgroundResource(R.drawable.dinger14);
lastPlayedKey.setBackgroundResource(R.drawable.dinger14);
}
}
}
if (motionEvent.getAction() == MotionEvent.ACTION_UP)
{
lastPlayedKey = null;
for (FrameLayout pressedKey : pressedKeys)
{
pressedKey.setBackgroundResource(R.drawable.dinger14);
}
}
return false;
}
};
//This is sound play method
SoundPool sp = new SoundPool(1, AudioManager.STREAM_MUSIC, 1);
public void playKey(final float pitch)
{
//here you should store your piano sound at res/raw then load it
sp.load(this, R.raw.chitare3, 1);
sp.setOnLoadCompleteListener(new SoundPool.OnLoadCompleteListener()
{
@Override
public void onLoadComplete(SoundPool soundPool, int i, int i2)
{
soundPool.play(i, 0.99f, 0.99f, 1, 0, pitch);
}
});
}
}