import java.util.ArrayList;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class MultitouchView
extends View {
public static final int MAX_FINGERS = 5;
private Path[] mFingerPaths = new Path[MAX_FINGERS];
private Paint mFingerPaint
; private ArrayList<Path> mCompletedPaths;
private RectF mPathBounds = new RectF();
public MultitouchView
(Context context
) {
super(context);
}
{
super(context, attrs);
}
{
super(context, attrs, defStyle);
}
@Override
protected void onAttachedToWindow()
{
super.onAttachedToWindow();
MainActivity color = new MainActivity();
mCompletedPaths = new ArrayList<Path>();
mFingerPaint
= new Paint(); mFingerPaint.setAntiAlias(true);
mFingerPaint.
setColor(Color.
rgb(color.
r, color.
g, color.
b)); mFingerPaint.setStrokeWidth(6);
mFingerPaint.
setStrokeCap(Paint.
Cap.
BUTT); }
@Override
protected void onDraw
(Canvas canvas
) {
super.onDraw(canvas);
for (Path completedPath : mCompletedPaths)
{
canvas.drawPath(completedPath, mFingerPaint);
}
for (Path fingerPath : mFingerPaths)
{
if (fingerPath != null)
{
canvas.drawPath(fingerPath, mFingerPaint);
}
}
}
@Override
public boolean onTouchEvent(MotionEvent event)
{
int pointerCount = event.getPointerCount();
int cappedPointerCount = pointerCount > MAX_FINGERS ? MAX_FINGERS : pointerCount;
int actionIndex = event.getActionIndex();
int action = event.getActionMasked();
int id = event.getPointerId(actionIndex);
if ((action == MotionEvent.ACTION_DOWN || action == MotionEvent.ACTION_POINTER_DOWN) && id < MAX_FINGERS)
{
mFingerPaths[id] = new Path();
mFingerPaths[id].moveTo(event.getX(actionIndex), event.getY(actionIndex));
}
else if ((action == MotionEvent.ACTION_POINTER_UP || action == MotionEvent.ACTION_UP) && id < MAX_FINGERS)
{
mFingerPaths[id].setLastPoint(event.getX(actionIndex), event.getY(actionIndex));
mCompletedPaths.add(mFingerPaths[id]);
mFingerPaths[id].computeBounds(mPathBounds, true);
invalidate((int) mPathBounds.left, (int) mPathBounds.top,
(int) mPathBounds.right, (int) mPathBounds.bottom);
mFingerPaths[id] = null;
}
for(int i = 0; i < cappedPointerCount; i++)
{
if(mFingerPaths[i] != null)
{
int index = event.findPointerIndex(i);
mFingerPaths[i].lineTo(event.getX(index), event.getY(index));
mFingerPaths[i].computeBounds(mPathBounds, true);
invalidate((int) mPathBounds.left, (int) mPathBounds.top,
(int) mPathBounds.right, (int) mPathBounds.bottom);
}
}
return true;
}
}
