问题
I am developing an App that need to detect the stylus's size, for instance, if I use my hand(relatively wide) to draw, return null, if I use the stylus(relatively small) to draw, execute draw.Point method.
I have no idea how to detect this. Please for help thanks.
My code list as below.
public PaintView(Context context) {
super(context);
paint=new Paint(Paint.DITHER_FLAG);
bitmap = Bitmap.createBitmap(MainActivity.widthPixels, MainActivity.heightPixels, Bitmap.Config.ARGB_8888);
canvas=new Canvas();
canvas.setBitmap(bitmap);
paint.setStyle(Paint.Style.STROKE);
//float size = paint.getStrokeWidth();
paint.setStrokeWidth(5);
paint.setColor(Color.RED);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawBitmap(bitmap,0,0,null);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction()==MotionEvent.ACTION_MOVE) {
canvas.drawLine(mov_x, mov_y, event.getX(), event.getY(), paint);
invalidate();
}
if (event.getAction()==MotionEvent.ACTION_DOWN) {
mov_x=(int) event.getX();
mov_y=(int) event.getY();
canvas.drawPoint(mov_x, mov_y, paint);
invalidate();
}
mov_x=(int) event.getX();
mov_y=(int) event.getY();
return true;
}
回答1:
You can use MotionEvent.getSize() method to detect sizes of finger and stylus touch and then create rule how to determine what caused the touch. Also MotionEvent.getPressure() may be useful.
来源:https://stackoverflow.com/questions/41238867/how-do-i-get-android-paintstylus-size