問題描述
android中的ontouch：獲取X和Y坐標並在該點上繪製圓 (ontouch in android: getting X and Y coordinates and drawing circle on that point)
in my application on ontouch of screen i'm getting the coordinates(x.y), after that on that position i'm drawing a circle.but when i'm drawing a circle on that position.it always draw a circle on upper left side corner of images on some pt.s .i'm not getting why this is happening.please help me.
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto‑generated method stub
if(event.getAction()==MotionEvent.ACTION_UP) {
Log.d("position", event.getX() + "‑" + event.getY());
System.out.println("bitmap......"+paths[0]+"draw...."+dd);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(getResources().getColor(R.color.Yellow)) ;
paint.setAlpha(opacity);
// create canvas to draw on the bitmap
Canvas canvas = new Canvas(mutbit);
canvas.drawCircle(event.getX(),event.getY(), 10, paint);
im.setAdjustViewBounds(true);
im.setImageBitmap(mutbit);
dd[1]=im.getDrawable();
Bitmap aa=mutbit.copy(Bitmap.Config.ARGB_4444,false);//mutbit=bb[tabCount].copy(Bitmap.Config.ARGB_4444, true);
bb[1]=aa;
return true;
}
return false;
}
‑‑‑‑‑
參考解法
方法 1:
Try this draw circle on Action down event.getAction()==MotionEvent.ACTION_UP to event.getAction() == MotionEvent.ACTION_DOWN
(by yuva ツ、ShreeshaDas)