android - StartActivityfor result in customview -


i want invoke startactivity result when singletap on view detected.

for singletap on view, wrote follwing condition in ontouch method of view

@override public boolean ontouchevent(motionevent ev) {   if (!msupportszoom && !msupportspan) return false;   mscaledetector.ontouchevent(ev);  final int action = ev.getaction(); switch (action & motionevent.action_mask) { case motionevent.action_down: {     final float x = ev.getx();     final float y = ev.gety();      mlasttouchx = x;     mlasttouchy = y;     mactivepointerid = ev.getpointerid(0);      break; }  case motionevent.action_move: {     final int pointerindex = ev.findpointerindex(mactivepointerid);     final float x = ev.getx(pointerindex);     final float y = ev.gety(pointerindex);      if (msupportspan && !mscaledetector.isinprogress()) {         final float dx = x - mlasttouchx;         final float dy = y - mlasttouchy;          mposx += dx;         mposy += dy;         //mfocusx = mposx;         //mfocusy = mposy;          invalidate();     }      mlasttouchx = x;     mlasttouchy = y;      break; }  case motionevent.action_up: {      final float x = ev.getx();     final float y = ev.gety();      touchupx=x;     touchupy=y;      if(mlasttouchx == touchupx && mlasttouchy == touchupy){ //this condition detect single tap on view          pinchzoompanactivity2.tapped(null, 100); //method startactivityfor result in main activity      }      mactivepointerid = invalid_pointer_id;     break; }  case motionevent.action_cancel: {     mactivepointerid = invalid_pointer_id;     break; }  case motionevent.action_pointer_up: {     final int pointerindex = (ev.getaction() & motionevent.action_pointer_index_mask)              >> motionevent.action_pointer_index_shift;     final int pointerid = ev.getpointerid(pointerindex);     if (pointerid == mactivepointerid) {          final int newpointerindex = pointerindex == 0 ? 1 : 0;         mlasttouchx = ev.getx(newpointerindex);         mlasttouchy = ev.gety(newpointerindex);         mactivepointerid = ev.getpointerid(newpointerindex);     }     break; } }  return true; }

and tapped method in mainactivity follows

static void tapped(activity activity, int requestcode){  activity.startactivityforresult(new intent(intent.action_pick, android.provider.mediastore.images.media.internal_content_uri), 1); }

but not work forecloses error null pointer exception.

please suggest wrong code.

pinchzoompanactivity2.tapped(null, 100);

you're passing in null activity. tapped function tries call startactivityforresult on , fails because null.


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