Android Two finger rotation

Improvements of the class: angle returned is total since rotation has begun removing unnecessary functions simplification get position of first pointer only after second pointer is down public class RotationGestureDetector { private static final int INVALID_POINTER_ID = -1; private float fX, fY, sX, sY; private int ptrID1, ptrID2; private float mAngle; private OnRotationGestureListener mListener; public … Read more

How to detect Swipe Gesture in iOS?

If You know how it works, but still need a quick example, here it is! (it will become handy at least for me, when I will need copy-paste example, without trying remembering it) UISwipeGestureRecognizer *mSwipeUpRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(doSomething)]; [mSwipeUpRecognizer setDirection:(UISwipeGestureRecognizerDirectionUp | UISwipeGestureRecognizerDirectionDown | UISwipeGestureRecognizerDirectionLeft | UISwipeGestureRecognizerDirectionRight)]; [[self view] addGestureRecognizer:mSwipeUpRecognizer]; and in .h file … Read more

How to programmatically trigger the touch event in android?

// Obtain MotionEvent object long downTime = SystemClock.uptimeMillis(); long eventTime = SystemClock.uptimeMillis() + 100; float x = 0.0f; float y = 0.0f; // List of meta states found here: int metaState = 0; MotionEvent motionEvent = MotionEvent.obtain( downTime, eventTime, MotionEvent.ACTION_UP, x, y, metaState ); // Dispatch touch event to view view.dispatchTouchEvent(motionEvent);

In iOS, how to drag down to dismiss a modal?

I just created a tutorial for interactively dragging down a modal to dismiss it. I found this topic to be confusing at first, so the tutorial builds this out step-by-step. If you just want to run the code yourself, this is the repo: This is the approach I used: View Controller You override … Read more

Long press on UITableView

First add the long press gesture recognizer to the table view: UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)]; lpgr.minimumPressDuration = 2.0; //seconds lpgr.delegate = self; [self.myTableView addGestureRecognizer:lpgr]; [lpgr release]; Then in the gesture handler: -(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer { CGPoint p = [gestureRecognizer locationInView:self.myTableView]; NSIndexPath *indexPath = [self.myTableView indexPathForRowAtPoint:p]; if (indexPath == nil) { NSLog(@”long press on … Read more

UILongPressGestureRecognizer gets called twice when pressing down

UILongPressGestureRecognizer is a continuous event recognizer. You have to look at the state to see if this is the start, middle or end of the event and act accordingly. i.e. you can throw away all events after the start, or only look at movement as you need. From the Class Reference: Long-press gestures are continuous. … Read more

How to simulate a touch event in Android?

Valentin Rocher’s method works if you’ve extended your view, but if you’re using an event listener, use this: view.setOnTouchListener(new OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { Toast toast = Toast.makeText( getApplicationContext(), “View touched”, Toast.LENGTH_LONG );; return true; } }); // Obtain MotionEvent object long downTime = SystemClock.uptimeMillis(); long eventTime = SystemClock.uptimeMillis() + … Read more

Draw on HTML5 Canvas using a mouse

Here is a working sample. <html> <script type=”text/javascript”> var canvas, ctx, flag = false, prevX = 0, currX = 0, prevY = 0, currY = 0, dot_flag = false; var x = “black”, y = 2; function init() { canvas = document.getElementById(‘can’); ctx = canvas.getContext(“2d”); w = canvas.width; h = canvas.height; canvas.addEventListener(“mousemove”, function (e) { … Read more