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PODetect touch press vs long press vs movement?
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copied!<p>I'm currently fiddling around with Android programming, but I have a small problem detecting different touch events, namely a normal touch press (press on the screen and release right away), a long press (touch the screen and hold the finger on it) and movement (dragging on the screen).</p> <p>What I wanted to do is have an image (of a circle) on my screen which I can drag around. Then when I press it once (short/normal press) a Toast comes up with some basic information about it. When I long press it, an AlertDialog with a list comes up to select a different image (circle, rectangle or triangle).</p> <p>I made a custom View with my own OnTouchListener to detect the events and draw the image in onDraw. The OnTouchListener.onTouch goes something like this:</p> <pre><code>// has a touch press started? private boolean touchStarted = false; // co-ordinates of image private int x, y; public boolean onTouch(View v, MotionEvent event) { int action = event.getAction(); if (action == MotionEvent.ACTION_DOWN) { touchStarted = true; } else if (action == MotionEvent.ACTION_MOVE) { // movement: cancel the touch press touchStarted = false; x = event.getX(); y = event.getY(); invalidate(); // request draw } else if (action == MotionEvent.ACTION_UP) { if (touchStarted) { // touch press complete, show toast Toast.makeText(v.getContext(), "Coords: " + x + ", " + y, 1000).show(); } } return true; } </code></pre> <p>The problem is that the press doesn't quite work as expected, because when I casually touch the screen it also detects a tiny bit of movement and cancels the touch press and moves around the image instead.</p> <p>I "hacked" around this a bit my introducing a new variable "mTouchDelay" which I set to 0 on ACTION_DOWN, increase in MOVE and if it's >= 3 in MOVE I execute my "move" code. But I have a feeling this isn't really the way to go.</p> <p>I also haven't found out how to detect a long press. The culprit really is the MOVE which seems to always trigger.</p> <p>For an example of what I roughly want, see the Android application "DailyStrip": it shows an image of a comic strip. You can drag it if it's too large for the screen. You can tap it once for some controls to pop-up and long press it for an options menu.</p> <p>PS. I'm trying to get it to work on Android 1.5, since my phone only runs on 1.5.</p>

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