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POAndroid issue: View with endless scrolling
 

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    <p>I have a custom View with scroll implemented, but it seems like an ENDLESS scrolling over the image.<br> Even when I find the edge of the image, it keeps scrolling to a blank background.</p> <p>I can't use a WebView because I also have some Canvas sutff.<br> Does anyone know how to set limits for this issue? <br> How to fit the edges of the image for the scrolling?<br> <br><br> <strong>EDIT:</strong> I found the best solution with @JosephEarl help.<br> I set just left and top bounds because my image is larger than the screen.<br> Also I <em>turn off</em> the bounds while using the zoom funcionality, otherwise I couldn't move it anymore.<br><br> <strong>1) In the ACTION_MOVE case of your <em>onTouch</em> event, inser this code:</strong></p> <pre><code>if(!isZoomed) { if(mPosX &lt; 0) mPosX = 0; else if(mPosX &gt; mWidth) mPosX = mWidth; if(mPosY &lt; 0) mPosY = 0; else if(mPosY &gt; mHeight) mPosY = mHeight; } </code></pre> <p><br><strong>2) <em>Turn on</em> or <em>turn off</em> the bounds while zoom is used.<br> Add the following code to your ACTION_POINTER_UP case:</strong></p> <pre><code>case MotionEvent.ACTION_POINTER_UP: { final int pointerIndex = (ev.getAction() &amp; MotionEvent.ACTION_POINTER_INDEX_MASK) &gt;&gt; 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); isZoomed = true; } else isZoomed = false; break; } </code></pre> <p><br> And that's all. <br> Here is all the related methods and complete <em>onTouch</em> event:<br></p> <pre><code>private float scaleFactor = 1.f; private ScaleGestureDetector detector; private static final int INVALID_POINTER_ID = -1; private int mActivePointerId = INVALID_POINTER_ID; private float mPosX; private float mPosY; private float mLastTouchX; private float mLastTouchY; private float mWidth; private float mHeight; private boolean isZoomed = false; // OTHER CODE GOES HERE @Override public boolean onTouchEvent(MotionEvent ev) { detector.onTouchEvent(ev); final int action = ev.getAction(); switch (action &amp; 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 (!detector.isInProgress()) { final float dx = x - mLastTouchX; final float dy = y - mLastTouchY; mPosX += dx; mPosY += dy; if(!isZoomed) { if(mPosX &lt; 0) mPosX = 0; else if(mPosX &gt; mWidth) mPosX = mWidth; if(mPosY &lt; 0) mPosY = 0; else if(mPosY &gt; mHeight) mPosY = mHeight; } invalidate(); } mLastTouchX = x; mLastTouchY = y; break; } case MotionEvent.ACTION_UP: { mActivePointerId = INVALID_POINTER_ID; break; } case MotionEvent.ACTION_CANCEL: { mActivePointerId = INVALID_POINTER_ID; break; } case MotionEvent.ACTION_POINTER_UP: { final int pointerIndex = (ev.getAction() &amp; MotionEvent.ACTION_POINTER_INDEX_MASK) &gt;&gt; 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); isZoomed = true; } else isZoomed = false; break; } } return true; } private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener { @Override public boolean onScale(ScaleGestureDetector detector) { scaleFactor *= detector.getScaleFactor(); scaleFactor = Math.max(MIN_ZOOM, Math.min(scaleFactor, MAX_ZOOM)); invalidate(); return true; } } @Override protected void onSizeChanged(int xNew, int yNew, int xOld, int yOld){ super.onSizeChanged(xNew, yNew, xOld, yOld); mWidth = xNew; mHeight = yNew; } // OTHER CODE GOES HERE </code></pre>
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    1. USRayssa Küllian
    1. USRayssa Küllian
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