StackOverflow2013

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2013-10-04T17:00:26.193
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2013-10-04T17:14:03.243
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Here is how I did it: I made an observable scroll view class. <pre><code>public class ObservableScrollView extends ScrollView{ private ScrollViewListener scrollViewListener = null; public ObservableScrollView(Context context) { super(context); } public ObservableScrollView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public ObservableScrollView(Context context, AttributeSet attrs) { super(context, attrs); } public void setScrollViewListener(ScrollViewListener scrollViewListener) { this.scrollViewListener = scrollViewListener; } @Override protected void onScrollChanged(int x, int y, int oldx, int oldy) { super.onScrollChanged(x, y, oldx, oldy); if(scrollViewListener != null) { scrollViewListener.onScrollChanged(this, x, y, oldx, oldy); } } </code></pre> } I created a new interface called Scroll View Listener. <pre><code>public interface ScrollViewListener { void onScrollChanged(ObservableScrollView scrollView, int x, int y, int oldx, int oldy); </code></pre> } Then in the activity I implemented this interface. <pre><code>public class MainActivity extends Activity implements ScrollViewListener { </code></pre> Then it will force you to use the following method. <pre><code>// scroll view listener. used to load new page if user scrolls to bottom @Override public void onScrollChanged(ObservableScrollView scrollView, int x, int y, int oldx, int oldy) { View view = (View) scrollView .getChildAt(scrollView.getChildCount() - 1); int diff = (view.getBottom() - (scrollView.getHeight() + scrollView .getScrollY())); if (diff <= DISTANCE_FROM_BOTTOM) { LOADNEXTTHINGS(); } } </code></pre> The <code>DISTANCE_FROM_BOTTOM</code> is in pixels if I remember correctly. Keep in mind that <code>LOADNEXTTHINGS()</code> will be called if the user is changing the scroll position and in the range that is between <code>diff <= DISTANCE_FROM_BOTTOM</code>. You should have a loading value to control this... like <pre><code>if(diff <= DISTANCE_FROM_BOTTOM && !loadingNextThings){ loadingNextThings = true; LOADNEXTTHINGS(); } </code></pre> then when you are done loading next things do <code>loadingNextThings = false;</code> Personally, I prefer using FSMs.
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