本文实例讲述了android实现自动滚动的Gallary控件。分享给大家供大家参考。具体如下:
import java.util.Timer;import java.util.TimerTask;import android.content.Context;import android.os.Handler;import android.util.AttributeSet;import android.util.Log;import android.view.KeyEvent;import android.view.MotionEvent;import android.widget.Gallery;public class HomeGallery extends Gallery{/** * 这里的数值,限制了每次滚动的最大长度,图片宽度为480PX。这里设置600效果好一些。 这个值越大,滚动的长度就越大。 * 也就是会出现一次滚动跨多个Image。这里限制长度后,每次滚动只能跨一个Image */private static final int timerAnimation = 1;private static final int time = 2000;private final Handler mHandler = new Handler(){public void handleMessage(android.os.Message msg){switch (msg.what){case timerAnimation:int position = getSelectedItemPosition();Log.i("msg", "position:"+position);if (position >= (getCount() - 1)){onKeyDown(KeyEvent.KEYCODE_DPAD_LEFT, null);} else{onKeyDown(KeyEvent.KEYCODE_DPAD_RIGHT, null);}break;default:break;}};};private final Timer timer = new Timer();private final TimerTask task = new TimerTask(){public void run(){mHandler.sendEmptyMessage(timerAnimation);}};public HomeGallery(Context paramContext){super(paramContext);timer.schedule(task, time, time);}public HomeGallery(Context paramContext, AttributeSet paramAttributeSet){super(paramContext, paramAttributeSet);timer.schedule(task, time, time);}public HomeGallery(Context paramContext, AttributeSet paramAttributeSet,int paramInt){super(paramContext, paramAttributeSet, paramInt);timer.schedule(task, time, time);}private boolean isScrollingLeft(MotionEvent paramMotionEvent1,MotionEvent paramMotionEvent2){float f2 = paramMotionEvent2.getX();float f1 = paramMotionEvent1.getX();if (f2 > f1)return true;return false;}public boolean onFling(MotionEvent paramMotionEvent1,MotionEvent paramMotionEvent2, float paramFloat1, float paramFloat2){int keyCode;if (isScrollingLeft(paramMotionEvent1, paramMotionEvent2)){keyCode = KeyEvent.KEYCODE_DPAD_LEFT;} else{keyCode = KeyEvent.KEYCODE_DPAD_RIGHT;}onKeyDown(keyCode, null);return true;}public void destroy(){timer.cancel();}}
希望本文所述对大家的Android程序设计有所帮助。