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：
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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();
}
}
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希望本文所述对大家的Android程序设计有所帮助。