android ListView TV 通过遥控器上下 smooth滑动

直接上代码
import java.util.Timer;import java.util.TimerTask;import android.content.Context;import android.util.AttributeSet;import android.view.KeyEvent;import android.view.View;import android.view.View.OnKeyListener;import android.widget.ListAdapter;import android.widget.ListView;import com.letv.tvos.lechou.utils.LogCat;public class SmoothScrollListView extends ListView implements OnKeyListener {private int itemsCount;private int itemHeight;private ListAdapter adapter;private int scrollDuration = 1000;private boolean isScrollTop;    private Timer timer;private OnScrollBottomListener onScrollBottomListener;private OnScrollTopListener onScrollTopListener;public SmoothScrollListView(Context context) {this(context, null);}public SmoothScrollListView(Context context, AttributeSet attrs) {super(context, attrs);this.setOnKeyListener(this);this.setSmoothScrollbarEnabled(true);}@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {super.onLayout(changed, l, t, r, b);if (adapter != null) {//获取每个item 的高度，因为要调用滑动的方法，每次滑动的距离就是item 的高度itemHeight = this.getChildAt(0).getHeight();}}@Overridepublic void setAdapter(ListAdapter adapter) {super.setAdapter(adapter);this.adapter = adapter;//获取listview  item的count，一定要是由adapter获得，不能通过listView，因为listView是动态添加删除孩子的，可以打印一下比较看看itemsCount = adapter.getCount();}/** * 设置滚动动画的滚动时间 *  * @param scrollDutation */public void setScrollDuration(int scrollDutation) {this.scrollDuration = scrollDutation;}@Overridepublic boolean onKey(View v, int keyCode, KeyEvent event) {if (event.getAction() == KeyEvent.ACTION_UP) {return false;}//获取当前被选中的状态int currentItemPosition = this.getSelectedItemPosition();if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {//当时倒数第二个的时候if (currentItemPosition == itemsCount - 2) {//如果listView的最后一个可见Item是倒数第二个item，或者是倒数第一个item同时timer不为空，这时要滚动一次，并让最后一个item获取焦点if(this.getLastVisiblePosition() == itemsCount - 2 || (this.getLastVisiblePosition() == itemsCount - 1 && timer != null)){LogCat.e("倒数第二个");this.smoothScrollBy(itemHeight, scrollDuration);if(timer == null){smoothScrollToBottom();}else{timer.cancel();timer = null;//延迟一下，再让最后一个item编程selected状态，不让没有动画，太突兀smoothScrollToBottom();}//this.smoothScrollToPositionFromTop(itemsCount - 1, 0, scrollDuration);//this.setSelection(itemsCount - 1);}return false;} else if (currentItemPosition == itemsCount - 1) {//当是最后一个item是selectionItem，则给出回调，让他不要在滚动了if (onScrollBottomListener != null) {onScrollBottomListener.onScrollBottom();}return true;} else {//是中间其他状态的时候，滚动一个item的距离this.smoothScrollBy(itemHeight, scrollDuration);//this.smoothScrollToPositionFromTop(currentItemPosition + 1, 0, scrollDuration);return false;}}if (keyCode == KeyEvent.KEYCODE_DPAD_UP) {if (currentItemPosition == 1) {if(this.getChildAt(0).isFocusable() == false){this.smoothScrollBy(-itemHeight, scrollDuration);}return false;} else if (currentItemPosition == 0) {if (onScrollTopListener != null) {onScrollTopListener.onScrollTop();}return isScrollTop;} else {this.smoothScrollBy(-itemHeight, scrollDuration);return false;}}return false;}private void smoothScrollToBottom(){LogCat.e("平滑移动到最后");timer = new Timer();timer.schedule(new TimerTask() {@Overridepublic void run() {SmoothScrollListView.this.post(new Runnable() {@Overridepublic void run() {SmoothScrollListView.this.setSelection(SmoothScrollListView.this.getLastVisiblePosition());}});}}, scrollDuration / 3);}/** * 当滚动到底部的时候的监听 */public interface OnScrollBottomListener {void onScrollBottom();}public void setOnScrollBottomListener(OnScrollBottomListener onScrollBottomListener) {this.onScrollBottomListener = onScrollBottomListener;}/** * 当滚动到顶部的时候的监听 */public interface OnScrollTopListener {void onScrollTop();}public void setOnScrollTopListener(OnScrollTopListener onScrollTopListener) {isScrollTop = true;this.onScrollTopListener = onScrollTopListener;}}
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