本文只讨论如何解决Android TV应用 RecyclerView 焦点乱跑的问题.

RecyclerView的使用方法，大家可以参考此篇博文：http://blog.csdn.net/lmj623565791/article/details/45059587

使用示例：

public static final int ITEMS_COUNT_ONE_LINE = 6;

mRecyclerView = (RecyclerView) root.findViewById(R.id.rv);

mGridLayoutManager = new FocusGridLayoutManager(getContext(), ITEMS_COUNT_ONE_LINE);

mGridLayoutManager.setOrientation(RecyclerView.VERTICAL);

mRecyclerView.setLayoutManager(mGridLayoutManager);

解决此问题的核心是修改 FocusGridLayoutManager

public class FocusGridLayoutManager extends android.support.v7.widget.GridLayoutManager {

}

在此GridlayoutManager中，重载方法onInterceptFocusSearch

@Override

public View onInterceptFocusSearch(View focused, int direction) {

if (direction == View.FOCUS_DOWN) {

int pos = getPosition(focused);

int nextPos = getNextViewPos(pos, direction);

int size = getChildCount();

int count = getItemCount();

if (size > 0) {

int startIndex = 0;

if (size >= mSpanCount) {

startIndex = size - mSpanCount;

}

View view;

for (int i = startIndex; i < size; i++) {

view = getChildAt(i);

if (view == focused) {

int lastVisibleItemPos = findLastCompletelyVisibleItemPosition();

if (pos > lastVisibleItemPos) { //lastVisibleItemPos==-1 ||

return focused;

} else {

int lastLineStartIndex = 0;

if (count >= mSpanCount) {

lastLineStartIndex = count - mSpanCount;

}

if (pos >= lastLineStartIndex && pos < count) { //最后一排的可见view时,返回当前view

return focused;

}

break;

}

}

}

} else {

return focused;

}

}

return super .onInterceptFocusSearch(focused, direction);

}

最核心的是两个地方

1.if (pos > lastVisibleItemPos)  若当前要显示的位置，大于可见的Item的位置，即此时，有可能焦点会乱跑了，此时，返回当前的View作为下一个要Focus的View.

2.if (pos >= lastLineStartIndex && pos < count)  最后一排的可见view时,返回当前view，避免会加载看不见的view,此时也会乱跑。

至此，解决了乱跑问题。其他类型的LayoutManager也可照此方法解决。