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在Android TV上一般选中某个View, 都会有焦点突出放大的效果, 但是当在RecyclerView中(ListView或GridView)实现当item View执行放大动画后会被其他的item View遮挡.
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原因是: RecyclerView的机制是越靠后的View z-order越高, 所以bringToFront方法是不管用的.
在实现针对TV端的自定义控件 TvRecyclerView 时遇到此问题, 最后的解决方案是:
自定义RecyclerView, 重写getChildDrawingOrder方法, 让选中的item最后绘制, 这样就不会让其他view遮挡.
public class ScaleRecyclerView extends RecyclerView {
private int mSelectedPosition = 0;
public ScaleRecyclerView(Context context) {
super(context);
init();
}
public ScaleRecyclerView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public ScaleRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
//启用子视图排序功能
setChildrenDrawingOrderEnabled(true);
}
@Override
public void onDraw(Canvas c) {
mSelectedPosition = getChildAdapterPosition(getFocusedChild());
super.onDraw(c);
}
@Override
protected int getChildDrawingOrder(int childCount, int i) {
int position = mSelectedPosition;
if (position < 0) {
return i;
} else {
if (i == childCount - 1) {
if (position > i) {
position = i;
}
return position;
}
if (i == position) {
return childCount - 1;
}
}
return i;
}
}
最好还需要设置RecyclerView的父类的属性: clipChildren = false, clipToPadding = false, 避免边缘的子view被父类遮挡.
使用介绍:
(1) 自定具有放大缩小的布局:
public class FocusRelativeLayout extends RelativeLayout {
private Animation scaleSmallAnimation;
private Animation scaleBigAnimation;
public FocusRelativeLayout(Context context) {
super(context);
}
public FocusRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public FocusRelativeLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
if (gainFocus) {
getRootView().invalidate();
zoomOut();
} else {
zoomIn();
}
}
private void zoomIn() {
if (scaleSmallAnimation == null) {
scaleSmallAnimation = AnimationUtils.loadAnimation(getContext(), R.anim.anim_scale_small);
}
startAnimation(scaleSmallAnimation);
}
private void zoomOut() {
if (scaleBigAnimation == null) {
scaleBigAnimation = AnimationUtils.loadAnimation(getContext(), R.anim.anim_scale_big);
}
startAnimation(scaleBigAnimation);
}
}
(2) 放大动画xml配置如下:
<?xml version="1.0" encoding="utf-8"?>
(3) 主布局xml:
<?xml version="1.0" encoding="utf-8"?>
(4) 子视图的xml:
(5) adapter配置:
public class MyAdapter extends RecyclerView.Adapter{ private Context mContext; private OnItemStateListener mListener; private static int[] mColorIds = {R.color.amber, R.color.brown, R.color.cyan, R.color.deepPurple, R.color.green, R.color.lightBlue, R.color.lightGreen, R.color.lime, R.color.orange, R.color.pink, R.color.cyan, R.color.deepPurple}; MyAdapter(Context context) { mContext = context; } public void setOnItemStateListener(OnItemStateListener listener) { mListener = listener; } @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { return new RecyclerViewHolder(View.inflate(mContext, R.layout.item_recyclerview, null)); } @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) { final RecyclerViewHolder viewHolder = (RecyclerViewHolder) holder; viewHolder.mRelativeLayout.setBackgroundColor(ContextCompat.getColor(mContext, mColorIds[position])); } @Override public int getItemCount() { return mColorIds.length; } private class RecyclerViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { FocusRelativeLayout mRelativeLayout; RecyclerViewHolder(View itemView) { super(itemView); mRelativeLayout = (FocusRelativeLayout) itemView.findViewById(R.id.rl_main_layout); mRelativeLayout.setOnClickListener(this); } @Override public void onClick(View v) { if (mListener != null) { mListener.onItemClick(v, getAdapterPosition()); } } } public interface OnItemStateListener { void onItemClick(View view, int position); } }
(6) Activity中的配置:
public class RecyclerActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recycler);
final ScaleRecyclerView recyclerView = (ScaleRecyclerView) findViewById(R.id.main_recyclerView);
GridLayoutManager manager = new GridLayoutManager(RecyclerActivity.this, 1);
manager.setOrientation(LinearLayoutManager.HORIZONTAL);
manager.supportsPredictiveItemAnimations();
recyclerView.setLayoutManager(manager);
int itemSpace = getResources().
getDimensionPixelSize(R.dimen.recyclerView_item_space);
recyclerView.addItemDecoration(new SpaceItemDecoration(itemSpace));
final MyAdapter mAdapter = new MyAdapter(RecyclerActivity.this);
recyclerView.setAdapter(mAdapter);
}
private class SpaceItemDecoration extends RecyclerView.ItemDecoration {
private int space;
SpaceItemDecoration(int space) {
this.space = space;
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
RecyclerView.State state) {
outRect.left = space;
}
}
}
效果图如下:
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持创新互联。
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