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.

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.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:clipChildren="false" android:clipToPadding="false"> <android.support.v7.widget.RecyclerView android:layout_width="match_parent" android:layout_height="245dp" android:layout_centerInParent="true" /></RelativeLayout>

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"?><set xmlns:android="http://schemas.android.com/apk/res/android" android:fillAfter="true" android:shareInterpolator="false"> <scale android:duration="150" android:fromXScale="1.0" android:fromYScale="1.0" android:interpolator="@android:anim/accelerate_decelerate_interpolator" android:pivotX="50.0%" android:pivotY="50.0%" android:repeatCount="0" android:toXScale="1.08" android:toYScale="1.08" /></set>

(3) 主布局xml:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:clipChildren="false" android:clipToPadding="false"> <com.app.tvviewpager.ScaleRecyclerView android:id="@+id/main_recyclerView" android:layout_width="match_parent" android:layout_height="210dp" android:layout_centerInParent="true"/></RelativeLayout>

(4) 子视图的xml:

<FocusRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/rl_main_layout" android:layout_width="300dp" android:layout_height="210dp" android:focusable="true"> <TextView android:layout_width="300dp" android:layout_height="30dp" android:layout_alignParentBottom="true" /></FocusRelativeLayout>

(5) adapter配置:

public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> { 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。