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在Android TV上一般選中某個View, 都會有焦點突出放大的效果, 但是當在RecyclerView中(ListView或GridView)實現當item View執行放大動畫后會被其他的item View遮擋.
原因是: RecyclerView的機制是越靠后的View z-order越高, 所以bringToFront方法是不管用的.
在實現針對TV端的自定義控件 TvRecyclerView 時遇到此問題, 最后的解決方案是:
自定義RecyclerView, 重寫getChildDrawingOrder方法, 讓選中的item最后繪制, 這樣就不會讓其他view遮擋.
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() {
//啟用子視圖排序功能
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;
}
}
最好還需要設置RecyclerView的父類的屬性: clipChildren = false, clipToPadding = false, 避免邊緣的子view被父類遮擋.
<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>
使用介紹:
(1) 自定具有放大縮小的布局:
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) 放大動畫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) 子視圖的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;
}
}
}
效果圖如下:
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