自定义 ItemDecoration class 未在最后一项上绘制分隔线
Custom ItemDecoration class is not drawing divider on last item
我有一个自定义的 ItemDecoration class,它没有为我的最后一个项目绘制最后一个分隔线。
自定义装饰class:
public class DividerTest extends RecyclerView.ItemDecoration {
private Drawable mDivider;
public DividerTest(Context context) {
mDivider = context.getResources().getDrawable(R.drawable.divider_horizontal);
}
@Override
public void onDraw(@NonNull Canvas c, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
int left = parent.getPaddingLeft();
int right = parent.getWidth() - parent.getPaddingRight();
int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
View child = parent.getChildAt(i);
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
int top = child.getBottom() + params.bottomMargin;
int bottom = top + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
}
用法:
RecyclerAdapter adapter = new RecyclerAdapter(list, this);
mRecycler.setLayoutManager(new LinearLayoutManager(this));
DividerTest divider = new DividerTest(this);
mRecycler.addItemDecoration(divider);
mRecycler.setAdapter(adapter);
当我使用默认的 DividerItemDecoration class 时,它有效:
RecyclerAdapter adapter = new RecyclerAdapter(list, this);
mRecycler.setLayoutManager(new LinearLayoutManager(this));
DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL);
mRecycler.addItemDecoration(dividerItemDecoration);
mRecycler.setAdapter(adapter);
为什么我的自定义物品装饰 class 没有绘制我的最后一个分隔线?
这对我有用,在你的 ItemDecoration class
上将实现添加到 getItemOffsets
@Override
public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, RecyclerView parent, @NonNull RecyclerView.State state) {
int position = parent.getChildAdapterPosition(view);
if (parent.getAdapter() != null && position == parent.getAdapter().getItemCount()-1) {
outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
} else {
super.getItemOffsets(outRect, view, parent, state);
}
}
我有一个自定义的 ItemDecoration class,它没有为我的最后一个项目绘制最后一个分隔线。
自定义装饰class:
public class DividerTest extends RecyclerView.ItemDecoration {
private Drawable mDivider;
public DividerTest(Context context) {
mDivider = context.getResources().getDrawable(R.drawable.divider_horizontal);
}
@Override
public void onDraw(@NonNull Canvas c, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
int left = parent.getPaddingLeft();
int right = parent.getWidth() - parent.getPaddingRight();
int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
View child = parent.getChildAt(i);
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
int top = child.getBottom() + params.bottomMargin;
int bottom = top + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
}
用法:
RecyclerAdapter adapter = new RecyclerAdapter(list, this);
mRecycler.setLayoutManager(new LinearLayoutManager(this));
DividerTest divider = new DividerTest(this);
mRecycler.addItemDecoration(divider);
mRecycler.setAdapter(adapter);
当我使用默认的 DividerItemDecoration class 时,它有效:
RecyclerAdapter adapter = new RecyclerAdapter(list, this);
mRecycler.setLayoutManager(new LinearLayoutManager(this));
DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL);
mRecycler.addItemDecoration(dividerItemDecoration);
mRecycler.setAdapter(adapter);
为什么我的自定义物品装饰 class 没有绘制我的最后一个分隔线?
这对我有用,在你的 ItemDecoration class
上将实现添加到getItemOffsets
@Override
public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, RecyclerView parent, @NonNull RecyclerView.State state) {
int position = parent.getChildAdapterPosition(view);
if (parent.getAdapter() != null && position == parent.getAdapter().getItemCount()-1) {
outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
} else {
super.getItemOffsets(outRect, view, parent, state);
}
}