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April 24, 2018 05:08
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public class LinearItemDividerDecoration extends RecyclerView.ItemDecoration { | |
private Drawable mDivider; | |
private boolean mShowFirstDivider = false; | |
private boolean mShowLastDivider = false; | |
public LinearItemDividerDecoration(Context context, AttributeSet attrs) { | |
final TypedArray a = context | |
.obtainStyledAttributes(attrs, new int[]{android.R.attr.listDivider}); | |
mDivider = a.getDrawable(0); | |
a.recycle(); | |
} | |
public LinearItemDividerDecoration(Context context, AttributeSet attrs, boolean showFirstDivider, | |
boolean showLastDivider) { | |
this(context, attrs); | |
mShowFirstDivider = showFirstDivider; | |
mShowLastDivider = showLastDivider; | |
} | |
public LinearItemDividerDecoration(Drawable divider) { | |
mDivider = divider; | |
} | |
public LinearItemDividerDecoration(Drawable divider, boolean showFirstDivider, | |
boolean showLastDivider) { | |
this(divider); | |
mShowFirstDivider = showFirstDivider; | |
mShowLastDivider = showLastDivider; | |
} | |
@Override | |
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, | |
RecyclerView.State state) { | |
super.getItemOffsets(outRect, view, parent, state); | |
if (mDivider == null) { | |
return; | |
} | |
if (parent.getChildPosition(view) < 1) { | |
return; | |
} | |
if (getOrientation(parent) == LinearLayoutManager.VERTICAL) { | |
outRect.top = mDivider.getIntrinsicHeight(); | |
} else { | |
outRect.left = mDivider.getIntrinsicWidth(); | |
} | |
} | |
@Override | |
public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) { | |
if (mDivider == null) { | |
super.onDrawOver(c, parent, state); | |
return; | |
} | |
// Initialization needed to avoid compiler warning | |
int left = 0, right = 0, top = 0, bottom = 0, size; | |
int orientation = getOrientation(parent); | |
int childCount = parent.getChildCount(); | |
if (orientation == LinearLayoutManager.VERTICAL) { | |
size = mDivider.getIntrinsicHeight(); | |
left = parent.getPaddingLeft(); | |
right = parent.getWidth() - parent.getPaddingRight(); | |
} else { //horizontal | |
size = mDivider.getIntrinsicWidth(); | |
top = parent.getPaddingTop(); | |
bottom = parent.getHeight() - parent.getPaddingBottom(); | |
} | |
for (int i = mShowFirstDivider ? 0 : 1; i < childCount; i++) { | |
View child = parent.getChildAt(i); | |
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams(); | |
if (orientation == LinearLayoutManager.VERTICAL) { | |
top = child.getTop() - params.topMargin; | |
bottom = top + size; | |
} else { //horizontal | |
left = child.getLeft() - params.leftMargin; | |
right = left + size; | |
} | |
mDivider.setBounds(left, top, right, bottom); | |
mDivider.draw(c); | |
} | |
// show last divider | |
if (mShowLastDivider && childCount > 0) { | |
View child = parent.getChildAt(childCount - 1); | |
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams(); | |
if (orientation == LinearLayoutManager.VERTICAL) { | |
top = child.getBottom() + params.bottomMargin; | |
bottom = top + size; | |
} else { // horizontal | |
left = child.getRight() + params.rightMargin; | |
right = left + size; | |
} | |
mDivider.setBounds(left, top, right, bottom); | |
mDivider.draw(c); | |
} | |
} | |
private int getOrientation(RecyclerView parent) { | |
if (parent.getLayoutManager() instanceof LinearLayoutManager) { | |
LinearLayoutManager layoutManager = (LinearLayoutManager) parent.getLayoutManager(); | |
return layoutManager.getOrientation(); | |
} else { | |
throw new IllegalStateException( | |
"DividerItemDecoration can only be used with a LinearLayoutManager."); | |
} | |
} | |
} |
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