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package de.luhmer.owncloudnewsreader.adapter;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.view.View;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
public class DividerItemDecoration extends RecyclerView.ItemDecoration {
private Drawable mDivider;
private int size = 0;
public DividerItemDecoration(Context context) {
final TypedArray a = context.obtainStyledAttributes(new int[]{android.R.attr.listDivider});
mDivider = a.getDrawable(0);
a.recycle();
if(mDivider != null)
this.size = mDivider.getIntrinsicHeight();
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
RecyclerView.State state) {
super.getItemOffsets(outRect, view, parent, state);
if (mDivider == null || parent.getChildLayoutPosition(view) < 1) {
return;
}
outRect.top = size;
}
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
if(mDivider == null)
return;
if (!(parent.getLayoutManager() instanceof LinearLayoutManager) ||
((LinearLayoutManager)parent.getLayoutManager()).getOrientation() != RecyclerView.VERTICAL) {
throw new IllegalStateException(
"DividerItemDecoration can only be used with a vertical LinearLayoutManager.");
}
Rect dividerRect = new Rect(0,0,0,0);
int childCount = parent.getChildCount();
dividerRect.left = parent.getPaddingLeft();
dividerRect.right = parent.getWidth() - parent.getPaddingRight();
for (int i = 0; i < childCount; i++) {
View child = parent.getChildAt(i);
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
dividerRect.top = child.getTop() - params.topMargin;
dividerRect.bottom = dividerRect.top + size;
if(i > 0) {
mDivider.setBounds(dividerRect);
mDivider.draw(c);
}
}
}
}
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