Created
June 27, 2017 06:24
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GridDividerDecoration
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package com.example.android.recyclerplayground; | |
import android.content.Context; | |
import android.graphics.Canvas; | |
import android.graphics.Rect; | |
import android.graphics.drawable.Drawable; | |
import android.support.v7.widget.RecyclerView; | |
import android.view.View; | |
/** | |
* ItemDecoration implementation that applies and inset margin | |
* around each child of the RecyclerView. It also draws item dividers | |
* that are expected from a vertical list implementation, such as | |
* ListView. | |
*/ | |
public class GridDividerDecoration extends RecyclerView.ItemDecoration { | |
private static final int[] ATTRS = { android.R.attr.listDivider }; | |
private Drawable mDivider; | |
private int mInsets; | |
public GridDividerDecoration(Context context) { | |
// TypedArray a = context.obtainStyledAttributes(ATTRS); | |
// mDivider = a.getDrawable(0); | |
// a.recycle(); | |
mDivider = context.getDrawable(R.drawable.divider); | |
// mInsets = context.getResources().getDimensionPixelSize(R.dimen.card_insets); | |
} | |
@Override | |
public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) { | |
drawVertical(c, parent); | |
drawHorizontal(c, parent); | |
} | |
/** Draw dividers at each expected grid interval */ | |
public void drawVertical(Canvas c, RecyclerView parent) { | |
if (parent.getChildCount() == 0) return; | |
final int childCount = parent.getChildCount(); | |
for (int i = 0; i < childCount; i++) { | |
final View child = parent.getChildAt(i); | |
final RecyclerView.LayoutParams params = | |
(RecyclerView.LayoutParams) child.getLayoutParams(); | |
final int left = child.getLeft() - params.leftMargin - mInsets; | |
final int right = child.getRight() + params.rightMargin + mInsets; | |
final int top = child.getBottom() + params.bottomMargin + mInsets; | |
final int bottom = top + mDivider.getIntrinsicHeight(); | |
mDivider.setBounds(left, top, right, bottom); | |
mDivider.draw(c); | |
} | |
} | |
/** Draw dividers to the right of each child view */ | |
public void drawHorizontal(Canvas c, RecyclerView parent) { | |
final int childCount = parent.getChildCount(); | |
for (int i = 0; i < childCount; i++) { | |
final View child = parent.getChildAt(i); | |
final RecyclerView.LayoutParams params = | |
(RecyclerView.LayoutParams) child.getLayoutParams(); | |
final int left = child.getRight() + params.rightMargin + mInsets; | |
final int right = left + mDivider.getIntrinsicWidth(); | |
final int top = child.getTop() - params.topMargin - mInsets; | |
final int bottom = child.getBottom() + params.bottomMargin + mInsets; | |
mDivider.setBounds(left, top, right, bottom); | |
mDivider.draw(c); | |
} | |
} | |
@Override | |
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { | |
//We can supply forced insets for each item view here in the Rect | |
outRect.set(mInsets, mInsets, mInsets, mInsets); | |
} | |
} |
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