wearable/wear/WearMessagingApp/Wearable/src/main/java/com/example/android/wearable/wear/messaging/util/DividerItemDecoration.java

/*
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.android.wearable.wear.messaging.util;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.support.v4.content.ContextCompat;
import android.support.v7.widget.RecyclerView;
import android.view.View;

/** Recycler view divider. */
public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private Drawable mDrawable;

    public DividerItemDecoration(Context context, int resId) {
        mDrawable = ContextCompat.getDrawable(context, resId);
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        int left = parent.getLeft();
        int right = parent.getRight();

        int childCount = parent.getChildCount();

        for (int i = 0; i < childCount; i++) {
            View child = parent.getChildAt(i);

            int top = child.getBottom();
            int bottom = top + mDrawable.getIntrinsicHeight();

            mDrawable.setBounds(left, top, right, bottom);
            mDrawable.draw(c);
        }
    }
}