RecyclerView 聊天界面 输入框

package com.mxdnp.widget;

import android.os.Handler;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;

/**
 * RecyclerView在下面的键盘弹起来后将RecyclerView的内容滑动到最下面，避免键盘遮挡住RecyclerView最下面的内容
 * 如果没有输入框就没有必要使用这个
 * Created by xushihai on 2018/5/7.
 */

public class RVKeyBoardBridge implements View.OnLayoutChangeListener {
    @Override
    public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
        if (!(v instanceof RecyclerView))
            return;
        final RecyclerView recyclerView = (RecyclerView) v;
        final RecyclerView.Adapter adapter = ((RecyclerView) v).getAdapter();
        if (adapter == null || adapter.getItemCount() == 0
                || recyclerView.getLayoutManager() == null
                || !(recyclerView.getLayoutManager() instanceof LinearLayoutManager)
                || ((LinearLayoutManager) recyclerView.getLayoutManager()).getOrientation() != LinearLayoutManager.VERTICAL)
            return;
        if (bottom < oldBottom && adapter.getItemCount() > 0) {
            new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {
                    recyclerView.stopScroll();
                    int position = ((LinearLayoutManager) recyclerView.getLayoutManager()).getReverseLayout() ? 0 : adapter.getItemCount() - 1;
                    recyclerView.getLayoutManager().scrollToPosition(position);
                }
            }, 0);
            Log.i("RVKeyBoardBridge", "检测到键盘的弹起来了");
        }
    }
}