嵌套RecyclerView左右滑動替代自定義view

以前的左右滑動效果採用自定義scrollview或者linearlayout來實現，recyclerview可以很好的做這個功能，一般的需求就是要麼一個獨立的左右滑動效果，要麼在一個列表裡的中間部分一個左右滑動效果

而列表裡面也容易，只是需要解決一點小問題，個人認為值得一提的就是高度問題，一般的人採用固定死的高度，可是在列表裡面展示和機型的不同，固定死的話很難保證美觀，動態的高度才能解決問題的所在

首先在一個列表控制項佈局上添加一個recyclerview控制項

<android.support.v7.widget.RecyclerView
        android:id="@+id/plan_recycler"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

然後是adapter適配器佈局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:padding="@dimen/dimen_20dp">

    <ImageView android:id="@+id/img_icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:src="@drawable/bbs_plan_mofa"/>
    <TextView android:id="@+id/tv_content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="@dimen/dimen_8dp"
        android:textSize="15sp"
        android:textColor="@color/color_323232"/>

</LinearLayout>

接下來寫adapter

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.xulu.loanmanager.R;

import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by LiuZhen on 2017/6/22.
 */

public class BBSPlanAdapter extends RecyclerView.Adapter<BBSPlanAdapter.MyViewHolder> {

    private List<String> list;
    private LayoutInflater mInflater;
    private Context context=null;
    private int height;
    private boolean isMeasure = false;
    private CallBack callBack;

    public BBSPlanAdapter(Context context, List<String> list, CallBack callBack) {
        this.context=context;
        this.list = list;
        mInflater = LayoutInflater.from(context);
        this.callBack = callBack;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = mInflater.inflate(R.layout.item_bbsdetail_plan, parent, false);
        if (!isMeasure) {
            view.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
            height = view.getMeasuredHeight();
            callBack.getHeight(height);
        }
        MyViewHolder holder = new MyViewHolder(view);
        return holder;
    }

    public int getHeight(){
        return height;
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, final int position) {
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                callBack.ItemClick(position);
            }
        });
    }

    @Override
    public int getItemCount() {
        return 6;
    }

    static class MyViewHolder extends RecyclerView.ViewHolder{

        @BindView(R.id.tv_content)
        TextView tv_content;

        MyViewHolder(View view){
            super(view);
            ButterKnife.bind(this,view);
        }

    }

    public interface CallBack{
        void getHeight(int height);
        void ItemClick(int position);
    }

}

重點是measure方法，得到測量的高度

接下來就可以直接使用了

private void initScrollList(){
        final RecyclerView planRecycler = (RecyclerView) headView.findViewById(R.id.plan_recycler);

        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(BBSDetailActivity.this);
        linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
        planRecycler.setLayoutManager(linearLayoutManager);
        List<String> list = new ArrayList<>();
        BBSPlanAdapter adapter = new BBSPlanAdapter(BBSDetailActivity.this, list, new BBSPlanAdapter.CallBack() {
            @Override
            public void getHeight(int height) {
                ViewGroup.LayoutParams params = planRecycler.getLayoutParams();
                params.height = height;
                planRecycler.setLayoutParams(params);
            }

            @Override
            public void ItemClick(int position) {
                Toast.makeText(BBSDetailActivity.this,""+position,Toast.LENGTH_SHORT).show();
            }
        });
        planRecycler.setAdapter(adapter);
    }

很簡單，完全替代自定義view，效果如下，如果沒有測量這一步可能會出現高度不適合，要麼是看不到textview的文字，因為太低了，要麼就是太高了，不美觀