Android recycleview+cardview

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第一步：导入依赖：recycleview和cardview

compile 'com.android.support:recyclerview-v7:24.2.1'compile 'com.android.support:cardview-v7:24.2.1'compile 'com.android.support:appcompat-v7:24.2.1'

第二部：xml中recycleview和cardview（item）

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

cardview：

<?xml version="1.0" encoding="utf-8"?><android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    app:cardBackgroundColor="#ffffff"    android:layout_width="match_parent"    android:layout_height="match_parent">    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="match_parent"><TextView    android:textColor="#9b9b9b"    android:textSize="15.0sp"android:layout_centerVertical="true"    android:layout_alignParentLeft="true"    android:layout_marginLeft="20dp"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="Cisco"    android:id="@+id/text"/>    <ImageView        android:id="@+id/wifiLeve"        android:layout_centerVertical="true"        android:layout_alignParentRight="true"        android:layout_marginRight="20dp"        android:layout_width="22dp"        android:layout_height="15dp"android:background="@drawable/one"        />    </RelativeLayout></android.support.v7.widget.CardView>

第三部：cardview的属性

android:cardCornerRadius在xml文件中设置card圆角的大小CardView.setRadius在代码中设置card圆角的大小android:cardBackgroundColor在xml文件中设置card背景颜色android:elevation在xml文件中设置阴影的大小card_view:cardElevation在xml文件中设置阴影的大小card_view:cardMaxElevation在xml文件中设置阴影最大高度card_view:cardCornerRadius在xml文件中设置卡片的圆角大小card_view:contentPadding在xml文件中设置卡片内容于边距的间隔 card_view:contentPaddingBottom在xml文件中设置卡片内容于下边距的间隔 card_view:contentPaddingTop在xml文件中设置卡片内容于上边距的间隔  card_view:contentPaddingLeft在xml文件中设置卡片内容于左边距的间隔  card_view:contentPaddingRight在xml文件中设置卡片内容于右边距的间隔  card_view:contentPaddingStart在xml文件中设置卡片内容于边距的间隔起始  card_view:contentPaddingEnd在xml文件中设置卡片内容于边距的间隔终止 card_view:cardUseCompatPadding在xml文件中设置内边距，V21+的版本和之前的版本仍旧具有一样的计算方式card_view:cardPreventConrerOverlap 在xml文件中设置内边距，在V20和之前的版本中添加内边距，这个属性为了防止内容和边角的重叠

第四部分：recycleview adapter

package com.jdhr.crowdfunds.activitygovern;import android.content.Context;import android.support.v7.widget.RecyclerView;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.view.WindowManager;import android.widget.TextView;import com.jdhr.crowdfunds.R;import java.util.List;/** * Created by Administrator on 2017/4/13. */public class RecycleviewAdapter extends RecyclerView.Adapter<RecycleviewAdapter.MyViewholder>implements View.OnClickListener{    List<String> mList;    Context mContext;    //定义一个点击事件的接口    public static  interface onRecycleviewItemClickListener {        void onItemClick(View view , String data);    }    private onRecycleviewItemClickListener mOnItemClickListener = null;    public void setOnItemClickListener(onRecycleviewItemClickListener listener) {        this.mOnItemClickListener = listener;    }    public RecycleviewAdapter(List<String> allWifi, Context mContext) {        this.mList = allWifi;        this.mContext = mContext;    }    //item的点击事件    @Override    public void onClick(View view) {        if (mOnItemClickListener != null) {            //注意这里使用getTag方法获取数据            mOnItemClickListener.onItemClick(view,(String) view.getTag());        }    }    class MyViewholder extends  RecyclerView.ViewHolder{        TextView actionName;        public MyViewholder(View itemView) {            super(itemView);            actionName= (TextView) itemView.findViewById(R.id.text);        }    }    @Override    public RecycleviewAdapter.MyViewholder onCreateViewHolder(ViewGroup parent, int viewType) {        View view= LayoutInflater.from(mContext).inflate(R.layout.item_recycleview,null);        ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);        WindowManager wm = (WindowManager)mContext                .getSystemService(Context.WINDOW_SERVICE);        int width = wm.getDefaultDisplay().getWidth();        int height = wm.getDefaultDisplay().getHeight();        lp.width=width/2;             view.setLayoutParams(lp);        //为item设置点击事件        view.setOnClickListener(this);        MyViewholder viewholder=new MyViewholder(view);        return viewholder;    }    @Override    public void onBindViewHolder(MyViewholder holder, int position) {        View view=holder.itemView;        if(view==null){            Log.e("获取到的view为空","------");        }else {            Log.e("获取到的不view为空","------");        }        ViewGroup.LayoutParams myLayoutParams=holder.itemView.getLayoutParams();        if(myLayoutParams==null){            Log.e("layoutparams为空","layoutparams为空");        }else {            Log.e("layoutparams不为空","layoutparams为空");        }        //将数据保存在itemview的tag中        holder.itemView.setTag(mList.get(position));        holder.actionName.setText(mList.get(position));    }    @Override    public int getItemCount() {        return mList.size();    }}


第五部分：recycleview的item间距
public class RecycleviewItem extends RecyclerView.ItemDecoration{private int space;    public RecycleviewItem(int space) {        this.space = space;    }    @Override    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {        outRect.left = space;        outRect.right = space;        outRect.bottom = space;        if(parent.getChildPosition(view) != 0){            outRect.top = space;    }}}


调用： myRecycleview= (RecyclerView) findViewById(R.id.recycleView);        WifiManager mWifiManager= (WifiManager) getSystemService(Context.WIFI_SERVICE);        allWifi= mWifiManager.getScanResults();
        myRecycleview.setLayoutManager(new LinearLayoutManager(this));        myRecycleview.addItemDecoration(new RecycleviewItem(5));        RecycleviewAdapter adapter=new RecycleviewAdapter(allWifi,getApplicationContext());        myRecycleview.setAdapter(adapter);        adapter.setOnItemClickListener(new RecycleviewAdapter.onRecycleviewItemClickListener() {            @Override            public void onItemClick(View view, ScanResult data) {                Toast.makeText(getApplicationContext(),data.SSID,Toast.LENGTH_LONG).show();            }        });
//默认纵向，这样设置横向//LinearLayoutManager linearLayoutManager=new LinearLayoutManager(this);//linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);


附加：cardview的操作
<android.support.v7.widget.CardView        app:cardBackgroundColor="@color/appleGreen"        app:cardCornerRadius="10dp"        app:cardMaxElevation="10dp"        app:cardElevation="5dp"        app:cardPreventCornerOverlap="true"        app:cardUseCompatPadding="true">     </android.support.v7.widget.CardView>1
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cardBackgroundColor属性指定CardView的背景色； 
cardCornerRadius属性指定作为边框的圆角矩形的半径； 
cardElevation是阴影大小，MAX～～是最大阴影大小； 
cardUseCompatPadding compat一般是为了兼容设备，保持一样的外观，所以这里就是保持内边距的计算方式一样； 
cardPreventCornerOverlap属性是为了防止卡片内容和边角的重叠；

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