<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:layout_width="match_parent"              android:layout_height="@dimen/nav_header_height"              android:background="@drawable/side_nav_bar"              android:gravity="bottom"              android:orientation="vertical"              android:paddingBottom="@dimen/activity_vertical_margin"              android:paddingLeft="@dimen/activity_horizontal_margin"              android:paddingRight="@dimen/activity_horizontal_margin"              android:paddingTop="@dimen/activity_vertical_margin"              android:theme="@style/ThemeOverlay.AppCompat.Dark">    <de.hdodenhof.circleimageview.CircleImageView        xmlns:app="http://schemas.android.com/apk/res-auto"        android:id="@+id/profile_image"        android:layout_width="96dp"        android:layout_height="96dp"        android:src="http://www.mamicode.com/@drawable/darth_vader"        app:civ_border_width="2dp"        /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    app:layout_behavior="@string/appbar_scrolling_view_behavior"    tools:context="com.example.xw.design2.MainActivity"    tools:showIn="@layout/app_bar_main">  <android.support.v7.widget.RecyclerView      android:id="@+id/rv"      android:layout_width="match_parent"      android:layout_height="match_parent"></android.support.v7.widget.RecyclerView></RelativeLayout>

<?xml version="1.0" encoding="utf-8"?><android.support.v7.widget.CardView    android:layout_height="wrap_content"    android:layout_width="match_parent"    xmlns:card_view="http://schemas.android.com/apk/res-auto"    card_view:contentPadding="10dp"    card_view:cardBackgroundColor="#303069"    card_view:cardCornerRadius="10dp"    card_view:cardPreventCornerOverlap="true"    card_view:cardUseCompatPadding="true"    xmlns:android="http://schemas.android.com/apk/res/android"><TextView    android:id="@+id/tv"    android:textColor="#fff"    android:layout_width="wrap_content"    android:layout_height="wrap_content"/></android.support.v7.widget.CardView>

 private RecyclerView mRecyclerView;    private String[] data=http://www.mamicode.com/{"2014 年，随着 Google 推出了全新的设计语言 Material Design，还迎来了新的 Android 支持库 v7，其中就包含了 Material Design 设计语言中关于 Card 卡片概念的实现 —— CardView。"    ,"经历了相当长的一段时间相信许多 Android 开发者都已经应用了这个控件，现在才写这篇文章可能有点晚，但对于刚刚开始使用的开发者以及其他已经使用了一段时间但做出来效果不好的同学应该能帮上点小忙。"    ,"Google 在 Android Lollipop 中引入了 Material Design 设计中的阴影（Elevation）和 Z 轴位移，其目的就是突出界面中不同元素之间的层次关系"    ,"明年夏天，自由球员布雷克-格里芬可能重返俄克拉何马城与拉塞尔-威斯布鲁克联手。如果实现，雷霆队能真正意义上地威胁勇士队吗？"};

 class MyHolder extends RecyclerView.ViewHolder{        private TextView mTextView;        public MyHolder(View itemView) {            super(itemView);            mTextView= (TextView) itemView.findViewById(R.id.tv);        }    }

 class MyAdapter extends  RecyclerView.Adapter<MyHolder>{        @Override        public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {            LayoutInflater layoutInflater=LayoutInflater.from(getApplicationContext());            View v=layoutInflater.inflate(R.layout.item,parent,false);            MyHolder holder=new MyHolder(v);            return holder;        }        @Override        public void onBindViewHolder(MyHolder holder, int position) {                holder.mTextView.setText(data[position]);        }        @Override        public int getItemCount() {            return data.length;        }    }

 mRecyclerView= (RecyclerView) findViewById(R.id.rv);        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));        mRecyclerView.setAdapter(new MyAdapter());