Android中RecyclerView设置边框并循环滚动

1，Demo展示图片:

2，布局代码如下:

//（layout）activity_main.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
-----------------------------------------------------------

//（layout）recyclerview_item.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:background="@drawable/item_shape"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<TextView
android:id="@+id/tv_letter"
android:paddingTop="15dp"
android:paddingBottom="15dp"
android:text="A"
android:textSize="30sp"
android:textColor="#fff"
android:layout_centerInParent="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</RelativeLayout>
--------------------------------------------------------------

//（drawable）item_shape.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="10px"/>
<solid android:color="@color/colorBlue"/>
<stroke android:width="2px" android:color="#fff"/>
</shape>
<!--设置了圆角弧度 每个item的边框粗细及边框颜色和背景颜色-->

3，Activity代码如下:

//（activity）MainActivity
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;

public class MainActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private static final String TAG = "MainActivity";
private static final int RECYCLERVIEWRollROLL = 1;
private Handler mRecyclerViewHandler;
private AtomicBoolean shouldContinue = new AtomicBoolean(false);
private Thread thread = null;
private List<String> mData;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//强制设置为横屏
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
initView();
initData();
}

private void initView(){
mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
//三列
mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));
}

private void initData(){
MyRollRecyclerViewAdapter mMyRollRecyclerViewAdapter = new MyRollRecyclerViewAdapter();
mRecyclerView.setAdapter(mMyRollRecyclerViewAdapter);
mData = new ArrayList<>();
for (int i = 'A'; i <= 'Z'; i++){
mData.add("" + (char) i);
}
}

class MyRollRecyclerViewAdapter extends RecyclerView.Adapter<MyRollRecyclerViewAdapter.MyRollRecyclerViewHolder> {

@Override
public MyRollRecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
MyRollRecyclerViewHolder holder = new MyRollRecyclerViewHolder(LayoutInflater.from(
MainActivity.this).inflate(R.layout.recyclerview_item, parent, false));
return holder;
}

@Override
public void onBindViewHolder(MyRollRecyclerViewHolder holder, int position) {

holder.mTv_letter.setText(mData.get(position));
}

@Override
public int getItemCount() {
if (mData != null) {
return mData.size();
}
return 0;
}

class MyRollRecyclerViewHolder extends RecyclerView.ViewHolder {

TextView mTv_letter;

public MyRollRecyclerViewHolder(View view) {
super(view);
mTv_letter = (TextView) view.findViewById(R.id.tv_letter);
}
}
}

/**RecyclerView条目的滚动操作*/
private void initScroll() {
/**主线程的handler，用于执行Marquee的滚动消息*/
mRecyclerViewHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case RECYCLERVIEWRollROLL:
/**垂直移动偏移2个像素*/
mRecyclerView.scrollBy(0, 2);
/**如果移动到底部*/
if (isSlideToBottom(mRecyclerView)) {
Log.i(TAG, "滑动到了底部");
/**跳至顶部*/
mRecyclerView.scrollToPosition(0);
/**如果没有移动到底部*/
} else {
Log.i(TAG, "没有滑动到底部");
}
break;
}
}
};

if (thread == null) {
thread = new Thread() {
public void run() {
while (shouldContinue.get()) {
/**每次滚动睡眠0.2秒*/
SystemClock.sleep(200);
mRecyclerViewHandler.sendEmptyMessage(RECYCLERVIEWRollROLL);
}
/**退出循环时清理handler*/
mRecyclerViewHandler = null;
}
};
}
}

@Override
/**在附到窗口的时候开始滚动*/
public void onAttachedToWindow() {
super.onAttachedToWindow();
shouldContinue.set(true);
initScroll();
thread.start();
}

/**判断Recycler是否滑动至最底部  是返回true  不是返回false*/
public static boolean isSlideToBottom(RecyclerView recyclerView) {
if (recyclerView == null) return false;
if (recyclerView.computeVerticalScrollExtent() + recyclerView.computeVerticalScrollOffset()
>= recyclerView.computeVerticalScrollRange())
return true;
return false;
}

@Override
/**在脱离窗口时处理相关内容*/
public void onDetachedFromWindow() {
super.onDetachedFromWindow();
stopMarquee();
}

/**停止滚动*/
public void stopMarquee() {
shouldContinue.set(false);
thread = null;
}
}