<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.v7.widget.RecyclerView android:id="@+id/recycle" android:layout_width="match_parent" android:layout_height="match_parent" /> <TextView android:id="@+id/tv_sticky_header_view" android:layout_width="match_parent" android:layout_height="50dp" android:background="#EFFAE7" android:gravity="center" android:text="吸顶文本1" /> <!--<include layout="@layout/layout_sticky_header_view"/>--></FrameLayout>

<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <RelativeLayout android:layout_marginLeft="5dp" android:layout_marginRight="5dp" android:id="@+id/rl_content_wrapper" android:layout_width="match_parent" android:layout_height="30dp"> <TextView android:id="@+id/name" android:layout_centerVertical="true" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:id="@+id/auto" android:layout_centerVertical="true" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" /> <View android:layout_width="match_parent" android:layout_height="1dp" android:layout_alignParentBottom="true" android:background="#ffffff"/> </RelativeLayout> <TextView android:id="@+id/tv_sticky_header_view" android:layout_width="match_parent" android:layout_height="50dp" android:background="#EFFAE7" android:gravity="center" android:text="吸顶文本1" /></FrameLayout>

public class MainActivity extends AppCompatActivity {
private TextView tvStickyHeaderView;
private RecyclerView recyclerView;
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initListener();
}
/** * 初始化View */ private void initView() {
recyclerView = (RecyclerView) findViewById(R.id.recycle);
tvStickyHeaderView = (TextView) findViewById(R.id.tv_sticky_header_view);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(new StickyExampleAdapter(this, getData()));
}
/** * 初始化Listener */ private void initListener() {
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
View stickview = recyclerView.findChildViewUnder(0, 0);
if (stickview != null && stickview.getContentDescription() != null) {
if (!TextUtils.equals(tvStickyHeaderView.getText(), stickview.getContentDescription())) {
tvStickyHeaderView.setText(stickview.getContentDescription());
}
}
View transInfoView = recyclerView.findChildViewUnder( 0, tvStickyHeaderView.getHeight() + 1);
if (transInfoView.getTag() != null) {
int transViewStatus = (int) transInfoView.getTag();
int top = transInfoView.getTop();
if (transViewStatus == StickyExampleAdapter.HAS_STICKY_VIEW) {
if (top > 0) {
int dealtY = top - tvStickyHeaderView.getMeasuredHeight();
tvStickyHeaderView.setTranslationY(dealtY);
}
else {
tvStickyHeaderView.setTranslationY(0);
}
}
else if (transViewStatus == StickyExampleAdapter.NONE_STICKY_VIEW) {
tvStickyHeaderView.setTranslationY(0);
}
}
}
}
);
}
public List<StickyBean> getData() {
List<StickyBean> stickyExampleModels = new ArrayList<>();
for (int index = 0;
index < 100;
index++) {
if (index < 15) {
stickyExampleModels.add(new StickyBean( "吸顶文本1", "name" + index, "gender" + index));
}
else if (index < 25) {
stickyExampleModels.add(new StickyBean( "吸顶文本2", "name" + index, "gender" + index));
}
else if (index < 35) {
stickyExampleModels.add(new StickyBean( "吸顶文本3", "name" + index, "gender" + index));
}
else {
stickyExampleModels.add(new StickyBean( "吸顶文本4", "name" + index, "gender" + index));
}
}
return stickyExampleModels;
}
}

public class StickyExampleAdapter extends RecyclerView.Adapter<StickyExampleAdapter.RecyclerViewHolder> {
//第一个吸顶 private static final int FIRST_STICKY_VIEW = 1;
//别的吸顶 static final int HAS_STICKY_VIEW = 2;
//正常View static final int NONE_STICKY_VIEW = 3;
private final LayoutInflater mInflate;
private final List<StickyBean> datas;
StickyExampleAdapter(Context context, List<StickyBean> datas){
mInflate = LayoutInflater.from(context);
this.datas = datas;
}
@Override public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View inflate = mInflate.inflate(R.layout.item_ui, parent, false);
return new RecyclerViewHolder(inflate);
}
@Override public void onBindViewHolder(RecyclerViewHolder holder, int position) {
StickyBean stickyBean = datas.get(position);
holder.tvName.setText(stickyBean.name);
holder.tvGender.setText(stickyBean.autor);
if (position == 0) {
holder.tvStickyHeader.setVisibility(View.VISIBLE);
holder.tvStickyHeader.setText(stickyBean.sticky);
holder.itemView.setTag(FIRST_STICKY_VIEW);
}
else {
if (!TextUtils.equals(stickyBean.sticky, datas.get(position - 1).sticky)) {
holder.tvStickyHeader.setVisibility(View.VISIBLE);
holder.tvStickyHeader.setText(stickyBean.sticky);
holder.itemView.setTag(HAS_STICKY_VIEW);
}
else {
holder.tvStickyHeader.setVisibility(View.GONE);
holder.itemView.setTag(NONE_STICKY_VIEW);
}
}
//通过此处设置ContentDescription，作为内容描述，可以通过getContentDescription取出，功效跟setTag差不多。 holder.itemView.setContentDescription(stickyBean.sticky);
}
@Override public int getItemCount() {
return datas == null ? 0 : datas.size();
}
public class RecyclerViewHolder extends RecyclerView.ViewHolder{
TextView tvStickyHeader;
RelativeLayout rlContentWrapper;
TextView tvName;
TextView tvGender;
RecyclerViewHolder(View itemView) {
super(itemView);
tvStickyHeader = (TextView) itemView.findViewById(R.id.tv_sticky_header_view);
rlContentWrapper = (RelativeLayout) itemView.findViewById(R.id.rl_content_wrapper);
tvName = (TextView) itemView.findViewById(R.id.name);
tvGender = (TextView) itemView.findViewById(R.id.auto);
}
}
}

public class StickyBean {
public String name;
public String autor;
public String sticky;
public StickyBean(String sticky, String name, String autor) {
this.sticky = sticky;
this.name = name;
this.autor = autor;
}
}

apply plugin: 'com.android.application'android {
compileSdkVersion 26 buildToolsVersion "25.0.3" defaultConfig {
applicationId "com.lg.floating" minSdkVersion 15 targetSdkVersion 26 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" }
buildTypes {
release {
minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' }
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar']) androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations' }
) compile 'com.android.support:appcompat-v7:26.0.0-alpha1' compile 'com.android.support:recyclerview-v7:23.1.0' testCompile 'junit:junit:4.12'}