效果圖

主頁面佈局

<?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
 
="吸頂文字1" />

    <!--<include layout="@layout/layout_sticky_header_view"/>-->
</FrameLayout>

RecyclerView的子條目佈局

<?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="吸頂文字1" />

</FrameLayout>

activity程式碼

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(
                        "吸頂文字1", "name" + index, "gender" + index));
            } else if (index < 25) {
                stickyExampleModels.add(new StickyBean(
                        "吸頂文字2", "name" + index, "gender" + index));
            } else if (index < 35) {
                stickyExampleModels.add(new StickyBean(
                        "吸頂文字3", "name" + index, "gender" + index));
            } else {
                stickyExampleModels.add(new StickyBean(
                        "吸頂文字4", "name" + index, "gender" + index));
            }
        }
        return stickyExampleModels;
    }
}

adapter程式碼

public class StickyExampleAdapter extends RecyclerView.Adapter<StickyExampleAdapter.RecyclerViewHolder> {
    //第一個吸頂
    private static final int FIRST_STICKY_VIEW = 1;
    //別的吸頂
    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);
            }
        }
        //通過此處設定ContentDescription，作為內容描述，可以通過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);
        }
    }
}

StickyBean程式碼

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;
    }
}

app的build檔案

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'
}