RecyclerVIew实现悬浮吸顶效果

RecyclerVIew实现悬浮吸顶效果图

这里写图片描述

主页面布局

RecyclerView的子条目布局

activity代码

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();
  }

  
  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()));
  }

  
  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 getData() {
    List 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;
  }
}

adapter代码

public class StickyExampleAdapter extends RecyclerView.Adapter {
  //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 datas;

  StickyExampleAdapter(Context context, List 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);
    }
  }
}

StickyBean代码

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文件

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'
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。