RecycleView打造悬浮 吸顶效果
先上效果
导入依赖
implementation 'com.android.support:recyclerview-v7:28.0.0'
implementation 'com.gavin.com.library:stickyDecoration:1.1.0'
这是一个bean 类
public class City {
private String name; //城市名
private String province; //所属省份
private int icon; //所属省份
public City(String name, String province, int icon) {
this.name = name;
this.province = province;
this.icon = icon;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getProvince() {
return province;
}
public void setProvince(String province) {
this.province = province;
}
public int getIcon() {
return icon;
}
public void setIcon(int icon) {
this.icon = icon;
}
}
这是一个方法 用来得到要展示的数据
public class CityUtil {
/**
* 获取城市名
*
* @return
*/
public static List<City> getCityList() {
List<City> dataList = new ArrayList<>();
final String FU_JIAN = "福建省";
final int FU_JIAN_ICON = 1;
dataList.add(new City("福州", FU_JIAN, FU_JIAN_ICON));
dataList.add(new City("厦门", FU_JIAN, FU_JIAN_ICON));
dataList.add(new City("泉州", FU_JIAN, FU_JIAN_ICON));
dataList.add(new City("宁德", FU_JIAN, FU_JIAN_ICON));
dataList.add(new City("漳州", FU_JIAN, FU_JIAN_ICON));
final String AN_HUI = "安徽省";
final int AN_HUI_ICON = 2;
dataList.add(new City("合肥", AN_HUI, AN_HUI_ICON));
dataList.add(new City("芜湖", AN_HUI, AN_HUI_ICON));
dataList.add(new City("蚌埠", AN_HUI, AN_HUI_ICON));
final String ZHE_JIANG = "浙江省";
final int ZHE_JIANG_ICON = 3;
dataList.add(new City("杭州", ZHE_JIANG, ZHE_JIANG_ICON));
dataList.add(new City("宁波", ZHE_JIANG, ZHE_JIANG_ICON));
dataList.add(new City("温州", ZHE_JIANG, ZHE_JIANG_ICON));
dataList.add(new City("嘉兴", ZHE_JIANG, ZHE_JIANG_ICON));
dataList.add(new City("绍兴", ZHE_JIANG, ZHE_JIANG_ICON));
dataList.add(new City("金华", ZHE_JIANG, ZHE_JIANG_ICON));
dataList.add(new City("湖州", ZHE_JIANG, ZHE_JIANG_ICON));
dataList.add(new City("舟山", ZHE_JIANG, ZHE_JIANG_ICON));
final String JIANG_SU = "江苏省";
final int JIANG_SU_ICOM = 4;
dataList.add(new City("南京", JIANG_SU, JIANG_SU_ICOM));
dataList.add(new City("苏州", JIANG_SU, JIANG_SU_ICOM));
dataList.add(new City("徐州", JIANG_SU, JIANG_SU_ICOM));
dataList.add(new City("南通", JIANG_SU, JIANG_SU_ICOM));
dataList.add(new City("无锡", JIANG_SU, JIANG_SU_ICOM));
dataList.add(new City("盐城", JIANG_SU, JIANG_SU_ICOM));
dataList.add(new City("淮安", JIANG_SU, JIANG_SU_ICOM));
dataList.add(new City("泰州", JIANG_SU, JIANG_SU_ICOM));
dataList.add(new City("常州", JIANG_SU, JIANG_SU_ICOM));
dataList.add(new City("连云港", JIANG_SU, JIANG_SU_ICOM));
return dataList;
}
}
这是MainActivity的代码
public class MainActivity extends AppCompatActivity {
RecyclerView.Adapter mAdapter;
List<City> dataList = new ArrayList<>();
private RecyclerView mRecyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
mRecyclerView = (RecyclerView) findViewById(R.id.rv);
//模拟数据
dataList.addAll(CityUtil.getCityList());
dataList.addAll(CityUtil.getCityList());
LinearLayoutManager manager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
mRecyclerView.setLayoutManager(manager);
//使用StickyDecoration
StickyDecoration decoration = StickyDecoration.Builder
.init(new GroupListener() {
@Override
public String getGroupName(int position) {
//组名回调
if (dataList.size() > position) {
//获取城市对应的省份
return dataList.get(position).getProvince();
}
return null;
}
})
.setGroupBackground(Color.parseColor("#48BDFF")) //背景色
.setGroupHeight(DensityUtil.dip2px(this, 35)) //高度
.setDivideColor(Color.parseColor("#CCCCCC")) //分割线颜色
.setDivideHeight(DensityUtil.dip2px(this, 1)) //分割线高度 (默认没有分割线)
.setGroupTextColor(Color.WHITE) //字体颜色
.setGroupTextSize(DensityUtil.sp2px(this, 15)) //字体大小
.setTextSideMargin(DensityUtil.dip2px(this, 10)) // 边距 靠左时为左边距 靠右时为右边距
.isAlignLeft(false) //靠右显示 （默认靠左）
.build();
mRecyclerView.addItemDecoration(decoration);
mAdapter = new RecyclerView.Adapter() {
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_recycler_view, parent, false);
return new Holder(view);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
Holder holder = (Holder) viewHolder;
holder.mTextView.setText(dataList.get(position).getName());
}
@Override
public int getItemCount() {
return dataList.size();
}
};
mRecyclerView.setAdapter(mAdapter);
}
static class Holder extends RecyclerView.ViewHolder {
TextView mTextView;
public Holder(View itemView) {
super(itemView);
mTextView =itemView.findViewById(R.id.tv);
}
}
}
mainactivity 的布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/rv"
android:layout_width="match_parent"
android:layout_height="match_parent"></android.support.v7.widget.RecyclerView>
</LinearLayout>
item_recycle_view的布局
<?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="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/tv"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="#FFFFFF"
android:gravity="center"
android:textColor="#666666"
android:textSize="15sp"/>
</LinearLayout>