Android 具有多个列的RecyclerView
我正在使用FirebaseUi填充回收视图。这是我的数据库: 字段1 1:“a” 2:“ab” 3:“abc” 字段2 1:“b” 2:“公元前” 3:“bcd” 字段3 1:“c” 2:“cd” 3:“cde” 使用Android 具有多个列的RecyclerView,android,android-recyclerview,Android,Android Recyclerview,我正在使用FirebaseUi填充回收视图。这是我的数据库: 字段1 1:“a” 2:“ab” 3:“abc” 字段2 1:“b” 2:“公元前” 3:“bcd” 字段3 1:“c” 2:“cd” 3:“cde” 使用GridLayoutManager(this,3,LinearLayoutManager.VERTICAL,false)recyclerview中有3列,如下所示: a、b、c ab bc cd abc bcd cde 我如何取而代之地检索具有此结构的数据 a ab abc b b
GridLayoutManager(this,3,LinearLayoutManager.VERTICAL,false)
recyclerview中有3列,如下所示:
a、b、c
ab bc cd
abc bcd cde
我如何取而代之地检索具有此结构的数据
a ab abc
b bc bcd
c-cd-cde
感谢您的建议。编写此代码
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private FirebaseFirestore mDb;
private List<String> mList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.reccyclerView);
mDb = FirebaseFirestore.getInstance();
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new GridLayoutManager(this, 3, GridLayout.VERTICAL, false));
final NewAdapter adapter = new NewAdapter(mList);
recyclerView.setAdapter(adapter);
mDb.collection("eg")
.get()
.addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
for (QueryDocumentSnapshot ds: task.getResult()) {
mList.add(ds.getString("1"));
mList.add(ds.getString("2"));
mList.add(ds.getString("3"));
adapter.notifyDataSetChanged();
}
}
});
}
public类MainActivity扩展了AppCompatActivity{
私人回收站;
私有FirebaseFirestore mDb;
private List mList=new ArrayList();
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecycleView=findViewById(R.id.RecycleView);
mDb=FirebaseFirestore.getInstance();
recyclerView.setHasFixedSize(true);
setLayoutManager(新的GridLayoutManager(this,3,GridLayout.VERTICAL,false));
最终新适配器=新的新适配器(mList);
recyclerView.setAdapter(适配器);
mDb.集合(“eg”)
.get()
.addOnCompleteListener(新的OnCompleteListener(){
@凌驾
未完成的公共void(@NonNull任务){
对于(QueryDocumentSnapshot ds:task.getResult()){
mList.add(ds.getString(“1”);
mList.add(ds.getString(“2”));
mList.add(ds.getString(“3”);
adapter.notifyDataSetChanged();
}
}
});
}
}
自定义适配器
public class NewAdapter extends RecyclerView.Adapter<NewAdapter.Holder >{
List<String> mList;
public NewAdapter(List<String> mList) {
this.mList = mList;
}
@NonNull
@Override
public Holder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
LayoutInflater inflater = LayoutInflater.from(viewGroup.getContext());
View view = inflater.inflate(R.layout.layout, viewGroup, false);
return new Holder(view);
}
@Override
public void onBindViewHolder(@NonNull Holder holder, int i) {
holder.text.setText(mList.get(i));
}
@Override
public int getItemCount() {
return mList.size();
}
protected class Holder extends RecyclerView.ViewHolder {
TextView text;
public Holder(@NonNull View itemView) {
super(itemView);
text = itemView.findViewById(R.id.textView);
}
}
public类NewAdapter扩展了RecyclerView.Adapter{
列表列表;
公共新适配器(列表mList){
this.mList=mList;
}
@非空
@凌驾
public Holder onCreateViewHolder(@NonNull ViewGroup ViewGroup,int i){
LayoutInflater充气器=LayoutInflater.from(viewGroup.getContext());
视图=充气机。充气(R.layout.layout,viewGroup,false);
返回新的持有者(视图);
}
@凌驾
public void onBindViewHolder(@NonNull Holder,int i){
holder.text.setText(mList.get(i));
}
@凌驾
public int getItemCount(){
返回mList.size();
}
受保护的类持有者扩展了RecyclerView.ViewHolder{
文本查看文本;
公共持有者(@NonNull View itemView){
超级(项目视图);
text=itemView.findviewbyd(R.id.textView);
}
}
}
单列布局
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_centerHorizontal="true"
tools:layout_editor_absoluteX="111dp"
tools:layout_editor_absoluteY="63dp" />
主布局
<android.support.constraint.ConstraintLayout 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:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/reccyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
我越来越
a、b、c
b bc bcd
c-cd-cde