我的意思是如何让adapter不是使用model类，而是使用已创建的ArrayList（randomPlaceList）？我从我的Firestore中取出了20条记录，并将其中的3条随机放入ArrayList（randomPlaceList）。现在，我希望我的适配器连接ViewHolder对象而不是model类（Places.class），但是这个早期创建的ArrayList（randomPlaceList），我已经有3个随机记录..
RecycleView类：
public class Myactivity extends AppCompatActivity {
public RecyclerView mResultList;
public FirebaseFirestore mFirestore;
public com.google.firebase.firestore.Query query;
public FirestoreRecyclerAdapter<Places, PlaceViewHolder> firestoreRecyclerAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recycle_activity);
mResultList = findViewById(R.id.list_result);
Boolean l_check1 = getIntent().getExtras().getBoolean("1");
Boolean l_check2 = getIntent().getExtras().getBoolean("2");
Boolean l_check3 = getIntent().getExtras().getBoolean("3");
mFirestore = FirebaseFirestore.getInstance();
if (l_check1) {
query = mFirestore.collection("Places").whereEqualTo("colour", "1").limit(20);
//QUESTION START HERE
query.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
List<Places> placesList = new ArrayList<>();
for (DocumentSnapshot document : task.getResult()) {
Places place = document.toObject(Places.class);
placesList.add(place);
}
int placeCount = placesList.size();
int randomNumber = new Random().nextInt(placeCount);
//THIS ARRAYLIST I WANT TO USE INSTEAD THE PLACES.CLASS
List<Places> randomPlaceList = new ArrayList<>();
for (int i=1; i<=3; i++) {
randomPlaceList.add(placesList.get(randomNumber));
}
}
}
});
} else if (l_check2) {
query = mFirestore.collection("Places").whereEqualTo("colour", "2").limit(3);
} else if (l_check3) {
query = mFirestore.collection("Places").whereEqualTo("colour", "3").limit(3);
}
mResultList.setLayoutManager(new LinearLayoutManager(this));
FirestoreRecyclerOptions<Places> options = new FirestoreRecyclerOptions.Builder<Places>()
.setQuery(query, Places.class)
.build();
firestoreRecyclerAdapter = new FirestoreRecyclerAdapter<Places, PlaceViewHolder>(options) {
@Override
protected void onBindViewHolder(PlaceViewHolder holder, int position, Places model) {
holder.setDetails(getApplicationContext(), model.getName(), model.getImage());
}
@Override
public PlaceViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_layout, parent, false);
return new PlaceViewHolder(view);
}
};
mResultList.setAdapter(firestoreRecyclerAdapter);
}
@Override
protected void onStart() {
super.onStart();
firestoreRecyclerAdapter.startListening();
}
class PlaceViewHolder extends RecyclerView.ViewHolder {
View mView;
public PlaceViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setDetails(Context context, String placeName, String placeImage) {
final TextView place_Name = mView.findViewById(R.id.text_image_id);
ImageView place_Image = mView.findViewById(R.id.image_id);
place_Name.setText(placeName);
Glide.with(context).load(placeImage).into(place_Image);
place_Name.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(), Card_activity.class);
intent.putExtra("qwerty", place_Name.getText());
startActivity(intent);
}
});
}
}
@Override
protected void onStop() {
super.onStop();
if (firestoreRecyclerAdapter != null) {
firestoreRecyclerAdapter.stopListening();
}
}
}
model方法中使用的OnCreate类，用于query，但我需要在Adapter中使用randomPlaceList来获取3条记录，已经提到了它。换句话说，使用2个模型类，如果我可以这样说..：
我的模特课：
public class Places {
private String image, name;
public Places() { }
public Places(String image, String name) {
this.image = image;
this.name = name;
}
public String getImage() { return image; }
public String getName() { return name; }
}
使用LISTVIEW编辑：
MyListAdaper：
class MyListAdapter extends ArrayAdapter {
public MyListAdapter(Context context, int resource,List<Places> randomPLaceList) {
super(context, 0, randomPLaceList);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater)this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.item_list, parent, false);
}
TextView place_Name = convertView.findViewById(R.id.text_image_id);
ImageView place_Image = convertView.findViewById(R.id.image_id);
Places places = (Places) getItem(position);
place_Name.setText(places.getName());
Glide.with(getContext()).load(places.getImage()).into(place_Image);
return convertView;
}
}
ListViewPlaces.class：
public class ListViewPlaces extends AppCompatActivity {
public ListView mListView;
public MyListAdapter myListAdapter;
public FirebaseFirestore mFirestore;
public Query query;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_view_places);
Boolean l_check1 = getIntent().getExtras().getBoolean("1");
mFirestore = FirebaseFirestore.getInstance();
if (l_check1) {
query = mFirestore.collection("Places").whereEqualTo("meet", "1").whereEqualTo("cash", "1").limit(7);
query.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
List<Places> placesList = new ArrayList<>();
for (DocumentSnapshot document : task.getResult()) {
Places place = document.toObject(Places.class);
placesList.add(place);
}
//mListView = findViewById(R.id.place_list);
//mListView.setAdapter(myListAdapter);
final int placeCount = placesList.size();
final Random randomGenerator = new Random();
List<Places> randomPlaceList = new ArrayList<>();
for (int i = 1; i <= 3; i++) {
randomPlaceList.add(placesList.get(randomGenerator.nextInt(placeCount)));
}
ListView mListView = (ListView) findViewById(R.id.place_list);
MyListAdapter mListAdapter = new MyListAdapter(this, randomPlaceList);
mListView.setAdapter(mListAdapter);
}
}
});
}
}
}
错误：
错误：类MyListAdapter中的构造函数MyListAdapter不能 适用于给定类型; required：Context，int，找到的列表： ＆gt ;,列出原因： 实际和正式的参数列表长度不同