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誰も "食品"というノードからデータを取得してRecyclerViewに入れてもらうことはできますか？これらは私が取り組んできたファイルですが、空のリストであることが分かります。私はインターネットでのチュートリアルを見てきましたが、それらのほとんどはFirebaseの古いバージョンでした。最近、Firebase UIが更新され、データバインディングプロセスは、これは私のデータベース構造であるFirebase UI 3.0.0：リサイクルビューにデータを取得
彼らの新しいFirebaseRecyclerAdapter構造に変更されました：
private RecyclerView mRecycleView;
private Query query;
private FirebaseRecyclerOptions<Meal> options;
private DatabaseReference mDatabase;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_food_list_row);
mDatabase = FirebaseDatabase.getInstance().getReference().child("foods");
//Recycle View
mRecycleView = (RecyclerView) findViewById(R.id.meal_items);
mRecycleView.setHasFixedSize(true);
mRecycleView.setLayoutManager(new LinearLayoutManager(this));
}
@Override
protected void onStart() {
super.onStart();
query = FirebaseDatabase.getInstance().getReferenceFromUrl("https://mealplanner-ec8ca.firebaseio.com/foods/AntipastoSalad");
options = new FirebaseRecyclerOptions.Builder<Meal>()
.setQuery(query, Meal.class)
.build();
FirebaseRecyclerAdapter<Meal, FoodListRowActivity.MealRowHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Meal, FoodListRowActivity.MealRowHolder>(
options) {
@Override
public FoodListRowActivity.MealRowHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.food_row, parent, false);
return new FoodListRowActivity.MealRowHolder(v);
}
@Override
protected void onBindViewHolder(FoodListRowActivity.MealRowHolder holder, int position, Meal current) {
holder.setTitle(current.getName());
String duration = current.getDuration() + "min";
holder.setDuration(duration);
}
};
//Populate Item into Adapter
mRecycleView.setAdapter(firebaseRecyclerAdapter);
mRecycleView.addOnItemTouchListener(new RecycleViewItemClickListener(this, mRecycleView, new RecycleViewItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
Intent viewMeal = new Intent(FoodListRowActivity.this, CookingInstructionActivity.class);
startActivity(viewMeal);
}
@Override
public void onLongItemClick(View view, int position) {
//TODO: DELETE
}
}));
}
public static class MealRowHolder extends RecyclerView.ViewHolder {
View mView;
public MealRowHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setTitle(String title) {
TextView foodTitle = (TextView) mView.findViewById(R.id.list_item_foodList_name);
foodTitle.setText(title);
}
public void setDuration(String title) {
TextView foodDuration = (TextView) mView.findViewById(R.id.list_item_foodList_calories);
foodDuration.setText(title);
}
}
}
とクラス：これは私の活動である
"foods" : {
"AntipastoSalad" : {
"duration" : "30",
"img" : "https://firebasestorage.googleapis.com/v0/b/mealplanner-ec8ca.appspot.com/o/res%2Fsalad.jpg?alt=media&token=257d4392-8a1f-4fb7-84b5-b63abb4643f4",
"name" : "Antipasto salad",
"type" : "Salad"
},
構造：
public class Meal{
private String img;
private String duration;
private String name;
private String instruction;
public Meal(){
}
public Meal (String img, String duration, String name, String instruction){
this.img = img;
this.name = name;
this.duration = duration;
this.instruction = instruction;
}
public void update(String duration, String name, String instruction)
{
this.name = name;
this.duration = duration;
this.instruction = instruction;
}
public String getName(){
return name;
}
public String getDuration() {
return duration;
}
public String getInstruction() {
return instruction;
}
public String getImg(){return img;}
感謝しますが、Firebase UIの古いバージョンだったようです:( – hjhk19