如何将用户生成的editText字段保存到Firebase？

Question

我是Firebase和Android的新手。我想创建一个应用程序，用户可以在其中输入他/她想要拥有的多种食物并将其保存到Firebase。现在，我的问题是，与其使用唯一的密钥一一保存数据，不如保存相同的数据实例。它并没有遍历其余输入。

这是我的代码，用于用户生成的editText字段并将其保存到Firebase。

public class AddMenuActivity extends AppCompatActivity {
private EditText menu_added;
private LinearLayout lnrDynamicEditTextHolder;
private EditText edtNoCreate;
private Button btnCreate, btnSave;
private FirebaseAuth auth;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_add_menu);

    lnrDynamicEditTextHolder = (LinearLayout) findViewById(R.id.lnrDynamicEditTextHolder);
    edtNoCreate = (EditText) findViewById(R.id.edtNoCreate);
    btnCreate = (Button) findViewById(R.id.btnCreate);
    btnSave = (Button) findViewById(R.id.btnSave);
    auth = FirebaseAuth.getInstance();


    btnCreate.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(edtNoCreate.getText().toString().length()>0) {
                try {
                    lnrDynamicEditTextHolder.removeAllViews();
                } catch (Throwable e) {
                    e.printStackTrace();
                }

                final int length = Integer.parseInt(edtNoCreate.getText().toString());

                for (int i=0;i<length;i++){
                    final EditText editText = new EditText(AddMenuActivity.this);
                    editText.setId(i+1);
                    editText.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
                    editText.setHint("EditText "+(i+1));
                    lnrDynamicEditTextHolder.addView(editText);


                    btnSave.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            for (int a=0;a<length;a++){
                            final String menu_add = editText.getText().toString().trim();


                            Query menuQuery = FirebaseDatabase.getInstance().getReference().child("Establishment").orderByChild("Estabname").equalTo(menu_add);
                            menuQuery.addListenerForSingleValueEvent(new ValueEventListener() {
                                @Override
                                public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                                    if (dataSnapshot.getChildrenCount()>0){
                                        Toast.makeText(AddMenuActivity.this,"This Name has been taken", Toast.LENGTH_SHORT).show();
                                    }
                                    else{
                                        if (TextUtils.isEmpty(menu_add)) {
                                            Toast.makeText(getApplicationContext(), "Enter an Item!", Toast.LENGTH_SHORT).show();
                                            return;
                                        }
                                        String menu_id = auth.getCurrentUser().getUid();
                                        DatabaseReference current_user_db = FirebaseDatabase.getInstance().getReference().child("Menu");
                                        DatabaseReference pushedPostRef = current_user_db.push();
                                        String postId = pushedPostRef.getKey();

                                        DatabaseReference current_user_db2 = FirebaseDatabase.getInstance().getReference().child("Menu").child(postId);

                                        Map newPost = new HashMap();
                                        newPost.put("Mfood_Name", menu_add);

                                        current_user_db2.setValue(newPost);

                                        startActivity(new Intent(AddMenuActivity.this, ManageEstablishmentActivity.class));

                                    }

                                }

                                @Override
                                public void onCancelled(@NonNull DatabaseError databaseError) {

                                }
                            });

                        }
                        }
                    });
                }

            }
        }
    });
}

这是XML文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="5dp" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <EditText
        android:id="@+id/edtNoCreate"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:hint="Number Of Food's"
        android:inputType="number" />

    <Button
        android:id="@+id/btnCreate"
        android:layout_width="76dp"
        android:layout_height="match_parent"
        android:background="@drawable/rounded_button"
        android:layout_margin="6dp"
        android:text="Create" />

    <Button
        android:id="@+id/btnSave"
        android:layout_width="76dp"
        android:layout_height="match_parent"
        android:background="@drawable/rounded_button"
        android:layout_margin="6dp"
        android:text="Save" />
</LinearLayout>
<ScrollView
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:layout_marginTop="5dp">
    <LinearLayout
        android:id="@+id/lnrDynamicEditTextHolder"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

    </LinearLayout>
</ScrollView>
</LinearLayout>

Answer 1

这样做-

Map newPost = new HashMap();
newPost.put("Mfood_Name", menu_add);
newPost.put("mfood_Quantity", itemQuantity);

current_user_db2.setValue(newPost);

Answer 2

在Firebase Realtime数据库/ Firestore中，您可以以Hashmap（Realtime / Firestore）的形式存储数组和列表。

Cloud Firestore的示例代码片段：

public class MapPost {
    String title;
    Map<String,Boolean> categories;

    public MapPost(String title, Map<String,Boolean> categories) {
        this.title = title;
        this.categories = categories;
    }
}

Map<String, Boolean> categories = new HashMap<>();
categories.put("technology", true);
categories.put("opinion", true);
categories.put("cats", true);
MapPost myMapPost = new MapPost("My great post", categories);