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从firebase检索所有值并将其放入TextView

textview firebase-realtime-database firebase android

-4

user5434198 · 技术社区 · 7 年前

下面是我尝试的代码,但我只能检索Dosa2。

mMessagesDatabaseReference = mFirebaseDatabase.getReference("messages");

// Attach a listener to read the data at our posts reference
        mMessagesDatabaseReference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                for (DataSnapshot postSnapshot: dataSnapshot.getChildren()) {
                    Food food = postSnapshot.getValue(Food.class);
                    foodnameTextView.setText(food.getFoodname()+"\n");
                }}

            @Override
            public void onCancelled(DatabaseError databaseError) {
                System.out.println("The read failed: " + databaseError.getCode());
            }
        });

1 回复 | 直到 7 年前

Burhanuddin Rashid Abdilahi 7 年前

 mMessagesDatabaseReference = mFirebaseDatabase.getReference("messages");

    // Attach a listener to read the data at our posts reference
            String foodName="";
            mMessagesDatabaseReference.addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    for (DataSnapshot postSnapshot: dataSnapshot.getChildren()) {
                        Food food = postSnapshot.getValue(Food.class);
                        foodName+=food.getFoodname()+"\n";

                    }
                    foodnameTextView.setText(foodName);
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {
                    System.out.println("The read failed: " + databaseError.getCode());
                }
            });

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