Question

我正在使用firebaseui的Firebase回收器适配器来显示数据库中的值这是我从数据库中获取值的代码

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

    mRef = FirebaseDatabase.getInstance().getReference();

    listRef =mRef.child("itemlist");


    recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
    recyclerViewLayoutManager = new LinearLayoutManager(this);
    recyclerView.setHasFixedSize(false);
    recyclerView.setLayoutManager(recyclerViewLayoutManager);

    recyclerView.addOnItemTouchListener(
            new RecyclerItemClickListener(MainActivity.this, recyclerView, new RecyclerItemClickListener.OnItemClickListener() {
                @Override
                public void onItemClick(View childView, int position) {
                    Log.v(TAG,"YouClickon"+ position);


                }
            }){

            }
    );
}

@Override
protected void onStart() {
    super.onStart();

    attachRecyclerViewAdapter();

}

@Override
protected void onStop() {
    super.onStop();

    if(mRecyclerViewAdapter != null){
        mRecyclerViewAdapter.cleanup();
    }
}

private void attachRecyclerViewAdapter() {

    mRecyclerViewAdapter = new FirebaseRecyclerAdapter<ItemList, ItemHolder>(
            ItemList.class,
            R.layout.shop_recycler_row_view,
            ItemHolder.class,
            listRef
    ) {
        @Override
        protected void populateViewHolder(ItemHolder itemHolder, ItemList item, int i) {
            itemHolder.setName(item.getName());
            itemHolder.setDescription(item.getDescription());
        }
    };

    recyclerView.setAdapter(mRecyclerViewAdapter);
}


public static class ItemHolder extends RecyclerView.ViewHolder{
    View mView;

    public ItemHolder(View itemView) {
        super(itemView);
        mView = itemView;
    }

    public void setName(String name){
        TextView field = (TextView) mView.findViewById(R.id.tv_shopName);
        field.setText(name);
    }

    public void setDescription(String text) {
        TextView field = (TextView) mView.findViewById(R.id.tv_shopDesc);
        field.setText(text);
    }



}

数据库的json结构如下：

{
 "itemlist" : {
"-KJ5USfIBXgAfpurhHjE" : {
  "-KJ5Uf0XkahJ5fqio8kq" : {
    "description" : "Minal",
    "img_url" : "HIU",
    "name" : "Milan ni item"
  },
  "-KJ5Ul7ZT2oKuCLxOY78" : {
    "description" : "nathi keviðŸ˜·ðŸ˜·",
    "img_url" : "HIU",
    "name" : "mari item"
  }
},
"-KJ5VJtTUQqKnHmuu1tY" : {
  "-KJ5d7aggDnYKz65PMHa" : {
    "description" : "whaajakakq",
    "img_url" : "HIU",
    "name" : "Sweet"
  }
}
},
"shoplist" : {
"-KJ5USfIBXgAfpurhHjE" : {
  "description" : "Milan ne Maru mane aaje muki ne chalya gaya fir ek baar",
  "img_url" : "https://firebasestorage.googleapis.com/v0/b/fooder-5eba6.appspot.com/o/shop_images%2Fimage%3A26208?alt=media&token=75228031-dccd-4c45-bfcf-abe634d58bc6",
  "name" : "31st May 2016"
},
"-KJ5Uy4ALcLcJhKH6o9U" : {
  "description" : "shop bhavnagar",
  "img_url" : "https://firebasestorage.googleapis.com/v0/b/fooder-5eba6.appspot.com/o/shop_images%2Fimage%3A26213?alt=media&token=7aa14525-0fc5-4c11-a8fb-a44ab121bcfa",
  "name" : "Daas"
},
"-KJ5VJtTUQqKnHmuu1tY" : {
  "description" : "dukaan",
  "img_url" : "https://firebasestorage.googleapis.com/v0/b/fooder-5eba6.appspot.com/o/shop_images%2Fimage%3A26203?alt=media&token=748363be-f0ab-45b4-bd7d-f58be2308b6c",
  "name" : "offline"
     }
   }
 }

现在我想显示itemlist中的值。我怎么能这样做？。

Answer 1

我总是从firebase中检索值，如下所示

//GET DATA FROM FIREBASE INTO ARRAYLIST
    fb_to_read.addValuesEventListener....{
        public void onDataChange(DataSnapshot result){
            List<String> lst = new ArrayList<String>(); // Result will be holded Here
            for(DataSnapshot dsp : result.getChildren()){
                lst.add(String.valueOf(dsp.getKey())); //add result into array list
            }
            //NOW YOU HAVE ARRAYLIST WHICH HOLD RESULTS
        for(String data:lst){ 
             Toast.make(context,data,Toast.LONG_LENGTH).show; 
           }
        }
}

无法从firebase数据库中检索值

1 个答案: