Question

请查看我的代码。这段代码实际上是从Firebase获取值并将其附加到网格视图，尽管我发现gridView会使用重复的值进行更新，但是onclick侦听器会正确执行，仅给出唯一的值。

gridView具有重复的值，并且似乎是随机变化的。如果有人可以通过一些示例工作代码来帮助我，那将很有帮助。有人可以帮我解决这个问题吗？

public class Materials extends Fragment {
    private Button btnTEST;
    Context context;
    CardView cardview;
    RelativeLayout.LayoutParams layoutparams;
    TextView textview;
    RelativeLayout relativeLayout;
    GridView grid;
    int l=0,fl=0;
    @Nullable
    @Override

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment

        View v= inflater.inflate(R.layout.fragment_materials, container, false);

        context = v.getContext();

        grid=(GridView)v.findViewById(R.id.grid);


        final String[] web=new String[13];

        final int[] imageId = new int[13];


        DatabaseReference ref = FirebaseDatabase.getInstance().getReference("Materials_management_new/Materials/");

        ref.addValueEventListener(new ValueEventListener() {

            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                if (fl == 0) {
                    for (DataSnapshot snap : dataSnapshot.getChildren()) {

                        web[l] =snap.getKey().toString();
                        l++;
                        fl=1;

                    }

                    //= gson.toJson(dataSnapshot);
                    //  Toast.makeText(LoginPage.this, json, Toast.LENGTH_SHORT).show();
                }
                CustomGrid adapter;
                adapter = new CustomGrid(getContext(), web, imageId);
                grid.setAdapter(adapter);
            }
            @Override
            public void onCancelled(DatabaseError databaseError) {
                System.out.println("The read failed: " + databaseError.getCode());
            }
        });

     //   Toast.makeText(getActivity(), "SUccesssssafmlnfka", Toast.LENGTH_SHORT).show();


        grid.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                Toast.makeText(getActivity(), "You Clicked at " +web[+ position], Toast.LENGTH_SHORT).show();

            }
        });



        return v;
    }



}

这是我的自定义网格代码

public class CustomGrid extends BaseAdapter{
    private Context mContext;
    private final String[] web;
    private final int[] Imageid;

    public CustomGrid(Context c,String[] web,int[] Imageid ) {
        mContext = c;
        this.Imageid = Imageid;
        this.web = web;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return web.length;
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        View grid;
        LayoutInflater inflater = (LayoutInflater) mContext
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        if (convertView == null) {

            grid = new View(mContext);
            grid = inflater.inflate(R.layout.grid_single, null);
            TextView textView = (TextView) grid.findViewById(R.id.grid_text);
            ImageView imageView = (ImageView)grid.findViewById(R.id.grid_image);
            textView.setText(web[position]);
            imageView.setImageResource(Imageid[position]);
        } else {
            grid = (View) convertView;
        }

        return grid;
    }
}

Answer 1

如果要按顺序排列项目列表，则可以使用数据库查询对其进行排序，还可以设置要建立索引的数据库的规则，否则整个安装将在客户端完成。

请参阅对https://firebase.google.com/docs/database/android/lists-of-data?authuser=1中的数据进行排序和过滤

Firebase数据网格视图项目在网格视图中重复

1 个答案: