我有一个关于如何将图像从实时数据库链接到每个对象的问题。

我的应用程序中有RecyclerView，其中包含Firebase数据库中的所有对象。

对象包含lampTitle，lampDesc，lampType。

我的LightsFragment-包含回收站视图：

public class LightsFragment extends Fragment implements LightsPresenter {

    private RecyclerView RVLights;
    private ArrayList<Light> lights = new ArrayList<>();
    private Light light;
    private LightsAdapter lightsAdapter;
    private LightsView presenter;

    @Override
    public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_lights,container,false);
        presenter = new LightsView(lights,light,this);
        RVLights = view.findViewById(R.id.RVLights);
        presenter.loadData();
        return view;
    }

    @Override
    public void setadapter() {
        lightsAdapter = new LightsAdapter(getactivity(),lights);
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getactivity());
        RVLights.setLayoutManager(layoutManager);
        RVLights.setadapter(lightsAdapter);
    }

LightsAdapter：

public class LightsAdapter extends RecyclerView.Adapter<LightsAdapter.LightsViewHolder> {

    private Context context;
    private ArrayList<Light> lights;

    public LightsAdapter(Context context,ArrayList<Light> lights) {
        this.context = context;
        this.lights = lights;
    }

    @NonNull
    @Override
    public LightsViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
        View view = LayoutInflater.from(parent.getcontext()).inflate(R.layout.lights_item,parent,false);
        return new LightsViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull LightsViewHolder holder,int position) {
        final Light light = lights.get(position);
        holder.TVlightTitle.setText(light.getLampTitle());
        holder.TVLightDesc.setText(light.getLampDesc());
        holder.TVLightType.setText(String.valueOf(light.getLampType()));
    }

    @Override
    public int getItemCount() {
        return lights.size();
    }

    public class LightsViewHolder extends RecyclerView.ViewHolder {

        private TextView TVlightTitle;
        private TextView TVLightDesc;
        private TextView TVLightType;
        private ImageView IVLightImage;

        public LightsViewHolder(@NonNull View itemView) {
            super(itemView);
            TVlightTitle = itemView.findViewById(R.id.lightTitle);
            TVLightDesc = itemView.findViewById(R.id.lightDesc);
            TVLightType = itemView.findViewById(R.id.lightType);
            IVLightImage = itemView.findViewById(R.id.lightImage);
        }
    }

轻量级：

public class Light {

    private int lampType;
    private String lampTitle;
    private String lampDesc;

    public Light(String lampDesc,String lampTitle,int lampType) {
        this.lampType = lampType;
        this.lampTitle = lampTitle;
        this.lampDesc = lampDesc;
    }

    public Light() {
    }

    public int getLampType() {
        return lampType;
    }

    public void setLampType(int lampType) {
        this.lampType = lampType;
    }

    public String getLampTitle() {
        return lampTitle;
    }

    public void setLampTitle(String lampTitle) {
        this.lampTitle = lampTitle;
    }

    public String getLampDesc() {
        return lampDesc;
    }

    public void setLampDesc(String lampDesc) {
        this.lampDesc = lampDesc;
    }

}

点亮演示者并查看：

public interface LightsPresenter {

    void setadapter();

}

public class LightsView {

    private ArrayList<Light> lights = new ArrayList<>();
    private Light light;
    private FirebaseDatabase db;
    private DatabaseReference allLights;
    private LightsPresenter lightsPresenter;

    public LightsView(ArrayList<Light> lights,Light light,LightsPresenter lightsPresenter) {
        this.lights = lights;
        this.light = light;
        this.lightsPresenter = lightsPresenter;
    }

    public void loadData() {
        db = FirebaseDatabase.getInstance();
        allLights = db.getReference("AllLights");

        allLights.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull Datasnapshot datasnapshot) {
                for (Datasnapshot datasnapshot1 : datasnapshot.getchildren()) {
                    light = datasnapshot1.getvalue(Light.class);
                    lights.add(light);
                    Log.i("LightsDataLoaded","true " + light.getLampTitle());
                }
                lightsPresenter.setadapter();

            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
                Log.i("LightsDataLoaded","false ");

            }
        });
    }

}

我得到的结果是：