Android: cómo mostrar el gridview en blanco con el botón

He creado un enfoque ficticio para el problema (Para añadir modificar el Gridview dinámicamente):

Crear una actividad Main3Activity

public class Main3Activity extends AppCompatActivity implements ViewClickCallBack { private RecyclerView recyclerView; private GridAdapter gridAdapter; private List<Model> models = new ArrayList<>(); private final int SIZE_NEXT_ITEM = 5; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main3); recyclerView = (RecyclerView) findViewById(R.id.grid_recycle); gridAdapter = new GridAdapter(this); getNextModel(); gridAdapter.setModels(models); RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(this, 3); recyclerView.setLayoutManager(mLayoutManager); recyclerView.setAdapter(gridAdapter); } @Override public void viewClicked(int position) { models.get(position - 1).setUploaded(true);// Set the upload flag as true for the clicked item int gridItemCount = gridAdapter.getItemCount();// Get the total count of items in gridview if ((gridItemCount - position) == 1) { // check if the clicked item is second last, if yes then difference would be 1 getNextModel(); gridAdapter.setModels(models); } else { Toast.makeText(this, "Popup Image picker", Toast.LENGTH_SHORT).show(); } gridAdapter.notifyDataSetChanged(); } /** * Function to get the set (or next set) of objects that * we want to show in GRID view. * * These objects will be added to a list. * This list will act as data source for adapter **/ private void getNextModel() { for (int i = 0; i < SIZE_NEXT_ITEM; i++) { Model model = new Model(); model.setUploaded(false); models.add(model); } } } 

XML como activity_main3

 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="work.sof.ghost.myapplication.Main3Activity"> <android.support.v7.widget.RecyclerView android:id="@+id/grid_recycle" android:layout_width="match_parent" android:layout_height="wrap_content"/> </RelativeLayout> 

Un adaptador dice GridAdapter

 public class GridAdapter extends RecyclerView.Adapter<GridAdapter.GridViewHolder> { private ViewClickCallBack viewClickCallBack; private List<Model> models; public GridAdapter(ViewClickCallBack viewClickCallBack) { this.viewClickCallBack = viewClickCallBack; } class GridViewHolder extends RecyclerView.ViewHolder { public TextView textView; public GridViewHolder(View itemView) { super(itemView); textView = (TextView) itemView.findViewById(R.id.text_some); textView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (viewClickCallBack != null) { Log.e("Element Index", "" + getAdapterPosition()); /** * Increment the position by 1, as getAdapterPosition will * return the index (count starts from 0) of the element. * Hence, to simplify, we will increment the index by one, * so that when we calculate the second last element, we will * check the difference for 1. * */ viewClickCallBack.viewClicked(getAdapterPosition() + 1); } } }); } } @Override public GridViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View itemView = LayoutInflater.from(parent.getContext()) .inflate(R.layout.grid_view, parent, false); return new GridViewHolder(itemView); } @Override public void onBindViewHolder(GridViewHolder holder, int position) { Model model = getModel(position); if (model.isUploaded()) { holder.textView.setText("-"); } else { holder.textView.setText("+"); } } @Override public int getItemCount() { if (models != null) { return models.size(); } return 0; } private Model getModel(int position) { if (models != null) { return models.get(position); } return null; } public void setModels(List<Model> models) { this.models = models; } } 

Modelo de una clase modelo

 public class Model { private String imagePath; private boolean isUploaded; public String getImagePath() { return imagePath; } public void setImagePath(String imagePath) { this.imagePath = imagePath; } public boolean isUploaded() { return isUploaded; } public void setUploaded(boolean uploaded) { isUploaded = uploaded; } } 

Un diseño para la vista de cuadrícula (sé que no es lo mismo que se muestra en la pregunta :()

 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="5dp" android:layout_marginRight="5dp" android:background="@drawable/rect_drawable" android:orientation="vertical"> <ImageView android:src="@drawable/ic_launcher" android:id="@+id/image_holder" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:layout_gravity="right" android:id="@+id/text_some" android:layout_margin="10dp" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="25sp" android:text="+" /> </LinearLayout> 

Un archivo dibujable rect_drawable

 <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <size android:width="6dp" android:height="6dp" /> <solid android:color="@color/colorPrimary" /> </shape> 

Para la pregunta alternativa

" Cómo enviar varias imágenes al servidor a través de AsyncTask tan pronto como el usuario presione el botón Guardar o Hecho ":

Utilizar

a) executeOnExecutor (java.util.concurrent.Executor, Object []) con THREAD_POOL_EXECUTOR . Para enviar una imagen por tarea asíncrona en paralelo, Más información en https://developer.android.com/reference/android/os/AsyncTask.html

o

b) Puede seguir https://stackoverflow.com/a/7130806/1920735

Esto mostrará la interfaz de usuario de este modo