Fix bug that produce crash due to multiple touch on upload

app/src/main/java/fr/mobdev/goblim/activity/UploadActivity.java

@@ -74,6 +74,7 @@ public class UploadActivity extends AppCompatActivity {
     private List<Integer> deletedDays;
     private ProgressDialog progressDialog;
     private ImageListAdapter adapter;
+    private boolean uploadInProgress;
 
     //static value to handle storage durations options
     private static final int NEVER = 0;
@@ -86,6 +87,7 @@ public class UploadActivity extends AppCompatActivity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.upload);
+        uploadInProgress = false;
 
         Toolbar toolbar = (Toolbar) findViewById(R.id.upload_toolbar);
         setSupportActionBar(toolbar);
@@ -230,6 +232,7 @@ public class UploadActivity extends AppCompatActivity {
 
             @Override
             public void allFileUploaded() {
+                uploadInProgress = false;
                 runOnUiThread(new Runnable() {
                     @Override
                     public void run() {
@@ -452,6 +455,9 @@ public class UploadActivity extends AppCompatActivity {
     }
 
     private void uploadImages(List<Uri> imageUris) {
+        if(uploadInProgress)
+            return;
+        uploadInProgress = true;
         //what server we use
         Spinner urlSpinner = (Spinner)findViewById(R.id.servers_spinner);
         int pos = urlSpinner.getSelectedItemPosition();
@@ -462,6 +468,7 @@ public class UploadActivity extends AppCompatActivity {
                     Toast.makeText(UploadActivity.this, getString(R.string.server_list_error), Toast.LENGTH_LONG).show();
                 }
             });
+            uploadInProgress = false;
             return;
         }
         String url = urls.get(pos);