Allow multi pick from gallery on android api >= 18

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

@@ -19,6 +19,7 @@
 package fr.mobdev.goblim.activity;
 
 import android.app.ProgressDialog;
+import android.content.ClipData;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.pm.ActivityInfo;
@@ -26,6 +27,7 @@ import android.database.Cursor;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
 import android.provider.OpenableColumns;
 import android.support.v7.app.AlertDialog;
@@ -512,6 +514,8 @@ public class UploadActivity extends AppCompatActivity {
         //ask for image file
         Intent requestFileIntent = new Intent(Intent.ACTION_PICK);
         requestFileIntent.setType("image/*");
+        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2)
+            requestFileIntent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE,true);
         startActivityForResult(requestFileIntent, 0);
 
     }
@@ -520,10 +524,20 @@ public class UploadActivity extends AppCompatActivity {
     public void onActivityResult(int requestCode, int resultCode,Intent returnIntent) {
         if(resultCode == RESULT_OK){
             //retrieve uri from the request image activity and prepare
-            Uri imageUri = returnIntent.getData();
-            uris.add(imageUri);
-            updateSpanCount();
-            adapter.addUri(this,imageUri);
+            if(Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR2) {
+                Uri imageUri = returnIntent.getData();
+                uris.add(imageUri);
+                updateSpanCount();
+                adapter.addUri(this,imageUri);
+            } else {
+                ClipData clip = returnIntent.getClipData();
+                for(int i = 0; i < clip.getItemCount(); i++) {
+                    Uri imageUri = clip.getItemAt(i).getUri();
+                    uris.add(imageUri);
+                    updateSpanCount();
+                    adapter.addUri(this,imageUri);
+                }
+            }
 
             Button uploadBt = (Button) findViewById(R.id.upload_button);
             uploadBt.setEnabled(false);