add grid view option when choosing a file from within the app

res/menu/upload_files_picker.xml

@@ -39,4 +39,10 @@
         app:showAsAction="never"
         android:title="@string/actionbar_sort"
         android:contentDescription="@string/actionbar_sort"/>
+    <item
+        android:id="@+id/action_switch_view"
+        android:icon="@drawable/ic_view_module"
+        android:orderInCategory="3"
+        app:showAsAction="never"
+        android:title="@string/action_switch_grid_view" />
 </menu>

src/com/owncloud/android/ui/activity/UploadFilesActivity.java

@@ -29,6 +29,8 @@ import android.os.AsyncTask;
 import android.os.Bundle;
 import android.os.Environment;
 import android.support.v4.app.DialogFragment;
+import android.support.v4.app.Fragment;
+import android.support.v4.content.ContextCompat;
 import android.support.v7.app.ActionBar;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -46,6 +48,7 @@ import com.owncloud.android.lib.common.utils.Log_OC;
 import com.owncloud.android.ui.dialog.ConfirmationDialogFragment;
 import com.owncloud.android.ui.dialog.ConfirmationDialogFragment.ConfirmationDialogFragmentListener;
 import com.owncloud.android.ui.dialog.IndeterminateProgressDialog;
+import com.owncloud.android.ui.fragment.ExtendedListFragment;
 import com.owncloud.android.ui.fragment.LocalFileListFragment;
 import com.owncloud.android.utils.FileStorageUtils;
 
@@ -223,6 +226,20 @@ public class UploadFilesActivity extends FileActivity implements
                 builder.create().show();
                 break;
             }
+            case R.id.action_switch_view: {
+                if (isGridView()) {
+                    item.setTitle(getString(R.string.action_switch_grid_view));
+                    item.setIcon(ContextCompat.getDrawable(getApplicationContext(),
+                            R.drawable.ic_view_module));
+                    mFileListFragment.switchToListView();
+                } else {
+                    item.setTitle(getApplicationContext().getString(R.string.action_switch_list_view));
+                    item.setIcon(ContextCompat.getDrawable(getApplicationContext(),
+                            R.drawable.ic_view_list));
+                    mFileListFragment.switchToGridView();
+                }
+                return true;
+            }
             default:
                 retval = super.onOptionsItemSelected(item);
         }
@@ -515,4 +532,17 @@ public class UploadFilesActivity extends FileActivity implements
             finish();
         }
     }
+
+    private boolean isGridView() {
+        return getListOfFilesFragment().isGridEnabled();
+    }
+
+    private ExtendedListFragment getListOfFilesFragment() {
+        Fragment listOfFiles = mFileListFragment;
+        if (listOfFiles != null) {
+            return (ExtendedListFragment) listOfFiles;
+        }
+        Log_OC.e(TAG, "Access to unexisting list of files fragment!!");
+        return null;
+    }
 }

src/com/owncloud/android/ui/adapter/LocalFileListAdapter.java

@@ -25,6 +25,7 @@ import android.graphics.Bitmap;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.AbsListView;
 import android.widget.BaseAdapter;
 import android.widget.ImageView;
 import android.widget.ListView;
@@ -141,8 +142,8 @@ public class LocalFileListAdapter extends BaseAdapter implements FilterableListA
                 fileSizeV.setVisibility(View.VISIBLE);
                 fileSizeV.setText(DisplayUtils.bytesToHumanReadable(file.length()));
 
-                ListView parentList = (ListView) parent;
-                if (parentList.getChoiceMode() == ListView.CHOICE_MODE_NONE) { 
+                AbsListView parentList = (AbsListView) parent;
+                if (parentList.getChoiceMode() == ListView.CHOICE_MODE_NONE) {
                     checkBoxV.setVisibility(View.GONE);
                 } else {
                     if (parentList.isItemChecked(position)) {

src/com/owncloud/android/ui/fragment/LocalFileListFragment.java

@@ -30,6 +30,7 @@ import android.util.SparseBooleanArray;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.AbsListView;
 import android.widget.AdapterView;
 import android.widget.ImageView;
 import android.widget.ListView;
@@ -127,7 +128,7 @@ public class LocalFileListFragment extends ExtendedListFragment {
             } else {    /// Click on a file
                 ImageView checkBoxV = (ImageView) v.findViewById(R.id.custom_checkbox);
                 if (checkBoxV != null) {
-                    if (((ListView)getListView()).isItemChecked(position)) {
+                    if (((AbsListView)getListView()).isItemChecked(position)) {
                         checkBoxV.setImageResource(R.drawable.ic_checkbox_marked);
                     } else {
                         checkBoxV.setImageResource(R.drawable.ic_checkbox_blank_outline);
@@ -206,7 +207,7 @@ public class LocalFileListFragment extends ExtendedListFragment {
         }
 
         // by now, only files in the same directory will be kept as selected
-        ((ListView)mCurrentListView).clearChoices();
+        ((AbsListView)mCurrentListView).clearChoices();
         mAdapter.swapDirectory(directory);
         if (mDirectory == null || !mDirectory.equals(directory)) {
             mCurrentListView.setSelection(0);
@@ -222,7 +223,7 @@ public class LocalFileListFragment extends ExtendedListFragment {
      */
     public String[] getCheckedFilePaths() {
         ArrayList<String> result = new ArrayList<String>();
-        SparseBooleanArray positions = ((ListView)mCurrentListView).getCheckedItemPositions();
+        SparseBooleanArray positions = ((AbsListView)mCurrentListView).getCheckedItemPositions();
         if (positions.size() > 0) {
             for (int i = 0; i < positions.size(); i++) {
                 if (positions.get(positions.keyAt(i)) == true) {
@@ -254,7 +255,7 @@ public class LocalFileListFragment extends ExtendedListFragment {
      * @param select <code>true</code> to select all, <code>false</code> to deselect all
      */
     public void selectAllFiles(boolean select) {
-        ListView listView = (ListView) getListView();
+        AbsListView listView = (AbsListView) getListView();
         for (int position = 0; position < listView.getCount(); position++) {
             File file = (File) mAdapter.getItem(position);
             if (file.isFile()) {