multiple selection implementation in saved projects

Author: Teja Vojjala

source-code/app/src/main/java/org/buildmlearn/toolkit/adapter/SavedProjectAdapter.java

@@ -12,7 +12,10 @@
 import org.buildmlearn.toolkit.views.TextViewPlus;
 
 import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
 import java.util.Locale;
+import java.util.Map;
 
 /**
  * @brief Adapter used for showing saved projects in a list
@@ -23,12 +26,12 @@ public class SavedProjectAdapter extends BaseAdapter {
 
     private final Context mContext;
     private final ArrayList<SavedProject> data;
-    private int selectedPosition;
+    private Map selectedPositions;
 
     public SavedProjectAdapter(Context mContext, ArrayList<SavedProject> data) {
         this.mContext = mContext;
         this.data = data;
-        selectedPosition = -1;
+        selectedPositions = new HashMap();
     }
 
     /**
@@ -55,14 +58,35 @@ public long getItemId(int i) {
         return i;
     }
 
-    public int getSelectedPosition() {
-        return selectedPosition;
+    public boolean isPositionSelected(int position)
+    {
+        return selectedPositions.containsKey(position);
     }
 
-    public void setSelectedPosition(int selectedPosition) {
-        this.selectedPosition = selectedPosition;
+    public void putSelectedPosition(int position) {
+        selectedPositions.put(position,true);
     }
 
+    public ArrayList<Integer> getSelectedPositions()
+    {
+        ArrayList<Integer> positions = new ArrayList<>();
+        for(Object key : selectedPositions.keySet())
+        {
+            positions.add((Integer)key);
+        }
+        Collections.sort(positions);
+        return positions;
+    }
+
+    public void removeSelectedPosition(int position)
+    {
+        selectedPositions.remove(position);
+    }
+
+    public int selectedPositionsSize()
+    {
+        return selectedPositions.size();
+    }
     /**
      * {@inheritDoc}
      */
@@ -81,7 +105,7 @@ public View getView(int position, View convertView, ViewGroup parent) {
             holder = (ProjectHolder) convertView.getTag();
         }
 
-        if (selectedPosition == position) {
+        if (selectedPositions.containsKey(position)) {
             convertView.setBackgroundColor(ContextCompat.getColor(mContext, R.color.color_divider));
         } else {
             convertView.setBackgroundColor(0);

source-code/app/src/main/java/org/buildmlearn/toolkit/fragment/LoadProjectFragment.java

@@ -149,17 +149,19 @@ public void onViewCreated(View view, Bundle savedInstanceState) {
         mListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
             @Override
             public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
-                if (mAdapter.getSelectedPosition() == position) {
-                    mAdapter.setSelectedPosition(-1);
+                if (mAdapter.isPositionSelected(position)) {
+                    mAdapter.removeSelectedPosition(position);
                     view.setBackgroundResource(0);
                     restoreColorScheme();
+                    if(mAdapter.selectedPositionsSize()==0)
+                        restoreColorScheme();
                 } else {
                     if (selectedView != null) {
                         selectedView.setBackgroundResource(0);
                     }
                     selectedView = view;
                     view.setBackgroundColor(ContextCompat.getColor(mToolkit, R.color.color_divider));
-                    mAdapter.setSelectedPosition(position);
+                    mAdapter.putSelectedPosition(position);
                     Log.d(TAG, "Position: " + position);
                     changeColorScheme();
                 }
@@ -173,6 +175,26 @@ public boolean onItemLongClick(AdapterView<?> parent, View view, int position, l
      */
     @Override
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+
+        if(mAdapter.selectedPositionsSize() > 0)
+        {
+            if(mAdapter.isPositionSelected(position)) {
+                mAdapter.removeSelectedPosition(position);
+                view.setBackgroundResource(0);
+                if(mAdapter.selectedPositionsSize() == 0)
+                    restoreColorScheme();
+            }
+            else{
+                selectedView = view;
+                view.setBackgroundColor(ContextCompat.getColor(mToolkit, R.color.color_divider));
+                mAdapter.putSelectedPosition(position);
+                Log.d(TAG, "Position: " + position);
+                changeColorScheme();
+
+            }
+            return ;
+        }
+
         SavedProject project = savedProjects.get(position);
         Template[] templates = Template.values();
         for (int i = 0; i < templates.length; i++) {
@@ -331,31 +353,39 @@ public boolean onOptionsItemSelected(final MenuItem item) {
 
                 final MaterialDialog dialog = new MaterialDialog.Builder(activity)
                         .title(R.string.dialog_delete_title)
-                        .content(R.string.dialog_delete_msg)
                         .positiveText(R.string.dialog_yes)
                         .negativeText(R.string.dialog_no)
                         .build();
 
+                if(mAdapter.selectedPositionsSize()==1)
+                    dialog.setContent(R.string.dialog_delete_msg);
+                else
+                    dialog.setContent(R.string.dialog_delete_multiple);
                 dialog.getActionButton(DialogAction.POSITIVE).setOnClickListener(new View.OnClickListener() {
                     @Override
                     public void onClick(View v) {
                         dialog.dismiss();
-                        deleteItem(mAdapter.getSelectedPosition());
+                        deleteItems();
                         restoreSelectedView();
                     }
                 });
                 dialog.show();
                 break;
             case R.id.action_share:
 
-                SavedProject project = savedProjects.get(mAdapter.getSelectedPosition());
-                File file = new File(project.getFile().getPath());
-
-                Uri fileUri = Uri.fromFile(file);
+                ArrayList<Integer> selectedPositions = mAdapter.getSelectedPositions();
                 ArrayList<Uri> uris = new ArrayList<>();
                 Intent sendIntent = new Intent(Intent.ACTION_SEND_MULTIPLE);
                 sendIntent.setType("application/zip");
-                uris.add(fileUri);
+                for(int selectedPosition : selectedPositions) {
+                    if(selectedPosition != selectedPositions.get(0))
+                        selectedPosition--;
+                    SavedProject project = savedProjects.get(selectedPosition);
+                    File file = new File(project.getFile().getPath());
+
+                    Uri fileUri = Uri.fromFile(file);
+                    uris.add(fileUri);
+                }
                 sendIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
                 startActivity(Intent.createChooser(sendIntent, null));
                 break;
@@ -411,6 +441,27 @@ public boolean onKey(View v, int keyCode, KeyEvent event) {
                 editSearch.requestFocus();
                 InputMethodManager imm = (InputMethodManager) getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
                 imm.showSoftInput(editSearch, InputMethodManager.SHOW_IMPLICIT);
+                break;
+
+            case R.id.action_select_all:
+                for(int i=0;i<mAdapter.getCount();i++) {
+                    if (!mAdapter.isPositionSelected(i))
+                    {
+                        mListView.getChildAt(i).setBackgroundColor(ContextCompat.getColor(mToolkit, R.color.color_divider));
+                        mAdapter.putSelectedPosition(i);
+                        changeColorScheme();
+                    }
+                }
+                break;
+
+            case R.id.action_unselect_all:
+                for(int i=0;i<mAdapter.getCount();i++)
+                    if(mAdapter.isPositionSelected(i)) {
+                        mListView.getChildAt(i).setBackgroundColor(0);
+                        mAdapter.removeSelectedPosition(i);
+                    }
+                restoreColorScheme();
+                break;
 
             default: //do nothing
                 break;
@@ -421,19 +472,26 @@ public boolean onKey(View v, int keyCode, KeyEvent event) {
     /**
      * @brief Removes selected project item
      */
-    private void deleteItem(int selectedPosition) {
-        SavedProject project = savedProjects.get(selectedPosition);
-        File file = new File(project.getFile().getPath());
-        boolean deleted = file.delete();
-        if (deleted) {
-            savedProjects.remove(selectedPosition);
-            mAdapter.setSelectedPosition(-1);
-            mAdapter.notifyDataSetChanged();
-            setEmptyText();
+
+    private void deleteItems() {
+        ArrayList<Integer> selectedPositions = mAdapter.getSelectedPositions();
+        boolean deleted = false;
+        for(int selectedPosition : selectedPositions) {
+            if(selectedPosition!=selectedPositions.get(0))selectedPosition--;
+            SavedProject project = savedProjects.get(selectedPosition);
+            File file = new File(project.getFile().getPath());
+            deleted = file.delete();
+            if (deleted) {
+                savedProjects.remove(selectedPosition);
+                mAdapter.removeSelectedPosition(selectedPosition);
+                mAdapter.notifyDataSetChanged();
+                setEmptyText();
+            }
+        }
+        if(deleted)
             Toast.makeText(activity, "Project Successfully Deleted!", Toast.LENGTH_SHORT).show();
-        } else {
+        else
             Toast.makeText(activity, "Project Deletion Failed!", Toast.LENGTH_SHORT).show();
-        }
     }
 
     /**

source-code/app/src/main/res/drawable-hdpi/ic_select_all_white_24dp.png

@@ -8,14 +8,29 @@
         android:icon="@drawable/ic_share_white_24dp"
         android:orderInCategory="1"
         android:title="@string/bottom_sheet_share_apk"
-        app:showAsAction="ifRoom" />
+        app:showAsAction="always" />
 
     <item
         android:id="@+id/action_delete"
         android:icon="@drawable/menu_delete_template_item"
         android:orderInCategory="2"
         android:title="@string/menu_delete_template_item"
-        app:showAsAction="ifRoom" />
+        app:showAsAction="always" />
 
+    <item
+        android:id="@+id/action_select_all"
+        android:icon="@drawable/ic_select_all_white_24dp"
+        android:orderInCategory="3"
+        android:title="@string/menu_select_all"
+        app:showAsAction="always"
+        />
+
+    <item
+        android:id="@+id/action_unselect_all"
+        android:icon="@drawable/ic_close"
+        android:orderInCategory="4"
+        android:title="@string/menu_unselect_all"
+        app:showAsAction="always"
+        />
 
 </menu>