multi-deletion and unselect all implemented from scratch

Author: codingblazer

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

@@ -1,6 +1,7 @@
 package org.buildmlearn.toolkit.adapter;
 
 import android.content.Context;
+import android.support.v4.content.ContextCompat;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -11,7 +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;
 
 /**
  * Created by scopeinfinity on 10/3/16.
@@ -24,10 +28,12 @@ public class DraftProjectAdapter extends BaseAdapter {
 
     private final Context mContext;
     private final ArrayList<SavedProject> data;
+    private Map selectedPositions;
 
     public DraftProjectAdapter(Context mContext, ArrayList<SavedProject> data) {
         this.mContext = mContext;
         this.data = data;
+        selectedPositions=new HashMap();
     }
 
     /**
@@ -57,6 +63,36 @@ public long getItemId(int i) {
     /**
      * {@inheritDoc}
      */
+
+    public boolean isPositionSelected(int position)
+    {
+        return selectedPositions.containsKey(position);
+    }
+
+    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,Collections.reverseOrder());
+        return positions;
+    }
+
+    public void removeSelectedPosition(int position)
+    {
+        selectedPositions.remove(position);
+    }
+
+    public int selectedPositionsSize()
+    {
+        return selectedPositions.size();
+    }
     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
         LayoutInflater mInflater;
@@ -72,6 +108,12 @@ public View getView(int position, View convertView, ViewGroup parent) {
             holder = (DraftHolder) convertView.getTag();
         }
 
+        if (selectedPositions.containsKey(position)) {
+            convertView.setBackgroundColor(ContextCompat.getColor(mContext, R.color.color_divider));
+        } else {
+            convertView.setBackgroundColor(0);
+        }
+
         SavedProject projectData = getItem(position);
         holder.draftSubtitle.setText(String.format(Locale.ENGLISH, "Last Modified: %s", projectData.getTime()));
         holder.draftTitle.setText(String.format(Locale.ENGLISH, "Drafted on %s", projectData.getDate()));

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

@@ -105,20 +105,18 @@ 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 (selectedPosition == position) {
-                    selectedPosition = -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;
-                    selectedPosition = position;
-                    Log.d(TAG, "Position: " + selectedPosition);
                     view.setBackgroundColor(ContextCompat.getColor(getActivity(), R.color.color_divider));
+                    mAdapter.putSelectedPosition(position);
                     changeColorScheme();
                 }
+
+
                 return true;
             }
         });
@@ -129,6 +127,23 @@ 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{
+                view.setBackgroundColor(ContextCompat.getColor(mToolkit, R.color.color_divider));
+                mAdapter.putSelectedPosition(position);
+                Log.d(TAG, "Position: " + position);
+                changeColorScheme();
+
+            }
+            return ;
+        }
         SavedProject project = draftProjects.get(position);
         Template[] templates = Template.values();
         for (int i = 0; i < templates.length; i++) {
@@ -271,6 +286,7 @@ public void onPrepareOptionsMenu(Menu menu) {
     /**
      * {@inheritDoc}
      */
+
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         int id = item.getItemId();
@@ -280,21 +296,45 @@ public boolean onOptionsItemSelected(MenuItem item) {
 
                 final MaterialDialog dialogDelete = 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)
+                    dialogDelete.setContent(R.string.dialog_delete_msg);
+                else
+                    dialogDelete.setContent(R.string.dialog_delete_multiple);
 
                 dialogDelete.getActionButton(DialogAction.POSITIVE).setOnClickListener(new View.OnClickListener() {
                     @Override
                     public void onClick(View v) {
                         dialogDelete.dismiss();
-                        deleteItem(selectedPosition);
+                        deleteItems();
                         restoreSelectedView();
                     }
                 });
                 dialogDelete.show();
                 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;
+
             case R.id.action_delete_all:
 
                 final MaterialDialog dialogDeleteAll = new MaterialDialog.Builder(activity)
@@ -323,18 +363,24 @@ public void onClick(View v) {
     /**
      * @brief Removes selected project item
      */
-    private void deleteItem(int selectedPosition) {
-        SavedProject project = draftProjects.get(selectedPosition);
-        File file = new File(project.getFile().getPath());
-        boolean deleted = file.delete();
-        if (deleted) {
-            draftProjects.remove(selectedPosition);
-            mAdapter.notifyDataSetChanged();
-            setEmptyText();
-            Toast.makeText(activity, getResources().getString(R.string.draft_deleted), Toast.LENGTH_SHORT).show();
-        } else {
-            Toast.makeText(activity, getResources().getString(R.string.draft_deleted_failed), Toast.LENGTH_SHORT).show();
+    private void deleteItems() {
+        ArrayList<Integer> selectedPositions = mAdapter.getSelectedPositions();
+        boolean deleted = false;
+        for(int selectedPosition : selectedPositions) {
+            SavedProject project = draftProjects.get(selectedPosition);
+            File file = new File(project.getFile().getPath());
+            deleted = file.delete();
+            if (deleted) {
+                draftProjects.remove(selectedPosition);
+                mAdapter.removeSelectedPosition(selectedPosition);
+                mAdapter.notifyDataSetChanged();
+                setEmptyText();
+            }
         }
+        if(deleted)
+            Toast.makeText(activity, "Project Successfully Deleted!", Toast.LENGTH_SHORT).show();
+        else
+            Toast.makeText(activity, "Project Deletion Failed!", Toast.LENGTH_SHORT).show();
     }
 
     /**
@@ -361,9 +407,6 @@ private void deleteAllDrafts() {
      * @brief Removes selected color from the selected ListView item when switching from edit mode to normal mode
      */
     private void restoreSelectedView() {
-        if (selectedView != null) {
-            selectedView.setBackgroundResource(0);
-        }
         restoreColorScheme();
     }
 }