android: Add filterable adapter for list of installed/selected apps

src/frontends/android/app/src/main/java/org/strongswan/android/ui/adapter/SelectedApplicationsAdapter.java

@@ -0,0 +1,162 @@
+/*
+ * Copyright (C) 2017 Tobias Brunner
+ * HSR Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+package org.strongswan.android.ui.adapter;
+
+import android.content.Context;
+import android.text.TextUtils;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.BaseAdapter;
+import android.widget.Filter;
+import android.widget.Filterable;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import org.strongswan.android.R;
+import org.strongswan.android.ui.widget.CheckableLinearLayout;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class SelectedApplicationsAdapter extends BaseAdapter implements Filterable
+{
+	private Context mContext;
+	private final Object mLock = new Object();
+	private List<SelectedApplicationEntry> mData;
+	private List<SelectedApplicationEntry> mDataFiltered;
+	private SelectedApplicationsFilter mFilter;
+
+	public SelectedApplicationsAdapter(Context context)
+	{
+		mContext = context;
+		mData = mDataFiltered = new ArrayList<>();
+	}
+
+	/**
+	 * Set new data for this adapter.
+	 *
+	 * @param data the new data (null to clear)
+	 */
+	public void setData(List<SelectedApplicationEntry> data)
+	{
+		synchronized (mLock)
+		{
+			mData.clear();
+			mDataFiltered = mData;
+			if (data != null)
+			{
+				mData.addAll(data);
+			}
+		}
+		notifyDataSetChanged();
+	}
+
+	@Override
+	public int getCount()
+	{
+		return mDataFiltered.size();
+	}
+
+	@Override
+	public SelectedApplicationEntry getItem(int position)
+	{
+		return mDataFiltered.get(position);
+	}
+
+	@Override
+	public long getItemId(int position)
+	{
+		return mDataFiltered.get(position).toString().hashCode();
+	}
+
+	@Override
+	public View getView(int position, View convertView, ViewGroup parent)
+	{
+		View view;
+		if (convertView != null)
+		{
+			view = convertView;
+		}
+		else
+		{
+			LayoutInflater inflater = LayoutInflater.from(mContext);
+			view = inflater.inflate(R.layout.selected_application_item, parent, false);
+		}
+		SelectedApplicationEntry item = getItem(position);
+		CheckableLinearLayout checkable = (CheckableLinearLayout)view;
+		checkable.setChecked(item.isSelected());
+		ImageView icon = (ImageView)view.findViewById(R.id.app_icon);
+		icon.setImageDrawable(item.getIcon());
+		TextView text = (TextView)view.findViewById(R.id.app_name);
+		text.setText(item.toString());
+		return view;
+	}
+
+	@Override
+	public Filter getFilter()
+	{
+		if (mFilter == null)
+		{
+			mFilter = new SelectedApplicationsFilter();
+		}
+		return mFilter;
+	}
+
+	private class SelectedApplicationsFilter extends Filter
+	{
+
+		@Override
+		protected FilterResults performFiltering(CharSequence constraint)
+		{
+			FilterResults results = new FilterResults();
+			ArrayList<SelectedApplicationEntry> data, filtered;
+
+			synchronized (mLock)
+			{
+				data = new ArrayList<>(mData);
+			}
+
+			if (TextUtils.isEmpty(constraint))
+			{
+				filtered = data;
+			}
+			else
+			{
+				String filter = constraint.toString().toLowerCase();
+				filtered = new ArrayList<>();
+				for (SelectedApplicationEntry entry : data)
+				{
+					if (entry.toString().toLowerCase().contains(filter))
+					{
+						filtered.add(entry);
+					}
+				}
+			}
+			results.values = filtered;
+			results.count = filtered.size();
+			return results;
+		}
+
+		@Override
+		@SuppressWarnings("unchecked")
+		protected void publishResults(CharSequence constraint, FilterResults results)
+		{
+			mDataFiltered = (List<SelectedApplicationEntry>)results.values;
+			notifyDataSetChanged();
+		}
+	}
+}