Java tutorial
/* * Copyright (C) 2017 Ashar Khan <ashar786khan@gmail.com> * * This file is part of Matrix Calculator. * * Matrix Calculator 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 3 of the License, or * (at your option) any later version. * * Matrix Calculator 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. * * You should have received a copy of the GNU General Public License * along with Matrix Calculator. If not, see <http://www.gnu.org/licenses/>. * */ package com.softminds.matrixcalculator.base_fragments; import android.os.Bundle; import android.support.v4.app.ListFragment; import android.util.Log; import android.view.View; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import com.softminds.matrixcalculator.MatrixV2; import com.softminds.matrixcalculator.MatrixAdapter; import com.softminds.matrixcalculator.R; import com.softminds.matrixcalculator.GlobalValues; @SuppressWarnings("ConstantConditions") public class VariableListSub extends ListFragment { MatrixAdapter adapter; int Row; int Col; int ClickNo; @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); adapter = new MatrixAdapter(getContext(), R.layout.list_layout_fragment, ((GlobalValues) getActivity().getApplication()).GetCompleteList()); getListView().setDividerHeight(1); setListAdapter(adapter); } @Override public void onListItemClick(ListView l, View v, int position, long id) { super.onListItemClick(l, v, position, id); MatrixV2 m = ((GlobalValues) getActivity().getApplication()).GetCompleteList().get(position); if (ClickNo == 0) { Row = m.getNumberOfRows(); Col = m.getNumberOfCols(); AddToQueue(m); ClickNo++; } else { if (m.getNumberOfRows() == Row && m.getNumberOfCols() == Col) { AddToQueue(m); } else { Toast.makeText(getContext(), "You can only select " + String.valueOf(Row) + " x " + String.valueOf(Col) + " MatrixV2 ", Toast.LENGTH_SHORT).show(); } } } private void AddToQueue(MatrixV2 click) { try { @SuppressWarnings("ConstantConditions") //to suppress the null pointer exception of the textview TextView textView = getParentFragment().getView().findViewById(R.id.AdditionStatus); String Initial = textView.getText().toString(); if (Initial.isEmpty()) { textView.setText(click.getName()); ((GlobalValues) getActivity().getApplication()).MatrixQueue.add(click); } else { String Complete = Initial + " - " + click.getName(); textView.setText(Complete); ((GlobalValues) getActivity().getApplication()).MatrixQueue.add(click); } } catch (NullPointerException e) { Log.d("AddToQueue", "Exception raised, cannot get textview from parent fragment"); e.printStackTrace(); } } public void UpdateInfo() { ClickNo = 0; } }