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.OperationFragments; import android.app.AlertDialog; import android.app.ProgressDialog; import android.content.DialogInterface; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.preference.PreferenceManager; import android.support.v4.app.ListFragment; import android.view.View; import android.widget.ListView; import android.widget.Toast; import com.softminds.matrixcalculator.GlobalValues; import com.softminds.matrixcalculator.MatrixV2; import com.softminds.matrixcalculator.MatrixAdapter; import com.softminds.matrixcalculator.R; import com.softminds.matrixcalculator.base_activities.ShowResult; import java.lang.ref.WeakReference; import java.util.ArrayList; @SuppressWarnings("ConstantConditions") public class InverseFragment extends ListFragment { final String KEY = "DETERMINANT_FOR_INVERSE"; boolean ENABLED_NO_DECIMAL; ArrayList<MatrixV2> SquareList; ProgressDialog progress; private static class MyHandler extends Handler { private final WeakReference<InverseFragment> weakReference; MyHandler(InverseFragment inverseFragment) { weakReference = new WeakReference<>(inverseFragment); } @Override public void handleMessage(Message message) { if (weakReference.get().progress.isShowing()) { Intent intent = new Intent(weakReference.get().getActivity(), ShowResult.class); if (message.getData().getFloat("DETERMINANT", 0) == 0) { intent.putExtras(message.getData()); weakReference.get().progress.dismiss(); weakReference.get().startActivity(intent); } else { intent.putExtras(message.getData()); intent.putExtra(weakReference.get().KEY, message.getData().getFloat("DETERMINANT", 0)); weakReference.get().progress.dismiss(); weakReference.get().startActivity(intent); } } } } MyHandler myHandler = new MyHandler(this); @Override public void onActivityCreated(Bundle savedInstances) { super.onActivityCreated(savedInstances); SquareList = new ArrayList<>(); for (int i = 0; i < ((GlobalValues) getActivity().getApplication()).GetCompleteList().size(); i++) { if (((GlobalValues) getActivity().getApplication()).GetCompleteList().get(i).isSquareMatrix()) SquareList.add(((GlobalValues) getActivity().getApplication()).GetCompleteList().get(i)); } MatrixAdapter MatriXadapter = new MatrixAdapter(getActivity(), R.layout.list_layout_fragment, SquareList); getListView().setDividerHeight(1); setListAdapter(MatriXadapter); SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getContext()); ENABLED_NO_DECIMAL = preferences.getBoolean("NO_FRACTION_ENABLED", false); } @Override public void onListItemClick(ListView L, View V, int position, long id) { ProgressDialog progressDialog = new ProgressDialog(getContext()); progressDialog.setMessage(getString(R.string.Calculating)); progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); progressDialog.setIndeterminate(false); progressDialog.setCanceledOnTouchOutside(false); progressDialog.show(); progress = progressDialog; if (SquareList.get(position).getJamaMatrix().det() != 0) { if (ENABLED_NO_DECIMAL) RunAndGetDeterminantWithAdjoint(position, progressDialog); else RunNewGetInverse(position, progressDialog); } else { new AlertDialog.Builder(getContext()) .setMessage("The Determinant of the matrix was Zero and Hence its Inverse does not exist") .setTitle("No Inverse Exist") .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialogInterface, int i) { dialogInterface.dismiss(); } }).show(); progressDialog.dismiss(); } } public void RunNewGetInverse(final int pos, final ProgressDialog pq) { Runnable runnable = new Runnable() { @Override public void run() { MatrixV2 res = SquareList.get(pos).getInverse(pq); Message message = new Message(); if (res != null) { message.setData(res.getDataBundled()); myHandler.sendMessage(message); } else { myHandler.postDelayed(new Runnable() { @Override public void run() { Toast.makeText(getContext(), R.string.NoInverse, Toast.LENGTH_SHORT).show(); } }, 0); pq.dismiss(); } } }; Thread thread = new Thread(runnable); thread.start(); } public void RunAndGetDeterminantWithAdjoint(final int i, final ProgressDialog progressDialog) { Runnable runnable = new Runnable() { @Override public void run() { Message message = new Message(); Bundle bundle = new Bundle(); float detr = (float) SquareList.get(i).getDeterminant(progressDialog); if (detr == 0.0f) { myHandler.postDelayed(new Runnable() { @Override public void run() { Toast.makeText(getContext(), R.string.NoInverse, Toast.LENGTH_SHORT).show(); } }, 0); progressDialog.dismiss(); } else { progressDialog.setProgress(0); bundle.putFloat("DETERMINANT", detr); MatrixV2 res = SquareList.get(i).getAdjoint(progressDialog); bundle.putAll(res.getDataBundled()); message.setData(bundle); myHandler.sendMessage(message); } } }; Thread thread = new Thread(runnable); thread.start(); } }