Java tutorial
/* * Copyright (C) 2016 Ferid Cafer * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.ferid.app.classroom.edit; import android.content.Context; import android.content.Intent; import android.os.AsyncTask; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.text.TextUtils; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.inputmethod.InputMethodManager; import android.widget.TextView; import com.ferid.app.classroom.R; import com.ferid.app.classroom.adapters.EditClassroomsAdapter; import com.ferid.app.classroom.database.DatabaseManager; import com.ferid.app.classroom.enums.ClassroomPopup; import com.ferid.app.classroom.listeners.AdapterClickListener; import com.ferid.app.classroom.listeners.OnAlertClick; import com.ferid.app.classroom.listeners.PopupClickListener; import com.ferid.app.classroom.listeners.PromptListener; import com.ferid.app.classroom.material_dialog.CustomAlertDialog; import com.ferid.app.classroom.material_dialog.PromptDialog; import com.ferid.app.classroom.model.Classroom; import java.util.ArrayList; /** * Created by ferid.cafer on 4/15/2015.<br /> * Adds and removes classes. */ public class EditClassroomFragment extends Fragment { private Context context; private SwipeRefreshLayout swipeRefreshLayout; private RecyclerView list; private ArrayList<Classroom> arrayList = new ArrayList<>(); private EditClassroomsAdapter adapter; private TextView emptyText; //empty list view text public EditClassroomFragment() { } public static EditClassroomFragment newInstance() { EditClassroomFragment editClassroomFragment = new EditClassroomFragment(); return editClassroomFragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // retain this fragment setRetainInstance(true); } @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.refreshable_list, container, false); context = rootView.getContext(); list = (RecyclerView) rootView.findViewById(R.id.list); adapter = new EditClassroomsAdapter(context, arrayList); list.setAdapter(adapter); list.setLayoutManager(new LinearLayoutManager(context)); list.setHasFixedSize(true); emptyText = (TextView) rootView.findViewById(R.id.emptyText); swipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.swipeRefreshLayout); swipeRefreshLayout.setColorSchemeResources(android.R.color.holo_blue_bright, android.R.color.holo_green_light, android.R.color.holo_orange_light, android.R.color.holo_red_light); swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { new SelectClassrooms().execute(); } }); addAdapterClickListener(); addPopupClickListener(); new SelectClassrooms().execute(); return rootView; } /** * Set empty list text */ private void setEmptyText() { if (emptyText != null) { if (arrayList.isEmpty()) { emptyText.setVisibility(View.VISIBLE); } else { emptyText.setVisibility(View.GONE); } } } /** * Check if the given classroom name already exists * @param classroomName Selected classroom * @return */ private boolean isAlreadyExist(String classroomName) { boolean isAlreadyExist = false; for (Classroom classroom : arrayList) { if (classroom.getName().equals(classroomName)) { isAlreadyExist = true; break; } } return isAlreadyExist; } /** * Add new class item */ public void addClassroom() { final PromptDialog promptDialog = new PromptDialog(context); promptDialog.setPositiveButton(getString(R.string.ok)); promptDialog.setAllCaps(); promptDialog.setAlphanumeric(); promptDialog.setOnPositiveClickListener(new PromptListener() { @Override public void OnPrompt(String promptText) { closeKeyboard(); promptDialog.dismiss(); if (!TextUtils.isEmpty(promptText)) { if (!isAlreadyExist(promptText)) { new InsertClassroom().execute(promptText); } else { //alert CustomAlertDialog customAlertDialog = new CustomAlertDialog(context); customAlertDialog.setMessage(getString(R.string.couldNotInsertClassroom)); customAlertDialog.setPositiveButtonText(getString(R.string.ok)); customAlertDialog.showDialog(); } } } }); promptDialog.show(); } /** * Change the selected class name * @param classroomId current classroom to be changed * @param content current name of the classroom */ public void editClassroom(final int classroomId, String content) { final PromptDialog promptDialog = new PromptDialog(context); promptDialog.setContent(content); promptDialog.setPositiveButton(getString(R.string.ok)); promptDialog.setAllCaps(); promptDialog.setAlphanumeric(); promptDialog.setOnPositiveClickListener(new PromptListener() { @Override public void OnPrompt(String promptText) { closeKeyboard(); promptDialog.dismiss(); if (!TextUtils.isEmpty(promptText)) { new UpdateClassroom().execute(String.valueOf(classroomId), promptText); } } }); promptDialog.show(); } /** * Delete classroom * @param classroom Selected classroom */ private void deleteClassroom(final Classroom classroom) { //show alert before deleting CustomAlertDialog customAlertDialog = new CustomAlertDialog(context); customAlertDialog.setMessage(classroom.getName() + getString(R.string.sureToDelete)); customAlertDialog.setPositiveButtonText(getString(R.string.delete)); customAlertDialog.setNegativeButtonText(getString(R.string.cancel)); customAlertDialog.setOnClickListener(new OnAlertClick() { @Override public void OnPositive() { new DeleteClassroom().execute(classroom.getId()); } @Override public void OnNegative() { //do nothing } }); customAlertDialog.showDialog(); } /** * Go inside classroom to add, change or delete students * @param classroom */ private void showStudents(Classroom classroom) { Intent intent = new Intent(context, EditStudentActivity.class); intent.putExtra("classroom", classroom); startActivity(intent); getActivity().overridePendingTransition(R.anim.move_in_from_bottom, R.anim.stand_still); } /** * List item click event */ private void addAdapterClickListener() { adapter.setAdapterClickListener(new AdapterClickListener() { @Override public void OnItemClick(int position) { if (arrayList != null && arrayList.size() > position) { showStudents(arrayList.get(position)); } } }); } /** * Pop-up menu item click event */ public void addPopupClickListener() { adapter.setPopupClickListener(new PopupClickListener() { @Override public void OnPopupClick(int itemPosition, int menuPosition) { if (arrayList != null && arrayList.size() > itemPosition) { Classroom classroom = arrayList.get(itemPosition); if (menuPosition == ClassroomPopup.CHANGE_NAME.getValue()) { editClassroom(classroom.getId(), classroom.getName()); } else if (menuPosition == ClassroomPopup.DELETE_CLASSROOM.getValue()) { deleteClassroom(classroom); } } } }); } /** * Select classrooms from DB */ private class SelectClassrooms extends AsyncTask<Void, Void, ArrayList<Classroom>> { @Override protected void onPreExecute() { swipeRefreshLayout.setRefreshing(true); } @Override protected ArrayList<Classroom> doInBackground(Void... params) { DatabaseManager databaseManager = new DatabaseManager(context); ArrayList<Classroom> tmpList = databaseManager.selectClassrooms(); return tmpList; } @Override protected void onPostExecute(ArrayList<Classroom> tmpList) { swipeRefreshLayout.setRefreshing(false); arrayList.clear(); if (tmpList != null) { arrayList.addAll(tmpList); adapter.notifyDataSetChanged(); setEmptyText(); } } } /** * Insert classroom name into DB */ private class InsertClassroom extends AsyncTask<String, Void, Boolean> { @Override protected Boolean doInBackground(String... params) { String classroom = params[0]; DatabaseManager databaseManager = new DatabaseManager(context); boolean isSuccessful = databaseManager.insertClassroom(classroom); return isSuccessful; } @Override protected void onPostExecute(Boolean isSuccessful) { if (isSuccessful) { new SelectClassrooms().execute(); } } } /** * Update classroom name in the DB */ private class UpdateClassroom extends AsyncTask<String, Void, Boolean> { @Override protected Boolean doInBackground(String... params) { String classroomId = params[0]; String newName = params[1]; DatabaseManager databaseManager = new DatabaseManager(context); boolean isSuccessful = databaseManager.updateClassroomName(classroomId, newName); return isSuccessful; } @Override protected void onPostExecute(Boolean isSuccessful) { if (isSuccessful) { new SelectClassrooms().execute(); } } } /** * Delete a classroom item from DB */ private class DeleteClassroom extends AsyncTask<Integer, Void, Boolean> { @Override protected Boolean doInBackground(Integer... params) { int classroomId = params[0]; DatabaseManager databaseManager = new DatabaseManager(context); boolean isSuccessful = databaseManager.deleteClassroom(classroomId); return isSuccessful; } @Override protected void onPostExecute(Boolean isSuccessful) { if (isSuccessful) { new SelectClassrooms().execute(); } } } /** * Closes keyboard for disabling interruption */ private void closeKeyboard() { try { InputMethodManager imm = (InputMethodManager) getActivity() .getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(getActivity().getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS); } catch (Exception ignored) { } } }