Java tutorial
/* * Copyright (c) 2016. * * This file is part of the Code Cyprus App. * * The Code Cyprus App 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. * * Code Cyprus App 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 Code Cyprus App. If not, see <http://www.gnu.org/licenses/>. */ package org.codecyprus.android_client.ui; import android.app.ActionBar; import android.app.Activity; import android.content.*; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.text.Html; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.Window; import android.view.inputmethod.InputMethodManager; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; import org.codecyprus.android_client.Preferences; import org.codecyprus.android_client.R; import org.codecyprus.android_client.SerializableSession; import org.codecyprus.android_client.model.Answer; import org.codecyprus.android_client.model.Question; import org.codecyprus.android_client.sync.JsonParseException; import org.codecyprus.android_client.sync.JsonParser; import org.codecyprus.android_client.sync.SyncService; import org.json.JSONException; import java.util.*; import static org.codecyprus.android_client.model.Answer.*; /** * @author Nearchos Paspallis * 27/12/13 / 15:59. */ public class ActivityCurrentQuestion extends Activity { public static final String TAG = "codecyprus"; private static final IntentFilter intentFilter = new IntentFilter(); static { intentFilter.addAction(SyncService.ACTION_CURRENT_QUESTION_COMPLETED); intentFilter.addAction(SyncService.ACTION_ANSWER_QUESTION_COMPLETED); intentFilter.addAction(SyncService.ACTION_SKIP_QUESTION_COMPLETED); intentFilter.addAction(SyncService.ACTION_SCORE_COMPLETED); } private ProgressReceiver progressReceiver; private ActionBar actionBar; private Button buttonA; private Button buttonB; private Button buttonC; private Button buttonD; private Button buttonSubmit; // private TextView scoreTextView; private TextView feedbackTextView; private TextView questionTextView; private TextView requiresLocationTextView; private View mcqButtonsContainer; private View textButtonsContainer; private EditText textAnswerEditText; private Question question = null; private InputMethodManager inputMethodManager; private LocationManager locationManager; private LocationUpdater locationUpdater; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); setContentView(R.layout.activity_current_question); actionBar = getActionBar(); inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); locationUpdater = new LocationUpdater(); // scoreTextView = (TextView) findViewById(R.id.activity_current_question_score); feedbackTextView = (TextView) findViewById(R.id.activity_current_question_feedback); feedbackTextView.setVisibility(View.GONE); questionTextView = (TextView) findViewById(R.id.activity_current_question_question); requiresLocationTextView = (TextView) findViewById(R.id.activity_current_question_requires_location); requiresLocationTextView.setVisibility(View.GONE); mcqButtonsContainer = findViewById(R.id.activity_current_question_mcq_buttons); textButtonsContainer = findViewById(R.id.activity_current_question_text_buttons); textAnswerEditText = (EditText) findViewById(R.id.activity_current_question_edit_text); buttonA = (Button) findViewById(R.id.activity_current_question_button_A); buttonA.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { submitAnswer("A"); } }); buttonB = (Button) findViewById(R.id.activity_current_question_button_B); buttonB.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { submitAnswer("B"); } }); buttonC = (Button) findViewById(R.id.activity_current_question_button_C); buttonC.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { submitAnswer("C"); } }); buttonD = (Button) findViewById(R.id.activity_current_question_button_D); buttonD.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { submitAnswer("D"); } }); buttonSubmit = (Button) findViewById(R.id.activity_current_question_button_submit); buttonSubmit.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { final CharSequence charSequence = textAnswerEditText.getText(); final String answer = charSequence == null ? "" : charSequence.toString(); if (answer.isEmpty()) { Toast.makeText(ActivityCurrentQuestion.this, R.string.Invalid_empty_answer, Toast.LENGTH_SHORT) .show(); } else { inputMethodManager.hideSoftInputFromWindow(textAnswerEditText.getWindowToken(), 0); submitAnswer(answer); } } }); progressReceiver = new ProgressReceiver(); } // private MenuItem locationMenuItem = null; todo delete? @Override public boolean onCreateOptionsMenu(Menu menu) { menu.add(R.string.SKIP) .setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW); menu.add(R.string.Score_board) .setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == android.R.id.home) { finish(); return true; } else if (getString(R.string.SKIP).equals(item.getTitle())) { final DialogSkip dialogSkip = new DialogSkip(this); dialogSkip.setOnDismissListener(new DialogInterface.OnDismissListener() { @Override public void onDismiss(DialogInterface dialog) { if (dialogSkip.isSkip()) { skipQuestion(); } } }); dialogSkip.show(); return true; } else if (getString(R.string.Score_board).equals(item.getTitle())) { showScoreBoard(); return true; } else { return super.onOptionsItemSelected(item); } } private void skipQuestion() { final Intent skipQuestionIntent = new Intent(this, SyncService.class); skipQuestionIntent.setAction(SyncService.ACTION_SKIP_QUESTION); final HashMap<String, String> parameters = new HashMap<>(); parameters.put("session", sessionUUID); skipQuestionIntent.putExtra(SyncService.EXTRA_PARAMETERS, parameters); setProgressBarIndeterminateVisibility(true); startService(skipQuestionIntent); } private String sessionUUID = null; // private String locationUUID = null; @Override protected void onResume() { super.onResume(); registerReceiver(progressReceiver, intentFilter); if (actionBar != null) actionBar.setDisplayHomeAsUpEnabled(true); mcqButtonsContainer.setVisibility(View.GONE); textButtonsContainer.setVisibility(View.GONE); final SerializableSession serializableSession = Preferences.getActiveSession(this); if (serializableSession == null) { Toast.makeText(this, R.string.Invalid_session, Toast.LENGTH_SHORT).show(); finish(); } else { sessionUUID = serializableSession.getSessionUUID(); requestCurrentQuestion(); // locationUUID = serializableSession.getLocationUUID(); // request normal (i.e. android-based) location updates locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 30000, 0, locationUpdater); locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 30000, 0, locationUpdater); } } @Override protected void onPause() { super.onPause(); unregisterReceiver(progressReceiver); locationManager.removeUpdates(locationUpdater); } private void requestCurrentQuestion() { final Intent currentQuestionIntent = new Intent(this, SyncService.class); currentQuestionIntent.setAction(SyncService.ACTION_CURRENT_QUESTION); final HashMap<String, String> parameters = new HashMap<>(); parameters.put("session", sessionUUID); // todo add code currentQuestionIntent.putExtra(SyncService.EXTRA_PARAMETERS, parameters); setProgressBarIndeterminateVisibility(true); startService(currentQuestionIntent); requestScore(); } private void requestScore() { final Intent scoreIntent = new Intent(this, SyncService.class); scoreIntent.setAction(SyncService.ACTION_SCORE); final HashMap<String, String> parameters = new HashMap<>(); parameters.put("session", sessionUUID); scoreIntent.putExtra(SyncService.EXTRA_PARAMETERS, parameters); setProgressBarIndeterminateVisibility(true); startService(scoreIntent); } private void submitAnswer(final String answer) { // upload answer directly uploadAnswer(answer); } private void uploadAnswer(final String answer) { buttonA.setEnabled(false); buttonB.setEnabled(false); buttonC.setEnabled(false); buttonD.setEnabled(false); buttonSubmit.setEnabled(false); final Intent answerQuestionIntent = new Intent(this, SyncService.class); answerQuestionIntent.setAction(SyncService.ACTION_ANSWER_QUESTION); final HashMap<String, String> parameters = new HashMap<>(); parameters.put("session", sessionUUID); parameters.put("answer", answer.trim()); answerQuestionIntent.putExtra(SyncService.EXTRA_PARAMETERS, parameters); setProgressBarIndeterminateVisibility(true); startService(answerQuestionIntent); } private class ProgressReceiver extends BroadcastReceiver { @Override public void onReceive(final Context context, final Intent intent) { final String payload = (String) intent.getSerializableExtra(SyncService.EXTRA_PAYLOAD); setProgressBarIndeterminateVisibility(false); if (payload != null) { Log.d(TAG, "intent.getAction() -> " + intent.getAction()); try { if (SyncService.ACTION_CURRENT_QUESTION_COMPLETED.equals(intent.getAction())) { question = JsonParser.parseCurrentQuestion(payload); } else if (SyncService.ACTION_ANSWER_QUESTION_COMPLETED.equals(intent.getAction())) { feedbackTextView.setVisibility(View.VISIBLE); final Answer answer = JsonParser.parseAnswerQuestion(payload); if (answer == INCORRECT) { feedbackTextView.setTextColor(getResources().getColor(R.color.red)); feedbackTextView.setText(getString(R.string.Incorrect)); Toast.makeText(context, R.string.Incorrect, Toast.LENGTH_SHORT).show(); requestScore(); } else if (answer == UNKNOWN_OR_INCORRECT_LOCATION) { feedbackTextView.setTextColor(getResources().getColor(R.color.red)); feedbackTextView.setText(getString(R.string.Unknown_or_incorrect_location)); Toast.makeText(context, R.string.Unknown_or_incorrect_location, Toast.LENGTH_SHORT) .show(); requestScore(); } else if (answer == CORRECT_UNFINISHED) { feedbackTextView.setTextColor(getResources().getColor(R.color.green)); feedbackTextView.setText(getString(R.string.Correct)); Toast.makeText(context, R.string.Correct, Toast.LENGTH_SHORT).show(); requestCurrentQuestion(); } else if (answer == CORRECT_FINISHED) { feedbackTextView.setTextColor(getResources().getColor(R.color.green)); feedbackTextView.setText(getString(R.string.Correct_finished)); Toast.makeText(context, R.string.Correct_finished, Toast.LENGTH_SHORT).show(); // remove from saved sessions in prefs Preferences.clearActiveSession(context); showScoreBoard(); // remove this activity from call stack finish(); } } else if (SyncService.ACTION_SKIP_QUESTION_COMPLETED.equals(intent.getAction())) { boolean hasMoreQuestions = JsonParser.parseSkipQuestion(payload); if (hasMoreQuestions) { Toast.makeText(context, R.string.Skipped_has_more_questions, Toast.LENGTH_SHORT).show(); feedbackTextView.setVisibility(View.GONE); requestCurrentQuestion(); } else { Toast.makeText(context, R.string.Skipped_finished, Toast.LENGTH_SHORT).show(); // remove from saved sessions in prefs Preferences.clearActiveSession(context); showScoreBoard(); // remove this activity from call stack finish(); } } else if (SyncService.ACTION_SCORE_COMPLETED.equals(intent.getAction())) { final int score = JsonParser.parseScore(payload); // scoreTextView.setText(getString(R.string.Score_is, score)); setTitle(getString(R.string.Score, score)); } else if (SyncService.ACTION_UPDATE_LOCATION_COMPLETED.equals(intent.getAction())) { // no need to do anything really, except show an error if any (will be handled via the try-catch block) JsonParser.parseUpdateLocation(payload); } // update the UI updateUI(); } catch (JsonParseException jsonpe) { Log.e(TAG, jsonpe.getMessage()); new DialogError(context, jsonpe.getMessage()).show(); } catch (JSONException jsone) { Log.e(TAG, jsone.getMessage()); } } } } private void updateUI() { buttonA.setEnabled(true); buttonB.setEnabled(true); buttonC.setEnabled(true); buttonD.setEnabled(true); buttonSubmit.setEnabled(true); assert question != null; String questionText = question.getQuestion(); if (questionText.startsWith("MCQ:")) { questionText = questionText.substring(4).trim(); mcqButtonsContainer.setVisibility(View.VISIBLE); textButtonsContainer.setVisibility(View.GONE); inputMethodManager.hideSoftInputFromWindow(textAnswerEditText.getWindowToken(), 0); } else { mcqButtonsContainer.setVisibility(View.GONE); textButtonsContainer.setVisibility(View.VISIBLE); textAnswerEditText.selectAll(); textAnswerEditText.requestFocus(); inputMethodManager.showSoftInput(textAnswerEditText, 0); } questionTextView.setText(Html.fromHtml(questionText)); requiresLocationTextView.setVisibility(question.isLocationRelevant() ? View.VISIBLE : View.GONE); } private void showScoreBoard() { final Intent startActivityScoreBoardIntent = new Intent(this, ActivityScoreBoard.class); startActivityScoreBoardIntent.putExtra("session", sessionUUID); startActivity(startActivityScoreBoardIntent); } private void updateLocation(final double lat, final double lng) { final Intent updateLocationIntent = new Intent(ActivityCurrentQuestion.this, SyncService.class); updateLocationIntent.setAction(SyncService.ACTION_UPDATE_LOCATION); final HashMap<String, String> parameters = new HashMap<>(); parameters.put("session", sessionUUID); parameters.put("lat", Double.toString(lat)); parameters.put("lng", Double.toString(lng)); updateLocationIntent.putExtra(SyncService.EXTRA_PARAMETERS, parameters); startService(updateLocationIntent); } private class LocationUpdater implements LocationListener { @Override public void onLocationChanged(Location location) { final double lat = location.getLatitude(); final double lng = location.getLongitude(); Log.d(TAG, "location: " + lat + ", " + lng); // call sync service to update location updateLocation(lat, lng); } @Override public void onStatusChanged(String provider, int status, Bundle extras) { Log.d(TAG, "onStatusChanged: " + provider + ", status: " + status); } @Override public void onProviderEnabled(String provider) { Log.d(TAG, "onProviderEnabled: " + provider); } @Override public void onProviderDisabled(String provider) { Log.d(TAG, "onProviderDisabled: " + provider); } } }