Java tutorial
/* Copyright 2016 Iskander Gaba 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.gaba.alex.trafficincidents; import android.accounts.Account; import android.accounts.AccountManager; import android.app.Dialog; import android.content.ContentResolver; import android.content.DialogInterface; import android.content.Intent; import android.content.OperationApplicationException; import android.content.SharedPreferences; import android.os.Bundle; import android.os.RemoteException; import android.preference.PreferenceManager; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.TextView; import com.gaba.alex.trafficincidents.Data.IncidentsProvider; import com.google.android.gms.common.ConnectionResult; import com.google.android.gms.common.GoogleApiAvailability; import com.google.android.gms.common.GooglePlayServicesNotAvailableException; import com.google.android.gms.common.GooglePlayServicesRepairableException; import com.google.android.gms.location.places.Place; import com.google.android.gms.location.places.ui.PlacePicker; import com.google.android.gms.maps.model.LatLng; import com.google.android.gms.maps.model.LatLngBounds; import com.melnykov.fab.FloatingActionButton; public class MainActivity extends AppCompatActivity { private Intent mPlacePickerIntent; private static final int PLAY_SERVICES_RESOLUTION_REQUEST = 9000; private final int PLACE_PICKER_REQUEST = 1; private final String PREF_LAT = "lat"; private final String PREF_LNG = "lng"; private final String PREF_ADDRESS = "address"; private String mAccountName; private String mAccountType; final String AUTHORITY = IncidentsProvider.AUTHORITY; private static final long SECONDS_PER_HOUR = 3600L; private SharedPreferences.OnSharedPreferenceChangeListener mPreferencesListener; Account mAccount; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final SwipeRefreshLayout swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout); swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { refresh(); swipeRefreshLayout.setRefreshing(false); } }); mAccountName = getString(R.string.app_name); mAccountType = getString(R.string.account_type); checkGooglePlayServices(); try { Utility.updateSettings(getApplicationContext()); } catch (RemoteException | OperationApplicationException e) { e.printStackTrace(); } mAccount = createSyncAccount(); final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this); mPreferencesListener = new SharedPreferences.OnSharedPreferenceChangeListener() { public void onSharedPreferenceChanged(SharedPreferences prefs, String key) { if (key.equals(PREF_LAT) || key.equals(PREF_LNG)) { try { Utility.updateSettings(getApplicationContext()); } catch (RemoteException | OperationApplicationException e) { e.printStackTrace(); } } else if (key.equals(getString(R.string.pref_auto_refresh_key))) { configurePeriodicSync(mAccount); } } }; preferences.registerOnSharedPreferenceChangeListener(mPreferencesListener); PlacePicker.IntentBuilder builder = new PlacePicker.IntentBuilder(); if (preferences.contains(PREF_LAT) && preferences.contains(PREF_LNG)) { double lat = Double.parseDouble(preferences.getString(PREF_LAT, "0")); double lng = Double.parseDouble(preferences.getString(PREF_LNG, "0")); builder.setLatLngBounds(new LatLngBounds(new LatLng(lat, lng), new LatLng(lat, lng))); } configurePeriodicSync(mAccount); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); String address = preferences.getString(PREF_ADDRESS, getString(R.string.select_location)); TextView addressTextView = (TextView) findViewById(R.id.address); addressTextView.setText(address); try { mPlacePickerIntent = builder.build(this); } catch (GooglePlayServicesNotAvailableException | GooglePlayServicesRepairableException e) { e.printStackTrace(); } FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); fab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { startActivityForResult(mPlacePickerIntent, PLACE_PICKER_REQUEST); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); switch (id) { case R.id.action_settings: startActivity(new Intent(this, SettingsActivity.class)); return true; case R.id.action_about: startActivity(new Intent(this, AboutActivity.class)); return true; } return super.onOptionsItemSelected(item); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == PLACE_PICKER_REQUEST) { SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this); if (resultCode == RESULT_OK) { Place selectedPlace = PlacePicker.getPlace(this, data); double newLat = selectedPlace.getLatLng().latitude; double newLng = selectedPlace.getLatLng().longitude; double lat = Double.parseDouble(preferences.getString(PREF_LAT, "0")); double lng = Double.parseDouble(preferences.getString(PREF_LNG, "0")); if (newLat != lat || newLng != lng) { SharedPreferences.Editor editor = preferences.edit(); editor.putString(PREF_LAT, newLat + ""); editor.putString(PREF_LNG, newLng + ""); editor.putString(PREF_ADDRESS, selectedPlace.getAddress().toString()); editor.apply(); PlacePicker.IntentBuilder builder = new PlacePicker.IntentBuilder(); String address = preferences.getString(PREF_ADDRESS, getString(R.string.select_location)); TextView addressTextView = (TextView) findViewById(R.id.address); addressTextView.setText(address); builder.setLatLngBounds( new LatLngBounds(new LatLng(newLat, newLng), new LatLng(newLat, newLng))); try { mPlacePickerIntent = builder.build(this); } catch (GooglePlayServicesRepairableException | GooglePlayServicesNotAvailableException e) { e.printStackTrace(); } refresh(); } } } } @Override protected void onDestroy() { SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this); preferences.unregisterOnSharedPreferenceChangeListener(mPreferencesListener); super.onDestroy(); } private boolean checkGooglePlayServices() { GoogleApiAvailability apiAvailability = GoogleApiAvailability.getInstance(); final int resultCode = apiAvailability.isGooglePlayServicesAvailable(this); if (resultCode != ConnectionResult.SUCCESS) { if (apiAvailability.isUserResolvableError(resultCode)) { Dialog dialog = apiAvailability.getErrorDialog(this, resultCode, PLAY_SERVICES_RESOLUTION_REQUEST); if (dialog != null) { dialog.show(); dialog.setOnDismissListener(new DialogInterface.OnDismissListener() { public void onDismiss(DialogInterface dialog) { if (ConnectionResult.SERVICE_INVALID == resultCode) { finish(); } } }); } } return false; } return true; } private Account createSyncAccount() { Account appAccount = new Account(mAccountName, mAccountType); AccountManager accountManager = AccountManager.get(this); if (accountManager.addAccountExplicitly(appAccount, null, null)) { ContentResolver.setMasterSyncAutomatically(true); ContentResolver.setSyncAutomatically(appAccount, AUTHORITY, true); } return appAccount; } private void refresh() { Bundle settingsBundle = new Bundle(); settingsBundle.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true); settingsBundle.putBoolean(ContentResolver.SYNC_EXTRAS_EXPEDITED, true); ContentResolver.requestSync(mAccount, AUTHORITY, settingsBundle); } private void configurePeriodicSync(Account appAccount) { SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this); int hourlySyncInterval = Integer .parseInt(preferences.getString(getString(R.string.pref_auto_refresh_key), "6")); if (hourlySyncInterval == 0) { ContentResolver.setSyncAutomatically(appAccount, AUTHORITY, false); } else { long syncInterval = hourlySyncInterval * SECONDS_PER_HOUR; ContentResolver.setSyncAutomatically(appAccount, AUTHORITY, true); ContentResolver.addPeriodicSync(appAccount, AUTHORITY, Bundle.EMPTY, syncInterval); } } }