Java tutorial
/* * Copyright (C) 2014 The Android Open Source Project * * 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.fpil.android.remotesensor; import android.Manifest; import android.app.ActionBar; import android.app.Activity; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.location.Criteria; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.provider.Settings; import android.support.annotation.Nullable; import android.support.design.widget.FloatingActionButton; import android.support.v4.app.ActivityCompat; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v7.widget.RecyclerView; import android.telephony.TelephonyManager; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.view.inputmethod.EditorInfo; import android.widget.TextView; import android.widget.Toast; import com.fpil.android.common.logger.Log; import java.util.ArrayList; import java.util.Date; /** * This fragment controls Bluetooth to communicate with other devices. */ public class MainDisplay extends Fragment { private static final String TAG = "BluetoothChatFragment"; // Intent request codes private static final int REQUEST_CONNECT_DEVICE_SECURE = 1; private static final int REQUEST_CONNECT_DEVICE_INSECURE = 2; private static final int REQUEST_ENABLE_BT = 3; // Layout Views // private ListView mConversationView; // private EditText mOutEditText; // private Button mSendButton; private FloatingActionButton mNewButton; /** * Name of the connected device */ private String mConnectedDeviceName = null; /** * Array adapter for the conversation thread */ // private ArrayAdapter<String> mConversationArrayAdapter; /** * String buffer for outgoing messages */ private StringBuffer mOutStringBuffer; /** * Local Bluetooth adapter */ private BluetoothAdapter mBluetoothAdapter = null; /** * Member object for the chat services */ private BluetoothTalkService mChatService = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); // Get local Bluetooth adapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); mNewButton = (FloatingActionButton) getActivity().findViewById(R.id.new_measure); // If the adapter is null, then Bluetooth is not supported if (mBluetoothAdapter == null) { FragmentActivity activity = getActivity(); Toast.makeText(activity, "Bluetooth is not available", Toast.LENGTH_LONG).show(); mNewButton.hide(); // activity.finish(); } } @Override public void onStart() { super.onStart(); // If BT is not on, request that it be enabled. // setupChat() will then be called during onActivityResult if (!mBluetoothAdapter.isEnabled()) { Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableIntent, REQUEST_ENABLE_BT); // Otherwise, setup the chat session } else if (mChatService == null) { setupChat(); } } @Override public void onDestroy() { super.onDestroy(); if (mChatService != null) { mChatService.stop(); } } @Override public void onResume() { super.onResume(); // Performing this check in onResume() covers the case in which BT was // not enabled during onStart(), so we were paused to enable it... // onResume() will be called when ACTION_REQUEST_ENABLE activity returns. if (mChatService != null) { // Only if the state is STATE_NONE, do we know that we haven't started already if (mChatService.getState() == BluetoothTalkService.STATE_NONE) { // Start the Bluetooth chat services mChatService.start(); } } } @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_bluetooth_chat, container, false); } LocationManager locationManager; String locationProviderName; @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE); Criteria locationCriteria = new Criteria(); locationCriteria.setAccuracy(Criteria.ACCURACY_FINE); locationCriteria.setAltitudeRequired(false); locationCriteria.setBearingRequired(false); locationCriteria.setCostAllowed(true); locationCriteria.setPowerRequirement(Criteria.NO_REQUIREMENT); locationProviderName = locationManager.getBestProvider(locationCriteria, true); if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { Toast.makeText(getActivity(), R.string.turn_on_gps, Toast.LENGTH_LONG).show(); Intent myIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); this.startActivity(myIntent); } if (locationProviderName != null && locationManager.isProviderEnabled(locationProviderName)) { // Provider is enabled Toast.makeText(getActivity(), R.string.gps_available, Toast.LENGTH_LONG).show(); } else { // Provider not enabled, prompt user to enable it Toast.makeText(getActivity(), R.string.turn_on_gps, Toast.LENGTH_LONG).show(); Intent myIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); this.startActivity(myIntent); } } RecyclerView cards; @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); mNewButton = (FloatingActionButton) view.findViewById(R.id.new_measure); cards = (RecyclerView) getActivity().findViewById(R.id.recyclerview); } Talker myTalker; long currentKey; /** * Set up the UI and background operations for chat. */ private void setupChat() { Log.d(TAG, "setupChat()"); // Initialize the array adapter for the conversation thread // mConversationArrayAdapter = new ArrayAdapter<String>(getActivity(), R.layout.message); // mConversationView.setAdapter(mConversationArrayAdapter); // Initialize the compose field with a listener for the return key // mOutEditText.setOnEditorActionListener(mWriteListener); // Initialize the send button with a listener that for click events // mSendButton.setOnClickListener(new View.OnClickListener() { // public void onClick(View v) { // // Send a message using content of the edit text widget // View view = getView(); // if (null != view) { // TextView textView = (TextView) view.findViewById(R.id.edit_text_out); // String message = textView.getText().toString(); // sendMessage(message); // } // } // }); // Initialize the BluetoothTalkService to perform bluetooth connections mChatService = new BluetoothTalkService(getActivity()); myTalker = new Talker(this, mChatService) { @Override void showToast(CharSequence text, int duration) { toaster(text, duration); } @Override void setActivityStatus(int resId) { setStatus(resId); } @Override void setActivityStatus(String s) { setStatus(s); } @Override long getCurrentKey() { return currentKey; } }; mChatService.setHandler(myTalker); saver = new SuggestAndSave(this.getContext()); mNewButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { currentKey = new Date().getTime(); if (mChatService.getState() != BluetoothTalkService.STATE_CONNECTED) { Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show(); } else { mChatService.clearObservations(); // myTalker.newMeasure(); Intent intGetFarmInfo = new Intent(getContext(), FarmEntryActivity.class); intGetFarmInfo.putExtra(FarmEntryActivity.observeKey, currentKey); startActivityForResult(intGetFarmInfo, FarmEntryActivity.REQUEST_NEW_ENTRY); } } }); // Initialize the buffer for outgoing messages mOutStringBuffer = new StringBuffer(""); } /** * Makes this device discoverable. */ private void ensureDiscoverable() { if (mBluetoothAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) { Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE); discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300); startActivity(discoverableIntent); } } /** * Sends a message. * * @param message A string of text to send. */ private void sendMessage(String message) { // Check that we're actually connected before trying anything if (mChatService.getState() != BluetoothTalkService.STATE_CONNECTED) { Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show(); return; } // Check that there's actually something to send if (message.length() > 0) { // Get the message bytes and tell the BluetoothTalkService to write byte[] send = message.getBytes(); mChatService.write(send); // Reset out string buffer to zero and clear the edit text field mOutStringBuffer.setLength(0); // mOutEditText.setText(mOutStringBuffer); } } private void sendMessage(Character message) { String str = message.toString(); sendMessage(str); } /** * The action listener for the EditText widget, to listen for the return key */ private TextView.OnEditorActionListener mWriteListener = new TextView.OnEditorActionListener() { public boolean onEditorAction(TextView view, int actionId, KeyEvent event) { // If the action is a key-up event on the return key, send the message if (actionId == EditorInfo.IME_NULL && event.getAction() == KeyEvent.ACTION_UP) { String message = view.getText().toString(); sendMessage(message); } return true; } }; /** * Updates the status on the action bar. * * @param resId a string resource ID */ public void setStatus(int resId) { FragmentActivity activity = getActivity(); if (null == activity) { return; } final ActionBar actionBar = activity.getActionBar(); if (null == actionBar) { return; } actionBar.setSubtitle(resId); } public void toaster(CharSequence text, int duration) { try { Toast.makeText(getContext(), text, duration).show(); } catch (NullPointerException e) { } } /** * Updates the status on the action bar. * * @param subTitle status */ private void setStatus(CharSequence subTitle) { FragmentActivity activity = getActivity(); if (null == activity) { return; } final ActionBar actionBar = activity.getActionBar(); if (null == actionBar) { return; } actionBar.setSubtitle(subTitle); } ArrayList<Integer> measures = new ArrayList<>(); SuggestAndSave saver; /** * The Handler that gets information back from the BluetoothTalkService */ public void onActivityResult(int requestCode, int resultCode, Intent data) { switch (requestCode) { case REQUEST_CONNECT_DEVICE_SECURE: // When DeviceListActivity returns with a device to connect if (resultCode == Activity.RESULT_OK) { connectDevice(data, true); } break; case REQUEST_CONNECT_DEVICE_INSECURE: // When DeviceListActivity returns with a device to connect if (resultCode == Activity.RESULT_OK) { connectDevice(data, false); } break; case REQUEST_ENABLE_BT: // When the request to enable Bluetooth returns if (resultCode == Activity.RESULT_OK) { // Bluetooth is now enabled, so set up a chat session setupChat(); } else { // User did not enable Bluetooth or an error occurred Log.d(TAG, "BT not enabled"); Toast.makeText(getActivity(), R.string.bt_not_enabled_leaving, Toast.LENGTH_SHORT).show(); mNewButton.hide(); } break; case FarmEntryActivity.REQUEST_NEW_ENTRY: if (resultCode == Activity.RESULT_OK) { processData(data); } break; } } float locAccuracy = 1000; Location current = new Location(locationProviderName); public void processData(final Intent data) { Toast.makeText(getContext(), "Received Info", Toast.LENGTH_SHORT).show(); myTalker.flushData(mChatService.inRedArray, mChatService.inGreenArray, mChatService.inBlueArray, mChatService.inCArray, mChatService.inLeafNumber, mChatService.incomingIndex, mChatService.leafIndex); data.putExtra(SuggestAndSave.red, mChatService.inRedArray); data.putExtra(SuggestAndSave.green, mChatService.inGreenArray); data.putExtra(SuggestAndSave.blue, mChatService.inBlueArray); data.putExtra(SuggestAndSave.C, mChatService.inCArray); TelephonyManager tmanager = (TelephonyManager) getActivity().getSystemService(Context.TELEPHONY_SERVICE); data.putExtra(SuggestAndSave.IMEI, tmanager.getDeviceId()); if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { // TODO: Consider calling // ActivityCompat#requestPermissions // here to request the missing permissions, and then overriding // public void onRequestPermissionsResult(int requestCode, String[] permissions, // int[] grantResults) // to handle the case where the user grants the permission. See the documentation // for ActivityCompat#requestPermissions for more details. // no location data, save without it saver.saveInfo(data); refreshCards(); } else { final long key_update = saver.saveInfo(data); refreshCards(); Toast.makeText(getActivity(), "Saved data, waiting for location", Toast.LENGTH_SHORT).show(); Log.d(TAG, "Waiting for location"); final long time = new Date().getTime(); LocationListener locationListener = new LocationListener() { @Override public void onLocationChanged(Location location) { if ((Math.abs(current.getAccuracy() - locAccuracy) < 20) || (new Date().getTime() - time > 3000)) { try { locationManager.removeUpdates(this); } catch (SecurityException e) { } Log.d(TAG, String.format("Lat: %f, Long: %f, Accuracy: %f", location.getLatitude(), location.getLongitude(), location.getAccuracy())); Toast.makeText(getActivity(), "Updated location", Toast.LENGTH_SHORT).show(); saver.updateLocation(key_update, location.getLatitude(), location.getLongitude()); refreshCards(); } } @Override public void onStatusChanged(String s, int i, Bundle bundle) { } @Override public void onProviderEnabled(String s) { } @Override public void onProviderDisabled(String s) { } }; locationManager.requestLocationUpdates(locationProviderName, 2000, 0, locationListener); } } public void refreshCards() { Log.d(TAG, "RefreshCards"); // cards.getAdapter().notifyDataSetChanged(); // cards.invalidate(); ViewAdapter vad = new ViewAdapter(getActivity()); cards.swapAdapter(vad, false); // cards.setAdapter(vad); } /** * Establish connection with other device * * @param data An {@link Intent} with {@link DeviceListActivity#EXTRA_DEVICE_ADDRESS} extra. * @param secure Socket Security type - Secure (true) , Insecure (false) */ private void connectDevice(Intent data, boolean secure) { // Get the device MAC address String address = data.getExtras().getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS); // Get the BluetoothDevice object BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address); // Attempt to connect to the device mChatService.connect(device, secure); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.bluetooth_chat, menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.secure_connect_scan: { // Launch the DeviceListActivity to see devices and do scan Intent serverIntent = new Intent(getActivity(), DeviceListActivity.class); startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_SECURE); return true; } // case R.id.insecure_connect_scan: { // // Launch the DeviceListActivity to see devices and do scan // Intent serverIntent = new Intent(getActivity(), DeviceListActivity.class); // startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_INSECURE); // return true; // } // case R.id.discoverable: { // // Ensure this device is discoverable by others // ensureDiscoverable(); // return true; // } } return false; } }