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 uk.co.ivaylokhr.crawl.Controller; import android.app.ActionBar; import android.app.Activity; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.EditText; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import uk.co.ivaylokhr.crawl.Activities.DeviceListActivity; import uk.co.ivaylokhr.crawl.Model.Constants; import uk.co.ivaylokhr.crawl.R; /** * This fragment controls Bluetooth to communicate with other devices. */ public class BluetoothController extends Fragment { private static final String TAG = "BluetoothController"; // Intent request codes private static final int REQUEST_CONNECT_DEVICE_SECURE = 1; private static final int REQUEST_ENABLE_BT = 3; private TextView text; // Layout Views private ListView mConversationView; private EditText mOutEditText; private Boolean connected; /** * 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 BluetoothManager mChatService = null; /** * @param savedInstanceState */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); // Get local Bluetooth adapter connected = false; mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); // 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(); } } @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 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() == BluetoothManager.STATE_NONE) { // Start the Bluetooth chat services mChatService.start(); } } } /** * @param inflater * @param container * @param savedInstanceState * @return */ @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_devicelist, container, false); } /** * @param view * @param savedInstanceState */ @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { mConversationView = (ListView) view.findViewById(R.id.in); mOutEditText = (EditText) view.findViewById(R.id.edit_text_out); } /** * Set up the UI and background operations for chat. */ private void setupChat() { // Initialize the array adapter for the conversation thread mConversationArrayAdapter = new ArrayAdapter<String>(getActivity(), R.layout.message); mConversationView.setAdapter(mConversationArrayAdapter); // Initialize the BluetoothManager to perform bluetooth connections mChatService = new BluetoothManager(getActivity(), mHandler); // Initialize the buffer for outgoing messages mOutStringBuffer = new StringBuffer(""); } /** * returns the Bluetooth Manager * @return mChatService */ public BluetoothManager returnService() { return mChatService; } /** * 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. */ public void sendMessage(String message) { // Check that we're actually connected before trying anything if (mChatService.getState() != BluetoothManager.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 BluetoothManager 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); } } /** * Updates the status on the action bar. * @param resId a string resource ID */ private void setStatus(int resId) { FragmentActivity activity = getActivity(); if (null == activity) { return; } final ActionBar actionBar = activity.getActionBar(); if (null == actionBar) { return; } actionBar.setSubtitle(resId); } /** * 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); } /** * sets connected to match whether or not you are connected to another device * @param x */ public void connect(boolean x) { connected = x; } /** * returns whether or not you are connected to another device * @return connected */ public boolean getState() { return connected; } /** * The Handler that gets information back from the BluetoothManager */ public final Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { FragmentActivity activity = getActivity(); switch (msg.what) { case Constants.MESSAGE_STATE_CHANGE: switch (msg.arg1) { case BluetoothManager.STATE_CONNECTED: setStatus(getString(R.string.title_connected_to, mConnectedDeviceName)); mConversationArrayAdapter.clear(); ButtonPressed("start"); connect(true); break; case BluetoothManager.STATE_CONNECTING: setStatus(R.string.title_connecting); connect(false); break; case BluetoothManager.STATE_LISTEN: connect(false); case BluetoothManager.STATE_NONE: setStatus(R.string.title_not_connected); ButtonPressed("no"); connect(false); break; } break; case Constants.MESSAGE_WRITE: byte[] writeBuf = (byte[]) msg.obj; // construct a string from the buffer String writeMessage = new String(writeBuf); mConversationArrayAdapter.add("Me: " + writeMessage); break; case Constants.MESSAGE_READ: byte[] readBuf = (byte[]) msg.obj; // construct a string from the valid bytes in the buffer String readMessage = new String(readBuf, 0, msg.arg1); ButtonPressed(readMessage); mConversationArrayAdapter.add(mConnectedDeviceName + ": " + readMessage); break; case Constants.MESSAGE_DEVICE_NAME: // save the connected device's name mConnectedDeviceName = msg.getData().getString(Constants.DEVICE_NAME); if (null != activity) { Toast.makeText(activity, "Connected to " + mConnectedDeviceName, Toast.LENGTH_SHORT).show(); } break; case Constants.MESSAGE_TOAST: if (null != activity) { Toast.makeText(activity, msg.getData().getString(Constants.TOAST), Toast.LENGTH_SHORT).show(); } break; } } }; /** * takes the message that has been sent and puts it in a textfield that can then be read from the GameActivity class * @param readMessage */ public void ButtonPressed(String readMessage) { try { text.setText(""); text.setText(readMessage); text.performClick(); } catch (Exception e) { } } /** * detects when a bluetooth link is completed and acts accordingly * @param requestCode * @param resultCode * @param data */ 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); //make this player player 1 ButtonPressed("yes"); } 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 { Toast.makeText(getActivity(), R.string.bt_not_enabled, Toast.LENGTH_SHORT).show(); } } } /** * 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); } //starts the method which lets you search for others using bluetooth public void connectBluetooth() { Intent serverIntent = new Intent(getActivity(), DeviceListActivity.class); startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_SECURE); } public void discoverable() { // Ensure this device is discoverable by others ensureDiscoverable(); } /** * adds Textview which records any inputs from the opponent * @param bluetoothPressed */ public void addText(TextView bluetoothPressed) { text = bluetoothPressed; } }