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.pipirssolutions.aeseztargetcontroller; 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.util.Log; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.inputmethod.EditorInfo; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import java.util.ArrayList; /** * This fragment controls Bluetooth to communicate with other devices. */ public class ProgramFragment extends Fragment { // 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 TextView mProgramNameView; private TextView mProgramModeView; private TextView mProgramModeTimeView; private TextView mProgramTotalTimeView; private Button mSendTransmissionButton; private final static String TAG = "ProgramFragment"; /** * Name of the connected device */ private String mConnectedDeviceName = null; /** * Program Structure containing program variables */ private ArrayList<Program> mPrograms; //current program running private String currentProgramName = "Select an program"; private ArrayList<String> mProgram; /** * String buffer for outgoing transmission */ private StringBuffer mOutStringBuffer; /** * Local Bluetooth adapter */ private BluetoothAdapter mBluetoothAdapter = null; /** * Member object for the bluetooth communication services */ private BluetoothCommunicationService mCommunicationService = null; private byte[] payLoad; private boolean buttonEnabled; /** * Heartbeat timer */ private Handler handler; private int ms; private boolean blocked; /** * @param programTitle * @param programCode */ //this call back method sets the program code and title etc from the activity public void setProgram(String programTitle, ArrayList<String> programCode) { this.mProgram = programCode; this.currentProgramName = programTitle; this.mProgramNameView.setText(programTitle); } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); handler = new Handler(); blocked = true; // Get local Bluetooth adapter 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(); 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 (mCommunicationService == null) { setupTransmission(); } } @Override public void onDestroy() { super.onDestroy(); if (mCommunicationService != null) { mCommunicationService.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 (mCommunicationService != null) { // Only if the state is STATE_NONE, do we know that we haven't started already if (mCommunicationService.getState() == BluetoothCommunicationService.STATE_NONE) { // Start the Bluetooth chat services mCommunicationService.start(); } } } @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_bluetooth_program, container, false); } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { mProgramNameView = (TextView) view.findViewById(R.id.program_name); mProgramModeView = (TextView) view.findViewById(R.id.program_mode); mProgramModeTimeView = (TextView) view.findViewById(R.id.program_mode_time); mProgramTotalTimeView = (TextView) view.findViewById(R.id.program_totaltime); mSendTransmissionButton = (Button) view.findViewById(R.id.button_send); } /** * Set up the UI and background operations for chat. */ private void setupTransmission() { // Initialize the send button with a listener that for click events mSendTransmissionButton.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) { buttonEnabled = true; //TODO remove the code below sendCode(mProgram); } } }); // Initialize the BluetoothChatService to perform bluetooth connections mCommunicationService = new BluetoothCommunicationService(getActivity(), mHandler); // 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 programCode A ArrayList<string> of code to send. */ private void sendCode(ArrayList<String> programCode) { // Check that we're actually connected before trying anything if (mCommunicationService.getState() != BluetoothCommunicationService.STATE_CONNECTED) { Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show(); return; } // Check that there's actually something to send if (programCode.size() > 0) { //send start of code String temp = "Start of Transmission -program name: " + currentProgramName + " \n \r"; byte[] send = temp.getBytes(); mCommunicationService.write(send); // loop through the array and send string by string for (int i = 0; i < programCode.size(); i++) { // Get the message bytes and tell the BluetoothChatService to write send = programCode.get(i).getBytes(); mCommunicationService.write(send); // Reset out string buffer to zero and clear the edit text field mOutStringBuffer.setLength(0); //FIXME check this out //mTransmissionEditText.setText(mOutStringBuffer); } //send end of code temp = "End of transmission \n \r"; send = temp.getBytes(); mCommunicationService.write(send); } } /** * Sends a message. * * @param message A message of string to send. */ private void sendMessage(String message) { // Check that we're actually connected before trying anything if (mCommunicationService.getState() != BluetoothCommunicationService.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 BluetoothChatService to write byte[] send = message.getBytes(); mCommunicationService.write(send); // Reset out string buffer to zero and clear the edit text field mOutStringBuffer.setLength(0); } } /** * @param c a command to send */ private void sendCommand(char c) { // Check that we're actually connected before trying anything if (mCommunicationService.getState() != BluetoothCommunicationService.STATE_CONNECTED) { Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show(); return; } // Get the message bytes and tell the BluetoothChatService to write byte[] send = { (byte) 2, (byte) 0, (byte) 7, (byte) c, (byte) 0, (byte) 0, (byte) 3 }; mCommunicationService.write(send); // Reset out string buffer to zero and clear the edit text field mOutStringBuffer.setLength(0); } /** * @param c a command to send */ private void sendACK(char c) { // Check that we're actually connected before trying anything if (mCommunicationService.getState() != BluetoothCommunicationService.STATE_CONNECTED) { Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show(); return; } String temp = "Ack"; // Get the message bytes and tell the BluetoothChatService to write byte[] send = temp.getBytes(); mCommunicationService.write(send); // Reset out string buffer to zero and clear the edit text field mOutStringBuffer.setLength(0); } /** * 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 */ 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); } /** * The Handler that gets information back from the BluetoothCommunicationService */ private 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 BluetoothCommunicationService.STATE_CONNECTED: setStatus(getString(R.string.title_connected_to, mConnectedDeviceName)); break; case BluetoothCommunicationService.STATE_CONNECTING: setStatus(R.string.title_connecting); break; case BluetoothCommunicationService.STATE_LISTEN: case BluetoothCommunicationService.STATE_NONE: setStatus(R.string.title_not_connected); break; } break; case Constants.MESSAGE_WRITE: byte[] writeBuf = (byte[]) msg.obj; // construct a string from the buffer String writeMessage = new String(writeBuf); //Toast.makeText(activity, "Incomming msg: " + writeMessage, Toast.LENGTH_SHORT).show(); 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); processData(readBuf, activity); 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; } } }; /** * Invariant * * @param readBuf * @param activity */ private void processData(byte[] readBuf, FragmentActivity activity) { final StringBuilder builder = new StringBuilder(); int FRAMELENGTH = 0; //builder.append(String.format("%02x", readBuf[0])).toString() switch (((int) readBuf[0])) { //Fetch STX = this is an start of transmission case 02: Log.d(TAG, String.format("STX found ")); //Calculate FRAMELENGTH & check that its not corrupt FRAMELENGTH = readBuf[1] * 256; FRAMELENGTH = FRAMELENGTH + readBuf[2]; Log.d(TAG, String.format("Framelength = " + FRAMELENGTH)); if (FRAMELENGTH < 7) { Log.d(TAG, String.format("Corrupt framelength <7 = " + FRAMELENGTH)); //NACK sendCommand((char) 21); break; } //Fetch etx this is the end of the transmission if (((int) readBuf[FRAMELENGTH - 1]) != 3) { Log.d(TAG, String.format("No etx found")); //NACK sendCommand((char) 21); break; } Log.d(TAG, String.format("Etx was found")); //update Payload payLoad = new byte[FRAMELENGTH - 6]; for (int i = 4; i < FRAMELENGTH - 2; i++) { payLoad[i - 4] = readBuf[i]; } //check checksum int cs = readBuf[1] ^ readBuf[2]; cs = cs ^ readBuf[3]; for (int i = 0; i < payLoad.length; i++) { cs = cs ^ payLoad[i]; } if (cs != readBuf[FRAMELENGTH - 1]) { Log.d(TAG, String.format("CS was not correct")); //TODO return NACK here and BREAK } //Fetch the command () switch (builder.append(String.format("%02x", readBuf[3])).toString()) { case "81": //HeartBeat Log.d(TAG, String.format("Heatbeat Recieved ")); //blocked initiate timer if (!blocked) { //resetted ms counter ms = 0; Log.d(TAG, String.format("Timer was resseted ")); } //reset timer normal else { blocked = false; ms = 0; mHandler.postDelayed(heartBeatTimer, 100); Log.d(TAG, String.format("Timer was unblocked and reinitialised ")); } //ACK sendCommand((char) 6); break; case "82": //Display Log.d(TAG, String.format("Display Command Recieved ")); mProgramModeView.setText(new String(payLoad)); //ACK sendACK((char) 6); Thread thread = new Thread(); try { thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } sendACK((char) 6); try { thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } sendCommand((char) 6); break; case "83": //repeat Log.d(TAG, String.format("Repeat Command Recieved ")); //ACK sendCommand((char) 6); break; case "84": //Time Log.d(TAG, String.format("Time Command Recieved ")); mProgramModeTimeView.setText(new String(payLoad)); //ACK sendCommand((char) 6); break; case "85": //requesting the state of the button if the button is enabled start! if (buttonEnabled) { sendCommand((char) 0); Log.d(TAG, String.format("Button status was requested: " + buttonEnabled)); buttonEnabled = false; Log.d(TAG, String.format("Button status has changed:" + buttonEnabled)); } else { sendCommand((char) 1); //send the state of the button. Log.d(TAG, String.format("Button status was requested: " + buttonEnabled)); } break; case "86": //Changeprogram_req Log.d(TAG, String.format("Request program command recieved ")); if (mProgram != null) sendCode(mProgram); //TODO tell the user the button is enabled break; case "06": //ACK Log.d(TAG, String.format("Ack Command Recieved ")); break; case "15": //NAK //reSend Program sendCode(mProgram); Log.d(TAG, String.format("NCK Command Recieved ")); break; } break; } } private Runnable heartBeatTimer = new Runnable() { @Override public void run() { //do something ms++; if (ms >= 20) { //stop and clear variables buttonEnabled = false; blocked = true; Log.d(TAG, String.format("Heartbeat timer was not resetted and have expired")); } else { //reset mHandler.postDelayed(this, 100); } } }; private void reply() { } 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 setupTransmission(); } else { // User did not enable Bluetooth or an error occurred Toast.makeText(getActivity(), R.string.bt_not_enabled_leaving, Toast.LENGTH_SHORT).show(); getActivity().finish(); } } } /** * Establish connection with other divice * * @param data An {@link android.content.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 mCommunicationService.connect(device, secure); } /** * put this in menu */ public void launchDeviceFinder() { // Launch the DeviceListActivity to see devices and do scan Intent serverIntent = new Intent(getActivity(), DeviceListActivity.class); startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_INSECURE); } /* case R.id.insecure_connect_scan: { case R.id.discoverable: { // Ensure this device is discoverable by others ensureDiscoverable(); return true; */ }