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.abs.mdu.bluetoothchat; 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.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.ArrayAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.ListView; import android.widget.SeekBar; import android.widget.TextView; import android.widget.Toast; import com.abs.mdu.common.logger.Log; import java.io.IOException; import java.nio.ByteBuffer; import java.util.Arrays; /** * This fragment controls Bluetooth to communicate with other devices. */ public class BluetoothChatFragment extends Fragment { private static final String TAG = "BluetoothChatFragment"; //for mdu private int id; byte start_byte; byte setCurrent; byte getCurrent; byte setTemperature; byte getTemperature; byte opc; byte status; // 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; public byte[] message_array; // Layout Views private ListView mConversationView; private EditText mOutEditText; private Button mSendButton; private SeekBar seekBar; private SeekBar seekBar2; private TextView textView; private TextView textView2; /** * 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 BluetoothChatService mChatService = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(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(); } } //end of on create @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() == BluetoothChatService.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); } @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); mSendButton = (Button) view.findViewById(R.id.button_send); seekBar = (SeekBar) view.findViewById(R.id.seekBar1); seekBar2 = (SeekBar) view.findViewById(R.id.seekBar2); textView = (TextView) view.findViewById(R.id.textView1); textView2 = (TextView) view.findViewById(R.id.textView2); initializeVariables(); // Initialize the textview with '0'. // textView.setText(getString(R.string.current_string) + seekBar.getProgress()); // textView2.setText(getString(R.string.temperature_string) + seekBar.getProgress()); } /** * 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 //MDu will change it to send the seekbar value when released 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 BluetoothChatService to perform bluetooth connections mChatService = new BluetoothChatService(getActivity(), mHandler); // Initialize the buffer for outgoing messages mOutStringBuffer = new StringBuffer(""); seekBar2.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { float progress = 0.0f; @Override public void onProgressChanged(SeekBar seekBar, int progresValue, boolean fromUser) { progress = progresValue; } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { textView2.setText(getString(R.string.temperature_string) + progress); try { sendMsg(progress, setTemperature); } catch (IOException e) { e.printStackTrace(); } } }); seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { int progress = 0; @Override public void onProgressChanged(SeekBar seekBar, int progresValue, boolean fromUser) { progress = progresValue; } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { textView.setText(getString(R.string.current_string) + progress); //mOutEditText = (EditText) findViewById(R.id.edit_text_out); try { sendMsg(progress, setCurrent); } catch (IOException e) { e.printStackTrace(); } } }); } /** * 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() != BluetoothChatService.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(); // I will here get the data from the seek bar and construct the message before is is sended mChatService.write(send); // Reset out string buffer to zero and clear the edit text field mOutStringBuffer.setLength(0); mOutEditText.setText(mOutStringBuffer); } } /** * 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 BluetoothChatService */ 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 BluetoothChatService.STATE_CONNECTED: setStatus(getString(R.string.title_connected_to, mConnectedDeviceName)); mConversationArrayAdapter.clear(); break; case BluetoothChatService.STATE_CONNECTING: setStatus(R.string.title_connecting); break; case BluetoothChatService.STATE_LISTEN: case BluetoothChatService.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); //mConversationArrayAdapter.add("Sent: " + writeMessage); mConversationArrayAdapter.add("Sent: " + Arrays.toString(writeBuf)); break; case Constants.MESSAGE_READ: byte[] readBuf = (byte[]) msg.obj; byte[] readMsg_byte = (byte[]) msg.obj; // construct a string from the valid bytes in the buffer String readMessage;// = new String(readBuf, 0, msg.arg1); readMessage = ""; //convert SLS msg to byte array and analyse bute 5 to see the command: String newReadMessage = check_cmd(readMsg_byte); mConversationArrayAdapter.add("Dev: " + mConnectedDeviceName + ": " + newReadMessage); 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; } } }; private String check_cmd(byte[] readMsg_byte) { String readMessage; switch (readMsg_byte[5]) { case 0: readMessage = "SLS_cmd_sys_getStatus"; break; case 1: readMessage = "SLS_cmd_sys_selfTest"; break; case 2: readMessage = "SLS_cmd_sys_heartbeat"; break; case 3: readMessage = "SLS_cmd_sys_Info"; break; case 4: readMessage = "SLS_cmd_sys_setEvents"; break; case 5: readMessage = "SLS_cmd_sys_getEvents"; break; case 6: readMessage = "SLS_cmd_sys_setBoardData"; break; case 7: readMessage = "SLS_cmd_sys_getBoardData"; break; case 8: readMessage = "SLS_cmd_Monitor_setSampling"; break; case 9: readMessage = "SLS_cmd_Monitor_getSampling"; break; case 10: readMessage = "SLS_cmd_LED_setCurrent"; break; case 11: readMessage = "SLS_cmd_LED_getCurrent"; break; case 26: readMessage = "SLS_cmd_TEC_setTemperature"; break; case 27: readMessage = "SLS_cmd_TEC_getTemperature"; break; default: readMessage = "Command not recognized"; break; } return readMessage; } 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(); getActivity().finish(); } } } /** * Establish connection with other divice * * @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; } // A private method to help us initialize our variables. private void initializeVariables() { seekBar.setMax(600); seekBar2.setMax(70); id = 0; start_byte = 0x7E; setCurrent = 0x0A; getCurrent = 0x0B; setTemperature = 0x1A; getTemperature = 0x1B; opc = 0x70; status = 0x00; } private void sendMsg(float progress, byte cmd) throws IOException { String s = ""; byte[] temperature_msg = new byte[11]; Arrays.fill(temperature_msg, (byte) 0); ByteBuffer buffer = ByteBuffer.allocate(4); buffer.putFloat(progress); byte[] byte_progress = new byte[4]; ; Arrays.fill(byte_progress, (byte) 0); byte_progress = buffer.array(); temperature_msg[0] = start_byte; //length in the end temperature_msg[2] = opc; temperature_msg[3] = (byte) id; temperature_msg[4] = cmd; temperature_msg[5] = status; temperature_msg[6] = (byte) byte_progress[3]; temperature_msg[7] = (byte) byte_progress[2]; temperature_msg[8] = (byte) byte_progress[1]; temperature_msg[9] = (byte) byte_progress[0]; temperature_msg[1] = (byte) (temperature_msg.length - 2); byte crc, i; crc = 0; for (i = 0; i < temperature_msg.length; i++) { crc ^= temperature_msg[i]; } temperature_msg[10] = ((byte) crc); /* Charset mycharset = defaultCharset(); //length must be in the end, when msg is completely build; //best working, only missing negative charaters thar are trasnlated into more the one bytes String temperature_msg_string = new String(temperature_msg, mycharset); //must put the correct encoding for the negatives if(temperature_msg_string.length() != 11 ) { temperature_msg_string = "Error size = " + temperature_msg_string.length(); } //mOutEditText.setText(temperature_msg_string); */ mChatService.write(temperature_msg); // Reset out string buffer to zero and clear the edit text field mOutStringBuffer.setLength(0); mOutEditText.setText(mOutStringBuffer); id++; //mSendButton.callOnClick(); } }