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 org.surfsite.iconsole; import android.annotation.SuppressLint; import android.app.ActionBar; import android.app.Activity; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.os.Bundle; import android.os.Handler; import android.os.IBinder; 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.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.NumberPicker; import android.widget.TextView; import android.widget.Toast; /** * This fragment controls Bluetooth to communicate with other devices. */ public class BluetoothChatFragment 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_ENABLE_BT = 3; // Layout Views //private ListView mConversationView; private Button mStartButton; private Button mStopButton; private Button mDisconnectButton; private NumberPicker mLevel; private TextView mSpeedText; private TextView mPowerText; private TextView mRPMText; private TextView mDistanceText; private TextView mCaloriesText; private TextView mHFText; private TextView mTimeText; /** * Name of the connected device */ private String mConnectedDeviceName = null; /** * Array adapter for the conversation thread private ArrayAdapter<String> mConversationArrayAdapter; */ /** * Local Bluetooth adapter */ private BluetoothAdapter mBluetoothAdapter = null; /** * Member object for the chat services */ private BluetoothChatService mChatService = null; private boolean mIsBound; private ChannelService.ChannelServiceComm mChannelService; /** * The Handler that gets information back from the BluetoothChatService */ private final Handler mHandler = new Handler() { @SuppressLint("DefaultLocale") @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(); mStartButton.setEnabled(true); mStopButton.setEnabled(true); mDisconnectButton.setEnabled(true); mLevel.setEnabled(true); mLevel.setValue(1); break; case BluetoothChatService.STATE_CONNECTING: setStatus(R.string.title_connecting); mStartButton.setEnabled(false); mStopButton.setEnabled(false); mDisconnectButton.setEnabled(false); mLevel.setEnabled(false); break; case BluetoothChatService.STATE_LISTEN: case BluetoothChatService.STATE_NONE: setStatus(R.string.title_not_connected); mStartButton.setEnabled(false); mStopButton.setEnabled(false); mDisconnectButton.setEnabled(false); mLevel.setEnabled(false); break; } break; case Constants.MESSAGE_DATA: if (!(msg.obj instanceof IConsole.Data)) return; IConsole.Data data = (IConsole.Data) msg.obj; mChannelService.setSpeed(data.mSpeed10 / 10.0); mChannelService.setPower(data.mPower10 / 10); mChannelService.setCadence(data.mRPM); mSpeedText.setText(String.format("% 3.1f", data.mSpeed10 / 10.0)); mPowerText.setText(String.format("% 3.1f", data.mPower10 / 10.0)); mRPMText.setText(String.format("%d", data.mRPM)); mDistanceText.setText(String.format("% 3.1f", data.mDistance10 / 10.0)); mCaloriesText.setText(String.format("% 3d", data.mCalories)); mHFText.setText(String.format("%d", data.mHF)); mTimeText.setText(String.format("%s", data.getTimeStr())); //mLevel.setValue(data.mLevel); 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); //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; } } }; private boolean mChannelServiceBound = false; private ServiceConnection mConnection = new ServiceConnection() { public void onServiceConnected(ComponentName className, IBinder service) { // This is called when the connection with the service has been // established, giving us the service object we can use to // interact with the service. Because we have bound to a explicit // service that we know is running in our own process, we can // cast its IBinder to a concrete class and directly access it. mChatService = ((BluetoothChatService.BluetoothChatServiceI) service).getService(); ((BluetoothChatService.BluetoothChatServiceI) service).setHandler(mHandler); Log.d(TAG, "onServiceConnected()"); } public void onServiceDisconnected(ComponentName className) { // This is called when the connection with the service has been // unexpectedly disconnected -- that is, its process crashed. // Because it is running in our same process, we should never // see this happen. mChatService = null; } }; private ServiceConnection mChannelServiceConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder serviceBinder) { Log.v(TAG, "mChannelServiceConnection.onServiceConnected..."); mChannelService = (ChannelService.ChannelServiceComm) serviceBinder; Log.v(TAG, "...mChannelServiceConnection.onServiceConnected"); } @Override public void onServiceDisconnected(ComponentName arg0) { Log.v(TAG, "mChannelServiceConnection.onServiceDisconnected..."); // Clearing and disabling when disconnecting from ChannelService mChannelService = null; Log.v(TAG, "...mChannelServiceConnection.onServiceDisconnected"); } }; @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(); } } @Override public void onStart() { super.onStart(); // If BT is not on, request that it be enabled. // setupChat() will then be called during onActivityResult if (null == mBluetoothAdapter || !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(); } if (!mChannelServiceBound) doBindChannelService(); } @Override public void onDestroy() { if (mChatService != null) { mChatService.stopBT(); } Log.d(TAG, "onDestroy()"); doUnbindService(); doUnbindChannelService(); mChannelServiceConnection = null; super.onDestroy(); } @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.startBT(); } } } @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); mStartButton = (Button) view.findViewById(R.id.button_start); mStopButton = (Button) view.findViewById(R.id.button_stop); mDisconnectButton = (Button) view.findViewById(R.id.button_disconnect); mLevel = (NumberPicker) view.findViewById(R.id.Level); mLevel.setMaxValue(32); mLevel.setMinValue(1); mLevel.setValue(1); mLevel.setWrapSelectorWheel(false); mLevel.setDescendantFocusability(NumberPicker.FOCUS_BLOCK_DESCENDANTS); mSpeedText = (TextView) view.findViewById(R.id.Speed); mPowerText = (TextView) view.findViewById(R.id.Power); mRPMText = (TextView) view.findViewById(R.id.RPM); mDistanceText = (TextView) view.findViewById(R.id.Distance); mCaloriesText = (TextView) view.findViewById(R.id.Calories); mHFText = (TextView) view.findViewById(R.id.Heart); mTimeText = (TextView) view.findViewById(R.id.Time); } void doBindService() { Log.d(TAG, "doBindService()"); // Establish a connection with the service. We use an explicit // class name because we want a specific service implementation that // we know will be running in our own process (and thus won't be // supporting component replacement by other applications). getActivity().bindService(new Intent(getActivity(), BluetoothChatService.class), mConnection, Context.BIND_AUTO_CREATE); mIsBound = true; } void doUnbindService() { if (mIsBound) { // Detach our existing connection. getActivity().unbindService(mConnection); mIsBound = false; } } private void doBindChannelService() { Log.v(TAG, "doBindChannelService..."); // Binds to ChannelService. ChannelService binds and manages connection between the // app and the ANT Radio Service mChannelServiceBound = getActivity().bindService(new Intent(getActivity(), ChannelService.class), mChannelServiceConnection, Context.BIND_AUTO_CREATE); if (!mChannelServiceBound) //If the bind returns false, run the unbind method to update the GUI doUnbindChannelService(); Log.i(TAG, " Channel Service binding = " + mChannelServiceBound); Log.v(TAG, "...doBindChannelService"); } private void doUnbindChannelService() { Log.v(TAG, "doUnbindChannelService..."); if (mChannelServiceBound) { getActivity().unbindService(mChannelServiceConnection); mChannelServiceBound = false; } Log.v(TAG, "...doUnbindChannelService"); } /** * Set up the UI and background operations for chat. */ private void setupChat() { Log.d(TAG, "setupChat()"); if (!mIsBound) doBindService(); mStartButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mLevel.setValue(1); if (mChatService != null) mChatService.startIConsole(); } }); mStopButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mLevel.setValue(1); if (mChatService != null) mChatService.stopIConsole(); } }); mDisconnectButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mLevel.setValue(1); if (mChatService != null) mChatService.stopBT(); } }); mStartButton.setEnabled(false); mStopButton.setEnabled(false); mDisconnectButton.setEnabled(false); mLevel.setEnabled(false); mLevel.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() { @Override public void onValueChange(NumberPicker p, int oldval, int newval) { //Log.e(TAG, "setLevel"); if (mChatService != null) { if (!mChatService.setLevel(newval)) Log.e(TAG, "setLevel failed"); } } }); } /** * Makes this device discoverable for 300 seconds (5 minutes). */ 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) { if (mChatService == null) return; // 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; } mChatService.startIConsole(); } /** * 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); } 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_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 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 if (mChatService != null) mChatService.connect(device); } @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; } } return false; } }