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The source code is released under:
GNU Lesser General Public License
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/* * Copyright (C) 2009 The Android Open Source Project */* w ww . j av a2 s. c om*/ * 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 de.uos.nbp.senhance.bluetooth; import java.util.HashSet; import java.util.Set; import de.uos.nbp.senhance.R; import android.app.Activity; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.Window; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListView; import android.widget.TextView; import android.widget.AdapterView.OnItemClickListener; /** * This Activity appears as a dialog. It lists paired devices and devices * detected in the area after discovery, as long as they match the * regular expression provided by the calling activity. * When a device is chosen by the user, the MAC address of the device * is sent back to the parent Activity in the result Intent. */ public class DeviceListActivity extends Activity { private static final String TAG = "Senhance"; private static final boolean D = true; /* debugging */ /* Intent Extras */ public static final String INTENT_DEVICENAMEFILTER = "de.uos.nbp.senhance.deviceNameFilter"; public static final String INTENT_DEVICETYPE = "de.uos.nbp.senhance.deviceType"; public static final String INTENT_DEVICEID = "de.uos.nbp.senhance.deviceID"; public static final String INTENT_DEVICEADDRESS = "de.uos.nbp.senhance.deviceAddress"; private static final int REQUEST_ENABLE_BT = 2; /* Member fields */ private BluetoothAdapter mBtAdapter; private ArrayAdapter<String> mPairedDevicesArrayAdapter; private ArrayAdapter<String> mNewDevicesArrayAdapter; private String mDeviceType; private int mID; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (D) Log.v(TAG, "DeviceListActivity.onCreate()"); // Setup the window requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); setContentView(R.layout.device_list); /* * Set result CANCELED in case activity ends without going through the * explicit finishWith...() functions. */ setResult(Activity.RESULT_CANCELED); // Get the local Bluetooth adapter mBtAdapter = BluetoothAdapter.getDefaultAdapter(); if (mBtAdapter == null) { Log.e(TAG, "DeviceListActivity|No bluetooth adapter found on this device."); finishWithCancel(); return; } /* * If bluetooth is not enabled at the moment, then request it to be * enabled. */ if (!mBtAdapter.isEnabled()) { Log.i(TAG, "DeviceListActivity|requesting bluetooth enable..."); Intent enableBtIntent = new Intent( BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT); } else { Log.i(TAG, "DeviceListActivity|Bluetooth is enabled"); } // Initialize array adapters. One for already paired devices and // one for newly discovered devices mPairedDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name); mNewDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name); // Find and set up the ListView for paired devices ListView pairedListView = (ListView) findViewById(R.id.paired_devices); pairedListView.setAdapter(mPairedDevicesArrayAdapter); pairedListView.setOnItemClickListener(mDeviceClickListener); // Find and set up the ListView for newly discovered devices ListView newDevicesListView = (ListView) findViewById(R.id.new_devices); newDevicesListView.setAdapter(mNewDevicesArrayAdapter); newDevicesListView.setOnItemClickListener(mDeviceClickListener); // Get a set of currently paired devices Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices(); Set<BluetoothDevice> pairedECGDevices = new HashSet<BluetoothDevice>(); mID = getIntent().getIntExtra(INTENT_DEVICEID, -1); mDeviceType = getIntent().getStringExtra(INTENT_DEVICETYPE); String deviceNameFilter = getIntent().getStringExtra( INTENT_DEVICENAMEFILTER); doSetTitle(getString(R.string.select_device)); if (D) Log.v(TAG, "DeviceListActivity|"+mDeviceType+"("+mID+") ["+deviceNameFilter+"]"); /* * Remove all non-matching devices from the set. We are interested * only in those devices that match the given regular expression. */ if (pairedDevices.size() > 0) { for (BluetoothDevice device : pairedDevices) { /* is name the best way to identify this? */ if ((deviceNameFilter != null) && device.getName().matches(deviceNameFilter)) { pairedECGDevices.add(device); } } } if (pairedECGDevices.size() > 0) { /* if there remain paired devices, action them */ findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE); if (D) Log.i(TAG, "DeviceListActivity|found " + pairedECGDevices.size() + " paired devices."); if (pairedECGDevices.size() == 1) { /* * We want to automatically respond if there is only a single * device matching the filter. */ BluetoothDevice dev = pairedECGDevices.iterator().next(); String address = dev.getAddress(); finishWithSuccess(address); } else { /* * if there are more than one appropriate device, add each one * to the ArrayAdapter */ for (BluetoothDevice device : pairedECGDevices) { mPairedDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress()); } } } else { String noDevices = getResources().getText(R.string.none_paired) .toString(); mPairedDevicesArrayAdapter.add(noDevices); } // Initialize the button to perform device discovery Button scanButton = (Button) findViewById(R.id.button_scan); scanButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { doDiscovery(); v.setVisibility(View.GONE); } }); Button cancelButton = (Button) findViewById(R.id.button_cancel); cancelButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { finishWithCancel(); } }); } /* * (non-Javadoc) * * @see android.app.Activity#onResume() */ @Override protected void onResume() { if (D) Log.d(TAG, "DeviceListActivity.onResume()"); super.onResume(); // Register for broadcasts when a device is discovered IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND); this.registerReceiver(mReceiver, filter); // Register for broadcasts when discovery has finished filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); this.registerReceiver(mReceiver, filter); } /* * (non-Javadoc) * * @see android.app.Activity#onPause() */ @Override protected void onPause() { if (D) Log.d(TAG, "DeviceListActivity.onPause()"); // Unregister broadcast listeners this.unregisterReceiver(mReceiver); super.onPause(); } @Override protected void onDestroy() { if (D) Log.d(TAG, "DeviceListActivity.onDestroy()"); // Make sure we're not doing discovery anymore if (mBtAdapter != null) { mBtAdapter.cancelDiscovery(); } super.onDestroy(); } /** * Finish this activity successfully and return to caller, specifying in the * Intent the address of the found device. * * The device ID that was passed on creation is also returned to allow the * calling activity to identify for which device this search was conducted. * * @param address */ private void finishWithSuccess(String address) { /* Create the result Intent and include the MAC address and deviceID. */ Intent intent = new Intent(); intent.putExtra(INTENT_DEVICEID, mID); intent.putExtra(INTENT_DEVICEADDRESS, address); /* set result and finish this Activity */ setResult(Activity.RESULT_OK, intent); finish(); } /** * Finish this activity and return to caller indicating non-success - that * is, search canceled. * * The device ID that was passed on creation is also returned to allow the * calling activity to identify for which device this search was conducted. */ private void finishWithCancel() { Intent intent = new Intent(); intent.putExtra(INTENT_DEVICEID, mID); if (D) Log.v(TAG, "DeviceListActivity|finishWithCancel("+mID+")"); setResult(Activity.RESULT_CANCELED, intent); finish(); } private void doSetTitle(String txt) { StringBuilder sb = new StringBuilder(); if (mDeviceType != null) sb.append(mDeviceType).append(": "); sb.append(txt); setTitle(sb.toString()); } /** * Start device discover with the BluetoothAdapter */ private void doDiscovery() { if (D) Log.d(TAG, "DeviceListActivity|doDiscovery()"); // Indicate scanning in the title setProgressBarIndeterminateVisibility(true); doSetTitle(getString(R.string.scanning)); // Turn on sub-title for new devices findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE); if (mBtAdapter != null) { // If we're already discovering, stop it if (mBtAdapter.isDiscovering()) { mBtAdapter.cancelDiscovery(); } // Request discover from BluetoothAdapter mBtAdapter.startDiscovery(); } } // The on-click listener for all devices in the ListViews private OnItemClickListener mDeviceClickListener = new OnItemClickListener() { public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) { /* * Cancel discovery because it's costly and we're about to connect. */ if (D) Log.v(TAG, "DeviceListActivity|onItemClick()"); if (mBtAdapter.isDiscovering()) mBtAdapter.cancelDiscovery(); /* * Get the device MAC address, which is the last 17 chars in the * View */ String info = ((TextView) v).getText().toString(); String address = info.substring(info.length() - 17); finishWithSuccess(address); } }; // The BroadcastReceiver that listens for discovered devices and // changes the title when discovery is finished private final BroadcastReceiver mReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); // When discovery finds a device if (BluetoothDevice.ACTION_FOUND.equals(action)) { // Get the BluetoothDevice object from the Intent BluetoothDevice device = intent .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); // If it's already paired, skip it, because it's been listed // already if (device.getBondState() != BluetoothDevice.BOND_BONDED) { mNewDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress()); } // When discovery is finished, change the Activity title } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED .equals(action)) { setProgressBarIndeterminateVisibility(false); doSetTitle(getString(R.string.select_device)); if (mNewDevicesArrayAdapter.getCount() == 0) { String noDevices = getResources().getText( R.string.none_found).toString(); mNewDevicesArrayAdapter.add(noDevices); } } } }; /* * (non-Javadoc) * * @see android.app.Activity#onActivityResult(int, int, * android.content.Intent) */ @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); switch (requestCode) { case REQUEST_ENABLE_BT: if (resultCode == RESULT_CANCELED) { finishWithCancel(); } break; } } }