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   1 /*
   2  * Copyright (C) 2009 The Android Open Source Project
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.altusmetrum.AltosDroid;
  18
  19 import java.util.Set;
  20
  21 import android.app.Activity;
  22 import android.bluetooth.BluetoothAdapter;
  23 import android.bluetooth.BluetoothDevice;
  24 import android.content.BroadcastReceiver;
  25 import android.content.Context;
  26 import android.content.Intent;
  27 import android.content.IntentFilter;
  28 import android.os.Bundle;
  29 import android.view.View;
  30 import android.view.Window;
  31 import android.view.View.OnClickListener;
  32 import android.widget.AdapterView;
  33 import android.widget.ArrayAdapter;
  34 import android.widget.Button;
  35 import android.widget.ListView;
  36 import android.widget.TextView;
  37 import android.widget.AdapterView.OnItemClickListener;
  38
  39 /**
  40  * This Activity appears as a dialog. It lists any paired devices and
  41  * devices detected in the area after discovery. When a device is chosen
  42  * by the user, the MAC address of the device is sent back to the parent
  43  * Activity in the result Intent.
  44  */
  45 public class DeviceListActivity extends Activity {
  46
  47         // Return Intent extra
  48         public static final String EXTRA_DEVICE_ADDRESS = "device_address";
  49         public static final String EXTRA_DEVICE_NAME = "device_name";
  50
  51         // Member fields
  52         private BluetoothAdapter mBtAdapter;
  53         private ArrayAdapter<String> mPairedDevicesArrayAdapter;
  54         private ArrayAdapter<String> mNewDevicesArrayAdapter;
  55
  56         @Override
  57         protected void onCreate(Bundle savedInstanceState) {
  58                 super.onCreate(savedInstanceState);
  59
  60                 // Setup the window
  61                 requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
  62                 setContentView(R.layout.device_list);
  63
  64                 // Set result CANCELED incase the user backs out
  65                 setResult(Activity.RESULT_CANCELED);
  66
  67                 // Initialize the button to perform device discovery
  68                 Button scanButton = (Button) findViewById(R.id.button_scan);
  69                 scanButton.setOnClickListener(new OnClickListener() {
  70                         public void onClick(View v) {
  71                                 doDiscovery();
  72                                 v.setVisibility(View.GONE);
  73                         }
  74                 });
  75
  76                 // Initialize array adapters. One for already paired devices and
  77                 // one for newly discovered devices
  78                 mPairedDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name);
  79                 mNewDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name);
  80
  81                 // Find and set up the ListView for paired devices
  82                 ListView pairedListView = (ListView) findViewById(R.id.paired_devices);
  83                 pairedListView.setAdapter(mPairedDevicesArrayAdapter);
  84                 pairedListView.setOnItemClickListener(mDeviceClickListener);
  85
  86                 // Find and set up the ListView for newly discovered devices
  87                 ListView newDevicesListView = (ListView) findViewById(R.id.new_devices);
  88                 newDevicesListView.setAdapter(mNewDevicesArrayAdapter);
  89                 newDevicesListView.setOnItemClickListener(mDeviceClickListener);
  90
  91                 // Register for broadcasts when a device is discovered
  92                 IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
  93                 this.registerReceiver(mReceiver, filter);
  94
  95                 // Register for broadcasts when discovery has finished
  96                 filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
  97                 this.registerReceiver(mReceiver, filter);
  98
  99                 // Get the local Bluetooth adapter
 100                 mBtAdapter = BluetoothAdapter.getDefaultAdapter();
 101
 102                 // Get a set of currently paired devices
 103                 Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices();
 104
 105                 // If there are paired devices, add each one to the ArrayAdapter
 106                 if (pairedDevices.size() > 0) {
 107                         findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE);
 108                         for (BluetoothDevice device : pairedDevices)
 109                                 if (device.getName().startsWith("TeleBT"))
 110                                         mPairedDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
 111
 112                 } else {
 113                         String noDevices = getResources().getText(R.string.none_paired).toString();
 114                         mPairedDevicesArrayAdapter.add(noDevices);
 115                 }
 116         }
 117
 118         @Override
 119         protected void onDestroy() {
 120                 super.onDestroy();
 121
 122                 // Make sure we're not doing discovery anymore
 123                 if (mBtAdapter != null) {
 124                         mBtAdapter.cancelDiscovery();
 125                 }
 126
 127                 // Unregister broadcast listeners
 128                 this.unregisterReceiver(mReceiver);
 129         }
 130
 131         /**
 132         * Start device discover with the BluetoothAdapter
 133         */
 134         private void doDiscovery() {
 135                 AltosDebug.debug("doDiscovery()");
 136
 137                 // Indicate scanning in the title
 138                 setProgressBarIndeterminateVisibility(true);
 139                 setTitle(R.string.scanning);
 140
 141                 // Turn on sub-title for new devices
 142                 findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE);
 143
 144                 // If we're already discovering, stop it
 145                 if (mBtAdapter.isDiscovering()) {
 146                         mBtAdapter.cancelDiscovery();
 147                 }
 148
 149                 // Request discover from BluetoothAdapter
 150                 mBtAdapter.startDiscovery();
 151         }
 152
 153         // The on-click listener for all devices in the ListViews
 154         private OnItemClickListener mDeviceClickListener = new OnItemClickListener() {
 155                 public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) {
 156                         // Cancel discovery because it's costly and we're about to connect
 157                         mBtAdapter.cancelDiscovery();
 158
 159                         // Get the device MAC address, which is the last 17 chars in the View
 160                         String info = ((TextView) v).getText().toString();
 161                         String address = info.substring(info.length() - 17);
 162
 163                         int newline = info.indexOf('\n');
 164
 165                         String name = null;
 166                         if (newline > 0)
 167                                 name = info.substring(0, newline);
 168                         else
 169                                 name = info;
 170
 171                         AltosDebug.debug("******* selected item '%s'", info);
 172
 173                         // Create the result Intent and include the MAC address
 174                         Intent intent = new Intent();
 175                         intent.putExtra(EXTRA_DEVICE_ADDRESS, address);
 176                         intent.putExtra(EXTRA_DEVICE_NAME, name);
 177
 178                         // Set result and finish this Activity
 179                         setResult(Activity.RESULT_OK, intent);
 180                         finish();
 181                 }
 182         };
 183
 184         // The BroadcastReceiver that listens for discovered devices and
 185         // changes the title when discovery is finished
 186         private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
 187                 @Override
 188                 public void onReceive(Context context, Intent intent) {
 189                         String action = intent.getAction();
 190
 191                         // When discovery finds a device
 192                         if (BluetoothDevice.ACTION_FOUND.equals(action)) {
 193
 194                                 /* Get the BluetoothDevice object from the Intent
 195                                  */
 196                                 BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
 197
 198                                 /* If it's already paired, skip it, because it's been listed already
 199                                  */
 200                                 if (device != null && device.getBondState() != BluetoothDevice.BOND_BONDED)
 201                                 {
 202                                         String  name = device.getName();
 203                                         if (name != null && name.startsWith("TeleBT"))
 204                                                 mNewDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
 205                                 }
 206
 207                         /* When discovery is finished, change the Activity title
 208                          */
 209                         } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
 210                                 setProgressBarIndeterminateVisibility(false);
 211                                 setTitle(R.string.select_device);
 212                                 if (mNewDevicesArrayAdapter.getCount() == 0) {
 213                                         String noDevices = getResources().getText(R.string.none_found).toString();
 214                                         mNewDevicesArrayAdapter.add(noDevices);
 215                                 }
 216                         }
 217                 }
 218         };
 219
 220 }