1 /* 2 * Copyright (C) 2014 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 com.example.android.bluetoothchat; 18 19 import android.app.Activity; 20 import android.bluetooth.BluetoothAdapter; 21 import android.bluetooth.BluetoothDevice; 22 import android.content.BroadcastReceiver; 23 import android.content.Context; 24 import android.content.Intent; 25 import android.content.IntentFilter; 26 import android.os.Bundle; 27 import android.view.View; 28 import android.view.Window; 29 import android.widget.AdapterView; 30 import android.widget.ArrayAdapter; 31 import android.widget.Button; 32 import android.widget.ListView; 33 import android.widget.TextView; 34 35 import com.example.android.common.logger.Log; 36 37 import java.util.Set; 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 /** 48 * Tag for Log 49 */ 50 private static final String TAG = "DeviceListActivity"; 51 52 /** 53 * Return Intent extra 54 */ 55 public static String EXTRA_DEVICE_ADDRESS = "device_address"; 56 57 /** 58 * Member fields 59 */ 60 private BluetoothAdapter mBtAdapter; 61 62 /** 63 * Newly discovered devices 64 */ 65 private ArrayAdapter<String> mNewDevicesArrayAdapter; 66 67 @Override 68 protected void onCreate(Bundle savedInstanceState) { 69 super.onCreate(savedInstanceState); 70 71 // Setup the window 72 requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); 73 setContentView(R.layout.activity_device_list); 74 75 // Set result CANCELED in case the user backs out 76 setResult(Activity.RESULT_CANCELED); 77 78 // Initialize the button to perform device discovery 79 Button scanButton = (Button) findViewById(R.id.button_scan); 80 scanButton.setOnClickListener(new View.OnClickListener() { 81 public void onClick(View v) { 82 doDiscovery(); 83 v.setVisibility(View.GONE); 84 } 85 }); 86 87 // Initialize array adapters. One for already paired devices and 88 // one for newly discovered devices 89 ArrayAdapter<String> pairedDevicesArrayAdapter = 90 new ArrayAdapter<String>(this, R.layout.device_name); 91 mNewDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name); 92 93 // Find and set up the ListView for paired devices 94 ListView pairedListView = (ListView) findViewById(R.id.paired_devices); 95 pairedListView.setAdapter(pairedDevicesArrayAdapter); 96 pairedListView.setOnItemClickListener(mDeviceClickListener); 97 98 // Find and set up the ListView for newly discovered devices 99 ListView newDevicesListView = (ListView) findViewById(R.id.new_devices); 100 newDevicesListView.setAdapter(mNewDevicesArrayAdapter); 101 newDevicesListView.setOnItemClickListener(mDeviceClickListener); 102 103 // Register for broadcasts when a device is discovered 104 IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND); 105 this.registerReceiver(mReceiver, filter); 106 107 // Register for broadcasts when discovery has finished 108 filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); 109 this.registerReceiver(mReceiver, filter); 110 111 // Get the local Bluetooth adapter 112 mBtAdapter = BluetoothAdapter.getDefaultAdapter(); 113 114 // Get a set of currently paired devices 115 Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices(); 116 117 // If there are paired devices, add each one to the ArrayAdapter 118 if (pairedDevices.size() > 0) { 119 findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE); 120 for (BluetoothDevice device : pairedDevices) { 121 pairedDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress()); 122 } 123 } else { 124 String noDevices = getResources().getText(R.string.none_paired).toString(); 125 pairedDevicesArrayAdapter.add(noDevices); 126 } 127 } 128 129 @Override 130 protected void onDestroy() { 131 super.onDestroy(); 132 133 // Make sure we're not doing discovery anymore 134 if (mBtAdapter != null) { 135 mBtAdapter.cancelDiscovery(); 136 } 137 138 // Unregister broadcast listeners 139 this.unregisterReceiver(mReceiver); 140 } 141 142 /** 143 * Start device discover with the BluetoothAdapter 144 */ 145 private void doDiscovery() { 146 Log.d(TAG, "doDiscovery()"); 147 148 // Indicate scanning in the title 149 setProgressBarIndeterminateVisibility(true); 150 setTitle(R.string.scanning); 151 152 // Turn on sub-title for new devices 153 findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE); 154 155 // If we're already discovering, stop it 156 if (mBtAdapter.isDiscovering()) { 157 mBtAdapter.cancelDiscovery(); 158 } 159 160 // Request discover from BluetoothAdapter 161 mBtAdapter.startDiscovery(); 162 } 163 164 /** 165 * The on-click listener for all devices in the ListViews 166 */ 167 private AdapterView.OnItemClickListener mDeviceClickListener 168 = new AdapterView.OnItemClickListener() { 169 public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) { 170 // Cancel discovery because it's costly and we're about to connect 171 mBtAdapter.cancelDiscovery(); 172 173 // Get the device MAC address, which is the last 17 chars in the View 174 String info = ((TextView) v).getText().toString(); 175 String address = info.substring(info.length() - 17); 176 177 // Create the result Intent and include the MAC address 178 Intent intent = new Intent(); 179 intent.putExtra(EXTRA_DEVICE_ADDRESS, address); 180 181 // Set result and finish this Activity 182 setResult(Activity.RESULT_OK, intent); 183 finish(); 184 } 185 }; 186 187 /** 188 * The BroadcastReceiver that listens for discovered devices and changes the title when 189 * discovery is finished 190 */ 191 private final BroadcastReceiver mReceiver = new BroadcastReceiver() { 192 @Override 193 public void onReceive(Context context, Intent intent) { 194 String action = intent.getAction(); 195 196 // When discovery finds a device 197 if (BluetoothDevice.ACTION_FOUND.equals(action)) { 198 // Get the BluetoothDevice object from the Intent 199 BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); 200 // If it's already paired, skip it, because it's been listed already 201 if (device.getBondState() != BluetoothDevice.BOND_BONDED) { 202 mNewDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress()); 203 } 204 // When discovery is finished, change the Activity title 205 } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) { 206 setProgressBarIndeterminateVisibility(false); 207 setTitle(R.string.select_device); 208 if (mNewDevicesArrayAdapter.getCount() == 0) { 209 String noDevices = getResources().getText(R.string.none_found).toString(); 210 mNewDevicesArrayAdapter.add(noDevices); 211 } 212 } 213 } 214 }; 215 216 } 217