| /* |
| * 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.example.android.bluetoothchat; |
| |
| 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.view.View; |
| import android.view.Window; |
| import android.widget.AdapterView; |
| import android.widget.ArrayAdapter; |
| import android.widget.Button; |
| import android.widget.ListView; |
| import android.widget.TextView; |
| |
| import com.example.android.common.logger.Log; |
| |
| import java.util.Set; |
| |
| /** |
| * This Activity appears as a dialog. It lists any paired devices and |
| * devices detected in the area after discovery. 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 { |
| |
| /** |
| * Tag for Log |
| */ |
| private static final String TAG = "DeviceListActivity"; |
| |
| /** |
| * Return Intent extra |
| */ |
| public static String EXTRA_DEVICE_ADDRESS = "device_address"; |
| |
| /** |
| * Member fields |
| */ |
| private BluetoothAdapter mBtAdapter; |
| |
| /** |
| * Newly discovered devices |
| */ |
| private ArrayAdapter<String> mNewDevicesArrayAdapter; |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| |
| // Setup the window |
| requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); |
| setContentView(R.layout.activity_device_list); |
| |
| // Set result CANCELED in case the user backs out |
| setResult(Activity.RESULT_CANCELED); |
| |
| // Initialize the button to perform device discovery |
| Button scanButton = (Button) findViewById(R.id.button_scan); |
| scanButton.setOnClickListener(new View.OnClickListener() { |
| public void onClick(View v) { |
| doDiscovery(); |
| v.setVisibility(View.GONE); |
| } |
| }); |
| |
| // Initialize array adapters. One for already paired devices and |
| // one for newly discovered devices |
| ArrayAdapter<String> pairedDevicesArrayAdapter = |
| 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(pairedDevicesArrayAdapter); |
| 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); |
| |
| // 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); |
| |
| // Get the local Bluetooth adapter |
| mBtAdapter = BluetoothAdapter.getDefaultAdapter(); |
| |
| // Get a set of currently paired devices |
| Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices(); |
| |
| // If there are paired devices, add each one to the ArrayAdapter |
| if (pairedDevices.size() > 0) { |
| findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE); |
| for (BluetoothDevice device : pairedDevices) { |
| pairedDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress()); |
| } |
| } else { |
| String noDevices = getResources().getText(R.string.none_paired).toString(); |
| pairedDevicesArrayAdapter.add(noDevices); |
| } |
| } |
| |
| @Override |
| protected void onDestroy() { |
| super.onDestroy(); |
| |
| // Make sure we're not doing discovery anymore |
| if (mBtAdapter != null) { |
| mBtAdapter.cancelDiscovery(); |
| } |
| |
| // Unregister broadcast listeners |
| this.unregisterReceiver(mReceiver); |
| } |
| |
| /** |
| * Start device discover with the BluetoothAdapter |
| */ |
| private void doDiscovery() { |
| Log.d(TAG, "doDiscovery()"); |
| |
| // Indicate scanning in the title |
| setProgressBarIndeterminateVisibility(true); |
| setTitle(R.string.scanning); |
| |
| // Turn on sub-title for new devices |
| findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE); |
| |
| // 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 AdapterView.OnItemClickListener mDeviceClickListener |
| = new AdapterView.OnItemClickListener() { |
| public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) { |
| // Cancel discovery because it's costly and we're about to connect |
| 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); |
| |
| // Create the result Intent and include the MAC address |
| Intent intent = new Intent(); |
| intent.putExtra(EXTRA_DEVICE_ADDRESS, address); |
| |
| // Set result and finish this Activity |
| setResult(Activity.RESULT_OK, intent); |
| finish(); |
| } |
| }; |
| |
| /** |
| * 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); |
| setTitle(R.string.select_device); |
| if (mNewDevicesArrayAdapter.getCount() == 0) { |
| String noDevices = getResources().getText(R.string.none_found).toString(); |
| mNewDevicesArrayAdapter.add(noDevices); |
| } |
| } |
| } |
| }; |
| |
| } |