无法扫描蓝牙设备
问题描述:
我正在开发扫描蓝牙设备并将其全部列出的应用程序。我的要求是,我必须尽快扫描设备应用程序开始..现在我的问题是,当我第一次运行应用程序,它只打开蓝牙,但不扫描设备.. 我可以看到蓝牙屏幕上的图标,但蓝牙适配器的日志猫getState()方法显示状态为STATE_OFF。 请有人帮我解决这个问题吗?无法扫描蓝牙设备
这里是我的代码片段
public class MainActivity extends Activity {
private BluetoothAdapter bluetoothAdapter;
Set<String> BTList;
ArrayAdapter<String> BTAdapter;
private ListView listView;
private BroadcastReceiver mReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
listView = (ListView) findViewById(R.id.listView1);
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null)
Toast.makeText(this, "Devices does not support Bluetooth",
Toast.LENGTH_SHORT).show();
if (!bluetoothAdapter.isEnabled())
bluetoothAdapter.enable();
if(bluetoothAdapter.isEnabled()) {
if(bluetoothAdapter.isDiscovering()) {
bluetoothAdapter.cancelDiscovery();
}
}
bluetoothAdapter.startDiscovery();
mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent
.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
BTAdapter.add(device.getName() + "\n" + device.getAddress());
BTAdapter.notifyDataSetChanged();
}
}
};
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter);
BTAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_expandable_list_item_1);
listView.setAdapter(BTAdapter);
}
@Override
protected void onDestroy() {
super.onDestroy();
//if(bluetoothAdapter != null)
// bluetoothAdapter.cancelDiscovery();
unregisterReceiver(mReceiver);
}
}
答
检查您AndroidManifest.xml文件,如果你有以下这些条目
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BLUETOOTH" />
先学习一些编码。 – AAnkit 2014-11-04 09:30:38
@Ankit y多数民众赞成在什么我想..这就是为什么我问这个.. – Akshay 2014-11-04 09:40:57
你不能只添加一切onCreate,首先学习基本知识。这个问题本身就会解决。 – AAnkit 2014-11-04 09:48:36