要使用Android的蓝牙发现设备功能,并确保广播接收器的方法被调用,您可以按照以下解决方法操作。
public class BluetoothReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// 蓝牙设备已被发现
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// 处理设备
}
}
}
public class MainActivity extends AppCompatActivity {
private BluetoothReceiver bluetoothReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 创建广播接收器实例
bluetoothReceiver = new BluetoothReceiver();
}
@Override
protected void onResume() {
super.onResume();
// 注册广播接收器
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(bluetoothReceiver, filter);
// 开始蓝牙设备发现
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
bluetoothAdapter.startDiscovery();
}
@Override
protected void onPause() {
super.onPause();
// 取消注册广播接收器
unregisterReceiver(bluetoothReceiver);
// 停止蓝牙设备发现
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter.isDiscovering()) {
bluetoothAdapter.cancelDiscovery();
}
}
}
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
// 设备不支持蓝牙
} else if (!bluetoothAdapter.isEnabled()) {
// 蓝牙已关闭,尝试打开
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
} else {
// 蓝牙已打开
}
通过按照以上步骤操作,您应该能够在蓝牙设备发现时成功调用广播接收器的方法。