在Android中,BLE信标的发送需要通过Service和Broadcast实现。如果Android停止发送BLE信标,可能是以下原因导致:
为了解决这个问题,可以在Service中重启BLE服务,同时监听蓝牙适配器状态和进程状态变化。以下是代码示例:
public class BleService extends Service {
private BluetoothManager mBluetoothManager;
private BluetoothAdapter mBluetoothAdapter;
private Handler mHandler = new Handler();
private Runnable mRestartBleService = new Runnable() {
@Override
public void run() {
if (mBluetoothAdapter.isEnabled()) {
startBleAdvertising();// 重新发送BLE信标
} else {
mHandler.postDelayed(this, 1000);// 每秒检查一次
}
}
};
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
mBluetoothManager = (BluetoothManager) getSystemService(BLUETOOTH_SERVICE);
mBluetoothAdapter = mBluetoothManager.getAdapter();
registerReceiver(mBluetoothStateReceiver, new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));
mHandler.post(mRestartBleService);// 开始发送BLE信标
return START_STICKY;
}
@Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(mBluetoothStateReceiver);
}
private BroadcastReceiver mBluetoothStateReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
if (state == BluetoothAdapter.STATE_OFF) {
stopBleAdvertising();// 停止发送BLE信标
} else if (state == BluetoothAdapter.STATE_ON) {
mHandler.post(mRestartBleService);// 重新发送BLE信标
}
}
}
};
private void startBleAdvertising() {
// 发送BLE信标的代码
}
private void stopBleAdvertising() {
// 停止发送BLE信标的代码
}
}
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