我有一个BroadcastReceiver，用于从BLE设备接收数据。相同的代码在Activity中工作正常，但在Fragment中工作不正常。
代码如下：
public class HomeFragment extends Fragment implements LocationListener {
Session session;
TextView textViewName;
TextView textViewSteps;
TextView textViewCalories;
TextView textViewDistance;
TextView textViewFimos;
ImageView imageViewInfo;
public static final String TAG = "StepCounter";
private UARTService mService = null;
private BluetoothDevice evolutionDevice = null;
private static final int UART_PROFILE_CONNECTED = 20;
private static final int UART_PROFILE_DISCONNECTED = 21;
private int mState = UART_PROFILE_DISCONNECTED;
MyDatabase myDatabase;
LocationManager service;
private LocationManager locationManager;
private String provider;
double latitude, longitude;
List<Byte> listBytes = new ArrayList<>();
int rowNumber = 1;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = inflater.inflate(R.layout.fragment_home, container, false);
getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
init(view);
return view;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
service_init();
}
private void init(View view) {
session = new Session(getActivity());
myDatabase = new MyDatabase(getActivity());
service = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
boolean enabled = service.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (!enabled) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null) {
System.out.println("Provider " + provider + " has been selected.");
onLocationChanged(location);
}
textViewName = view.findViewById(R.id.textViewName);
textViewSteps = view.findViewById(R.id.textViewSteps);
textViewCalories = view.findViewById(R.id.textViewCalories);
textViewDistance = view.findViewById(R.id.textViewDistance);
textViewFimos = view.findViewById(R.id.textViewFimos);
imageViewInfo = view.findViewById(R.id.imageViewInfo);
try {
textViewName.setText("Hi, " + session.getUser().getUser().getName());
} catch (Exception e) {
}
}
private void service_init() {
System.out.println("---->>>>");
Intent bindIntent = new Intent(getActivity().getApplicationContext(), UARTService.class);
getActivity().bindService(bindIntent, mServiceConnection, Context.BIND_AUTO_CREATE);
LocalBroadcastManager.getInstance(getActivity()).registerReceiver(UARTStatusChangeReceiver, makeGattUpdateIntentFilter());
}
private ServiceConnection mServiceConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder rawBinder) {
mService = ((UARTService.LocalBinder) rawBinder).getService();
Log.d(TAG, "onServiceConnected mService= " + mService);
if (!mService.initialize()) {
Log.e(TAG, "Unable to initialize Bluetooth");
getActivity().finish();
}
}
public void onServiceDisconnected(ComponentName classname) {
mService = null;
}
};
private static IntentFilter makeGattUpdateIntentFilter() {
final IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(UARTService.ACTION_GATT_CONNECTED);
intentFilter.addAction(UARTService.ACTION_GATT_DISCONNECTED);
intentFilter.addAction(UARTService.ACTION_GATT_SERVICES_DISCOVERED);
intentFilter.addAction(UARTService.ACTION_DATA_AVAILABLE);
intentFilter.addAction(UARTService.DEVICE_DOES_NOT_SUPPORT_UART);
return intentFilter;
}
private final BroadcastReceiver UARTStatusChangeReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
final Intent mIntent = intent;
//*********************//
if (action.equals(UARTService.ACTION_GATT_CONNECTED)) {
getActivity().runOnUiThread(new Runnable() {
public void run() {
System.out.println("------- Device Connected: " + evolutionDevice.getName() + " - " + evolutionDevice.getAddress());
mState = UART_PROFILE_CONNECTED;
}
});
}
//*********************//
if (action.equals(UARTService.ACTION_GATT_DISCONNECTED)) {
getActivity().runOnUiThread(new Runnable() {
public void run() {
System.out.println("------- Device Disconnected");
mState = UART_PROFILE_DISCONNECTED;
mService.close();
evolutionDevice = null;
}
});
}
//*********************//
if (action.equals(UARTService.ACTION_GATT_SERVICES_DISCOVERED)) {
mService.enableTXNotification();
}
//*********************//
if (action.equals(UARTService.ACTION_DATA_AVAILABLE)) {
final byte[] txValue = intent.getByteArrayExtra(UARTService.EXTRA_DATA);
List<Byte> byteList = Bytes.asList(txValue);
combineArrays(byteList);
}
//*********************//
if (action.equals(UARTService.DEVICE_DOES_NOT_SUPPORT_UART)) {
System.out.println("------- Device doesn't support UART. Disconnecting");
mService.disconnect();
}
}
};
@Override
public void onResume() {
super.onResume();
if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
locationManager.requestLocationUpdates(provider, 400, 1, this);
Log.d(TAG, "onResume");
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
}
@Override
public void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy()");
try {
LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(UARTStatusChangeReceiver);
} catch (Exception ignore) {
Log.e(TAG, ignore.toString());
}
getActivity().unbindService(mServiceConnection);
mService.stopSelf();
mService = null;
}
完整的代码相同，但在Activity中的一些工作正常。任何想法可能是阻止者。我是否需要在片段中执行其他操作才能从本地广播管理器接收数据？
答案 0 :(得分：1)
请尝试这种方式：
创建类BroadcastHelper
public class BroadcastHelper {
public static final String BROADCAST_EXTRA_METHOD_NAME = "INPUT_METHOD_CHANGED";
public static final String ACTION_NAME = "hossam";
public static void sendInform(Context context, String method) {
Intent intent = new Intent();
intent.setAction(ACTION_NAME);
intent.putExtra(BROADCAST_EXTRA_METHOD_NAME, method);
try {
context.sendBroadcast(intent);
} catch (Exception e) {
e.printStackTrace();
}
}
public static void sendInform(Context context, String method, Intent intent) {
intent.setAction(ACTION_NAME);
intent.putExtra(BROADCAST_EXTRA_METHOD_NAME, method);
try {
context.sendBroadcast(intent);
} catch (Exception e) {
e.printStackTrace();
}
}
}
在您的fragment中：
private Receiver receiver;
private boolean isReciverRegistered = false;
@Override
public void onResume() {
super.onResume();
if (receiver == null) {
receiver = new Receiver();
IntentFilter filter = new IntentFilter(BroadcastHelper.ACTION_NAME);
getActivity().registerReceiver(receiver, filter);
isReciverRegistered = true;
}
}
@Override
public void onDestroy() {
if (isReciverRegistered) {
if (receiver != null)
getActivity().unregisterReceiver(receiver);
}
super.onDestroy();
}
private class Receiver extends BroadcastReceiver {
@Override
public void onReceive(Context arg0, Intent arg1) {
Log.v("r", "receive " + arg1.getStringExtra(BroadcastHelper.BROADCAST_EXTRA_METHOD_NAME));
String methodName = arg1.getStringExtra(BroadcastHelper.BROADCAST_EXTRA_METHOD_NAME);
if (methodName != null && methodName.length() > 0) {
Log.v("receive", methodName);
switch (methodName) {
case "Test":
Toast.makeText(getActivity(), "message", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
}
}
然后将此代码发送给广播：
BroadcastHelper.sendInform(context, "Test");
或者，如果您要使用它发送数据，请使用：
Intent intent = new Intent("intent");
intent.putExtra("desc", desc);
intent.putExtra("name", Local_name);
intent.putExtra("code", productCode);
BroadcastHelper.sendInform(getActivity(), "Test" , intent);
答案 1 :(得分：0)
我有一个片段在做类似的事情。我将代码放在onCreateView中设置服务，并在onPause（）和onResume中进行了注册和注销。对我有用。
答案 2 :(得分：0)
可以在service_init（）中检查修改寄存器接收器吗
getActivity().registerReceiver(UARTStatusChangeReceiver, makeGattUpdateIntentFilter());
以及取消注册的接收者
getActivity().unregisterReceiver(UARTStatusChangeReceiver);