大家好我在Myservice中有一个不断变化的值，即我在服务中onLocationChanged计算的速度和距离，我想在TextView中显示更改的值片段，我已经尝试使用broadcastReceiver进行广播并接收它，但它不适用于KitKat（API 19），
所以我试图绑定它，但它给了我错误的价值，请给我任何帮助
这是Service Class中的locationListener
public class MyLocationListener implements LocationListener {
public void onLocationChanged(final Location loc) {
Location lastLocation;
if (loc != null) {
Double d1;
Long t1;
speed = 0.0;
d1 = 0.0;
t1 = 0l;
currentLocation = loc;
lastLocation = currentLocation;
// two arrays for position and time.
positions = new Double[data_points][2];
times = new Long[data_points];
positions[counter][0] = loc.getLatitude();
positions[counter][1] = loc.getLongitude();
times[counter] = loc.getTime();
try {
// get the distance and time between the current position, and the previous position.
// using (counter - 1) % data_points doesn't wrap properly
d1 = distance(positions[counter][0], positions[counter][1], positions[(counter + (data_points - 1)) % data_points][0], positions[(counter + (data_points - 1)) % data_points][1]);
t1 = times[counter] - times[(counter + (data_points - 1)) % data_points];
} catch (NullPointerException e) {
}
if (loc.hasSpeed()) {
speed = loc.getSpeed() * 1.0; // need to * 1.0 to get into a double for some reason...
} else {
speed = d1 / t1; // m/s
}
counter = (counter + 1) % data_points;
speed = speed * 3.6d;
distanceList = new ArrayList<>();
Log.i("**********", "Location changed");
myLocation = new LatLng(loc.getLatitude(), loc.getLongitude());
if (isBetterLocation(loc, previousBestLocation)) {
loc.getLatitude();
loc.getLongitude();
for (LatLng location : cameraLocation) {
// closestCamera = location;
// smallestDistance = distance;
// Log.e("distanceTest", distance + "");
// Log.d("closestCamera" , location+"" );
// distanceList.add(CalculationByDistance(myLocation, location));
// distance = Collections.min(distanceList);
double distanceFromLastLocation = CalculationByDistance(new LatLng(lastLocation.getLatitude(), lastLocation.getLongitude()), location);
double distanceFromCurrentLocation = CalculationByDistance(new LatLng(lastLocation.getLatitude(), lastLocation.getLongitude()), location);
if (distanceFromCurrentLocation < distanceFromLastLocation) {
continue; // User is going away from location i.e location is behind user. No need to calculate distance between user and cameraLocation.
}
distanceList.add(CalculationByDistance(myLocation, location));
if (Collections.min(distanceList) == distanceFromCurrentLocation) {
// this location is nearest amongst all the cameraLocations.
smallestDistance = distanceFromCurrentLocation;
closestCamera = location;
}
}
DecimalFormat df = new DecimalFormat("###.##");
String distanceString = df.format(smallestDistance);
intent.setAction(MY_ACTION);
speedInt = speed.intValue();
intent.putExtra("speed", speed.intValue());
intent.putExtra("Latitude", loc.getLatitude());
intent.putExtra("Longitude", loc.getLongitude());
intent.putExtra("distance", distanceString);
intent.putExtra("Provider", loc.getProvider());
sendBroadcast(intent);
if (speed > 25) {
// createNotification(R.raw.camera_alert , String.valueOf(R.string.cameraAlertString));
}
sendNotification();
}
}
}
//*******************************************************************************************************
public void onProviderDisabled(String provider) {
Toast.makeText(getApplicationContext(), "Gps Disabled", Toast.LENGTH_SHORT).show();
}
public void onProviderEnabled(String provider) {
Toast.makeText(getApplicationContext(), "Gps Enabled", Toast.LENGTH_SHORT).show();
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
我想将smallestDistance和speed.intValue（）绑定到Fragment，这是一个binder类。
private final IBinder binder = new TaskBinder();
public class TaskBinder extends Binder {
public GPSService getService() {
return GPSService.this;
}
}
这里是我尝试绑定的方法
public String getDestance(){
DecimalFormat df = new DecimalFormat("###.##");
String distanceString = df.format(smallestDistance);
return distanceString ;
}
public int getSpeed(){
return speedInt ;
}
以及如何将服务连接到片段
private ServiceConnection connection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className, IBinder service) {
binder = (GPSService.TaskBinder) service;
localService = binder.getService();
isBound = true;
Log.d("connect", "onServiceConnected");
String nearestCamera = localService.getDestance();
int speed = localService.getSpeed();
Log.e("w speedd" , speed+"");
Log.e("w nearestCamera" , nearestCamera+"");
nearestCameraTxt.setText( nearestCamera+" Km/m");
carSpeedTxt.setText(speed+"\n Km/h");
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
isBound = false;
Log.d("notConnect", "onServiceNotConnected");
}
};
答案 0 :(得分：0)
在你的片段中试试这个：
GPSTracker mService; //define service class;
boolean mBound = false;
现在调用Bind服务方法：
/**
* Defines callbacks for service binding, passed to bindService()
*/
private ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className,
IBinder service) {
// We've bound to LocalService, cast the IBinder and get LocalService instance
GPSTracker.MyBinder binder = (GPSTracker.MyBinder) service;
mService = binder.getService();
mBound = true;
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
mBound = false;
}
};
使用以下方式获取价值：
if (mBound) {
// Call a method from the LocalService.
// However, if this call were something that might hang, then this request should
// occur in a separate thread to avoid slowing down the activity performance.
Double latitude = mService.getLatitude();
Double longitude = mService.getLongitude();
Toast.makeText(getActivity(), "Received", Toast.LENGTH_LONG).show();
}
在您的服务类中重写此方法：
@Override
public IBinder onBind(Intent arg0) {
return mBinder;
}
public class MyBinder extends Binder {
GPSTracker getService() { //GPSTracker is the service class name
return GPSTracker.this;
}
}
public Double getLatitude_s() {
return latitude;
}
public Double getLongitude_s() {
return longitude;
}
您还需要使用以下命令从Fragment类启动服务：
getActivity().startService(new Intent(getActivity(), GPSTracker.class));
答案 1 :(得分：0)
您可以使用EventBus在Service和Fragment之间进行通信。
在Gradle中添加依赖项：
compile 'org.greenrobot:eventbus:3.0.0'
创建将保存您的位置值的事件对象：
public class LocationUpdateEvent {
public final Location location;
public LocationUpdateEvent(final Location location) {
this.location = location;
}
public Location getLocation() {
return location;
}
}
从服务onLocationChanged()发送事件：
EventBus.getDefault().post(new LocationUpdateEvent(latLng));
订阅Fragment中的活动：
@Subscribe
public void onLocationUpdateEvent(LocationUpdateEvent event) {
int speed = event.getLocation().getSpeed()
// set speed variable to TextView as you do now in your code
};
@Override
public void onStart() {
super.onStart();
EventBus.getDefault().register(this); // it's important to register the bus
}
@Override
public void onStop() {
super.onStop();
EventBus.getDefault().unregister(this); // unregister is nessesary
}