我有一个问题，即通过BroadcastReceiver将数据从Service发送到Android中的新Activity ....
服务：
package gavrilyuk.com.example.bleservice2;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
/**
* Created by gavriluks on 12.09.2016.
*/
public class LocationService extends Service {
public static final String BROADCAST_ACTION = "COORDS_RECEIVED";
private static final int TWO_MINUTES = 1000 * 60 * 2;
public LocationManager locationManager;
public MyLocationListener listener;
public Location previousBestLocation = null;
Intent intent;
int counter = 0;
@Override
public void onCreate()
{
super.onCreate();
intent = new Intent(BROADCAST_ACTION);
Log.d("SERVICE_CREATE", String.valueOf(intent));
}
/*
@Override
public void onStart(Intent intent, int startId)
{
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
listener = new MyLocationListener();
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 4000, 0, listener);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 4000, 0, listener);
}
*/
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
listener = new MyLocationListener();
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 4000, 0, listener);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 4000, 0, listener);
return START_STICKY;
// return super.onStartCommand(intent, flags, startId);
}
@Override
public IBinder onBind(Intent intent)
{
return null;
}
protected boolean isBetterLocation(Location location, Location currentBestLocation) {
if (currentBestLocation == null) {
// A new location is always better than no location
return true;
}
// Check whether the new location fix is newer or older
long timeDelta = location.getTime() - currentBestLocation.getTime();
boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
boolean isNewer = timeDelta > 0;
// If it's been more than two minutes since the current location, use the new location
// because the user has likely moved
if (isSignificantlyNewer) {
return true;
// If the new location is more than two minutes older, it must be worse
} else if (isSignificantlyOlder) {
return false;
}
// Check whether the new location fix is more or less accurate
int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation.getAccuracy());
boolean isLessAccurate = accuracyDelta > 0;
boolean isMoreAccurate = accuracyDelta < 0;
boolean isSignificantlyLessAccurate = accuracyDelta > 200;
// Check if the old and new location are from the same provider
boolean isFromSameProvider = isSameProvider(location.getProvider(),
currentBestLocation.getProvider());
// Determine location quality using a combination of timeliness and accuracy
if (isMoreAccurate) {
return true;
} else if (isNewer && !isLessAccurate) {
return true;
} else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
return true;
}
return false;
}
/** Checks whether two providers are the same */
private boolean isSameProvider(String provider1, String provider2) {
if (provider1 == null) {
return provider2 == null;
}
return provider1.equals(provider2);
}
@Override
public void onDestroy() {
// handler.removeCallbacks(sendUpdatesToUI);
super.onDestroy();
Log.v("STOP_SERVICE", "DONE");
locationManager.removeUpdates(listener);
}
public static Thread performOnBackgroundThread(final Runnable runnable) {
final Thread t = new Thread() {
@Override
public void run() {
try {
runnable.run();
} finally {
}
}
};
t.start();
return t;
}
public class MyLocationListener implements LocationListener
{
public void onLocationChanged(final Location loc)
{
Log.i("**************************************", "Location changed");
if(isBetterLocation(loc, previousBestLocation)) {
Log.d("LOCATION_SERVICE", String.valueOf(loc));
loc.getLatitude();
loc.getLongitude();
intent.putExtra("Latitude", loc.getLatitude());
intent.putExtra("Longitude", loc.getLongitude());
intent.putExtra("Provider", loc.getProvider());
sendBroadcast(intent);
// intent.addFlags(intent.FLAG_ACTIVITY_NEW_TASK);
// startActivity(intent);
}
}
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)
{
}
}
}
我希望从服务中接收信息的ACtivity：
package gavrilyuk.com.example.bleservice2;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
public class eceiverActivity extends AppCompatActivity {
BroadcastReceiver receiver;
IntentFilter filter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_eceiver);
Log.d("RECEIVER_ACTIVITY", "CREATE");
}
@Override
protected void onStart() {
filter = new IntentFilter();
filter.addAction(LocationService.BROADCAST_ACTION);
receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Log.d("RECEIVER_ACTIVITY", "TEST");
}
};
registerReceiver(receiver, filter);
super.onStart();
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(receiver);
}
}
修改 startService：
private static final int SPLASH_DISPLAY_LENGTH = 1000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Handler().postDelayed(new Runnable(){
@Override
public void run() {
/* Create an Intent that will start the Menu-Activity. */
// startService(new Intent(MainActivity.this, MyService.class));
startService(new Intent(MainActivity.this, LocationService.class));
finish();
}
}, SPLASH_DISPLAY_LENGTH);
}
在清单中我注册了服务和活动...... 任何人都可以帮助我，因为我无法弄清楚为什么我无法在Activity中收到信息...似乎onReceive没有启动......我无法让它工作......
已解决的问题 所以我以第二种方式解决了这个沟通问题：
private static ReceiverActivity ins = null;
protected void onCreate(Bundle savedInstanceState) {.. ins = this; ..}
public static ReceiverActivity getInstance()
{
Log.d("RECEIVER_ACTIVITY", "Instance => " + ins);
return ins;
}
public void updateTextView(final double lat, final double lng)
{
ReceiverActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
txt_coords = (TextView)findViewById(R.id.txtCoords);
txt_coords.setText("Latitude: " + lat + "\r\n" + "Longitude: " + lng);
}
});
}
答案 0 :(得分：0)
从我能看到的情况来看，您注册了广播接收器，但根本没有启动该服务，因此 onStartCommand 从未被解雇过。如果您希望从此服务的eceiverActivity接收服务数据，则需要在此活动中启动该服务，而在其他活动（MainActivity）中不。
@Override
protected void onStart() {
Intent serviceIntent = new Intent(eceiverActivity .this, LocationService.class);
startService(serviceIntent);
filter = new IntentFilter();
filter.addAction(LocationService.BROADCAST_ACTION);
receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Log.d("RECEIVER_ACTIVITY", "TEST");
}
};
registerReceiver(receiver, filter);
super.onStart();
}