Error reason:
You can't refresh the UI thread in a subthread in Android
resolvent:
//Refresh the UI using the runOnUiThread method
runOnUiThread(new Runnable() {
@Override
public void run() {
//refresh UI
}
});
common problem:
When calling locationmanager to get the current location information and upload it in real time, the reason for this error is that locationmanager needs to be used in the main thread. The following methods are recommended:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//upload location messages
Button btnUploadGPS = (Button)findViewById(R.id.btn_upload_gps);
if (btnUploadGPS != null){
btnUploadGPS .setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
uploadGPS();
}
});
}
}
private void uploadGPS(){
final LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
2000,
(float) 0.01,
new LocationListener() {
@Override
public void onLocationChanged(Location location) {
asyncUploadGPS(location);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
asyncUploadGPS(locationManager.getLastKnownLocation(provider));
}
@Override
public void onProviderDisabled(String provider) {
asyncUploadGPS(null);
}
}
);
}
private void asyncUploadGPS(final Location currentLocation) {
new Thread(new Runnable() {
@Override
public void run() {
//upload loacation messages
}
}).start();
}
