I tried this piece of code from an example,but get exceptions in onResume().I can't understand what's the problem?Anyone can give suggestion for this?
My code
public class MainActivity extends Activity
implements LocationSource, LocationListener{
final int RQS_GooglePlayServices = 1;
private GoogleMap myMap;
TextView tvLocInfo;
LocationManager myLocationManager = null;
OnLocationChangedListener myLocationListener = null;
Criteria myCriteria;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvLocInfo = (TextView)findViewById(R.id.locinfo);
FragmentManager myFragmentManager = getFragmentManager();
MapFragment myMapFragment
= (MapFragment)myFragmentManager.findFragmentById(R.id.map);
myMap = myMapFragment.getMap();
myMap.setMyLocationEnabled(true);
myMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
myCriteria = new Criteria();
myCriteria.setAccuracy(Criteria.ACCURACY_FINE);
myLocationManager = (LocationManager)getSystemService(LOCATION_SERVICE);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_legalnotices:
String LicenseInfo = GooglePlayServicesUtil.getOpenSourceSoftwareLicenseInfo(
getApplicationContext());
AlertDialog.Builder LicenseDialog = new AlertDialog.Builder(MainActivity.this);
LicenseDialog.setTitle("Legal Notices");
LicenseDialog.setMessage(LicenseInfo);
LicenseDialog.show();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onResume() {
super.onResume();
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
if (resultCode == ConnectionResult.SUCCESS){
Toast.makeText(getApplicationContext(),
"isGooglePlayServicesAvailable SUCCESS",
Toast.LENGTH_LONG).show();
//Register for location updates using a Criteria, and a callback on the specified looper thread.
myLocationManager.requestLocationUpdates(
0L, //minTime
0.0f, //minDistance
myCriteria, //criteria
this, //listener
null); //looper
//Replaces the location source of the my-location layer.
myMap.setLocationSource(this);
}else{
GooglePlayServicesUtil.getErrorDialog(resultCode, this, RQS_GooglePlayServices);
}
}
@Override
protected void onPause() {
myMap.setLocationSource(null);
myLocationManager.removeUpdates(this);
super.onPause();
}
@Override
public void activate(OnLocationChangedListener listener) {
myLocationListener = listener;
}
@Override
public void deactivate() {
myLocationListener = null;
}
@Override
public void onLocationChanged(Location location) {
if (myLocationListener != null) {
myLocationListener.onLocationChanged(location);
double lat = location.getLatitude();
double lon = location.getLongitude();
tvLocInfo.setText(
"lat: " + lat + "\n" +
"lon: " + lon);
}
}
@Override
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
}
Logcat view
02-12 10:56:34.907: W/dalvikvm(1986): threadid=1: thread exiting with uncaught exception (group=0x40e55258)
02-12 10:56:34.922: E/AndroidRuntime(1986): FATAL EXCEPTION: main
02-12 10:56:34.922: E/AndroidRuntime(1986): java.lang.RuntimeException: Unable to resume activity {com.example.androidmapsv2/com.example.androidmapsv2.MainActivity}: java.lang.IllegalArgumentException: no provider_s found for criteria
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2491)
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2519)
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2033)
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.app.ActivityThread.access$600(ActivityThread.java:127)
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1179)
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.os.Handler.dispatchMessage(Handler.java:99)
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.os.Looper.loop(Looper.java:137)
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.app.ActivityThread.main(ActivityThread.java:4508)
02-12 10:56:34.922: E/AndroidRuntime(1986): at java.lang.reflect.Method.invokeNative(Native Method)
02-12 10:56:34.922: E/AndroidRuntime(1986): at java.lang.reflect.Method.invoke(Method.java:511)
02-12 10:56:34.922: E/AndroidRuntime(1986): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:809)
02-12 10:56:34.922: E/AndroidRuntime(1986): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576)
02-12 10:56:34.922: E/AndroidRuntime(1986): at dalvik.system.NativeStart.main(Native Method)
02-12 10:56:34.922: E/AndroidRuntime(1986): Caused by: java.lang.IllegalArgumentException: no provider_s found for criteria
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.os.Parcel.readException(Parcel.java:1331)
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.os.Parcel.readException(Parcel.java:1281)
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.location.ILocationManager$Stub$Proxy.requestLocationUpdates(ILocationManager.java:671)
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.location.LocationManager._requestLocationUpdates(LocationManager.java:582)
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.location.LocationManager.requestLocationUpdates(LocationManager.java:563)
02-12 10:56:34.922: E/AndroidRuntime(1986): at com.example.androidmapsv2.MainActivity.onResume(MainActivity.java:88)
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1159)
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.app.Activity.performResume(Activity.java:4553)
02-12 10:56:34.922: E/AndroidRuntime(1986): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2481)
02-12 10:56:34.922: E/AndroidRuntime(1986): ... 12 more
You should look at the Android-Developers page where you can find the declaration of the requestLocationUpdates method.
public void requestLocationUpdates (long minTime, float minDistance, Criteria criteria, LocationListener listener, Looper looper)
There you can see what Exceptions the method throws
Throws
IllegalArgumentException if criteria is null
IllegalArgumentException if listener is null
SecurityException if no suitable permission is present
If you now look at your code
myLocationManager.requestLocationUpdates(
0L, //minTime
0.0f, //minDistance
myCriteria, //criteria
this, //listener
null); //looper
and your Exception
E/AndroidRuntime: java.lang.RuntimeException: Unable to resume activity {...}:
java.lang.IllegalArgumentException: no provider_s found for criteria
^^^^^^^ this and this ^^^^
aswell as
at com.example.androidmapsv2.MainActivity.onResume(MainActivity.java:88)
you can see that the IllegalArgumentException is thrown in line 88. The reason for this is that criteria is null when requestLocationUpdates is called.
The initialization of your criteria in OnCreate is not enough.
When your OnResume is called you need to do a null check to confirm that the criteria is instantiated.