I have 3 tabs:
- Home
- Google Map
- Settings
I have a main activity which has a TabLayout to show the 3 tabs:
public class MainActivity extends AppCompatActivity implements MyMapFragment.OnFragmentInteractionListener, SettingsFragment.OnFragmentInteractionListener {
private static final int INDEX_HOME_FRAGMENT = 0;
private static final int INDEX_MAP_FRAGMENT = 1;
private static final int INDEX_SETTINGS_FRAGMENT = 2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setText("Home"));
tabLayout.addTab(tabLayout.newTab().setText("Map"));
tabLayout.addTab(tabLayout.newTab().setText("Settings"));
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
switch(tab.getPosition()) {
case INDEX_HOME_FRAGMENT:
HomeFragment homeFragment = new HomeFragment();
transaction.replace(R.id.frame_layout, homeFragment);
// Commit the transaction
transaction.commit();
break;
case INDEX_MAP_FRAGMENT:
MyMapFragment myMapFragment = new MyMapFragment();
transaction.replace(R.id.frame_layout, myMapFragment);
// Commit the transaction
transaction.commit();
break;
case INDEX_SETTINGS_FRAGMENT:
SettingsFragment settingsFragment = new SettingsFragment();
transaction.replace(R.id.frame_layout, settingsFragment);
// Commit the transaction
transaction.commit();
break;
default:
//error occured here
Log.e("Error occured = ", " TAB_ERROR");
break;
}
}
});
// Check that the activity is using the layout version with
// the fragment_container FrameLayout
if (findViewById(R.id.frame_layout) != null) {
if (savedInstanceState != null) {
return;
}
HomeFragment homeFragment = new HomeFragment();
// Add the fragment to the 'fragment_container' FrameLayout
getSupportFragmentManager().beginTransaction()
.add(R.id.frame_layout, homeFragment ).commit();
}
}
@Override
public void onFragmentInteraction(Uri uri) {
//do nothing
}
}
This Activity also handles when a tab gets clicked. When a tab gets clicked it should show the Fragment in the FrameLayout.
This all works fine. The only problem is when I click the Maps tab, Google maps always refreshes.
I want the map to preload when the app starts so when the user clicks the map tab the map shoudl already be loaded. As well when the user goes away from the map tab and comes back it should save the map as it was previously. Currently when the user goes back to the map tab the map is reloaded and it takes again some time for it to load.
This is my map Fragment:
public class MyMapFragment extends SupportMapFragment
implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
GoogleMap mGoogleMap;
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
Marker lastOpenned = null;
@Override
public void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
if (mGoogleMap == null) {
getMapAsync(this);
}
}
@Override
public void onPause() {
super.onPause();
//stop location updates when Activity is no longer active
if (mGoogleApiClient != null) {
//LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient,this);
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
mGoogleMap = googleMap;
LatLngBounds.Builder builder = new LatLngBounds.Builder();
mGoogleMap.addMarker(new MarkerOptions()
.position(new LatLng(40.76793169992044, -73.98180484771729))
.title("San Francisco"));
mGoogleMap.addMarker(new MarkerOptions()
.position(new LatLng(41.76793169992044, -72.98180484771729))
.title("Las Vegas"));
builder.include(new LatLng(40.76793169992044, -73.98180484771729));
builder.include(new LatLng(41.76793169992044, -72.98180484771729));
LatLngBounds bounds = builder.build();
mGoogleMap.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds, 200));
mGoogleMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
public boolean onMarkerClick(Marker marker) {
return true;
}
});
//Initialize Google Play Services
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
//Location Permission already granted
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
} else {
//Request Location Permission
checkLocationPermission();
}
} else {
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
}
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onLocationChanged(Location location) {
}
private void checkLocationPermission() {
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)) {
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
new AlertDialog.Builder(getActivity())
.setTitle("Location Permission Needed")
.setMessage("This app needs the Location permission, please accept to use location functionality")
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(getActivity(),
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
}
})
.create()
.show();
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(getActivity(),
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// location-related task you need to do.
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
if (mGoogleApiClient == null) {
buildGoogleApiClient();
}
mGoogleMap.setMyLocationEnabled(true);
}
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(getActivity(), "permission denied", Toast.LENGTH_LONG).show();
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
