Kelvin Kellner Kelvin Kellner - 4 months ago 28
Android Question

Making a Snackbar Without a View?

I want to show a snackbar as soon as the user opens the Google Maps activity, but the thing is that there's no views in the activity to use as the first parameter of the activity (in the

findViewById()
of
Snackbar.make()
). What do I put there?
Here's the java class code:

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

private GoogleMap mMap;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);

// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}

@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setBuildingsEnabled(true);
mMap.getUiSettings().setZoomControlsEnabled(true);
float cameraZoom = 17;
LatLng location = new LatLng(43.404032, -80.478184);
mMap.addMarker(new MarkerOptions().position(location).title("49 McIntyre Place #18, Kitchener, ON N2R 1G3"));
CameraUpdateFactory.newLatLngZoom(location, cameraZoom);
Snackbar.make(findViewById(/*WHAT DO I PUT HERE?*/), "Click the pin for more options", Snackbar.LENGTH_LONG).show();
}
}


Also, here is the activity xml code:

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="ca.davesautoservice.davesautoservice.MapsActivity" />


And lastly, here's the stacktrace error:

08-03 11:42:21.333 3901-3901/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: ca.davesautoservice.davesautoservice, PID: 3901
java.lang.NullPointerException
at android.support.design.widget.Snackbar.<init>(Snackbar.java:183)
at android.support.design.widget.Snackbar.make(Snackbar.java:215)
at ca.davesautoservice.davesautoservice.MapsActivity.onMapReady(MapsActivity.java:48)
at com.google.android.gms.maps.SupportMapFragment$zza$1.zza(Unknown Source)
at com.google.android.gms.maps.internal.zzo$zza.onTransact(Unknown Source)
at android.os.Binder.transact(Binder.java:361)
at xz.a(:com.google.android.gms.DynamiteModulesB:82)
at maps.ad.u$5.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5333)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)
at dalvik.system.NativeStart.main(Native Method)


Thanks for the help! :)

Answer

I see some options... Not sure which one can fix your issue.

Simpliest

SupportMapFragment extends class android.support.v4.app.Fragment. This way, it has a method getView()

Snackbar.make(mapFragment.getView(), "Click the pin for more options", Snackbar.LENGTH_LONG).show();

Find Root View

From this answer, there's a way to get the root view via:

getWindow().getDecorView().getRootView()

So, maybe, you can do:

Snackbar.make(getWindow().getDecorView().getRootView(), "Click the pin for more options", Snackbar.LENGTH_LONG).show();

Add a dummy LinearLayout to get the View

Honestly, I'm not sure if this solution is possible. I'm not sure if you can add a LinearLayout above the Maps fragment... I think it is OK but since I never work with Maps API before, I'm not sure.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/dummy_layout_for_snackbar"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <fragment 
        xmlns:map="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="ca.davesautoservice.davesautoservice.MapsActivity" />
</LinearLayout>

and then:

Snackbar.make(findViewById(R.id.dummy_layout_for_snackbar), "Click the pin for more options", Snackbar.LENGTH_LONG).show();