Why my Map fragment return null?

Question

I have seen this and similar posts.

To me it seems that I do everything correctly.

Still,

SupportMapFragment mapFrag = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map);`

returns NULL.

activty_map.xml

<FrameLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >


<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.SupportMapFragment"
/>

<Button 
android:id="@+id/startgeo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Set Geo"
android:background="@android:color/transparent"
android:layout_gravity="right"/>

</FrameLayout>

Code in my Activity:

    setContentView(R.layout.activty_map);
    SupportMapFragment mapFrag = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map); //RETURNS NULL !!!
    map = mapFrag.getMap();

I would think that getMap() might return null, sure that is not it? — cYrixmorten, May 15 '14 at 15:00
@nikis do I need to add the fragment in such a circumstance? — Lisa Anne, May 15 '14 at 15:20

score 1 · Accepted Answer · edited May 23 '17 at 12:27

1

As per mentioned by some other devs, google maps take some while to load. That is why you need to call your map initialization code after some delay (lets say 500ms).

For example:

setContentView(R.layout.activty_map);

new Handler().postDelayed(new Runnable() {
    @Override
    public void run() {
        SupportMapFragment mapFrag = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map); //should'nt be null after 500ms
        map = mapFrag.getMap();
    }
}, 500);

Moreover, I would suggest you to rely on onResume method for confirm completion of loading.

edited May 23 '17 at 12:27

Community

1
1

answered May 15 '14 at 15:04

waqaslam

67,549
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calling in in onResume() did not help :-(( – Lisa Anne May 15 '14 at 15:20
try `onResumeFragments` – waqaslam May 15 '14 at 15:20
The idea is that map loading takes time and its reference should only be initiated once the loading is done. It is the same as we bind Services in android - which is asynchronous. – waqaslam May 15 '14 at 15:23
neither, NULL again :-(( – Lisa Anne May 15 '14 at 15:23
did you try adding delay by using `Handler`? paste some more code – waqaslam May 15 '14 at 15:24

score 1 · Answer 2 · answered May 15 '14 at 15:07

1

Rather than just posting it using some arbitrary delay you can be sure the fragment will be available in in onResumeFragments, #http://developer.android.com/reference/android/support/v4/app/FragmentActivity.html#onResumeFragments()

answered May 15 '14 at 15:07

Matt Accola

4,090
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Why my Map fragment return null?

2 Answers2