Android MapView + Tab example

i need to have an mapview on a tab. The attached example shows how to do this if using intents. Now i want to change the zoom level of the mapview(s). How can i do this, although i'm using intents (or is there completely different solution)?

Activity code:

public class TabMapsExample extends TabActivity {    
    TabHost mTabHost;        
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);  
        Context ctx = this.getApplicationContext();         
        //tab 1
        mTabHost = getTabHost();
        TabSpec tabSpec1 = mTabHost.newTabSpec("tab_test1");
        tabSpec1.setIndicator("Map1");
        Intent i1 = new Intent(ctx, MapTabView.class);
        tabSpec1.setContent(i1);
        mTabHost.addTab(tabSpec1);          
        //tab2
        mTabHost = getTabHost();
        TabSpec tabSpec2 = mTabHost.newTabSpec("tab_test1");
        tabSpec2.setIndicator("Map2");
        Intent i2 = new Intent(ctx, MapTabView.class);
        tabSpec2.setContent(i2);
        mTabHost.addTab(tabSpec2);          
        //tab 3
        mTabHost = getTabHost();
        TabSpec tabSpec3 = mTabHost.newTabSpec("tab_test1");
        tabSpec3.setIndicator("Map");
        Intent i3 = new Intent(ctx, MapTabView.class);
        tabSpec3.setContent(i3);
        mTabHost.addTab(tabSpec3);    
    }
}

Layout code:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/maptablayout" android:orientation="vertical"
    android:layout_width="fill_parent" android:layout_height="fill_parent">
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_height="fill_parent" android:layout_width="fill_parent"
        android:background="#000000" android:orientation="vertical">
        <TextView xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="fill_parent" android:layout_height="50px"
            android:id="@+id/textview" />
        <com.google.android.maps.MapView
            android:id="@+id/mapview" android:layout_width="fill_parent"
            android:layout_height="fill_parent" android:clickable="true"
            android:apiKey="" />
    </LinearLayout>
</RelativeLayout>

thx

Asked by: John258 | Posted: 24-01-2022

Answer 1

Try to use MapController:

    MapView mapView = (MapView) findViewById(R.id.mapview);
    mapView.setBuiltInZoomControls(true);
    MapController mapController = mapView.getController();
    mapController.setZoom(10);

Answer 2

@ juri: Can an intent also receive data outside of onCreate()? (for example to set the zoomlevel dynamically during runtime and not just at creation of the intent)

Answered by: Stuart377 | Posted: 25-02-2022

Answer 3

Zooming should be possible either by activating the Zoom controls of the MapView and let your user zoom-in or out or instead programmatically by using

mapView.getController().zoomIn();

mapView.getController().zoomOut();

mapView.getController().setZoom(...);

Alternatively what you can do is to pass your intent extra data from outside. I'm just guessing now, but basically you could do something like

Intent intent = new Intent(this, MyMapActivity.class); //this is just one way of specifying it
intent.putExtra(MyMapActivity.ZOOM_LEVEL_CONSTANT, 10);
startActivity(intent);

Within the onCreate(...) of your MyMapActivity you can then read the passed data like

Bundle retrievedData = this.getIntent().getExtras();
if (retrievedData != null) {
   int zoomLevel = retrievedData.getInt(ZOOM_LEVEL_CONSTANT);
   mapView.getController.setZoom(zoomLevel);
}

Edit: To populate a tab content dynamically:

TabSpec tabSpec = tabHost.newTabSpec("Android X");
tabSpec.setContent(new TabContentFactory() { 
   public View createTabContent(String arg0) { 
       //return the view to add as content
       return theView; 
   }
});

Answered by: Aida827 | Posted: 25-02-2022

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Android MapView + Tab example

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