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POGoogle Maps API v2 Custom MapFragment + SimpleFragment
 

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  1. POGoogle Maps API v2 Custom MapFragment + SimpleFragment
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    <p>I need to create a simple application which contain 1. Custom MapFragment which can display current location (LocationListener?), two markers, etc. 2. Simple empty Fragments.</p> <p>The application must not use support v4 (sdk 11+) / FragmentActivity.</p> <p>Empty fragment.</p> <p>XML:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@android:color/black" &gt; &lt;/RelativeLayout&gt; </code></pre> <p>Class:</p> <pre><code>public class FirstFragment extends Fragment{ public FirstFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.first_fragment, container, false); return view; } } </code></pre> <p>Map fragment (try to make it singleton).</p> <p>XML:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;fragment xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/map" android:layout_width="match_parent" android:layout_height="match_parent" class="com.google.android.gms.maps.MapFragment"/&gt; </code></pre> <p>Class</p> <pre><code>public class ThirdMapFragment extends MapFragment { public static MapFragment instance; @Override public View onCreateView(LayoutInflater arg0, ViewGroup arg1, Bundle arg2) { View view; view = arg0.inflate(R.layout.map_fragment, arg1, false); return view; } public static MapFragment getInstance() { if (instance == null) { instance = newInstance(); } // NullPointerException in getMap() ??? // instance.getMap().addMarker(new MarkerOptions().position(new LatLng(41.1, 39))); return instance; } @Override public void onCreate(Bundle arg0) { super.onCreate(arg0); } } </code></pre> <p>Main activity:</p> <pre><code>public class ActivityMain extends Activity implements OnClickListener { FragmentManager fragmentManager; FragmentTransaction transaction; FirstFragment firstFragment; MapFragment mapFragment; // Buttons Button b4; int i = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); fragmentManager = getFragmentManager(); transaction = fragmentManager.beginTransaction(); b4 = (Button) findViewById(R.id.button4); b1.setOnClickListener(this); firstFragment = new FirstFragment(); mapFragment = ThirdMapFragment.getInstance(); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } @Override public void onClick(View v) { makeTransaction(v.getId()); } private void makeTransaction(int id) { i++; transaction = fragmentManager.beginTransaction(); if (i == 1) { transaction.replace(R.id.relativeLayout, firstFragment).commit(); } else if (i == 2) { transaction.replace(R.id.relativeLayout, secondFragment).commit(); } else { transaction.replace(R.id.relativeLayout, mapFragment).commit(); i = 0; } } } </code></pre> <p>R.id.relativeLayout - Layout in main.xml</p> <p>But I do not see the map (empty screen with zoom buttons) and how to make LocationListener? Thx.</p>
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    1. USYuriy Aizenberg
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