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POGoogle Maps Android API v2 SupportMapFragment memory leak
 

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  1. POGoogle Maps Android API v2 SupportMapFragment memory leak
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    <p>Using 2 simple activities. First Activity which only holds a button to start the 2nd Activity which holds the map:</p> <p>Main Activity:</p> <pre><code>public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void goToMap(View view){ //This is just the onClick method for the button Intent intent=new Intent( this, BigMapTest.class); startActivity(intent); } </code></pre> <p>The map activity:</p> <pre><code>public class BigMapTest extends FragmentActivity { SupportMapFragment mapFragment; GoogleMap map; @Override protected void onCreate(Bundle arg0) { // TODO Auto-generated method stub super.onCreate(arg0); setContentView(R.layout.travel_diary_big_map); mapFragment=(SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.big_map); map=mapFragment.getMap(); } </code></pre> <p>The XML Layout for the map activity:</p> <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" &gt; &lt;fragment android:id="@+id/big_map" android:layout_width="fill_parent" android:layout_height="fill_parent" class="com.google.android.gms.maps.SupportMapFragment" /&gt; </code></pre> <p></p> <p>Now when I run this code, pressing the button to move to the Activity with the map, and pressing back to get to the first activity...then repeating the process, I can see the heap increasing in size each time, until it reaches it's limits and then it starts clamping. If you mess around a bit more with map(i.e. zooming) I can get an OOM Exception at this point.</p> <blockquote> <p>01-25 16:10:13.931: D/dalvikvm(21578): GC_FOR_ALLOC freed 1898K, 7% free 45859K/49187K, paused 204ms<br/> 01-25 16:10:14.671: I/dalvikvm-heap(21578): Clamp target GC heap from 52.724MB to 48.000MB<br/> 01-25 16:10:14.671: D/dalvikvm(21578): GC_CONCURRENT freed 2534K, 6% free 46554K/49187K, paused 3ms+14ms<br/> 01-25 16:10:15.372: I/dalvikvm-heap(21578): Clamp target GC heap from 52.979MB to 48.000MB<br/> 01-25 16:10:15.382: D/dalvikvm(21578): GC_CONCURRENT freed 2273K, 5% free 46815K/49187K, paused 3ms+15ms<br/> 01-25 16:10:15.622: I/dalvikvm-heap(21578): Clamp target GC heap from 52.604MB to 48.000MB<br/> 01-25 16:10:15.622: D/dalvikvm(21578): GC_FOR_ALLOC freed 657K, 6% free 46431K/49187K, paused 202ms<br/> 01-25 16:10:16.203: I/dalvikvm-heap(21578): Clamp target GC heap from 52.959MB to 48.000MB<br/> 01-25 16:10:16.203: D/dalvikvm(21578): GC_FOR_ALLOC freed 1469K, 5% free 46796K/49187K, paused 217ms<br/> 01-25 16:10:16.203: I/dalvikvm-heap(21578): Forcing collection of SoftReferences for 278744-byte allocation<br/> 01-25 16:10:16.423: I/dalvikvm-heap(21578): Clamp target GC heap from 52.952MB to 48.000MB<br/> 01-25 16:10:16.423: D/dalvikvm(21578): GC_BEFORE_OOM freed 9K, 5% free 46786K/49187K, paused 219ms<br/> 01-25 16:10:16.423: E/dalvikvm-heap(21578): Out of memory on a 278744-byte allocation.<br/></p> </blockquote> <p>Any suggestions/help would be appreciated.</p>
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    1. COUse MAT to determine the source of your leak.
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    2. COUsing MAT and then searching for the object with the biggest retained size (which keeps growing with every cycle) then using path to GC roots excluding weak references I have reached the following: class maps.by.a @ 0x414f7fa8 System Class. - But i don't know what to do next.
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    3. COIt seems something is accumilating in a Hashmap: The class "maps.by.a", loaded by "dalvik.system.PathClassLoader @ 0x413de740", occupies 12,923,112 (57.78%) bytes. The memory is accumulated in one instance of "java.util.HashMap$HashMapEntry[]" loaded by "<system class loader>". Keywords java.util.HashMap$HashMapEntry[] maps.by.a dalvik.system.PathClassLoader @ 0x413de740
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