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PODoes the first MapActivity instance always leak?
 

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  1. PODoes the first MapActivity instance always leak?
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    <p>While investigating memory issues in our application, it turns out that if the application Activity is a MapActivity, the first instance of it won't be finalized. Leading to other memory leak such as the view passed to setContentView.</p> <p>Does anyone notice that before?</p> <p>Here is the testing code showing that "MainActivity : 1" is not finalized whereas it is if MainActivity inherits from Activity.</p> <p>To test, one needs to change device or emulator orientation many times.</p> <pre><code> import com.google.android.maps.MapActivity; import android.app.Activity; import android.os.Bundle; import android.util.Log; public class MainActivity extends MapActivity { private static final String defaultTag = "MA"; private static final boolean isDebugModeActivate = true; private static final boolean isClassTagDisplayed = false; private static final boolean isWebModeActivate = false; static public void d(Object thiso, String message) { String tag = defaultTag + (isClassTagDisplayed == true ? "_" + thiso.getClass().getSimpleName() : ""); message = (isClassTagDisplayed == false ? thiso.getClass().getSimpleName() + " : " : "") + message; Log.d(tag, message); } public MainActivity() { counter++; uid++; id = uid; d(this, id + " tst constructor (" + counter + ")"); } private static int counter = 0; private static int uid = 0; private final int id; protected void finalize() throws Throwable { counter--; d(this, id + " tst finalize (" +counter + ") "); super.finalize(); } /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } @Override protected boolean isRouteDisplayed() { return false; } } </code></pre> <p>Thank you, David</p>
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    1. COYou are not the only one with leak problems on android: http://stackoverflow.com/questions/5111139/why-does-my-code-leak-when-switching-activities
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    2. COhttp://stackoverflow.com/questions/4218359/my-simple-listview-app-is-leaking-memory-what-am-i-doing-wrong
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    3. CO@Tyler, yes I know. Since I didn't find this specific memory leak, I guess it is good to reference it. At least this could save hours of investigations.
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