StackOverflow2013

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plurals

PO
primarykey
Id
10993093
data
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0
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0
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2012-06-12T08:36:18.393
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2012-06-12T08:36:18.393
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2017-05-23T10:33:50.477
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10925739
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2
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text
Body
using your answer as a hint, I've searched over again, and found some good stuff on the internet, it's here (about Singleton-Activity-Service lifecycle): <a href="http://www.2linessoftware.com/2010/08/03/singletons-and-services-and-shutdowns-oh-my/" rel="nofollow noreferrer">http://www.2linessoftware.com/2010/08/03/singletons-and-services-and-shutdowns-oh-my/</a> and good related answers here: <a href="https://stackoverflow.com/questions/3826905/singletons-vs-application-context-in-android">Singletons vs. Application Context in Android?</a> I've been playing around with Singleton, and find out, that the answers are not quite correct. I tried to create singleton S in an activity A, and then goto activity B (before leaving A, I called A.finish() , and call System.gc() in B.onCreate() ) - but the S.finalize() is not called ! Here are the codes: <pre><code>public class FirstAct extends Activity implements OnClickListener { public static final String TAG = "Test_Service"; private View btChange; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); System.gc(); setContentView(R.layout.first_lay); btChange = findViewById(R.id.btChange); btChange.setOnClickListener(this); SomeSingleton.getInstance(); } @Override public void onClick(View v) { Intent i = new Intent(this,SecAct.class); startActivity(i); this.finish(); } @Override protected void onDestroy() { Log.i(TAG,"First activity is destroyed !"); super.onDestroy(); System.gc(); } } </code></pre> Second activity: <pre><code>public class SecAct extends Activity implements OnClickListener { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); System.gc(); setContentView(R.layout.first_lay); ((TextView) findViewById(R.id.tvLabel)).setText("Second activity"); findViewById(R.id.btChange).setOnClickListener(this); } @Override public void onClick(View v) { Intent i = new Intent(this,FirstAct.class); this.startActivity(i); this.finish(); } @Override protected void onDestroy() { Log.i(FirstAct.TAG,"Second activity is destroyed !"); super.onDestroy(); System.gc(); } } </code></pre> The Singleton: <pre><code>public class SomeSingleton { private static volatile SomeSingleton instance = null; private static int count = 0; private SomeSingleton() { count++; Log.i(FirstAct.TAG, "Created, instance: #" + count); } public static SomeSingleton getInstance() { if ( instance == null ) { instance = new SomeSingleton(); } return instance; } @Override protected void finalize() throws Throwable { Log.i(FirstAct.TAG, "Finalized! "); super.finalize(); } public void kill() { instance = null; } } </code></pre>
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1. This table or related slice is empty.
PostParentId
1. POMusic player without service?
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 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USCommunity
UserOwnerUserId
1. UShungson175
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