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2014/10/16 ¤W¤È 08:20:56
android Programming Glossary: outerWhen exactly is it leak safe to use (anonymous) inner classes? http://stackoverflow.com/questions/10864853/when-exactly-is-it-leak-safe-to-use-anonymous-inner-classes if an instance of an inner class survives longer than its outer class an Activity . In which situations can this happen In this.. can an object of an inner class survive longer than its outer class Before we get to this let me reemphasize though you are.. has a reference to it. It doesn't even matter that the outer class has no data. This happens far more often than one might..
Android AsyncTask for Long Running Operations http://stackoverflow.com/questions/12797550/android-asynctask-for-long-running-operations inner classes can access directly any field of the outer class. Nevertheless it means the inner class will hold an invisible.. the inner class will hold an invisible reference on its outer class instance the Activity. On the long run this produces a..
How to return an array from JNI to Java? http://stackoverflow.com/questions/1610045/how-to-return-an-array-from-jni-to-java function in the example creates a number of arrays. The outer array is comprised of an 'Object' array creating with the JNI..
Android: AsyncTask recommendations: private class or public class? http://stackoverflow.com/questions/4823891/android-asynctask-recommendations-private-class-or-public-class a function in the inner class while thinking it was in the outer class and vice versa. Finally inner classes tend not to be reusable..
BroadcastReceiver as inner class http://stackoverflow.com/questions/4854807/broadcastreceiver-as-inner-class non static inner class. It has to get an instance of the outer class from somewhere e.g. by instantiating or by some other.. be instantiated automatically by the system have no such outer instance to use to create an instance of the broadcast receiver.. non static inner class. This is independent of what the outer class is Activity or not. However if you are using a receiver..
Android - New Data record is added to the wrong contact http://stackoverflow.com/questions/5151885/android-new-data-record-is-added-to-the-wrong-contact case is by using ContactsContract.RawContactsEntity an outer join of the raw_contacts table with the data table Reference..
http://stackoverflow.com/questions/5796611/dialog-throwing-unable-to-add-window-token-null-is-not-for-an-application-wi but inner classes and their implicit reference to the outer class can be equally dangerous. The second solution is to use..
Can I perform this Android query with ContentResolver.query()? (LEFT JOIN and CASE) http://stackoverflow.com/questions/6338802/can-i-perform-this-android-query-with-contentresolver-query-left-join-and-ca class but I'd imagine performing the two queries as one outer joined query would yield much better performance. Can I do this..
creating a Circular view in android http://stackoverflow.com/questions/6857505/creating-a-circular-view-in-android two circle layouts thus RelativeLayout ... RelativeLayout outer circle android layout_alignParentCenter ... RelativeLayout RelativeLayout..
EditText maxLines not working - user can still input more lines than set http://stackoverflow.com/questions/7092961/edittext-maxlines-not-working-user-can-still-input-more-lines-than-set to the maximum height of the EditText it controls the outer boundaries and not inner text lines. share improve this answer..
When to call activity context OR application context? http://stackoverflow.com/questions/7298731/when-to-call-activity-context-or-application-context Context . Rather than using MyActivity.this to get at the outer class' this they use getApplicationContext or getBaseContext..
Getting an issue while checking the dynamically generated checkbox through list view http://stackoverflow.com/questions/7738527/getting-an-issue-while-checking-the-dynamically-generated-checkbox-through-list list item. Try not to hard code the position by using the outer final position . Try setting viewHolder.checkbox.setTag position..
Why does Android prefer static classes http://stackoverflow.com/questions/3106912/why-does-android-prefer-static-classes reference all it does is cost memory. Consider this class Outer class NonStaticInner static class StaticInner public List Object.. compile it what you get will be something like this class Outer Outer public List Object foo return Arrays.asList new Outer.. it what you get will be something like this class Outer Outer public List Object foo return Arrays.asList new Outer NonStaticInner..
When exactly is it leak safe to use (anonymous) inner classes? http://stackoverflow.com/questions/10864853/when-exactly-is-it-leak-safe-to-use-anonymous-inner-classes . This is what I understood A memory leak will occur if an instance of an inner class survives longer than its outer class an Activity . In which situations can this happen In this example I suppose there is no risk of leak because there.. addressed by the other sections of this post. You asked When can an object of an inner class survive longer than its outer class Before we get to this let me reemphasize though you are right to worry about this in Activities it can cause a leak.. the Factory it will remain in memory because every single Leak has a reference to it. It doesn't even matter that the outer class has no data. This happens far more often than one might think. We don't need the creator just its creations. So we..
Android AsyncTask for Long Running Operations http://stackoverflow.com/questions/12797550/android-asynctask-for-long-running-operations in progress using an inner class of the Activity seems convenient inner classes can access directly any field of the outer class. Nevertheless it means the inner class will hold an invisible reference on its outer class instance the Activity... directly any field of the outer class. Nevertheless it means the inner class will hold an invisible reference on its outer class instance the Activity. On the long run this produces a memory leak if the AsyncTask lasts for long it keeps the activity..
How to return an array from JNI to Java? http://stackoverflow.com/questions/1610045/how-to-return-an-array-from-jni-to-java should be part of your initial question. In this case the JNI function in the example creates a number of arrays. The outer array is comprised of an 'Object' array creating with the JNI function NewObjectArray . From the perspective of JNI that's..
Android: AsyncTask recommendations: private class or public class? http://stackoverflow.com/questions/4823891/android-asynctask-recommendations-private-class-or-public-class harder to manage. I've occasionally been stung by editing a function in the inner class while thinking it was in the outer class and vice versa. Finally inner classes tend not to be reusable while separate classes can often be parameterized to..
BroadcastReceiver as inner class http://stackoverflow.com/questions/4854807/broadcastreceiver-as-inner-class have instanitated a recevier instance Yup just like any other non static inner class. It has to get an instance of the outer class from somewhere e.g. by instantiating or by some other mechanism before it can create an instances of the non static.. are invoked from intents in the manifest file that would be be instantiated automatically by the system have no such outer instance to use to create an instance of the broadcast receiver non static inner class. This is independent of what the.. to use to create an instance of the broadcast receiver non static inner class. This is independent of what the outer class is Activity or not. However if you are using a receiver as part of working with an activity you can manually instantiate..
Android - New Data record is added to the wrong contact http://stackoverflow.com/questions/5151885/android-new-data-record-is-added-to-the-wrong-contact for more details. The best approach to fetch the info in your case is by using ContactsContract.RawContactsEntity an outer join of the raw_contacts table with the data table Reference http developer.android.com reference android provider ContactsContract.RawContactsEntity.html..
http://stackoverflow.com/questions/5796611/dialog-throwing-unable-to-add-window-token-null-is-not-for-an-application-wi scope. The example above showed the case of a static reference but inner classes and their implicit reference to the outer class can be equally dangerous. The second solution is to use the Application context. This context will live as long as..
Can I perform this Android query with ContentResolver.query()? (LEFT JOIN and CASE) http://stackoverflow.com/questions/6338802/can-i-perform-this-android-query-with-contentresolver-query-left-join-and-ca and query the membership separately easy enough in my Adapter class but I'd imagine performing the two queries as one outer joined query would yield much better performance. Can I do this with the standard high level string projection and ContentResolver.query..
creating a Circular view in android http://stackoverflow.com/questions/6857505/creating-a-circular-view-in-android regardless of its size. You can then overlay the two circle layouts thus RelativeLayout ... RelativeLayout outer circle android layout_alignParentCenter ... RelativeLayout RelativeLayout inner circle android layout_alignParentCenter..
EditText maxLines not working - user can still input more lines than set http://stackoverflow.com/questions/7092961/edittext-maxlines-not-working-user-can-still-input-more-lines-than-set
When to call activity context OR application context? http://stackoverflow.com/questions/7298731/when-to-call-activity-context-or-application-context an OnClickListener for a Button in an Activity and need a Context . Rather than using MyActivity.this to get at the outer class' this they use getApplicationContext or getBaseContext to get a Context object. You only use getApplicationContext..
Getting an issue while checking the dynamically generated checkbox through list view http://stackoverflow.com/questions/7738527/getting-an-issue-while-checking-the-dynamically-generated-checkbox-through-list when you scroll and the click behavior applies to the wrong list item. Try not to hard code the position by using the outer final position . Try setting viewHolder.checkbox.setTag position before return and then use Integer buttonView.getTag instead..
Why does Android prefer static classes http://stackoverflow.com/questions/3106912/why-does-android-prefer-static-classes reference to the enclosing object. If you don't need that reference all it does is cost memory. Consider this class Outer class NonStaticInner static class StaticInner public List Object foo return Arrays.asList new NonStaticInner new StaticInner.. Arrays.asList new NonStaticInner new StaticInner When you compile it what you get will be something like this class Outer Outer public List Object foo return Arrays.asList new Outer NonStaticInner this new StaticInner class Outer NonStaticInner.. new NonStaticInner new StaticInner When you compile it what you get will be something like this class Outer Outer public List Object foo return Arrays.asList new Outer NonStaticInner this new StaticInner class Outer NonStaticInner private..
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