pentium10 - Page 6 - Developer IT

How to get just free heap size (not together w stack/method mem) in Java?

- by Pentium10

I want to calculate the heap usage for my app. I would like to get a procent value of Heap size only. How do I get the value in code for the current running app? EDIT The upvoted answer is NOT complete/correct. The values returned by those methods include stack and method area too, and I need to monitor only heap size. With that code I got HeapError exception when I reached 43%, so I can't use those methods to monitor just heap.

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How to schedule heavy work for later display for Listviews?

- by Pentium10

I have a listview with 200 items. I use a custom view for each row. There is a code that takes some time to calculate, and because of this the list hangs out on scrolling and loads in slow (2-3sec). I have subclassed SimpleCursorAdapter, and using Filterable and SectionIndexer. I have in mind to show initially the name of the record, and put in a thread the calculation, and will show up later when it's done. How do I push back some work, and later update the listview to include the calculated data? This should show up on fly without user interaction.

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How to remove cookies using CookieManager for a specific domain?

- by Pentium10

I know about the existince of CookieManager, but how do I remove cookies of a domain only? Can someone help me with some code fragment?

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How to start an Intent by passing some parameters to it?

- by Pentium10

I would like to pass some variables in the constructor of my ListActivity I start activity via this code: startActivity(new Intent (this, viewContacts.class)); I would like to use similar code, but to pass two strings to the constructor. How is possible?

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How to force the user to complete a task before pressing back?

- by Pentium10

I show to user a list of categories, he must choose one. How to force the user to choose before pressing back?

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How to hard define in code a matrix Integer[][]

- by Pentium10

Question is simple for an expert: Integer[][] res= new Integer[][] {.....hard code some values here on 2 dim...} How to I return here 2 rows and 3 values like this 1 2 3 4 5 6

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Do something when phone reaches a set of location?

- by Pentium10

I have a list of coordinates in the database identified as POI. For a city could be 100 records. I would like to get notified when the phone gets in 150 meters range of one of the location. The location coordinates too has an error/radius, usually 10 to 100meters. Since I don't find it good to add each location(could be hundreds) for a trigger, how can I optimize the wake-up code? Also do I have options to remove a previously setup notification from the queue?

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What options I have to show a sentence parts with different color?

- by Pentium10

I have a longer sentence 200 characters. I need to show on the screen having parts of them in different color, like highlighting search results, each with different color. The text should auto wrap with screen width, and have no break sections between parts. I meant with this that I can put sections on a new line. They will have to continue the previous section, only wrap when the screen is off. The best would be an EditText, as I need to allow editing also, but I am wondering I am able to change the color of various sentence parts, or just as a whole. What do you think, with what UI elements can I achieve this view?

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Calendar add() vs roll() when do we use it?

- by Pentium10

I know add() adds the specified (signed) amount of time to the given time field, based on the calendar's rules. And roll() adds the specified (signed) single unit of time on the given time field without changing larger fields. I can't think of an everyday usage of roll() I would do everything by add(). Can you help me out with examples when do we use roll() and when add()?

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