CODEWITHSUNDEEP
androidgridviewandroid-gridview
efpies
efpies

Reputation: 3725

Forbid GridView to load all views at once

I have about 700 items to display in the grid view.

On a Samsung Galaxy Tab 10.1 this is not a problem: it has enough memory. On a HTC Explorer the heap is overflown.

So I want to load data dynamically regarding current scroll position (N rows for screen + 5 rows as a tail). And I want to show a scrollbar which represents the position in total rows. But I don't want to draw items that I don't see.

In other words, I want to create something similar to UITableView in iOS. How can I do this?

Upvotes: 0

Views: 1096

Answers (2)

monchote
monchote

Reputation: 3470

Android Adapter works in a similar way to iOS UITableViewDataSource. You need to call

public void setAdapter (ListAdapter adapter)

on your GridView and then that Adapter will get call backs like:

public int getCount ()
public View getView (int position, View convertView, ViewGroup parent)

It's important that you reuse convertView the same way you dequeue a UITableViewCell in

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

If you do all that correctly, it will never try to load all the views at once, but only the ones currently displayed and you shouldn't have memory problems any more.

Upvotes: 2

Moritz
Moritz

Reputation: 10352

You should use a ListView that is able to reuse View objects so that you don't have to instantiate so many objects.

Upvotes: 0

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