自定义游标适配器多次调用bindView

Question

我已经忍受了几个月和几个月的问题(但现在我正在进行性能调整).但是,我现在迫切需要知道为什么我的适配器感觉有必要bindView在记录上运行多达4次.

我有一个自定义游标适配器填充gridview.

一些调试显示正在发生的事情:

03-08 14:46:47.980: I/AdapterCursorGrid(20724): newView()
03-08 14:46:48.470: I/AdapterCursorGrid(20724): bindView()
03-08 14:46:48.570: I/AdapterCursorGrid(20724): --------------------------
03-08 14:46:48.570: I/AdapterCursorGrid(20724): bindView() Record Id: 1
03-08 14:46:48.570: I/AdapterCursorGrid(20724): bindView() Cursor Position: 0
03-08 14:46:48.570: I/AdapterCursorGrid(20724): bindView() View Type: 0
03-08 14:46:48.570: I/AdapterCursorGrid(20724): --------------------------
03-08 14:46:48.600: D/AdapterCursorGrid(20724): bindView() Avatar empty...
03-08 14:46:48.690: D/AdapterCursorGrid(20724): bindView() Picture creation...
03-08 14:46:49.490: I/AdapterCursorGrid(20724): bindView()
03-08 14:46:49.501: I/AdapterCursorGrid(20724): --------------------------
03-08 14:46:49.501: I/AdapterCursorGrid(20724): bindView() Record Id: 1
03-08 14:46:49.501: I/AdapterCursorGrid(20724): bindView() Cursor Position: 0
03-08 14:46:49.501: I/AdapterCursorGrid(20724): bindView() View Type: 0
03-08 14:46:49.501: I/AdapterCursorGrid(20724): --------------------------
03-08 14:46:49.521: D/AdapterCursorGrid(20724): bindView() Avatar empty...
03-08 14:46:49.521: D/AdapterCursorGrid(20724): bindView() Picture creation...
03-08 14:46:50.320: I/AdapterCursorGrid(20724): newView()
03-08 14:46:51.170: I/AdapterCursorGrid(20724): bindView()
03-08 14:46:51.180: I/AdapterCursorGrid(20724): --------------------------
03-08 14:46:51.180: I/AdapterCursorGrid(20724): bindView() Record Id: 1
03-08 14:46:51.180: I/AdapterCursorGrid(20724): bindView() Cursor Position: 0
03-08 14:46:51.190: I/AdapterCursorGrid(20724): bindView() View Type: 0
03-08 14:46:51.190: I/AdapterCursorGrid(20724): --------------------------
03-08 14:46:51.190: D/AdapterCursorGrid(20724): bindView() Avatar empty...
03-08 14:46:51.200: D/AdapterCursorGrid(20724): bindView() Picture creation...
03-08 14:46:51.870: I/AdapterCursorGrid(20724): bindView()
03-08 14:46:51.896: I/AdapterCursorGrid(20724): --------------------------
03-08 14:46:51.896: I/AdapterCursorGrid(20724): bindView() Record Id: 1
03-08 14:46:51.900: I/AdapterCursorGrid(20724): bindView() Cursor Position: 0
03-08 14:46:51.900: I/AdapterCursorGrid(20724): bindView() View Type: 0
03-08 14:46:51.900: I/AdapterCursorGrid(20724): --------------------------
03-08 14:46:51.900: D/AdapterCursorGrid(20724): bindView() Avatar empty...
03-08 14:46:51.900: D/AdapterCursorGrid(20724): bindView() Picture creation...

"Avatar empty ..."和"Picture creation ..."只是调试,告诉我它正在处理和更新2个特定的ImageViews.

为什么bindView运行这么多次？这是什么原因,我该怎么做才能解决这个问题？

从逻辑上讲,我希望bindView运行一次(并且每次更新适配器一次),我错了想到这个吗？

Answer 1

操作系统可以bindView多次调用,以便它可以正确地测量和布置列表.这不是一个错误,就像它必须的那样.这与滚动的平滑性一起,是bindView实现需要尽可能高效的原因.您可以在Android开发者页面上详细介绍一些很好的提示和技巧.

Answer 2

我还发现bindView被调用的次数比预期的多.我的ListView高度设置为wrap_content.将其更改为match_parent后,呼叫数量急剧减少.

感谢这个解决方案得到了这个问题的答案Custom CursorAdapater的bindView调用了77次......我做错了什么？