什么是增加几个观点到的LinearLayout最快的方法是什么？ [英] What's the quickest way to add several views to a LinearLayout?
问题描述
我有一个的LinearLayout 认为已经包含几个要素。我想补充了很多意见吧，编程。因为这是在滚动型，一切都将滚动。
I have a LinearLayout view that already contains several elements. I want to add a lot more Views to it, programmatically. And because this is inside a ScrollView, everything will be scrolled.
因此，我要做的就是通过我的列表，并添加我的自定义视图的新实例吧。这种自定义视图膨胀一个XML布局，并增加了一些方法。
So what I do is go through my list, and add new instances of my custom View to it. That custom view inflates a XML layout and adds a few methods.
此方法非常有效。现在的问题是，它的超慢，即使没有任何疯狂的code ...... 10个项目的列表需要大约500ms的实例。作为一个用户体验的角度来看，这是难以下咽。
This approach works well. The problem is that it's super slow, even without any crazy code... a list with 10 items takes around 500ms to instantiate. As an user experience standpoint, this is hard to swallow.
我的问题是，这是正确的/最好的方法？看来Android采取了大量的时间膨胀的布局，即使R.layout.my_list_item是超级简单。我不知道是否有一种方法，也许重用虚增的布局更多的意见，还挺缓存更复杂的分析？
My question is, is this the correct/best approach? Android seems to take a lot of time inflating the layout, even though "R.layout.my_list_item" is super simple. I wonder if there's a way to maybe to reuse "inflated" layouts for additional views, kinda caching the more complex parsing?
我已经试过这样做有一个的ListView （和适配器和包装器），它似乎要快很多。问题是，我不能用一个简单的的ListView ;我的布局是不是一个简单的列表更复杂（的的LinearLayout 本身包含额外的自定义图标，它有另一名家长有更多的意见之前，它包裹的滚动型）。
I've tried doing this with a ListView (and adapter and a wrapper) and it seems to be much faster. The problem is that I can't use a simple ListView; my layout is more complex than a simple list (the LinearLayout itself contains additional custom icons, and it has another parent with even more Views before it's wrapped by the ScrollView).
但是，有没有办法使用的适配器的的LinearLayout？那是不是比试图增加自己的看法更快？
But is there a way to use an adapter for a LinearLayout? Would that be faster than trying to add the views myself?
任何帮助是AP preciated。我很想让这个更快。
Any help is appreciated. I'd love to make this faster.
code如下：
主要活动：
// The LinearLayout that will contain everything
lineList = (LinearLayout) findViewById(R.id.lineList);
// Add a lot of items for testing
for (int i = 0; i < 10; i++) {
addListItem("Item number " + i);
}
protected void addListItem(String __title) {
MyListItem li;
li = new MyListItem(this);
li.setTitle(__title);
lineList.addView(li);
}
MyListItem：
public class MyListItem extends RelativeLayout {
protected TextView textTitle;
public MyListItem(Context __context) {
super(__context);
init();
}
public MyListItem(Context __context, AttributeSet __attrs) {
super(__context, __attrs);
init();
}
public MyListItem(Context __context, AttributeSet __attrs, int __attrsdefStyle) {
super(__context, __attrs, __attrsdefStyle);
init();
}
protected void init() {
// Inflate the XML layout
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.my_list_item, this);
// Create references
textTitle = (TextView)findViewById(R.id.textTitle);
}
public void setTitle(String __text) {
textTitle.setText(__text);
}
}
我想要做到的是这一点。考虑这个布局：
What I'm trying to accomplish is this. Consider this layout:
这布局是一个的FrameLayout （外包装盒）含的ImageView （灰色），一个的TextView （内部矩形，顶部）和的LinearLayout （内部矩形，在底部）。这的LinearLayout 矩形是一个我用动态的几个项目填充。
This layout is a FrameLayout (outer box) containing a ImageView (in gray), a TextView (inner rectangle, on top) and a LinearLayout (inner rectangle, on bottom). This LinearLayout rectangle is the one I'm dynamically populating with a few items.
在我填充它，我想最后的结果是这样的（在每一个新的矩形是一个新的 MyListItem ）实例：
After I populate it, I want the final result to be this (where every new rectangle is a new MyListItem instance):
即，一切是可滚动（背景图像，例如，被对准在顶部）。该的LinearLayout 本身不是滚动（一切如下），因此为什么的ListView ，据我所知，不会告发'T工作得很好
在我的情况。
That is, everything is scrollable (the background image, for example, is aligned on top). The LinearLayout isn't scrollable by itself (everything else follows) hence why a ListView, from what I know, wouldn't work very well
in my case.
推荐答案
3选项：
-
替换一切与一个ListView，与其他家长和自定义图标作为ListView的标头视图。 ListView的速度更快，因为它只是因为它需要他们创造的思考。
Replace everything with a ListView, with the other parent and custom icons as a header view for the ListView. ListView is faster, because it only creates Views as it needs them.
编程方式创建充气的my_list_item的内容相反，可能会更快
Programatically create the contents of my_list_item instead of inflating, might be quicker
使用 ViewStubs 可能让你加载按需意见。
Use of ViewStubs may allow you to load views on-demand.
也许它没有加载的意见，但该数据？在这种情况下，prepare在后台线程中的数据。
Maybe it isn't loading the views but the data? in which case prepare the data in a background thread.
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