如何排序和过滤字符串数组? [英] How to sort and filter a string-array?
问题描述
我想对字符串数组中的项目列表进行排序,然后使用工具栏中的 SearchView
进行过滤。
I want to sort a list of items in a string-array and then filter them using a SearchView
in the toolbar.
这是字符串数组(每个项目都是res文件夹中可绘制的png的名称):
This is the string-array (each item is the name of a png drawable in res folder):
<string-array name="brands">
<item>facebook</item>
<item>twitter</item>
<item>instagram</item>
<item>android</item>
<item>blackberry</item>
<item>samsung</item>
<item>huawei</item>
<item>starbucks</item>
<item>motorola</item>
<item>nexus</item>
<item>lg</item>
<item>beats</item>
<item>sony</item>
<item>lenovo</item>
<item>dell</item>
<item>hp</item>
</string-array>
在 RecyclerView
适配器中,我已设置数组和 ArrayList
:
In a RecyclerView
Adapter, I have set the array and an ArrayList
:
private String[] brands;
private ArrayList<Integer> drawables;
我有一个函数可以从字符串中添加可绘制对象的ID -array
到 ArrayList
,这样我以后就可以通过简单地编写 drawables.get(position);来加载可绘制对象了。
:
And I have a function that adds the id of the drawables from the string-array
to the ArrayList
so I can later load the drawable by simply writing drawables.get(position);
:
private void loadLogo() {
drawables = new ArrayList<>();
brands = context.getResources().getStringArray(R.array.brands);
for (String extra : brands) {
int res = context.getResources().getIdentifier(extra, "drawable", context.getPackageName());
if (res != 0) {
final int brandInt = context.getResources().getIdentifier(extra, "drawable", context.getPackageName());
if (brandInt != 0)
drawables.add(brandInt);
}
}
}
我想知道的是:
- 在将项目添加到
之前如何对
品牌进行排序drawables
。 - 如何创建过滤功能来过滤
品牌
并在RecylerView
正确。
- How to sort
brands
before adding items todrawables
. - How to create a filter function to filter
brands
and make the content change in theRecylerView
properly.
我希望有人可以帮助我。
I hope someone can help me. Thanks in advance.
推荐答案
这是我的操作方式。
我创建了另一个 ArrayList< Integer>
和2个 List< Array>
,最后它们是变量:
I created another ArrayList<Integer>
and 2 List<Array>
, at the end they were the "variables:
private ArrayList<Integer> drawables, mFiltered;
private String[] brands;
private List<String> stringList, mFilteredNames;
int resId;
然后在启动适配器时,我
Then when "starting" the adapter, I sorted the string array this way:
stringList = new ArrayList<String>(Arrays.asList(brands));
Collections.sort(stringList);
loadLogo(stringList);
新的loadLogo无效是:
The new loadLogo void is:
private void loadLogo(List<String> list) {
drawables = new ArrayList<>();
for (String extra : list) {
int res = r.getIdentifier(extra, "drawable", p);
if (res != 0) {
final int brandInt = r.getIdentifier(extra, "drawable", p);
if (brandInt != 0)
drawables.add(brandInt);
}
}
}
这是我的过滤功能:
public synchronized void filter(CharSequence s) {
if (s == null || s.toString().trim().isEmpty()) {
if (mFiltered != null) {
mFiltered = null;
notifyDataSetChanged();
}
} else {
if (mFiltered != null)
mFiltered.clear();
mFiltered = new ArrayList<>();
mFilteredNames = new ArrayList<String>();
for (int i = 0; i < stringList.size(); i++) {
final String name = stringList.get(i);
if (name.toLowerCase(Locale.getDefault())
.startsWith(s.toString().toLowerCase(Locale.getDefault()))) {
mFiltered.add(drawables.get(i));
mFilteredNames.add(name);
}
}
notifyDataSetChanged();
}
并在 onBindViewHolder
RecyclerView 适配器的方法,我这样写:
And in the onBindViewHolder
method of the RecyclerView
adapter, I wrote this:
if (mFiltered != null) {
resId = mFiltered.get(position);
holder.logo.setImageResource(resId);
} else {
resId = drawables.get(position);
holder.logo.setImageResource(resId);
}
我不知道这是否是正确的方法为我的目的而努力。如果有人有更好的答案,我将不胜感激。
I don't know if it's the right way to do it, but is working for my purpose. If someone has a better answer I will be thankful.
此外,我不知道这对其他人有多大用处,因为它主要用于自定义目的,但我希望这对其他人也有帮助。
Also, I don't know how useful this could be for other people as it is mostly for a custom purpose, but I hope this helps someone else too.
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