尝试从其名称在Android中获取可绘制资源ID [英] Trying to get drawable resource ID from its name in Android

问题描述

我有一个像这样的资源文件:

I have a resource file like this:

strings.xml

<string name="category01">My Category 01</string>
<string name="category02">My Category 02</string>
<string name="category03">My Category 03</string>

<string-array name="array_category_01">
    <item name="title">@string/category01</item>
    <item name="image">@drawable/img01</item>
</string-array>

<string-array name="array_category_02">
    <item name="title">@string/category02</item>
    <item name="image">@drawable/img02</item>
</string-array>

<string-array name="array_category_03">
    <item name="title">@string/category03</item>
    <item name="image">@drawable/img03</item>
</string-array>

<string-array name="categories_array">
    <item>@array/array_category_01</item>
    <item>@array/array_category_02</item>
    <item>@array/array_category_03</item>
</string-array>

注意:@ drawable/img01，@ drawable/img02和@ drawable/img03是位于res \ drawable文件夹中的png图像

Note: @drawable/img01, @drawable/img02 and @drawable/img03 are png images locates at res\drawable folder

稍后，我将在下面的迭代中执行以检索类别-图像对:

Later I perform below iteration to retrieve category-images pairs:

    Resources res = this.context.getResources();
    TypedArray ta = res.obtainTypedArray(R.array.categories_array);
    int n = ta.length();
    String[][] array = new String[n][];
    for (int i = 0; i < n; ++i) {
        int id = ta.getResourceId(i, 0);
        if (id > 0) {
            array[i] = res.getStringArray(id);
        } else {
            // something wrong with the XML
        }
    }
    ta.recycle();

例如，最后我得到一个数组，其内容为:

so for example at the end I get an array which contents are:

array[0]
  |
  ---> [0] "My Category 01"
  |
  ---> [1] "res/drawable-xxhdpi-v4/img01.png"

array[1]
  |
  ---> [0] "My Category 02"
  |
  ---> [1] "res/drawable-xxhdpi-v4/img02.png"

array[2]
  |
  ---> [0] "My Category 03"
  |
  ---> [1] "res/drawable-xxhdpi-v4/img03.png"

这正是我所期望的，直到这里都没问题.

It is just what I am expected to get, no problem until here.

稍后在我的代码中，我需要获取上述数组中包含的类别之一的资源ID，以便设置ImageView对象的内容，因此我在下面执行(假设我想要类别2的图像) :

Later in my code, I need to get the resource ID of one of the categories contained in the above array in order for set the content of an ImageView object so I perform below (let's say I want the image for category 2):

ImageView imageView = (ImageView) rowView.findViewById(R.id.categoryicon);

int resID = this.context.getResources().getIdentifier(array[1][1] , "drawable", this.context.getPackageName());
imageView.setImageResource(resID);

我的问题是resID为零，因此未找到可绘制资源...

My problem is that resID is zero so it means drawable resource has not been found...

为了工作，我需要数组中的图像名称为img01，img02，img03，而不是"res/drawable-xxhdpi-v4/img01.png"，"res/drawable-xxhdpi" -v4/img02.png"和"res/drawable-xxhdpi-v4/img03.png"，因此，当我通过array [x] [y]将名称传递给getIdentifier时，它会起作用.

In order to work I need image names in the array to be img01, img02, img03 instead of "res/drawable-xxhdpi-v4/img01.png", "res/drawable-xxhdpi-v4/img02.png" and "res/drawable-xxhdpi-v4/img03.png" respectively so when I pass the names to getIdentifier through array[x][y] it works.

我该如何摆脱呢?

推荐答案

一个简单的解决方案是解析字符串并仅获取如下所示的图像名称.

One simple solution would be to parse the string and get only the image name as below.

String[] Image1 = array[1][1].split("/");
String s = Image1[Image1.length-1].replace(".png","").trim();

int resID = this.context.getResources().getIdentifier(s , "drawable", this.context.getPackageName());

这篇关于尝试从其名称在Android中获取可绘制资源ID的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！