Retrieving data from multidimensional array from arrays.xml

Question

Suppose I'm having a three-dimensional array in my arrays.xml, something like

<string-array name="level1-1">
    <item name="id">a</item>
    <item name="id">b</item>
</string-array>
<string-array name="level1-2">
    <item name="id">c</item>
    <item name="id">d</item>
</string-array>
<array name="level1">
    <item>@array/level1-1</item>
    <item>@array/level1-2</item>
</array>
<string-array name="level2-1">
    <item name="id">e</item>
    <item name="id">f</item>
</string-array>
<string-array name="level2-2">
    <item name="id">g</item>
    <item name="id">h</item>
</string-array>
<array name="level2">
    <item>@array/level2-1</item>
    <item>@array/level2-2</item>
</array>
<array name="top_level">
    <item>@array/level1</item>
    <item>@array/level2</item> 
</array>

Now I'm looking to read it inside of my Android application. From reading similar questions here I've made a conclusion that TypedArrays are the proper way of retrieving data and while it's not hard to retrieve the whole 3-dimensional chunk as a TypedArray, it doesn't seem like there are any instruments for retrieving another TypedArrays using their IDs.

So how it is possible to retrieve a 2-dimensional "slice" out of a 3-dimensional TypedArray?

ArmDroid · Accepted Answer · 2014-09-15 09:22:17Z

1

The firs you can get your array from xml

   List<String> tablel1-1 = Array.asList(getResources().getStringArray(R.array.table1-1));
   List<String> tablel1-2 = Array.asList(getResources().getStringArray(R.array.table1-1));

   HashMap<List<String>,List<String>> level1 = new HashMap<List<String>,List<String>(table1-1,table1-2);


   List<String> tablel2-1 = Array.asList(getResources().getStringArray(R.array.table2-1));
   List<String> tablel2-2 = Array.asList(getResources().getStringArray(R.array.table2-1));

   HashMap<List<String>,List<String>> level2 = new HashMap<List<String>,List<String>(table2-1,table2-2);

Finally you can create the HashMap with two HashMaps if necessary.

    Hashmap<Hashmap<List<String>,List<String>>,Hashmap<List<String>,List<String>>> top_level = new
                 Hashmap<Hashmap<List<String>,List<String>>,Hashmap<List<String>,List<String>>>(level1,level2);

answered Sep 15, 2014 at 9:22

ArmDroid

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4 Comments

Kirill Reuk Over a year ago

While this works with the said example I'm not sure this will work with bigger arrays or more dimensions, I just tried to give the easiest example. Let's generalize: we have a TypedArray array with N dimensions and each dimension has M(i) elements where i belongs to [1..n]. We are given an index K. How do we retrieve array[K] using arrays.xml only to retrieve the array itself?

ArmDroid Over a year ago

ArrayList in Java has a get(int index) method. int is a signed 32 bit value, with a maximum value of 2,147,483,647.

ArmDroid Over a year ago

A HashMap uses an array which always has a size that is a power of two, so it can be at most 2^30 = 1073741824 elements

Kirill Reuk Over a year ago

Right, but what would you do if there were, say, 5 dimensions with 10 elements in each? I'm looking for a more universal approach.

Kirill Reuk · Accepted Answer · 2014-09-15 12:47:25Z

0

Seems like I've already figured it out by myself. Some Java code to perform the task of retrieving the "slice" like in the example shown above:

public TypedArray getSlice(TypedArray ta, long k)    {
    Resources res = getResources();

    int id = ta.getResourceId((int)k, 0);
    return res.obtainTypedArray(id);
}

As with the example given in the question the function call should be getSlice(array, K).

answered Sep 15, 2014 at 12:47

Kirill Reuk

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