CODEWITHSUNDEEP
javaandroidandroid-drawable
DeapSoup
DeapSoup

Reputation: 43

Iterating over drawables in Android

In Android, I have only found answers as to how to open a single specific Drawable from MainActivity.java, but not how to iterate over each Drawable from res/drawables. The Drawables names do not follow any patterns (e.g. being numbered from 0 to 25), so the answer suggested here sadly doesn't solve my problem. Does anyone know how to do the latter?

Thank you in advance :)

Upvotes: 2

Views: 1891

Answers (3)

Matt Styles
Matt Styles

Reputation: 97

The easiest way to do it is to put the names of your drawables in a String array:

String[] symbols = {"first_img", "second_img", "third_img", "fourth_img"};

Then iterate over them like this (I put the images into a GridLayout):

for(String symbol : symbols) {
    int id = getResources().getIdentifier(symbol, "drawable", getPackageName());

    ImageView img = new ImageView(this);
    LinearLayout.LayoutParams imgParams = new LinearLayout.LayoutParams(300, 300);
    imgParams.setMargins(30, 30, 30, 30);
    img.setLayoutParams(imgParams);
    img.setBackgroundResource(id);
    symbolGrid.addView(img);
}

Upvotes: 1

user8959091
user8959091

Reputation:

If you want to iterate through drawables that have similar names like: image1, image2, ..., image10 you can do it like this: 

    for (int i = 0; i < 10; i++) {
        int id = getResources().getIdentifier("image" + i, "drawable", getPackageName());
        Drawable d = ContextCompat.getDrawable(this, id);
        // your code here
    }

Upvotes: 1

M Moersalin
M Moersalin

Reputation: 290

First, put your drawables into an arrays

<array name="dashboard_item_menu_drawable">
    <item>@drawable/ic_file_green</item>
    <item>@drawable/ic_email_green</item>
    <item>@drawable/ic_linear_scale_green</item>
    <item>@drawable/ic_undo_green</item>
    <item>@drawable/ic_check_circle_green</item>
    <item>@drawable/ic_archive_green</item>
</array>

Then, iterate your array drawables

val icons = ArrayList<Int>()
val arr = resources.obtainTypedArray(R.array.dashboard_item_menu_drawable)
(0 until arr.length()).forEach {
    // get resource id of each drawable
    val icon = arr.getResourceId(it, -1)
    icons.add(icon)
}

Next, recycles resource

arr.recycle()

Then you can use your drawable

iconView.setImageDrawable(ContextCompat.getDrawable(this, icons[index]))

Upvotes: 2

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