how to add drawable all images in array in android programmatically

Question

I have a code that let me use images in drawable folder, but all the images are stored in array by name-

I wanna load them programmatically by a function and store them in array

this is the array :

private int[] theBitmapIds = { R.drawable.elefant_001, R.drawable.elefant_002, R.drawable.elefant_003, R.drawable.elefant_004,
R.drawable.elefant_005, R.drawable.elefant_006, R.drawable.elefant_007,
R.drawable.elefant_008, R.drawable.elefant_009, R.drawable.elefant_010,
R.drawable.elefant_011, R.drawable.elefant_012, R.drawable.elefant_013,
R.drawable.elefant_014, R.drawable.elefant_015, R.drawable.elefant_016,
R.drawable.elefant_017, R.drawable.elefant_018, R.drawable.elefant_019,
R.drawable.elefant_020, R.drawable.elefant_021,R.drawable.elefant_022,
R.drawable.elefant_022, R.drawable.elefant_023,R.drawable.elefant_024,
R.drawable.elefant_025, R.drawable.elefant_026, R.drawable.elefant_027,
R.drawable.elefant_028, R.drawable.elefant_029, R.drawable.elefant_030,
R.drawable.elefant_031, R.drawable.elefant_032, R.drawable.elefant_033,
R.drawable.elefant_034, R.drawable.elefant_035, R.drawable.elefant_036,
R.drawable.elefant_037, R.drawable.elefant_038, R.drawable.elefant_039,
R.drawable.elefant_040};

I changed it by the function

public int [] theBitmapIds( ) {
    Field[] ID_Fields = R.drawable.class.getFields();
    int[] theBitmapIds = new int[ID_Fields.length];
    for (int i = 0; i < ID_Fields.length; i++) {
        try {
            theBitmapIds[i] = ID_Fields[i].getInt( null );
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }
    return  theBitmapIds;
}

private int[] theBitmapIds=theBitmapIds( );

but when I call the array in other function, it still has nothing in it

public Bitmap getBitmap(int width, int height, int index) {
        Bitmap b = Bitmap.createBitmap(width, height,
                Bitmap.Config.ARGB_8888);
        b.eraseColor(0xFFFFFFFF);
        Canvas c = new Canvas(b);
        Drawable d = getResources().getDrawable(theBitmapIds[index]);

        int margin = 1;
        int border = 1;
        Rect r = new Rect(margin, margin, width - margin, height - margin);

        int imageWidth = r.width() - (border * 2);
        int imageHeight = imageWidth * d.getIntrinsicHeight()
                / d.getIntrinsicWidth();
        if (imageHeight > r.height() - (border * 2)) {
            imageHeight = r.height() - (border * 2);
            imageWidth = imageHeight * d.getIntrinsicWidth()
                    / d.getIntrinsicHeight();
        }

I am confused especially I'm a noob in java. How I can make this code work by editing the function or by change this line of code:

private int[] theBitmapIds=theBitmapIds( );

or

Drawable d = getResources().getDrawable(theBitmapIds[index]);

Someone help me pls!

Hyun I Kim · Accepted Answer · 2019-02-12 08:36:20Z

1

You can use AssetManager to directly load assets with their paths.

You can get its instance by calling context.getAssets().

With it's open() method, you'll be able to get an InputStream for that asset.

Then you can use BitmapFactory.decodeStream() to convert it into Bitmap.

answered Feb 12, 2019 at 8:36

Hyun I Kim

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3 Comments

Android user Over a year ago

use AssetManager to directly load assets with their paths. i tried it but don't work out of memory error !

Hyun I Kim Over a year ago

You will get out of memory error if you load a bitmap that is too large for the device to handle. Large means the size of the image file in bytes. I don't know the size of your image, but you have many bitmaps to load at once which might throw that error. Best way is to use smaller images.

Android user Over a year ago

problem resolved, i used over 300 png with large size , thank you ! stackoverflow.com/questions/16433093/…

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