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!

score 1 · Answer 1 · answered Feb 12 '19 at 08:36

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 '19 at 08:36

Hyun I Kim

589
1
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use AssetManager to directly load assets with their paths. i tried it but don't work out of memory error ! – Android user Feb 13 '19 at 00:05
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. – Hyun I Kim Feb 13 '19 at 02:12
problem resolved, i used over 300 png with large size , thank you ! https://stackoverflow.com/questions/16433093/get-resource-identifier-resid-of-multiple-images-from-asset-or-raw-folder-to-a – Android user Feb 13 '19 at 03:33

how to add drawable all images in array in android programmatically

1 Answers1