android get Bitmap or sound from assets

Question

I need to get Bitmap and sound from assets. I try to do like this:

BitmapFactory.decodeFile("file:///android_asset/Files/Numbers/l1.png");

And like this:

getBitmapFromAsset("Files/Numbers/l1.png");
    private Bitmap getBitmapFromAsset(String strName) {
        AssetManager assetManager = getAssets();
        InputStream istr = null;
        try {
            istr = assetManager.open(strName);
        } catch (IOException e) {
            e.printStackTrace();
        }
        Bitmap bitmap = BitmapFactory.decodeStream(istr);
        return bitmap;
    }

But I get just free space, not image.

How to do this?

score 133 · Accepted Answer · edited Aug 27 '14 at 21:26

133

public static Bitmap getBitmapFromAsset(Context context, String filePath) {
    AssetManager assetManager = context.getAssets();

    InputStream istr;
    Bitmap bitmap = null;
    try {
        istr = assetManager.open(filePath);
        bitmap = BitmapFactory.decodeStream(istr);
    } catch (IOException e) {
        // handle exception
    }

    return bitmap;
}

the path is simply your file name fx bitmap.png. if you use subfolder bitmap/ then its bitmap/bitmap.png

edited Aug 27 '14 at 21:26

Czechnology

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answered Dec 14 '11 at 08:30

Warpzit

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It's right way. But I see only free space not the picture.. what I did wrong? – Val Dec 14 '11 at 18:55
Check your picture... try to use debug and step through. Give more details, for where you picture is placed and what it is called. – Warpzit Dec 14 '11 at 21:09
Remember case sensitivity if you use subfolders – Warpzit Dec 14 '11 at 21:10
Nice code but I'd prefer to log an exception along with returning null with `Log.e("MYAPP", "exception", e);` just before `return null;` – georgiecasey Jan 12 '14 at 20:24
@georgiecasey hehe true, perhaps it should've been: // fill out whatever way you prefer. – Warpzit Jan 12 '14 at 20:29
Do you need to close the inputStream ? – android developer Feb 07 '17 at 09:59

score 18 · Answer 2 · edited Aug 19 '15 at 00:51

Use this code its working

try {
    InputStream bitmap=getAssets().open("icon.png");
    Bitmap bit=BitmapFactory.decodeStream(bitmap);
    img.setImageBitmap(bit);
} catch (IOException e1) {
    // TODO Auto-generated catch block
    e1.printStackTrace();
}

Update

While decoding Bitmap we more often meet with memory overflow exception if Image size is very big. So reading article How to display Image efficiently will help you.

score 11 · Answer 3 · answered Mar 11 '21 at 15:57

11

Short Kotlin version:

assets
   .open(name)
   .use(BitmapFactory::decodeStream)

answered Mar 11 '21 at 15:57

artem

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Jared Rummler · Answer 4 · 2016-12-13T17:53:35.773

The accepted answer never closes the InputStream. Here is a utility method for getting a Bitmap in the assets folder:

/**
 * Retrieve a bitmap from assets.
 * 
 * @param mgr
 *            The {@link AssetManager} obtained via {@link Context#getAssets()}
 * @param path
 *            The path to the asset.
 * @return The {@link Bitmap} or {@code null} if we failed to decode the file.
 */
public static Bitmap getBitmapFromAsset(AssetManager mgr, String path) {
    InputStream is = null;
    Bitmap bitmap = null;
    try {
        is = mgr.open(path);
        bitmap = BitmapFactory.decodeStream(is);
    } catch (final IOException e) {
        bitmap = null;
    } finally {
        if (is != null) {
            try {
                is.close();
            } catch (IOException ignored) {
            }
        }
    }
    return bitmap;
}

This should be the accepted answer ! You don't want not to close a stream because the kind of exception you might get later would be a native exception, meaning you will not be able to catch it :( — Amit Farkash, Dec 13 '16 at 15:42

score 3 · Answer 5 · answered Feb 08 '20 at 19:07

3

Kotlin way, with auto close of the input stream. You have to handle exceptions on your own.

private fun getBitmapFromAsset(context: Context, path: String): Bitmap =
        context.assets.open(path).use { BitmapFactory.decodeStream(it) }

answered Feb 08 '20 at 19:07

tomrozb

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Anil Singhania · Answer 6 · 2018-06-29T07:58:41.473

Method to get bitmap of image which is stored in Assets folder.

       public static Bitmap getBitmapFromAssets(Context context, String fileName, int width, int height) {
        AssetManager assetManager = context.getAssets();

        InputStream istr;
        Bitmap bitmap = null;
        try {
            final BitmapFactory.Options options = new BitmapFactory.Options();
            options.inJustDecodeBounds = true;

            istr = assetManager.open(fileName);

            // Calculate inSampleSize
            options.inSampleSize = calculateInSampleSize(options, width, height);

            // Decode bitmap with inSampleSize set
            options.inJustDecodeBounds = false;
            return BitmapFactory.decodeStream(istr, null, options);
        } catch (IOException e) {
            Log.e("hello", "Exception: " + e.getMessage());
        }

        return null;
    }

Method to resize the bitmap.

 private static int calculateInSampleSize(
            BitmapFactory.Options options, int reqWidth, int reqHeight) {
        // Raw height and width of image
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {

            final int halfHeight = height / 2;
            final int halfWidth = width / 2;

            // Calculate the largest inSampleSize value that is a power of 2 and keeps both
            // height and width larger than the requested height and width.
            while ((halfHeight / inSampleSize) >= reqHeight
                    && (halfWidth / inSampleSize) >= reqWidth) {
                inSampleSize *= 2;
            }
        }

        return inSampleSize;
    }

android get Bitmap or sound from assets

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