How to set a bitmap from resource

Question

This seems simple, I am trying to set a bitmap image but from the resources, I have within the application in the drawable folder.

bm = BitmapFactory.decodeResource(null, R.id.image);

Is this correct?

score 804 · Accepted Answer · edited Apr 04 '14 at 12:20

804

Assuming you are calling this in an Activity class

Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.image);

The first parameter, Resources, is required. It is normally obtainable in any Context (and subclasses like Activity).

edited Apr 04 '14 at 12:20

Pratik Butani

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answered Feb 10 '11 at 09:27

xandy

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I am getting null value of bitmap ,can u say me why i am getting null – gautam Nov 17 '17 at 07:02
yes i'm getting the same issue, null value of the bitmap. – Er.Rohit Sharma Mar 20 '18 at 12:00
3

I got the issue. I was trying to convert vector drawable into bitmap. So here is the cod to convert vector drawable into bitmap. – Er.Rohit Sharma Mar 20 '18 at 12:12
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If **not** calling from an Activity class (e.g., if called from a data class) you could try: val myBitmap = BitmapFactory.decodeResource(Resources.getSystem(), R.drawable.your_image) <—Kotlin – Bikeboy Dec 21 '18 at 15:06
I was gettin null value of Bitmap because I was using a vector resource (it you use a `.png` for example it works) – dnhyde Feb 17 '22 at 16:32

score 40 · Answer 2 · edited Nov 17 '15 at 21:22

40

Try this

This is from sdcard

ImageView image = (ImageView) findViewById(R.id.test_image);
Bitmap bMap = BitmapFactory.decodeFile("/sdcard/test2.png");
image.setImageBitmap(bMap);

This is from resources

Bitmap bMap = BitmapFactory.decodeResource(getResources(), R.drawable.icon);

edited Nov 17 '15 at 21:22

Bengt

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answered Feb 10 '11 at 09:43

Parag Chauhan

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score 9 · Answer 3 · answered Feb 10 '11 at 09:32

If the resource is showing and is a view, you can also capture it. Like a screenshot:

View rootView = ((View) findViewById(R.id.yourView)).getRootView();
rootView.setDrawingCacheEnabled(true);
rootView.layout(0, 0, rootView.getWidth(), rootView.getHeight());
rootView.buildDrawingCache();

Bitmap bm = Bitmap.createBitmap(rootView.getDrawingCache());

rootView.setDrawingCacheEnabled(false);

This actually grabs the whole layout but you can alter as you wish.

score 3 · Answer 4 · edited Oct 31 '19 at 05:06

If you have declare a bitmap object and you want to display it or store this bitmap object. but first you have to assign any image , and you may use the button click event, this code will only demonstrate that how to store the drawable image in bitmap Object.

Bitmap contact_pic = BitmapFactory.decodeResource(
                           v.getContext().getResources(),
                           R.drawable.android_logo
                     );

Now you can use this bitmap object, whether you want to store it, or to use it in google maps while drawing a pic on fixed latitude and longitude, or to use some where else

score 0 · Answer 5 · answered Nov 26 '14 at 07:37

just replace this line

bm = BitmapFactory.decodeResource(null, R.id.image);

with

Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.YourImageName);

I mean to say just change null value with getResources() If you use this code in any button or Image view click event just append getApplicationContext() before getResources()..

score 0 · Answer 6 · answered May 13 '20 at 11:40

Using this function you can get Image Bitmap. Just pass image url

 public Bitmap getBitmapFromURL(String strURL) {
      try {
        URL url = new URL(strURL);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.connect();
        InputStream input = connection.getInputStream();
        Bitmap myBitmap = BitmapFactory.decodeStream(input);
        return myBitmap;
      } catch (IOException e) {
        e.printStackTrace();
        return null;
      }
 }

How to set a bitmap from resource

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