Getting Bitmap from Vector Drawable

Getting Bitmap from vector drawable

Checked on API: 17, 21, 23

public static Bitmap getBitmapFromVectorDrawable(Context context, int drawableId) {
    Drawable drawable = ContextCompat.getDrawable(context, drawableId);
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
        drawable = (DrawableCompat.wrap(drawable)).mutate();
    }

    Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
            drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);

    return bitmap;
}

UPDATE:

Project gradle:

dependencies {
        classpath 'com.android.tools.build:gradle:2.2.0-alpha5'
    }

Module gradle:

android {
    compileSdkVersion 23
    buildToolsVersion '23.0.3'
    defaultConfig {
        minSdkVersion 16
        targetSdkVersion 23
        vectorDrawables.useSupportLibrary = true
    }
    ...
}
...

How to get a Bitmap from VectorDrawable

First of all, you cannot cast VectorDrawable to BitmapDrawable. They don't have a parent-child relationship. They both are direct subclasses of Drawable class.

Now, to get a bitmap from drawable, you will need to create a Bitmap from the drawable metadata.

Probably something like this in a separate method,

try {
    Bitmap bitmap;

    bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);

    Canvas canvas = new Canvas(bitmap);
    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);
    return bitmap;
} catch (OutOfMemoryError e) {
    // Handle the error
    return null;
}

I hope this helps.

How to convert a Drawable to a Bitmap?

This converts a BitmapDrawable to a Bitmap.

Drawable d = ImagesArrayList.get(0);  
Bitmap bitmap = ((BitmapDrawable)d).getBitmap();

How to load an image from drawable and convert to a bitmap

The following method should work fine:

public static Bitmap getBitmapFromVectorDrawable(Context context, int drawableId) {
    Drawable drawable = ContextCompat.getDrawable(context, drawableId);
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
        drawable = (DrawableCompat.wrap(drawable)).mutate();
    }
    Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
            drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);
    return bitmap;
}

build.gradle (project-level)

dependencies {
        classpath 'com.android.tools.build:gradle:2.2.0-alpha5'
    }

build.gradle (app-level)

android {
    compileSdkVersion 23
    buildToolsVersion '23.0.3'
    defaultConfig {
        minSdkVersion 16
        targetSdkVersion 23
        vectorDrawables.useSupportLibrary = true
    }
    ...
}
...

Or, you can use android-ktx in Kotlin too like this which works for any subclass of Drawable:

build.gradle

dependencies {
    implementation 'androidx.core:core-ktx:1.0.0-alpha1'
}

Then use Drawable#toBitmap() like this:

val bitmap = AppCompatResources.getDrawable(requireContext(), drawableId).toBitmap() 

VectorDrawable to Bitmap: Bitmap.setHasAlpha(boolean)' on a null object reference

change

android:width="16000dp"
android:height="16000dp"

to

android:width="24dp"
android:height="24dp"

don't need to chagne:

android:viewportWidth="16000"
android:viewportHeight="16000">

Decoding bitmap from Drawable Resource Id is giving null

Please check if you are using Vector drawable or normal png/jpeg image as a drawable, it gives null value if you try to decode vector drawable.

Use this code if you are trying to decode Vector drawable

public static Bitmap getBitmapFromVectorDrawable(Context context, int drawableId) {
Drawable drawable = ContextCompat.getDrawable(context, drawableId);
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
    drawable = (DrawableCompat.wrap(drawable)).mutate();
}

Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
        drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);

return bitmap;
}

Also make sure if you have vector support enable in your app gradle

vectorDrawables.useSupportLibrary = true

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