Change fill color on vector asset in Android Studio

Don't edit the vector assets directly. If you're using a vector drawable in an ImageButton, just choose your color in android:tint.

<ImageButton
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:id="@+id/button"
        android:src="@drawable/ic_more_vert_24dp"
        android:tint="@color/primary" />

You can do it.

BUT you cannot use @color references for colors (..lame), otherwise it will work only for L+

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24.0"
    android:viewportHeight="24.0">
<path
    android:fillColor="#FFAABB"
    android:pathData="M15.5,14h-0.79l-0.28,-0.27C15.41,12.59 16,11.11 16,9.5 16,5.91 13.09,3 9.5,3S3,5.91 3,9.5 5.91,16 9.5,16c1.61,0 3.09,-0.59 4.23,-1.57l0.27,0.28v0.79l5,4.99L20.49,19l-4.99,-5zm-6,0C7.01,14 5,11.99 5,9.5S7.01,5 9.5,5 14,7.01 14,9.5 11.99,14 9.5,14z"/>


As said in other answers, don't edit the vector drawable directly, instead you can tint in java code, like that:

    mWrappedDrawable = mDrawable.mutate();
    mWrappedDrawable = DrawableCompat.wrap(mWrappedDrawable);
    DrawableCompat.setTint(mWrappedDrawable, mColor);
    DrawableCompat.setTintMode(mWrappedDrawable, PorterDuff.Mode.SRC_IN);

And for the sake of simplicity, I have created a helper class:

import android.content.Context;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.annotation.ColorRes;
import android.support.annotation.DrawableRes;
import android.support.annotation.NonNull;
import android.support.v4.content.ContextCompat;
import android.support.v4.graphics.drawable.DrawableCompat;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;

/**
 * {@link Drawable} helper class.
 *
 * @author Filipe Bezerra
 * @version 18/01/2016
 * @since 18/01/2016
 */
public class DrawableHelper {
    @NonNull Context mContext;
    @ColorRes private int mColor;
    private Drawable mDrawable;
    private Drawable mWrappedDrawable;

    public DrawableHelper(@NonNull Context context) {
        mContext = context;
    }

    public static DrawableHelper withContext(@NonNull Context context) {
        return new DrawableHelper(context);
    }

    public DrawableHelper withDrawable(@DrawableRes int drawableRes) {
        mDrawable = ContextCompat.getDrawable(mContext, drawableRes);
        return this;
    }

    public DrawableHelper withDrawable(@NonNull Drawable drawable) {
        mDrawable = drawable;
        return this;
    }

    public DrawableHelper withColor(@ColorRes int colorRes) {
        mColor = ContextCompat.getColor(mContext, colorRes);
        return this;
    }

    public DrawableHelper tint() {
        if (mDrawable == null) {
            throw new NullPointerException("É preciso informar o recurso drawable pelo método withDrawable()");
        }

        if (mColor == 0) {
            throw new IllegalStateException("É necessário informar a cor a ser definida pelo método withColor()");
        }

        mWrappedDrawable = mDrawable.mutate();
        mWrappedDrawable = DrawableCompat.wrap(mWrappedDrawable);
        DrawableCompat.setTint(mWrappedDrawable, mColor);
        DrawableCompat.setTintMode(mWrappedDrawable, PorterDuff.Mode.SRC_IN);

        return this;
    }

    @SuppressWarnings("deprecation")
    public void applyToBackground(@NonNull View view) {
        if (mWrappedDrawable == null) {
            throw new NullPointerException("É preciso chamar o método tint()");
        }

        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            view.setBackground(mWrappedDrawable);
        } else {
            view.setBackgroundDrawable(mWrappedDrawable);
        }
    }

    public void applyTo(@NonNull ImageView imageView) {
        if (mWrappedDrawable == null) {
            throw new NullPointerException("É preciso chamar o método tint()");
        }

        imageView.setImageDrawable(mWrappedDrawable);
    }

    public void applyTo(@NonNull MenuItem menuItem) {
        if (mWrappedDrawable == null) {
            throw new NullPointerException("É preciso chamar o método tint()");
        }

        menuItem.setIcon(mWrappedDrawable);
    }

    public Drawable get() {
        if (mWrappedDrawable == null) {
            throw new NullPointerException("É preciso chamar o método tint()");
        }

        return mWrappedDrawable;
    }
}

To use just do the following:

    DrawableHelper
            .withContext(this)
            .withColor(R.color.white)
            .withDrawable(R.drawable.ic_search_24dp)
            .tint()
            .applyTo(mSearchItem);

Or:

    final Drawable drawable = DrawableHelper
            .withContext(this)
            .withColor(R.color.white)
            .withDrawable(R.drawable.ic_search_24dp)
            .tint()
            .get();

    actionBar.setHomeAsUpIndicator(drawable);