Java – How to assign a drawable to an ImageView

I’m working on adding halo to cyanogenmod 11. To do this, I’m using a method to get if halo is in the active state and then assign an image to it accordingly.

First, here’s the code I’ve tried recently (I’ve tried this several times) – >

protected void updateHalo() {
mHaloActive is a boolean. mHaloButton is an ImageView
    mHaloActive = Settings.System.getInt(mContext.getContentResolver(),
            Settings.System.HALO_ACTIVE, 0) == 1;
    int resID;
    String mDrawableName;
    if (mHaloActive) {
        mDrawableName = "ic_notify_halo_pressed";
        resID = getResources().getIdentifier(mDrawableName, "drawable", getPackageName());
        mHaloButton.setImageResource(resID);
    } else {
        mDrawableName = "ic_notify_halo_normal";
        resID = getResources().getIdentifier(mDrawableName, "drawable", getPackageName());
        mHaloButton.setImageResource(resID);
    }
    if (mHaloActive) {
        if (mHalo == null) {
            LayoutInflater inflater = (LayoutInflater) mContext
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            mHalo = (Halo) inflater.inflate(R.layout.halo_trigger, null);
            mHalo.setLayerType(View.LAYER_TYPE_HARDWARE, null);
            WindowManager.LayoutParams params = mHalo.getWMParams();
            mWindowManager.addView(mHalo, params);
            mHalo.setStatusBar(this);
        }
    } else {
        if (mHalo != null) {
            mHalo.cleanUp();
            mWindowManager.removeView(mHalo);
            mHalo = null;
        }
    }
}

Now here, it says cannot find symbol: method getPackageName().

I’ve tried setImageResource(R.drawable.ic_notify_halo_pressed) several times before;
But this gave me NPE.

Then I also tried using :

Resources resources = getResources();        mHaloButton.setImageDrawable(resources.getDrawable(R.drawable.ic_notify_halo_pressed));

But this gives the error No sign found: method getResources().

I’ve also tried mHaloButton.setImageDrawable(R.drawable.ic_notify_halo_pressed); But it gives the error: setImageDrawable(android.graphics.drawable.Drawable) in android.widget.ImageView cannot applied to (int).

So I know it requires a resource ID, but how do I get it?

Please note: I’m not building an app, and this isn’t an Android Studio project. I’m trying to port halo to cyanogenmod 11.