In Android How To Add Internal Image With Java?

I have an image in "src\main\res\drawable\gate_logo.png" which looks like this :

My Java code looks like this :

    LinearLayout Demo_Layout = new LinearLayout(context);
Demo_Layout.setId(View.generateViewId());
//    Demo_Layout.setBackgroundColor(Color.rgb(88, 188, 218));
Demo_Layout.setBackgroundColor(Color.rgb(98, 198, 238));
Demo_Layout.setHorizontalGravity(Gravity.CENTER);
Demo_Layout.setVerticalGravity(Gravity.CENTER);
addView(Demo_Layout, LinearLayout.LayoutParams.MATCH_PARENT,328);
TextView textView = new TextView(context);
textView.setId(View.generateViewId());
textView.setGravity(Gravity.CENTER);
textView.setTextSize(20);
textView.setText(Html.fromHtml("<P><Br><big>GATE Demo</big><P>[ Graphic Access Tabular Entry ]<Br><small>An Interception-resistant Authentication System</small>"));
//    Demo_Layout.addView(textView, LinearLayout.LayoutParams.MATCH_PARENT, 328);
//    Demo_Layout.addView(textView, 600, 328);
//    int resID = getResources().getIdentifier("gate_logo.png", "drawable", "package.name");
int resID = getResources().getIdentifier("gate_logo_s.png", "drawable", context.getPackageName());
ImageView gateLogoView = new ImageView(context);
gateLogoView.setImageResource(resID);
//    gateLogoView.setScaleType(ImageView.ScaleType.CENTER_CROP);
//    gateLogoView.setScaleType(ImageView.ScaleType.FIT_XY);
gateLogoView.setLayoutParams( new ViewGroup.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
gateLogoView.setX(1);
gateLogoView.setY(1);
LinearLayout.LayoutParams vp = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
gateLogoView.setLayoutParams(vp);
gateLogoView.setImageResource(resID);
//    Demo_Layout.addView(gateLogoView, 600, 328);
Demo_Layout.addView(gateLogoView);
LinearLayout Button_Layout = new LinearLayout(context);
Button_Layout.setId(View.generateViewId());
Button_Layout.setBackgroundColor(Color.rgb(168, 98, 188));
Button_Layout.setHorizontalGravity(Gravity.CENTER);
Button_Layout.setVerticalGravity(Gravity.CENTER);
RelativeLayout.LayoutParams lp1 = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, 138);
lp1.addRule(RelativeLayout.BELOW, Demo_Layout.getId());
addView(Button_Layout, lp1);
Button Registration_Button=new Button(context);
Registration_Button.setText("Registration");
Registration_Button.setAllCaps(false);
Registration_Button.setOnClickListener(Registration_Demo_Listener);
Button_Layout.addView(Registration_Button);
Button Login_Button=new Button(context);
Login_Button.setText("Login");
Login_Button.setAllCaps(false);
Login_Button.setOnClickListener(Login_Demo_Listener);
Button_Layout.addView(Login_Button);
Button Auto_Demo_Button=new Button(context);
Auto_Demo_Button.setText("Auto Demo");
Auto_Demo_Button.setAllCaps(false);
Auto_Demo_Button.setOnClickListener(Auto_Demo_Listener);
Button_Layout.addView(Auto_Demo_Button);

I also have a half size smaller version of the image in the same directory : gate_logo_s.png

I've tried different combinations, but why is the logo image not showing up ?

Screenshot look like this :

Replace these lines:

int resID = getResources().getIdentifier("gate_logo_s.png", "drawable", context.getPackageName());
ImageView gateLogoView = new ImageView(context);
gateLogoView.setImageResource(resID);

with these:

ImageView gateLogoView = new ImageView(context);
gateLogoView.setImageResource(R.drawable.gate_logo);