Refactor Ad Unit ID handling for Native Ads

This commit introduces the following changes:

-   Adds a new XML file `admob_ids.xml` to store AdMob ad unit IDs.
-   Adds a `nativeAdUnitId` attribute to the `NativeAdBannerView` custom view.
-   Updates `NativeAdBannerView` to use the `nativeAdUnitId` attribute or a fallback ID.
-   Updates `NativeAdLoader` to accept an optional `adUnitId` parameter and use a fallback if not provided.
-   Sets `nativeAdUnitId` for `NativeAdBannerView` instances in various layouts:
    -   `lesson_description_section.xml`
    -   `fragment_about.xml`
    -   `activity_support.xml`
    -   `fragment_code.xml`
    -   `activity_help.xml`
    -   `fragment_no_code.xml`
    -   `fragment_same_code.xml`
    -   `fragment_home.xml`
-   Updates `AndroidStudioFragment.java` to set the `nativeAdUnitId` programmatically for an ad view.
-   Updates `AppOpenAdManager.java` to load the ad unit ID from `admob_ids.xml`.
-   Removes ad unit ID string resources from `untranslatable_strings.xml` as they are now in `admob_ids.xml`.

Author: MihaiCristianCondrea

app/src/main/java/com/d4rk/androidtutorials/java/ads/managers/AppOpenAd.java

@@ -13,6 +13,7 @@
 import androidx.lifecycle.OnLifecycleEvent;
 import androidx.lifecycle.ProcessLifecycleOwner;
 
+import com.d4rk.androidtutorials.java.R;
 import com.d4rk.androidtutorials.java.ads.AdUtils;
 import com.google.android.gms.ads.AdError;
 import com.google.android.gms.ads.AdRequest;
@@ -83,15 +84,16 @@ public interface OnShowAdCompleteListener {
     }
 
     private static class AppOpenAdManager {
-        private static final String AD_UNIT_ID = "ca-app-pub-5294151573817700/9123330876";
         private final Application application;
+        private final String adUnitId;
         private com.google.android.gms.ads.appopen.AppOpenAd appOpenAd = null;
         private boolean isLoadingAd = false;
         private boolean isShowingAd = false;
         private long loadTime = 0;
 
         public AppOpenAdManager(Application application) {
             this.application = application;
+            this.adUnitId = application.getString(R.string.app_open_ad_unit_id);
         }
 
         private void loadAd(Context context) {
@@ -101,7 +103,7 @@ private void loadAd(Context context) {
             }
             isLoadingAd = true;
             AdRequest request = new AdRequest.Builder().build();
-            com.google.android.gms.ads.appopen.AppOpenAd.load(context, AD_UNIT_ID, request, new AppOpenAdLoadCallback() {
+            com.google.android.gms.ads.appopen.AppOpenAd.load(context, adUnitId, request, new AppOpenAdLoadCallback() {
                 @Override
                 public void onAdLoaded(@NonNull com.google.android.gms.ads.appopen.AppOpenAd ad) {
                     appOpenAd = ad;

app/src/main/java/com/d4rk/androidtutorials/java/ads/managers/NativeAdLoader.java

@@ -1,6 +1,7 @@
 package com.d4rk.androidtutorials.java.ads.managers;
 
 import android.content.Context;
+import android.text.TextUtils;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -30,26 +31,39 @@ public class NativeAdLoader {
     private static final String TAG = "NativeAdLoader";
 
     public static void load(@NonNull Context context, @NonNull ViewGroup container) {
-        load(context, container, R.layout.ad_home_banner_large, new AdRequest.Builder().build(), null);
+        load(context, container, R.layout.ad_home_banner_large, null, new AdRequest.Builder().build(), null);
     }
 
     public static void load(@NonNull Context context, @NonNull ViewGroup container, @LayoutRes int layoutRes) {
-        load(context, container, layoutRes, new AdRequest.Builder().build(), null);
+        load(context, container, layoutRes, null, new AdRequest.Builder().build(), null);
     }
 
     public static void load(@NonNull Context context,
                             @NonNull ViewGroup container,
                             @LayoutRes int layoutRes,
                             @androidx.annotation.Nullable AdListener listener) {
-        load(context, container, layoutRes, new AdRequest.Builder().build(), listener);
+        load(context, container, layoutRes, null, new AdRequest.Builder().build(), listener);
     }
 
     public static void load(@NonNull Context context,
                             @NonNull ViewGroup container,
                             @LayoutRes int layoutRes,
                             @NonNull AdRequest adRequest,
                             @androidx.annotation.Nullable AdListener listener) {
-        AdLoader.Builder builder = new AdLoader.Builder(context, context.getString(R.string.native_ad_banner_unit_id))
+        load(context, container, layoutRes, null, adRequest, listener);
+    }
+
+    public static void load(@NonNull Context context,
+                            @NonNull ViewGroup container,
+                            @LayoutRes int layoutRes,
+                            @androidx.annotation.Nullable String adUnitId,
+                            @NonNull AdRequest adRequest,
+                            @androidx.annotation.Nullable AdListener listener) {
+        String resolvedAdUnitId = TextUtils.isEmpty(adUnitId)
+                ? context.getString(R.string.native_ad_fallback_unit_id)
+                : adUnitId;
+
+        AdLoader.Builder builder = new AdLoader.Builder(context, resolvedAdUnitId)
                 .forNativeAd(nativeAd -> {
                     LayoutInflater inflater = LayoutInflater.from(context);
                     NativeAdView adView = (NativeAdView) inflater.inflate(layoutRes, container, false);

app/src/main/java/com/d4rk/androidtutorials/java/ads/views/NativeAdBannerView.java

@@ -2,12 +2,14 @@
 
 import android.content.Context;
 import android.content.res.TypedArray;
+import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.widget.FrameLayout;
 
 import androidx.annotation.LayoutRes;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.annotation.StringRes;
 
 import com.d4rk.androidtutorials.java.R;
 import com.d4rk.androidtutorials.java.ads.managers.NativeAdLoader;
@@ -21,6 +23,8 @@
 public class NativeAdBannerView extends FrameLayout {
 
     private int layoutRes = R.layout.ad_home_banner_large;
+    @Nullable
+    private String adUnitId;
 
     public NativeAdBannerView(@NonNull Context context) {
         super(context);
@@ -38,9 +42,15 @@ public NativeAdBannerView(@NonNull Context context, @Nullable AttributeSet attrs
     }
 
     private void init(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
+        adUnitId = context.getString(R.string.native_ad_fallback_unit_id);
+
         if (attrs != null) {
             try (TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.NativeAdBannerView, defStyleAttr, 0)) {
                 layoutRes = a.getResourceId(R.styleable.NativeAdBannerView_nativeAdLayout, R.layout.ad_home_banner_large);
+                CharSequence adUnitValue = a.getText(R.styleable.NativeAdBannerView_nativeAdUnitId);
+                if (!TextUtils.isEmpty(adUnitValue)) {
+                    adUnitId = adUnitValue.toString();
+                }
             }
         }
     }
@@ -58,10 +68,22 @@ public void loadAd(@NonNull AdRequest request) {
     }
 
     public void loadAd(@NonNull AdRequest request, @Nullable AdListener listener) {
-        NativeAdLoader.load(getContext(), this, layoutRes, request, listener);
+        NativeAdLoader.load(getContext(), this, layoutRes, adUnitId, request, listener);
     }
 
     public void setNativeAdLayout(@LayoutRes int layoutRes) {
         this.layoutRes = layoutRes;
     }
+
+    public void setNativeAdUnitId(@Nullable String adUnitId) {
+        if (TextUtils.isEmpty(adUnitId)) {
+            this.adUnitId = getContext().getString(R.string.native_ad_fallback_unit_id);
+        } else {
+            this.adUnitId = adUnitId;
+        }
+    }
+
+    public void setNativeAdUnitId(@StringRes int adUnitIdRes) {
+        setNativeAdUnitId(getContext().getString(adUnitIdRes));
+    }
 }

app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/AndroidStudioFragment.java

@@ -372,6 +372,7 @@ public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int
                         ViewGroup.LayoutParams.MATCH_PARENT,
                         ViewGroup.LayoutParams.WRAP_CONTENT));
                 adView.setNativeAdLayout(R.layout.ad_android_studio_list);
+                adView.setNativeAdUnitId(R.string.native_ad_lessons_list_unit_id);
                 return new AdHolder(adView);
             } else if (viewType == TYPE_CATEGORY) {
                 View view = LayoutInflater.from(parent.getContext())

app/src/main/res/layout/activity_help.xml

@@ -50,6 +50,7 @@
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginVertical="2dp"
+                app:nativeAdUnitId="@string/native_ad_help_unit_id"
                 app:nativeAdLayout="@layout/ad_help" />
 
             <com.google.android.material.card.MaterialCardView

app/src/main/res/layout/activity_support.xml

@@ -123,6 +123,7 @@
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginTop="16dp"
+                app:nativeAdUnitId="@string/native_ad_support_unit_id"
                 app:nativeAdLayout="@layout/ad_support" />
 
             <com.google.android.gms.ads.AdView

app/src/main/res/layout/fragment_about.xml

@@ -167,6 +167,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_marginTop="2dp"
+            app:nativeAdUnitId="@string/native_ad_about_unit_id"
             app:nativeAdLayout="@layout/ad_about" />
 
         <com.airbnb.lottie.LottieAnimationView

app/src/main/res/layout/fragment_code.xml

@@ -36,5 +36,6 @@
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
+        app:nativeAdUnitId="@string/native_ad_code_example_unit_id"
         app:nativeAdLayout="@layout/ad_lesson_code" />
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/fragment_home.xml

@@ -150,6 +150,7 @@
                 android:layout_marginHorizontal="16dp"
                 android:layout_marginTop="16dp"
                 android:layout_marginBottom="16dp"
+                app:nativeAdUnitId="@string/native_ad_home_unit_id"
                 app:nativeAdLayout="@layout/ad_home_banner_large" />
 
             <androidx.appcompat.widget.LinearLayoutCompat
@@ -218,6 +219,7 @@
                 android:id="@+id/small_banner_ad"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
+                app:nativeAdUnitId="@string/native_ad_home_unit_id"
                 app:nativeAdLayout="@layout/ad_home_banner_small" />
 
             <com.airbnb.lottie.LottieAnimationView

app/src/main/res/layout/fragment_no_code.xml

@@ -33,5 +33,6 @@
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
+        app:nativeAdUnitId="@string/native_ad_code_example_unit_id"
         app:nativeAdLayout="@layout/ad_lesson_code" />
 </androidx.constraintlayout.widget.ConstraintLayout>