Separate stub Magisk Manager to a module

app/src/main/java/a/a.java

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+package a;
+
+import com.topjohnwu.magisk.utils.PatchAPK;
+import com.topjohnwu.signing.BootSigner;
+
+import androidx.annotation.Keep;
+
+@Keep
+public class a extends BootSigner {
+    public static boolean patchAPK(String in, String out, String pkg) {
+        return PatchAPK.patch(in, out, pkg);
+    }
+}

app/src/main/java/a/b.java

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+package a;
+
+import com.topjohnwu.magisk.MainActivity;
+
+public class b extends MainActivity {
+    /* stub */
+}

app/src/main/java/a/c.java

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+package a;
+
+import com.topjohnwu.magisk.SplashActivity;
+
+public class c extends SplashActivity {
+    /* stub */
+}

app/src/main/java/a/e.java

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+package a;
+
+import com.topjohnwu.magisk.App;
+
+public class e extends App {
+    /* stub */
+}

app/src/main/java/a/f.java

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+package a;
+
+import com.topjohnwu.magisk.FlashActivity;
+
+public class f extends FlashActivity {
+    /* stub */
+}

app/src/main/java/a/g.java

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+package a;
+
+import android.content.Context;
+
+import com.topjohnwu.magisk.components.UpdateCheckService;
+
+import androidx.annotation.NonNull;
+import androidx.work.WorkerParameters;
+
+public class g extends w<UpdateCheckService> {
+    /* Stub */
+    public g(@NonNull Context context, @NonNull WorkerParameters workerParams) {
+        super(context, workerParams);
+    }
+}

app/src/main/java/a/h.java

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+package a;
+
+import com.topjohnwu.magisk.components.GeneralReceiver;
+
+public class h extends GeneralReceiver {
+    /* stub */
+}

app/src/main/java/a/j.java

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+package a;
+
+import com.topjohnwu.magisk.components.DownloadModuleService;
+
+public class j extends DownloadModuleService {
+    /* stub */
+}

app/src/main/java/a/m.java

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+package a;
+
+import com.topjohnwu.magisk.SuRequestActivity;
+
+public class m extends SuRequestActivity {
+    /* stub */
+}

app/src/main/java/a/w.java

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+package a;
+
+import android.content.Context;
+
+import com.topjohnwu.magisk.components.DelegateWorker;
+
+import java.lang.reflect.ParameterizedType;
+
+import androidx.annotation.NonNull;
+import androidx.work.Worker;
+import androidx.work.WorkerParameters;
+
+public abstract class w<T extends DelegateWorker> extends Worker {
+
+    /* Wrapper class to workaround Proguard -keep class * extends Worker */
+
+    private T base;
+
+    @SuppressWarnings("unchecked")
+    w(@NonNull Context context, @NonNull WorkerParameters workerParams) {
+        super(context, workerParams);
+        try {
+            base = ((Class<T>) ((ParameterizedType) getClass().getGenericSuperclass())
+                    .getActualTypeArguments()[0]).newInstance();
+            base.setActualWorker(this);
+        } catch (Exception ignored) {}
+    }
+
+    @NonNull
+    @Override
+    public Result doWork() {
+        if (base == null)
+            return Result.failure();
+        return base.doWork();
+    }
+
+    @Override
+    public void onStopped() {
+        if (base != null)
+            base.onStopped();
+    }
+}