Allow Services to be created through Dagger.

This is a significant change that allows Services to have their
constructed injected into.

The DozeService is now labeled as injectable (thought it takes no arguments).
At least one Service has to be marked as injectable for Dagger to be happy
compiling this code.

Bug: 138787339
Test: atest SystemUITests
Change-Id: I0ec92e01dd236bcee3083c8f8744c53b7ccc92d3
Merged-In: Ib58f8763c996fbc2aea07ead56493d2d9e936f5b

packages/SystemUI/src/com/android/systemui/SystemUIApplication.java

@@ -60,16 +60,20 @@ public class SystemUIApplication extends Application implements SysUiServiceProv
     private boolean mServicesStarted;
     private boolean mBootCompleted;
     private final Map<Class<?>, Object> mComponents = new HashMap<>();
+    private ContextAvailableCallback mContextAvailableCallback;
 
     @Override
     public void onCreate() {
         super.onCreate();
+        // This line is used to setup Dagger's dependency injection and should be kept at the
+        // top of this method.
+        mContextAvailableCallback.onContextAvailable(this);
+
         // Set the application theme that is inherited by all services. Note that setting the
         // application theme in the manifest does only work for activities. Keep this in sync with
         // the theme set there.
         setTheme(R.style.Theme_SystemUI);
 
-        SystemUIFactory.createFromConfig(this);
 
         if (Process.myUserHandle().equals(UserHandle.SYSTEM)) {
             IntentFilter bootCompletedFilter = new IntentFilter(Intent.ACTION_BOOT_COMPLETED);
@@ -286,4 +290,12 @@ public class SystemUIApplication extends Application implements SysUiServiceProv
     public SystemUI[] getServices() {
         return mServices;
     }
+
+    void setContextAvailableCallback(ContextAvailableCallback callback) {
+        mContextAvailableCallback = callback;
+    }
+
+    interface ContextAvailableCallback {
+        void onContextAvailable(Context context);
+    }
 }