Remove obsolete alternative injection method

The previous commit replaced the IInterface instance (the "input"
service) by the InputManager instance (retrieved by
InputManager.getInstance()).

Both define an "injectInputEvent" method, but the alternate version
(probably) does not concern the InputManager.

This reverts commit b7a06278fe.

server/src/main/java/com/genymobile/scrcpy/wrappers/InputManager.java

@@ -14,24 +14,18 @@ public final class InputManager {
     public static final int INJECT_INPUT_EVENT_MODE_WAIT_FOR_RESULT = 1;
     public static final int INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH = 2;
 
-    private final IInterface manager;
+    private final android.hardware.input.InputManager manager;
     private Method injectInputEventMethod;
-    private boolean alternativeInjectInputEventMethod;
 
     private static Method setDisplayIdMethod;
 
-    public InputManager(IInterface manager) {
+    public InputManager(android.hardware.input.InputManager manager) {
         this.manager = manager;
     }
 
     private Method getInjectInputEventMethod() throws NoSuchMethodException {
         if (injectInputEventMethod == null) {
-            try {
+            injectInputEventMethod = manager.getClass().getMethod("injectInputEvent", InputEvent.class, int.class);
-                injectInputEventMethod = manager.getClass().getMethod("injectInputEvent", InputEvent.class, int.class);
-            } catch (NoSuchMethodException e) {
-                injectInputEventMethod = manager.getClass().getMethod("injectInputEvent", InputEvent.class, int.class, int.class);
-                alternativeInjectInputEventMethod = true;
-            }
         }
         return injectInputEventMethod;
     }
@@ -39,10 +33,6 @@ public final class InputManager {
     public boolean injectInputEvent(InputEvent inputEvent, int mode) {
         try {
             Method method = getInjectInputEventMethod();
-            if (alternativeInjectInputEventMethod) {
-                // See <https://github.com/Genymobile/scrcpy/issues/2250>
-                return (boolean) method.invoke(manager, inputEvent, mode, 0);
-            }
             return (boolean) method.invoke(manager, inputEvent, mode);
         } catch (InvocationTargetException | IllegalAccessException | NoSuchMethodException e) {
             Ln.e("Could not invoke method", e);

server/src/main/java/com/genymobile/scrcpy/wrappers/ServiceManager.java

@@ -4,6 +4,7 @@ import android.annotation.SuppressLint;
 import android.os.IBinder;
 import android.os.IInterface;
 
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 
 @SuppressLint("PrivateApi,DiscouragedPrivateApi")
@@ -56,7 +57,13 @@ public final class ServiceManager {
 
     public InputManager getInputManager() {
         if (inputManager == null) {
-            inputManager = new InputManager(getService("input", "android.hardware.input.IInputManager"));
+            try {
+                Method getInstanceMethod = android.hardware.input.InputManager.class.getDeclaredMethod("getInstance");
+                android.hardware.input.InputManager im = (android.hardware.input.InputManager) getInstanceMethod.invoke(null);
+                inputManager = new InputManager(im);
+            } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
+                throw new AssertionError(e);
+            }
         }
         return inputManager;
     }