Add an unified input capture interface

app/src/main/java/com/limelight/binding/input/capture/InputCaptureManager.java

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+package com.limelight.binding.input.capture;
+
+import android.app.Activity;
+
+import com.limelight.LimeLog;
+import com.limelight.binding.input.evdev.EvdevCaptureProvider;
+import com.limelight.binding.input.evdev.EvdevListener;
+
+public class InputCaptureManager {
+    public static InputCaptureProvider getInputCaptureProvider(Activity activity, EvdevListener rootListener) {
+        /*if (AndroidCaptureProvider.isCaptureProviderSupported()) {
+            LimeLog.info("Using Android N+ native mouse capture");
+            return new AndroidCaptureProvider();
+        }
+        else*/ if (ShieldCaptureProvider.isCaptureProviderSupported()) {
+            LimeLog.info("Using NVIDIA mouse capture extension");
+            return new ShieldCaptureProvider(activity);
+        }
+        else if (EvdevCaptureProvider.isCaptureProviderSupported()) {
+            LimeLog.info("Using Evdev mouse capture");
+            return new EvdevCaptureProvider(activity, rootListener);
+        }
+        else {
+            LimeLog.info("Mouse capture not available");
+            return new NullCaptureProvider();
+        }
+    }
+}

app/src/main/java/com/limelight/binding/input/capture/InputCaptureProvider.java

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+package com.limelight.binding.input.capture;
+
+import android.view.MotionEvent;
+
+public abstract class InputCaptureProvider {
+    public abstract void enableCapture();
+    public abstract void disableCapture();
+    public void destroy() {}
+
+    public boolean eventHasRelativeMouseAxes(MotionEvent event) {
+        return false;
+    }
+
+    public float getRelativeAxisX(MotionEvent event) {
+        return 0;
+    }
+
+    public float getRelativeAxisY(MotionEvent event) {
+        return 0;
+    }
+}

app/src/main/java/com/limelight/binding/input/capture/NullCaptureProvider.java

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+package com.limelight.binding.input.capture;
+
+
+public class NullCaptureProvider extends InputCaptureProvider {
+    @Override
+    public void enableCapture() {}
+
+    @Override
+    public void disableCapture() {}
+}

app/src/main/java/com/limelight/binding/input/capture/ShieldCaptureProvider.java

@@ -0,0 +1,91 @@
+package com.limelight.binding.input.capture;
+
+
+import android.content.Context;
+import android.hardware.input.InputManager;
+import android.view.MotionEvent;
+
+import com.limelight.LimeLog;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+// NVIDIA extended the Android input APIs with support for using an attached mouse in relative
+// mode without having to grab the input device (which requires root). The data comes in the form
+// of new AXIS_RELATIVE_X and AXIS_RELATIVE_Y constants in the mouse's MotionEvent objects and
+// a new function, InputManager.setCursorVisibility(), that allows the cursor to be hidden.
+//
+// http://docs.nvidia.com/gameworks/index.html#technologies/mobile/game_controller_handling_mouse.htm
+
+public class ShieldCaptureProvider extends InputCaptureProvider {
+    private static boolean nvExtensionSupported;
+    private static Method methodSetCursorVisibility;
+    private static int AXIS_RELATIVE_X;
+    private static int AXIS_RELATIVE_Y;
+
+    private Context context;
+
+    static {
+        try {
+            methodSetCursorVisibility = InputManager.class.getMethod("setCursorVisibility", boolean.class);
+
+            Field fieldRelX = MotionEvent.class.getField("AXIS_RELATIVE_X");
+            Field fieldRelY = MotionEvent.class.getField("AXIS_RELATIVE_Y");
+
+            AXIS_RELATIVE_X = (Integer) fieldRelX.get(null);
+            AXIS_RELATIVE_Y = (Integer) fieldRelY.get(null);
+
+            nvExtensionSupported = true;
+        } catch (Exception e) {
+            nvExtensionSupported = false;
+        }
+    }
+
+    public ShieldCaptureProvider(Context context) {
+        this.context = context;
+    }
+
+    public static boolean isCaptureProviderSupported() {
+        return nvExtensionSupported;
+    }
+
+    private boolean setCursorVisibility(boolean visible) {
+        try {
+            methodSetCursorVisibility.invoke(context.getSystemService(Context.INPUT_SERVICE), visible);
+            return true;
+        } catch (InvocationTargetException e) {
+            e.printStackTrace();
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        }
+
+        return false;
+    }
+
+    @Override
+    public void enableCapture() {
+        setCursorVisibility(false);
+    }
+
+    @Override
+    public void disableCapture() {
+        setCursorVisibility(true);
+    }
+
+    @Override
+    public boolean eventHasRelativeMouseAxes(MotionEvent event) {
+        return event.getAxisValue(AXIS_RELATIVE_X) != 0 ||
+                event.getAxisValue(AXIS_RELATIVE_Y) != 0;
+    }
+
+    @Override
+    public float getRelativeAxisX(MotionEvent event) {
+        return event.getAxisValue(AXIS_RELATIVE_X);
+    }
+
+    @Override
+    public float getRelativeAxisY(MotionEvent event) {
+        return event.getAxisValue(AXIS_RELATIVE_Y);
+    }
+}