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app/src/main/java/com/hippo/util/Dpad.java

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+/*
+ * Copyright 2016 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.util;
+
+import android.view.InputDevice;
+import android.view.InputEvent;
+import android.view.KeyEvent;
+import android.view.MotionEvent;
+
+// From http://developer.android.com/training/game-controllers/controller-input.html#dpad
+public class Dpad {
+
+    public static final int INVALID = -1;
+    public static final int UP = 0;
+    public static final int LEFT = 1;
+    public static final int RIGHT = 2;
+    public static final int DOWN = 3;
+    public static final int CENTER = 4;
+
+    public static int getDirectionPressed(InputEvent event) {
+        if (!isDpadDevice(event)) {
+            return INVALID;
+        }
+
+        int directionPressed = INVALID;
+
+        // If the input event is a MotionEvent, check its hat axis values.
+        if (event instanceof MotionEvent) {
+
+            // Use the hat axis value to find the D-pad direction
+            MotionEvent motionEvent = (MotionEvent) event;
+            float xaxis = motionEvent.getAxisValue(MotionEvent.AXIS_HAT_X);
+            float yaxis = motionEvent.getAxisValue(MotionEvent.AXIS_HAT_Y);
+
+            // Check if the AXIS_HAT_X value is -1 or 1, and set the D-pad
+            // LEFT and RIGHT direction accordingly.
+            if (Float.compare(xaxis, -1.0f) == 0) {
+                directionPressed =  Dpad.LEFT;
+            } else if (Float.compare(xaxis, 1.0f) == 0) {
+                directionPressed =  Dpad.RIGHT;
+            }
+            // Check if the AXIS_HAT_Y value is -1 or 1, and set the D-pad
+            // UP and DOWN direction accordingly.
+            else if (Float.compare(yaxis, -1.0f) == 0) {
+                directionPressed =  Dpad.UP;
+            } else if (Float.compare(yaxis, 1.0f) == 0) {
+                directionPressed =  Dpad.DOWN;
+            }
+        }
+
+        // If the input event is a KeyEvent, check its key code.
+        else if (event instanceof KeyEvent) {
+
+            // Use the key code to find the D-pad direction.
+            KeyEvent keyEvent = (KeyEvent) event;
+            if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_LEFT) {
+                directionPressed = Dpad.LEFT;
+            } else if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_RIGHT) {
+                directionPressed = Dpad.RIGHT;
+            } else if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_UP) {
+                directionPressed = Dpad.UP;
+            } else if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_DOWN) {
+                directionPressed = Dpad.DOWN;
+            } else if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_CENTER) {
+                directionPressed = Dpad.CENTER;
+            }
+        }
+        return directionPressed;
+    }
+
+    public static boolean isDpadDevice(InputEvent event) {
+        // Check that input comes from a device with directional pads.
+        if ((event.getSource() & InputDevice.SOURCE_DPAD)
+                != InputDevice.SOURCE_DPAD) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+}