Fixed bug 3191 - haptic system on android?

Patch provided by jintiao and Milan Nikolic, thanks!

android-project/AndroidManifest.xml

@@ -16,6 +16,8 @@
 
     <!-- Allow writing to external storage -->
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <!-- Allow access to the vibrator -->
+    <uses-permission android:name="android.permission.VIBRATE" />
 
     <!-- if you want to capture audio, uncomment this. -->
     <!-- <uses-permission android:name="android.permission.RECORD_AUDIO" /> -->

android-project/src/org/libsdl/app/SDLActivity.java

@@ -61,6 +61,7 @@ public class SDLActivity extends Activity {
     protected static View mTextEdit;
     protected static ViewGroup mLayout;
     protected static SDLJoystickHandler mJoystickHandler;
+    protected static SDLHapticHandler mHapticHandler;
 
     // This is what SDL runs in. It invokes SDL_main(), eventually
     protected static Thread mSDLThread;
@@ -113,6 +114,7 @@ public class SDLActivity extends Activity {
         mTextEdit = null;
         mLayout = null;
         mJoystickHandler = null;
+        mHapticHandler = null;
         mSDLThread = null;
         mAudioTrack = null;
         mAudioRecord = null;
@@ -182,6 +184,7 @@ public class SDLActivity extends Activity {
         else {
             mJoystickHandler = new SDLJoystickHandler();
         }
+        mHapticHandler = new SDLHapticHandler();
 
         mLayout = new RelativeLayout(this);
         mLayout.addView(mSurface);
@@ -498,6 +501,8 @@ public class SDLActivity extends Activity {
                                                int is_accelerometer, int nbuttons,
                                                int naxes, int nhats, int nballs);
     public static native int nativeRemoveJoystick(int device_id);
+    public static native int nativeAddHaptic(int device_id, String name);
+    public static native int nativeRemoveHaptic(int device_id);
     public static native String nativeGetHint(String name);
 
     /**
@@ -1704,6 +1709,18 @@ class SDLJoystickHandler_API12 extends SDLJoystickHandler {
         return null;
     }
 
+    public static void pollHapticDevices() {
+        if (SDLActivity.mSDLThread != null) {
+            mHapticHandler.pollHapticDevices();
+        }
+    }
+
+    public static void hapticRun(int device_id, int length) {
+        if (SDLActivity.mSDLThread != null) {
+            mHapticHandler.run(device_id, length);
+        }
+    }
+
     @Override
     public boolean handleMotionEvent(MotionEvent event) {
         if ((event.getSource() & InputDevice.SOURCE_JOYSTICK) != 0) {
@@ -1779,3 +1796,82 @@ class SDLGenericMotionListener_API12 implements View.OnGenericMotionListener {
         return false;
     }
 }
+
+class SDLHapticHandler {
+
+    class SDLHaptic {
+        public int device_id;
+        public String name;
+        public Vibrator vib;
+    }
+
+    private ArrayList<SDLHaptic> mHaptics;
+    
+    public SDLHapticHandler() {
+        mHaptics = new ArrayList<SDLHaptic>();
+    }
+
+    public void run(int device_id, int length) {
+        SDLHaptic haptic = getHaptic(device_id);
+        if (haptic != null) {
+            haptic.vib.vibrate (length);
+        }
+    }
+
+    public void pollHapticDevices() {
+        int[] deviceIds = InputDevice.getDeviceIds();
+        // It helps processing the device ids in reverse order
+        // For example, in the case of the XBox 360 wireless dongle,
+        // so the first controller seen by SDL matches what the receiver
+        // considers to be the first controller
+
+        for(int i=deviceIds.length-1; i>-1; i--) {
+            SDLHaptic haptic = getHaptic(deviceIds[i]);
+            if (haptic == null) {
+                InputDevice device = InputDevice.getDevice(deviceIds[i]);
+                Vibrator vib = device.getVibrator ();
+                if(vib.hasVibrator ()) {
+                    haptic = new SDLHaptic();
+                    haptic.device_id = deviceIds[i];
+                    haptic.name = device.getName();
+                    haptic.vib = vib;
+                    mHaptics.add(haptic);
+                    SDLActivity.nativeAddHaptic(haptic.device_id, haptic.name);
+                }
+            }
+        }
+
+        /* Check removed devices */
+        ArrayList<Integer> removedDevices = new ArrayList<Integer>();
+        for(int i=0; i < mHaptics.size(); i++) {
+            int device_id = mHaptics.get(i).device_id;
+            int j;
+            for (j=0; j < deviceIds.length; j++) {
+                if (device_id == deviceIds[j]) break;
+            }
+            if (j == deviceIds.length) {
+                removedDevices.add(device_id);
+            }
+        }
+
+        for(int i=0; i < removedDevices.size(); i++) {
+            int device_id = removedDevices.get(i);
+            SDLActivity.nativeRemoveHaptic(device_id);
+            for (int j=0; j < mHaptics.size(); j++) {
+                if (mHaptics.get(j).device_id == device_id) {
+                    mHaptics.remove(j);
+                    break;
+                }
+            }
+        }
+    }
+
+    protected SDLHaptic getHaptic(int device_id) {
+        for(int i=0; i < mHaptics.size(); i++) {
+            if (mHaptics.get(i).device_id == device_id) {
+                return mHaptics.get(i);
+            }
+        }
+        return null;
+    }   
+}