SDLActivity.java

package org.libsdl.app;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import android.app.*;
import android.content.*;
import android.view.*;
import android.view.inputmethod.BaseInputConnection;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputMethodManager;
import android.widget.AbsoluteLayout;
import android.os.*;
import android.util.Log;
import android.graphics.*;
import android.media.*;
import android.hardware.*;


/**
    SDL Activity
*/
public class SDLActivity extends Activity {
    private static final String TAG = "SDL";

    // Keep track of the paused state
    public static boolean mIsPaused, mIsSurfaceReady, mHasFocus;
    public static boolean mExitCalledFromJava;

    // Main components
    protected static SDLActivity mSingleton;
    protected static SDLSurface mSurface;
    protected static View mTextEdit;
    protected static ViewGroup mLayout;
    protected static SDLJoystickHandler mJoystickHandler;

    // This is what SDL runs in. It invokes SDL_main(), eventually
    protected static Thread mSDLThread;
    
    // Audio
    protected static AudioTrack mAudioTrack;

    // Load the .so
    static {
        System.loadLibrary("SDL2");
        //System.loadLibrary("SDL2_image");
        //System.loadLibrary("SDL2_mixer");
        //System.loadLibrary("SDL2_net");
        //System.loadLibrary("SDL2_ttf");
        System.loadLibrary("main");
    }
    
    
    public static void initialize() {
        // The static nature of the singleton and Android quirkyness force us to initialize everything here
        // Otherwise, when exiting the app and returning to it, these variables *keep* their pre exit values
        mSingleton = null;
        mSurface = null;
        mTextEdit = null;
        mLayout = null;
        mJoystickHandler = null;
        mSDLThread = null;
        mAudioTrack = null;
        mExitCalledFromJava = false;
        mIsPaused = false;
        mIsSurfaceReady = false;
        mHasFocus = true;
    }

    // Setup
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Log.v("SDL", "onCreate():" + mSingleton);
        super.onCreate(savedInstanceState);
        
        SDLActivity.initialize();
        // So we can call stuff from static callbacks
        mSingleton = this;

        // Set up the surface
        mSurface = new SDLSurface(getApplication());
        
        if(Build.VERSION.SDK_INT >= 12) {
            mJoystickHandler = new SDLJoystickHandler_API12();
        }
        else {
            mJoystickHandler = new SDLJoystickHandler();
        }

        mLayout = new AbsoluteLayout(this);
        mLayout.addView(mSurface);

        setContentView(mLayout);
    }

    // Events
    @Override
    protected void onPause() {
        Log.v("SDL", "onPause()");
        super.onPause();
        SDLActivity.handlePause();
    }

    @Override
    protected void onResume() {
        Log.v("SDL", "onResume()");
        super.onResume();
        SDLActivity.handleResume();
    }


    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        Log.v("SDL", "onWindowFocusChanged(): " + hasFocus);

        SDLActivity.mHasFocus = hasFocus;
        if (hasFocus) {
            SDLActivity.handleResume();
        }
    }

    @Override
    public void onLowMemory() {
        Log.v("SDL", "onLowMemory()");
        super.onLowMemory();
        SDLActivity.nativeLowMemory();
    }

    @Override
    protected void onDestroy() {
        Log.v("SDL", "onDestroy()");
        // Send a quit message to the application
        SDLActivity.mExitCalledFromJava = true;
        SDLActivity.nativeQuit();

        // Now wait for the SDL thread to quit
        if (SDLActivity.mSDLThread != null) {
            try {
                SDLActivity.mSDLThread.join();
            } catch(Exception e) {
                Log.v("SDL", "Problem stopping thread: " + e);
            }
            SDLActivity.mSDLThread = null;

            //Log.v("SDL", "Finished waiting for SDL thread");
        }
            
        super.onDestroy();
        // Reset everything in case the user re opens the app
        SDLActivity.initialize();
    }

    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        int keyCode = event.getKeyCode();
        // Ignore certain special keys so they're handled by Android
        if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN ||
            keyCode == KeyEvent.KEYCODE_VOLUME_UP ||
            keyCode == KeyEvent.KEYCODE_CAMERA ||
            keyCode == 168 || /* API 11: KeyEvent.KEYCODE_ZOOM_IN */
            keyCode == 169 /* API 11: KeyEvent.KEYCODE_ZOOM_OUT */
            ) {
            return false;
        }
        return super.dispatchKeyEvent(event);
    }

    /** Called by onPause or surfaceDestroyed. Even if surfaceDestroyed
     *  is the first to be called, mIsSurfaceReady should still be set
     *  to 'true' during the call to onPause (in a usual scenario).
     */
    public static void handlePause() {
        if (!SDLActivity.mIsPaused && SDLActivity.mIsSurfaceReady) {
            SDLActivity.mIsPaused = true;
            SDLActivity.nativePause();
            mSurface.enableSensor(Sensor.TYPE_ACCELEROMETER, false);
        }
    }

    /** Called by onResume or surfaceCreated. An actual resume should be done only when the surface is ready.
     * Note: Some Android variants may send multiple surfaceChanged events, so we don't need to resume
     * every time we get one of those events, only if it comes after surfaceDestroyed
     */
    public static void handleResume() {
        if (SDLActivity.mIsPaused && SDLActivity.mIsSurfaceReady && SDLActivity.mHasFocus) {
            SDLActivity.mIsPaused = false;
            SDLActivity.nativeResume();
            mSurface.enableSensor(Sensor.TYPE_ACCELEROMETER, true);
        }
    }
        
    /* The native thread has finished */
    public static void handleNativeExit() {
        SDLActivity.mSDLThread = null;
        mSingleton.finish();
    }


    // Messages from the SDLMain thread
    static final int COMMAND_CHANGE_TITLE = 1;
    static final int COMMAND_UNUSED = 2;
    static final int COMMAND_TEXTEDIT_HIDE = 3;

    protected static final int COMMAND_USER = 0x8000;

    /**
     * This method is called by SDL if SDL did not handle a message itself.
     * This happens if a received message contains an unsupported command.
     * Method can be overwritten to handle Messages in a different class.
     * @param command the command of the message.
     * @param param the parameter of the message. May be null.
     * @return if the message was handled in overridden method.
     */
    protected boolean onUnhandledMessage(int command, Object param) {
        return false;
    }

    /**
     * A Handler class for Messages from native SDL applications.
     * It uses current Activities as target (e.g. for the title).
     * static to prevent implicit references to enclosing object.
     */
    protected static class SDLCommandHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            Context context = getContext();
            if (context == null) {
                Log.e(TAG, "error handling message, getContext() returned null");
                return;
            }
            switch (msg.arg1) {
            case COMMAND_CHANGE_TITLE:
                if (context instanceof Activity) {
                    ((Activity) context).setTitle((String)msg.obj);
                } else {
                    Log.e(TAG, "error handling message, getContext() returned no Activity");
                }
                break;
            case COMMAND_TEXTEDIT_HIDE:
                if (mTextEdit != null) {
                    mTextEdit.setVisibility(View.GONE);

                    InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
                    imm.hideSoftInputFromWindow(mTextEdit.getWindowToken(), 0);
                }
                break;

            default:
                if ((context instanceof SDLActivity) && !((SDLActivity) context).onUnhandledMessage(msg.arg1, msg.obj)) {
                    Log.e(TAG, "error handling message, command is " + msg.arg1);
                }
            }
        }
    }

    // Handler for the messages
    Handler commandHandler = new SDLCommandHandler();

    // Send a message from the SDLMain thread
    boolean sendCommand(int command, Object data) {
        Message msg = commandHandler.obtainMessage();
        msg.arg1 = command;
        msg.obj = data;
        return commandHandler.sendMessage(msg);
    }

    // C functions we call
    public static native void nativeInit();
    public static native void nativeLowMemory();
    public static native void nativeQuit();
    public static native void nativePause();
    public static native void nativeResume();
    public static native void onNativeResize(int x, int y, int format);
    public static native int onNativePadDown(int device_id, int keycode);
    public static native int onNativePadUp(int device_id, int keycode);
    public static native void onNativeJoy(int device_id, int axis,
                                          float value);
    public static native void onNativeHat(int device_id, int hat_id,
                                          int x, int y);
    public static native void onNativeKeyDown(int keycode);
    public static native void onNativeKeyUp(int keycode);
    public static native void onNativeKeyboardFocusLost();
    public static native void onNativeTouch(int touchDevId, int pointerFingerId,
                                            int action, float x, 
                                            float y, float p);
    public static native void onNativeAccel(float x, float y, float z);
    public static native void onNativeSurfaceChanged();
    public static native void onNativeSurfaceDestroyed();
    public static native void nativeFlipBuffers();
    public static native int nativeAddJoystick(int device_id, String name, 
                                               int is_accelerometer, int nbuttons, 
                                               int naxes, int nhats, int nballs);
    public static native int nativeRemoveJoystick(int device_id);

    public static void flipBuffers() {
        SDLActivity.nativeFlipBuffers();
    }

    public static boolean setActivityTitle(String title) {
        // Called from SDLMain() thread and can't directly affect the view
        return mSingleton.sendCommand(COMMAND_CHANGE_TITLE, title);
    }

    public static boolean sendMessage(int command, int param) {
        return mSingleton.sendCommand(command, Integer.valueOf(param));
    }

    public static Context getContext() {
        return mSingleton;
    }

    /**
     * @return result of getSystemService(name) but executed on UI thread.
     */
    public Object getSystemServiceFromUiThread(final String name) {
        final Object lock = new Object();
        final Object[] results = new Object[2]; // array for writable variables
        synchronized (lock) {
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    synchronized (lock) {
                        results[0] = getSystemService(name);
                        results[1] = Boolean.TRUE;
                        lock.notify();
                    }
                }
            });
            if (results[1] == null) {
                try {
                    lock.wait();
                } catch (InterruptedException ex) {
                    ex.printStackTrace();
                }
            }
        }
        return results[0];
    }

    static class ShowTextInputTask implements Runnable {
        /*
         * This is used to regulate the pan&scan method to have some offset from
         * the bottom edge of the input region and the top edge of an input
         * method (soft keyboard)
         */
        static final int HEIGHT_PADDING = 15;

        public int x, y, w, h;

        public ShowTextInputTask(int x, int y, int w, int h) {
            this.x = x;
            this.y = y;
            this.w = w;
            this.h = h;
        }

        @Override
        public void run() {
            AbsoluteLayout.LayoutParams params = new AbsoluteLayout.LayoutParams(
                    w, h + HEIGHT_PADDING, x, y);

            if (mTextEdit == null) {
                mTextEdit = new DummyEdit(getContext());

                mLayout.addView(mTextEdit, params);
            } else {
                mTextEdit.setLayoutParams(params);
            }

            mTextEdit.setVisibility(View.VISIBLE);
            mTextEdit.requestFocus();

            InputMethodManager imm = (InputMethodManager) getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.showSoftInput(mTextEdit, 0);
        }
    }

    public static boolean showTextInput(int x, int y, int w, int h) {
        // Transfer the task to the main thread as a Runnable
        return mSingleton.commandHandler.post(new ShowTextInputTask(x, y, w, h));
    }
            
    public static Surface getNativeSurface() {
        return SDLActivity.mSurface.getNativeSurface();
    }

    // Audio
    public static int audioInit(int sampleRate, boolean is16Bit, boolean isStereo, int desiredFrames) {
        int channelConfig = isStereo ? AudioFormat.CHANNEL_CONFIGURATION_STEREO : AudioFormat.CHANNEL_CONFIGURATION_MONO;
        int audioFormat = is16Bit ? AudioFormat.ENCODING_PCM_16BIT : AudioFormat.ENCODING_PCM_8BIT;
        int frameSize = (isStereo ? 2 : 1) * (is16Bit ? 2 : 1);
        
        Log.v("SDL", "SDL audio: wanted " + (isStereo ? "stereo" : "mono") + " " + (is16Bit ? "16-bit" : "8-bit") + " " + (sampleRate / 1000f) + "kHz, " + desiredFrames + " frames buffer");
        
        // Let the user pick a larger buffer if they really want -- but ye
        // gods they probably shouldn't, the minimums are horrifyingly high
        // latency already
        desiredFrames = Math.max(desiredFrames, (AudioTrack.getMinBufferSize(sampleRate, channelConfig, audioFormat) + frameSize - 1) / frameSize);
        
        if (mAudioTrack == null) {
            mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate,
                    channelConfig, audioFormat, desiredFrames * frameSize, AudioTrack.MODE_STREAM);
            
            // Instantiating AudioTrack can "succeed" without an exception and the track may still be invalid
            // Ref: https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/media/java/android/media/AudioTrack.java
            // Ref: http://developer.android.com/reference/android/media/AudioTrack.html#getState()
            
            if (mAudioTrack.getState() != AudioTrack.STATE_INITIALIZED) {
                Log.e("SDL", "Failed during initialization of Audio Track");
                mAudioTrack = null;
                return -1;
            }
            
            mAudioTrack.play();
        }
       
        Log.v("SDL", "SDL audio: got " + ((mAudioTrack.getChannelCount() >= 2) ? "stereo" : "mono") + " " + ((mAudioTrack.getAudioFormat() == AudioFormat.ENCODING_PCM_16BIT) ? "16-bit" : "8-bit") + " " + (mAudioTrack.getSampleRate() / 1000f) + "kHz, " + desiredFrames + " frames buffer");
        
        return 0;
    }
    
    public static void audioWriteShortBuffer(short[] buffer) {
        for (int i = 0; i < buffer.length; ) {
            int result = mAudioTrack.write(buffer, i, buffer.length - i);
            if (result > 0) {
                i += result;
            } else if (result == 0) {
                try {
                    Thread.sleep(1);
                } catch(InterruptedException e) {
                    // Nom nom
                }
            } else {
                Log.w("SDL", "SDL audio: error return from write(short)");
                return;
            }
        }
    }
    
    public static void audioWriteByteBuffer(byte[] buffer) {
        for (int i = 0; i < buffer.length; ) {
            int result = mAudioTrack.write(buffer, i, buffer.length - i);
            if (result > 0) {
                i += result;
            } else if (result == 0) {
                try {
                    Thread.sleep(1);
                } catch(InterruptedException e) {
                    // Nom nom
                }
            } else {
                Log.w("SDL", "SDL audio: error return from write(byte)");
                return;
            }
        }
    }

    public static void audioQuit() {
        if (mAudioTrack != null) {
            mAudioTrack.stop();
            mAudioTrack = null;
        }
    }

    // Input

    /**
     * @return an array which may be empty but is never null.
     */
    public static int[] inputGetInputDeviceIds(int sources) {
        int[] ids = InputDevice.getDeviceIds();
        int[] filtered = new int[ids.length];
        int used = 0;
        for (int i = 0; i < ids.length; ++i) {
            InputDevice device = InputDevice.getDevice(ids[i]);
            if ((device != null) && ((device.getSources() & sources) != 0)) {
                filtered[used++] = device.getId();
            }
        }
        return Arrays.copyOf(filtered, used);
    }
            
    // Joystick glue code, just a series of stubs that redirect to the SDLJoystickHandler instance
    public static boolean handleJoystickMotionEvent(MotionEvent event) {
        return mJoystickHandler.handleMotionEvent(event);
    }
    
    public static void pollInputDevices() {
        if (SDLActivity.mSDLThread != null) {
            mJoystickHandler.pollInputDevices();
        }
    }
    
}

/**
    Simple nativeInit() runnable
*/
class SDLMain implements Runnable {
    @Override
    public void run() {
        // Runs SDL_main()
        SDLActivity.nativeInit();

        //Log.v("SDL", "SDL thread terminated");
    }
}


/**
    SDLSurface. This is what we draw on, so we need to know when it's created
    in order to do anything useful. 

    Because of this, that's where we set up the SDL thread
*/
class SDLSurface extends SurfaceView implements SurfaceHolder.Callback, 
    View.OnKeyListener, View.OnTouchListener, SensorEventListener  {

    // Sensors
    protected static SensorManager mSensorManager;
    protected static Display mDisplay;

    // Keep track of the surface size to normalize touch events
    protected static float mWidth, mHeight;

    // Startup    
    public SDLSurface(Context context) {
        super(context);
        getHolder().addCallback(this); 
    
        setFocusable(true);
        setFocusableInTouchMode(true);
        requestFocus();
        setOnKeyListener(this); 
        setOnTouchListener(this);   

        mDisplay = ((WindowManager)context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
        mSensorManager = (SensorManager)context.getSystemService(Context.SENSOR_SERVICE);
        
        if(Build.VERSION.SDK_INT >= 12) {
            setOnGenericMotionListener(new SDLGenericMotionListener_API12());
        }

        // Some arbitrary defaults to avoid a potential division by zero
        mWidth = 1.0f;
        mHeight = 1.0f;
    }
    
    public Surface getNativeSurface() {
        return getHolder().getSurface();
    }

    // Called when we have a valid drawing surface
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        Log.v("SDL", "surfaceCreated()");
        holder.setType(SurfaceHolder.SURFACE_TYPE_GPU);
    }

    // Called when we lose the surface
    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        Log.v("SDL", "surfaceDestroyed()");
        // Call this *before* setting mIsSurfaceReady to 'false'
        SDLActivity.handlePause();
        SDLActivity.mIsSurfaceReady = false;
        SDLActivity.onNativeSurfaceDestroyed();
    }

    // Called when the surface is resized
    @Override
    public void surfaceChanged(SurfaceHolder holder,
                               int format, int width, int height) {
        Log.v("SDL", "surfaceChanged()");

        int sdlFormat = 0x15151002; // SDL_PIXELFORMAT_RGB565 by default
        switch (format) {
        case PixelFormat.A_8:
            Log.v("SDL", "pixel format A_8");
            break;
        case PixelFormat.LA_88:
            Log.v("SDL", "pixel format LA_88");
            break;
        case PixelFormat.L_8:
            Log.v("SDL", "pixel format L_8");
            break;
        case PixelFormat.RGBA_4444:
            Log.v("SDL", "pixel format RGBA_4444");
            sdlFormat = 0x15421002; // SDL_PIXELFORMAT_RGBA4444
            break;
        case PixelFormat.RGBA_5551:
            Log.v("SDL", "pixel format RGBA_5551");
            sdlFormat = 0x15441002; // SDL_PIXELFORMAT_RGBA5551
            break;
        case PixelFormat.RGBA_8888:
            Log.v("SDL", "pixel format RGBA_8888");
            sdlFormat = 0x16462004; // SDL_PIXELFORMAT_RGBA8888
            break;
        case PixelFormat.RGBX_8888:
            Log.v("SDL", "pixel format RGBX_8888");
            sdlFormat = 0x16261804; // SDL_PIXELFORMAT_RGBX8888
            break;
        case PixelFormat.RGB_332:
            Log.v("SDL", "pixel format RGB_332");
            sdlFormat = 0x14110801; // SDL_PIXELFORMAT_RGB332
            break;
        case PixelFormat.RGB_565:
            Log.v("SDL", "pixel format RGB_565");
            sdlFormat = 0x15151002; // SDL_PIXELFORMAT_RGB565
            break;
        case PixelFormat.RGB_888:
            Log.v("SDL", "pixel format RGB_888");
            // Not sure this is right, maybe SDL_PIXELFORMAT_RGB24 instead?
            sdlFormat = 0x16161804; // SDL_PIXELFORMAT_RGB888
            break;
        default:
            Log.v("SDL", "pixel format unknown " + format);
            break;
        }

        mWidth = width;
        mHeight = height;
        SDLActivity.onNativeResize(width, height, sdlFormat);
        Log.v("SDL", "Window size:" + width + "x"+height);

        // Set mIsSurfaceReady to 'true' *before* making a call to handleResume
        SDLActivity.mIsSurfaceReady = true;
        SDLActivity.onNativeSurfaceChanged();


        if (SDLActivity.mSDLThread == null) {
            // This is the entry point to the C app.
            // Start up the C app thread and enable sensor input for the first time

            SDLActivity.mSDLThread = new Thread(new SDLMain(), "SDLThread");
            enableSensor(Sensor.TYPE_ACCELEROMETER, true);
            SDLActivity.mSDLThread.start();
            
            // Set up a listener thread to catch when the native thread ends
            new Thread(new Runnable(){
                @Override
                public void run(){
                    try {
                        SDLActivity.mSDLThread.join();
                    }
                    catch(Exception e){}
                    finally{ 
                        // Native thread has finished
                        if (! SDLActivity.mExitCalledFromJava) {
                            SDLActivity.handleNativeExit();
                        }
                    }
                }
            }).start();
        }
    }

    // unused
    @Override
    public void onDraw(Canvas canvas) {}


    // Key events
    @Override
    public boolean onKey(View  v, int keyCode, KeyEvent event) {
        // Dispatch the different events depending on where they come from
        // Some SOURCE_DPAD or SOURCE_GAMEPAD are also SOURCE_KEYBOARD
        // So, we try to process them as DPAD or GAMEPAD events first, if that fails we try them as KEYBOARD
        
        if ( (event.getSource() & 0x00000401) != 0 || /* API 12: SOURCE_GAMEPAD */
                   (event.getSource() & InputDevice.SOURCE_DPAD) != 0 ) {
            if (event.getAction() == KeyEvent.ACTION_DOWN) {
                if (SDLActivity.onNativePadDown(event.getDeviceId(), keyCode) == 0) {
                    return true;
                }
            } else if (event.getAction() == KeyEvent.ACTION_UP) {
                if (SDLActivity.onNativePadUp(event.getDeviceId(), keyCode) == 0) {
                    return true;
                }
            }
        }
        
        if( (event.getSource() & InputDevice.SOURCE_KEYBOARD) != 0) {
            if (event.getAction() == KeyEvent.ACTION_DOWN) {
                //Log.v("SDL", "key down: " + keyCode);
                SDLActivity.onNativeKeyDown(keyCode);
                return true;
            }
            else if (event.getAction() == KeyEvent.ACTION_UP) {
                //Log.v("SDL", "key up: " + keyCode);
                SDLActivity.onNativeKeyUp(keyCode);
                return true;
            }
        }
        
        return false;
    }

    // Touch events
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        /* Ref: http://developer.android.com/training/gestures/multi.html */
        final int touchDevId = event.getDeviceId();
        final int pointerCount = event.getPointerCount();
        int action = event.getActionMasked();
        int pointerFingerId;
        int i = -1;
        float x,y,p;
        
        switch(action) {
            case MotionEvent.ACTION_MOVE:
                for (i = 0; i < pointerCount; i++) {
                    pointerFingerId = event.getPointerId(i);
                    x = event.getX(i) / mWidth;
                    y = event.getY(i) / mHeight;
                    p = event.getPressure(i);
                    SDLActivity.onNativeTouch(touchDevId, pointerFingerId, action, x, y, p);
                }
                break;
            
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_DOWN:
                // Primary pointer up/down, the index is always zero
                i = 0;
            case MotionEvent.ACTION_POINTER_UP:
            case MotionEvent.ACTION_POINTER_DOWN:
                // Non primary pointer up/down
                if (i == -1) {
                    i = event.getActionIndex();
                }
                
                pointerFingerId = event.getPointerId(i);
                x = event.getX(i) / mWidth;
                y = event.getY(i) / mHeight;
                p = event.getPressure(i);
                SDLActivity.onNativeTouch(touchDevId, pointerFingerId, action, x, y, p);
                break;
            
            default:
                break;
        }

        return true;
   } 

    // Sensor events
    public void enableSensor(int sensortype, boolean enabled) {
        // TODO: This uses getDefaultSensor - what if we have >1 accels?
        if (enabled) {
            mSensorManager.registerListener(this, 
                            mSensorManager.getDefaultSensor(sensortype), 
                            SensorManager.SENSOR_DELAY_GAME, null);
        } else {
            mSensorManager.unregisterListener(this, 
                            mSensorManager.getDefaultSensor(sensortype));
        }
    }
    
    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // TODO
    }

    @Override
    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
            float x, y;
            switch (mDisplay.getRotation()) {
                case Surface.ROTATION_90:
                    x = -event.values[1];
                    y = event.values[0];
                    break;
                case Surface.ROTATION_270:
                    x = event.values[1];
                    y = -event.values[0];
                    break;
                case Surface.ROTATION_180:
                    x = -event.values[1];
                    y = -event.values[0];
                    break;
                default:
                    x = event.values[0];
                    y = event.values[1];
                    break;
            }
            SDLActivity.onNativeAccel(-x / SensorManager.GRAVITY_EARTH,
                                      y / SensorManager.GRAVITY_EARTH,
                                      event.values[2] / SensorManager.GRAVITY_EARTH - 1);
        }
    }    
}

/* This is a fake invisible editor view that receives the input and defines the
 * pan&scan region
 */
class DummyEdit extends View implements View.OnKeyListener {
    InputConnection ic;

    public DummyEdit(Context context) {
        super(context);
        setFocusableInTouchMode(true);
        setFocusable(true);
        setOnKeyListener(this);
    }

    @Override
    public boolean onCheckIsTextEditor() {
        return true;
    }

    @Override
    public boolean onKey(View v, int keyCode, KeyEvent event) {

        // This handles the hardware keyboard input
        if (event.isPrintingKey()) {
            if (event.getAction() == KeyEvent.ACTION_DOWN) {
                ic.commitText(String.valueOf((char) event.getUnicodeChar()), 1);
            }
            return true;
        }

        if (event.getAction() == KeyEvent.ACTION_DOWN) {
            SDLActivity.onNativeKeyDown(keyCode);
            return true;
        } else if (event.getAction() == KeyEvent.ACTION_UP) {
            SDLActivity.onNativeKeyUp(keyCode);
            return true;
        }

        return false;
    }
        
    //
    @Override
    public boolean onKeyPreIme (int keyCode, KeyEvent event) {
        // As seen on StackOverflow: http://stackoverflow.com/questions/7634346/keyboard-hide-event
        // FIXME: Discussion at http://bugzilla.libsdl.org/show_bug.cgi?id=1639
        // FIXME: This is not a 100% effective solution to the problem of detecting if the keyboard is showing or not
        // FIXME: A more effective solution would be to change our Layout from AbsoluteLayout to Relative or Linear
        // FIXME: And determine the keyboard presence doing this: http://stackoverflow.com/questions/2150078/how-to-check-visibility-of-software-keyboard-in-android
        // FIXME: An even more effective way would be if Android provided this out of the box, but where would the fun be in that :)
        if (event.getAction()==KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_BACK) {
            if (SDLActivity.mTextEdit != null && SDLActivity.mTextEdit.getVisibility() == View.VISIBLE) {
                SDLActivity.onNativeKeyboardFocusLost();
            }
        }
        return super.onKeyPreIme(keyCode, event);
    }

    @Override
    public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
        ic = new SDLInputConnection(this, true);

        outAttrs.imeOptions = EditorInfo.IME_FLAG_NO_EXTRACT_UI
                | 33554432 /* API 11: EditorInfo.IME_FLAG_NO_FULLSCREEN */;

        return ic;
    }
}

class SDLInputConnection extends BaseInputConnection {

    public SDLInputConnection(View targetView, boolean fullEditor) {
        super(targetView, fullEditor);

    }

    @Override
    public boolean sendKeyEvent(KeyEvent event) {

        /*
         * This handles the keycodes from soft keyboard (and IME-translated
         * input from hardkeyboard)
         */
        int keyCode = event.getKeyCode();
        if (event.getAction() == KeyEvent.ACTION_DOWN) {
            if (event.isPrintingKey()) {
                commitText(String.valueOf((char) event.getUnicodeChar()), 1);
            }
            SDLActivity.onNativeKeyDown(keyCode);
            return true;
        } else if (event.getAction() == KeyEvent.ACTION_UP) {

            SDLActivity.onNativeKeyUp(keyCode);
            return true;
        }
        return super.sendKeyEvent(event);
    }

    @Override
    public boolean commitText(CharSequence text, int newCursorPosition) {

        nativeCommitText(text.toString(), newCursorPosition);

        return super.commitText(text, newCursorPosition);
    }

    @Override
    public boolean setComposingText(CharSequence text, int newCursorPosition) {

        nativeSetComposingText(text.toString(), newCursorPosition);

        return super.setComposingText(text, newCursorPosition);
    }

    public native void nativeCommitText(String text, int newCursorPosition);

    public native void nativeSetComposingText(String text, int newCursorPosition);

    @Override
    public boolean deleteSurroundingText(int beforeLength, int afterLength) {       
        // Workaround to capture backspace key. Ref: http://stackoverflow.com/questions/14560344/android-backspace-in-webview-baseinputconnection
        if (beforeLength == 1 && afterLength == 0) {
            // backspace
            return super.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DEL))
                && super.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_DEL));
        }

        return super.deleteSurroundingText(beforeLength, afterLength);
    }
}

/* A null joystick handler for API level < 12 devices (the accelerometer is handled separately) */
class SDLJoystickHandler {
    
    public boolean handleMotionEvent(MotionEvent event) {
        return false;
    }
    
    public void pollInputDevices() {
    }
}

/* Actual joystick functionality available for API >= 12 devices */
class SDLJoystickHandler_API12 extends SDLJoystickHandler {
  
    class SDLJoystick {
        public int device_id;
        public String name;
        public ArrayList<InputDevice.MotionRange> axes;
        public ArrayList<InputDevice.MotionRange> hats;
    }
    class RangeComparator implements Comparator<InputDevice.MotionRange>
    {
        @Override
        public int compare(InputDevice.MotionRange arg0, InputDevice.MotionRange arg1) {
            return arg0.getAxis() - arg1.getAxis();
        }
    }
    
    private ArrayList<SDLJoystick> mJoysticks;
    
    public SDLJoystickHandler_API12() {
       
        mJoysticks = new ArrayList<SDLJoystick>();
    }

    @Override
    public void pollInputDevices() {
        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--) {
            SDLJoystick joystick = getJoystick(deviceIds[i]);
            if (joystick == null) {
                joystick = new SDLJoystick();
                InputDevice joystickDevice = InputDevice.getDevice(deviceIds[i]);
                if( (joystickDevice.getSources() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) {
                    joystick.device_id = deviceIds[i];
                    joystick.name = joystickDevice.getName();
                    joystick.axes = new ArrayList<InputDevice.MotionRange>();
                    joystick.hats = new ArrayList<InputDevice.MotionRange>();
                    
                    List<InputDevice.MotionRange> ranges = joystickDevice.getMotionRanges();
                    Collections.sort(ranges, new RangeComparator());
                    for (InputDevice.MotionRange range : ranges ) {
                        if ((range.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0 ) {
                            if (range.getAxis() == MotionEvent.AXIS_HAT_X ||
                                range.getAxis() == MotionEvent.AXIS_HAT_Y) {
                                joystick.hats.add(range);
                            }
                            else {
                                joystick.axes.add(range);
                            }
                        }
                    }
                    
                    mJoysticks.add(joystick);
                    SDLActivity.nativeAddJoystick(joystick.device_id, joystick.name, 0, -1, 
                                                  joystick.axes.size(), joystick.hats.size()/2, 0);
                }
            }
        }
        
        /* Check removed devices */
        ArrayList<Integer> removedDevices = new ArrayList<Integer>();
        for(int i=0; i < mJoysticks.size(); i++) {
            int device_id = mJoysticks.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.nativeRemoveJoystick(device_id);
            for (int j=0; j < mJoysticks.size(); j++) {
                if (mJoysticks.get(j).device_id == device_id) {
                    mJoysticks.remove(j);
                    break;
                }
            }
        }        
    }
    
    protected SDLJoystick getJoystick(int device_id) {
        for(int i=0; i < mJoysticks.size(); i++) {
            if (mJoysticks.get(i).device_id == device_id) {
                return mJoysticks.get(i);
            }
        }
        return null;
    }   
    
    @Override        
    public boolean handleMotionEvent(MotionEvent event) {
        if ( (event.getSource() & InputDevice.SOURCE_JOYSTICK) != 0) {
            int actionPointerIndex = event.getActionIndex();
            int action = event.getActionMasked();
            switch(action) {
                case MotionEvent.ACTION_MOVE:
                    SDLJoystick joystick = getJoystick(event.getDeviceId());
                    if ( joystick != null ) {
                        for (int i = 0; i < joystick.axes.size(); i++) {
                            InputDevice.MotionRange range = joystick.axes.get(i);
                            /* Normalize the value to -1...1 */
                            float value = ( event.getAxisValue( range.getAxis(), actionPointerIndex) - range.getMin() ) / range.getRange() * 2.0f - 1.0f;
                            SDLActivity.onNativeJoy(joystick.device_id, i, value );
                        }          
                        for (int i = 0; i < joystick.hats.size(); i+=2) {
                            int hatX = Math.round(event.getAxisValue( joystick.hats.get(i).getAxis(), actionPointerIndex ) );
                            int hatY = Math.round(event.getAxisValue( joystick.hats.get(i+1).getAxis(), actionPointerIndex ) );
                            SDLActivity.onNativeHat(joystick.device_id, i/2, hatX, hatY );
                        }
                    }
                    break;
                default:
                    break;
            }
        }
        return true;
    }            
}

class SDLGenericMotionListener_API12 implements View.OnGenericMotionListener {
    // Generic Motion (mouse hover, joystick...) events go here
    // We only have joysticks yet
    @Override
    public boolean onGenericMotion(View v, MotionEvent event) {
        return SDLActivity.handleJoystickMotionEvent(event);
    }
}