Merge "Remove voodoo magic."

    // on the same thread that the tests are running on to mimic the actual environment as

    // closely as possible.

    // Now, Looper#loop() never exits in normal operation unless the Looper#quit() method

    // is called, so we need to do that at the right time so that #loop() returns at some

    // point and we don't end up in an infinite loop.

    // After we quit, the looper is still technically ready to process more messages but

    // the handler will refuse to enqueue any because #quit() has been called and it

    // explicitly tests for it on message enqueuing, so we'll have to reset it so that

    // it lets us continue normal operation.

    // is called, which has a lot of bad side effects. We can however just throw an exception

    // in the runnable which will unwind the stack and allow us to exit.

    private final class InterruptRunMessagesException extends RuntimeException {

        // Empty class

    }

    protected void runMessages() {

        // Here begins deep magic.

        final Looper looper = mLatinIME.mHandler.getLooper();

        mLatinIME.mHandler.post(new Runnable() {

                @Override

                public void run() {

                    looper.quit();

                    throw new InterruptRunMessagesException();

                }

            });

        // The only way to get out of Looper#loop() is to call #quit() on it (or on its queue).

        // Once #quit() is called remaining messages are not processed, which is why we post

        // a message that calls it instead of calling it directly.

        Looper.loop();

        // Once #quit() has been called, the looper is not functional any more (it used to be,

        // but now it SIGSEGV's if it's used again).

        // It won't accept creating a new looper for this thread and switching to it...

        // ...unless we can trick it into throwing out the old looper and believing it hasn't

        // been initialized before.

        MessageQueue queue = Looper.myQueue();

        try {

            // However there is no way of doing it externally, and the static ThreadLocal

            // field into which it's stored is private.

            // So... get out the big guns.

            java.lang.reflect.Field f = Looper.class.getDeclaredField("sThreadLocal");

            f.setAccessible(true); // private lolwut

            final ThreadLocal<Looper> a = (ThreadLocal<Looper>) f.get(looper);

            a.set(null);

            looper.prepare();

        } catch (NoSuchFieldException e) {

            throw new RuntimeException(e);

        } catch (IllegalAccessException e) {

            throw new RuntimeException(e);

            Looper.loop();

        } catch (InterruptRunMessagesException e) {

            // Resume normal operation

        }

    }