Android : Taking screenshot and sharing it through shareIntent in andengine

Hi I am making a game where there is a share button. If a user clicks it, it will take the current screen as a PNG image and share it through share intent. I am able to take the screenshot and save it to storage and then I wish to invoke the share intent through startActivity(). I have two functions for that: captureImage() will save the screenshot, then I am calling shareImage() to invoke the startActivity(). My problem is whenever I click on the button it invokes the shareActivity() first and then tries to capture the screenshot. I mean they are running in two different threads, while a thread tries to capture image, another thread invokes startActivity(), so it tries to collect the image from the predefined path before it is actually saved. Here I am facing the problem as its always giving me the error. Following are my codes: I put two different toasts to find out which one is running first. I found shareImage() toast is always coming first. I am trying to find a way to make shareImage() run until captureImage() is finished.

final Sprite sShare = new Sprite(Constants.CAMERA_WIDTH - 50 , 20, this.mShare, this.vertexBufferObjectManager) {
    @Override
    public boolean onAreaTouched(final TouchEvent pSceneTouchEvent, final float pTouchAreaLocalX, final float pTouchAreaLocalY) {
        if(pSceneTouchEvent.getAction() == MotionEvent.ACTION_DOWN) {
            captureImage();
            shareImage();
        }
        return true;
    }
};

My two methods are as follow:

private void captureImage() {
        final int viewWidth = MenuActivity.this.mRenderSurfaceView.getWidth();
        final int viewHeight = MenuActivity.this.mRenderSurfaceView.getHeight();
        screenCapture.capture(viewWidth, viewHeight, FileUtils.getAbsolutePathOnExternalStorage(MenuActivity.this, "screenshot.png"), new IScreenCaptureCallback() {
            @Override
            public void onScreenCaptured(final String pFilePath) {
                MenuActivity.this.runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(MenuActivity.this, "Screenshot: " + pFilePath + " taken!", Toast.LENGTH_SHORT).show();
                    }
                });
            }

            @Override
            public void onScreenCaptureFailed(final String pFilePath, final Exception pException) {
                MenuActivity.this.runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(MenuActivity.this, "FAILED capturing Screenshot: " + pFilePath + " !", Toast.LENGTH_SHORT).show();

                    }
                });
            }
        });
    }

    private void shareImage() {
        Intent shareIntent = new Intent(android.content.Intent.ACTION_SEND); 
        shareIntent.setType("image/png");
        shareIntent.putExtra(android.content.Intent.EXTRA_TEXT, shareMessage);
        shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse(FileUtils.getAbsolutePathOnExternalStorage(MenuActivity.this, "screenshot.png"))); 
        MenuActivity.this.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(MenuActivity.this, "Path: " + Uri.parse(FileUtils.getAbsolutePathOnExternalStorage(MenuActivity.this, "screenshot.png")), Toast.LENGTH_SHORT).show();
            }
        });
        startActivity(Intent.createChooser(shareIntent, "Share via")); 
    }

Thank you in advance.