Show or hide status bar.

StatusBar.java

	private void hideStatusBar() {
		if (Build.VERSION.SDK_INT < 16) {
			hideStatusBarLowVersion();
		} else {
			hideStatusBarHighVersion();
		}
	}

	private void showStatusBar() {
		if (Build.VERSION.SDK_INT < 16) {
			showStatusBarLowVersion();
		} else {
			showStatusBarHighVersion();
		}
	}

	@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
	private void showStatusBarHighVersion() {
		View decorView = getWindow().getDecorView();
		int uiOptions = View.SYSTEM_UI_FLAG_VISIBLE;
		decorView.setSystemUiVisibility(uiOptions);
	}

	private void showStatusBarLowVersion() {
		getWindow().addFlags(
				WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
		getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
	}

	private void hideStatusBarLowVersion() {
		getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
		getWindow().clearFlags(
				WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
	}

	@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
	private void hideStatusBarHighVersion() {
		View decorView = getWindow().getDecorView();
		int uiOptions = View.SYSTEM_UI_FLAG_FULLSCREEN;
		decorView.setSystemUiVisibility(uiOptions);
	}