ClassCastException with new Appium-java TouchActions

This is still an issue in appium, apparently. Right now, the only way to do it in native Android is by an adb command:

adb shell input touchscreen swipe <x> <y> <x> <y> <durationMs>

In Java you can implement this using the following code:

    public static String swipe(int startx, int starty, int endx, int endy, int duration) {
        return executeAsString("adb shell input touchscreen swipe "+startx+" "+starty+" "+endx+" "+endy+" "+duration);
    }

    private static String executeAsString(String command) {
        try {
            Process pr = execute(command);
            BufferedReader input = new BufferedReader(new InputStreamReader(pr.getInputStream()));
            StringBuilder sb = new StringBuilder();
            String line;
            while ((line = input.readLine()) != null) {
                if (!line.isEmpty()) {
                    sb.append(line);
                }
            }
            input.close();
            pr.destroy();
            return sb.toString();
        } catch (Exception e) {
            throw new RuntimeException("Execution error while executing command" + command, e);
        }
    }    

    private static Process execute(String command) throws IOException, InterruptedException {
        List<String> commandP = new ArrayList<>();
        String[] com = command.split(" ");
        for (int i = 0; i < com.length; i++) {
            commandP.add(com[i]);
        }
        ProcessBuilder prb = new ProcessBuilder(commandP);
        Process pr = prb.start();
        pr.waitFor(10, TimeUnit.SECONDS);
        return pr;
    }

However, if you are using an app that has a webview you can better use JavaScript to scroll. The code to scroll down is:

((JavascriptExecutor)driver).executeScript("window.scrollBy(0,500)", "");

Or to scroll up:

((JavascriptExecutor)driver).executeScript("window.scrollBy(0,-500)", "");

Or to scroll to a certain element:

((JavascriptExecutor) driver).executeScript("arguments[0].scrollIntoView(true);", element);

Be sure to switch to the webview context before using this.