Rate.java

private void rateApp() {
        final String appPackageName = getPackageName(); // getPackageName() from Context or Activity object
        try {
            startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=" + appPackageName)));
        } catch (android.content.ActivityNotFoundException anfe) {
            startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=" + appPackageName)));
        }
    }

    private void shareApp() {
        final String appPackageName = getPackageName();
        String myUrl = "https://play.google.com/store/apps/details?id=" + appPackageName;

        Intent sendIntent = new Intent();
        sendIntent.setAction(Intent.ACTION_SEND);
        sendIntent.putExtra(Intent.EXTRA_TEXT, myUrl);
        sendIntent.setType("text/plain");
        startActivity(Intent.createChooser(sendIntent, "Share using..."));
    }

    private void moreApp() {
        final String devName = "your-dev-name";
        try {
            startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://developer?id=" + devName)));
        } catch (ActivityNotFoundException anfe) {
            startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/developer?id=" + devName)));
        }
    }