问创建一个固定时间后过期的Android试用应用

EN

public class ValidationActivity extends BaseMainActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

@Override
protected void onResume() {
    processCurrentTime();
    super.onResume();
}

private void processCurrentTime() {
    if (!isDataConnectionAvailable(ValidationActivity.this)) {
        showerrorDialog("No Network coverage!");
    } else {
        String urlString = "http://api.timezonedb.com/?zone=Europe/London&key=OY8PYBIG2IM9";
        new CallAPI().execute(urlString);
    }
}

private void showerrorDialog(String data) {
    Dialog d = new Dialog(ValidationActivity.this);
    d.setTitle("LS14");
    TextView tv = new TextView(ValidationActivity.this);
    tv.setText(data);
    tv.setPadding(20, 30, 20, 50);
    d.setContentView(tv);
    d.setOnDismissListener(new OnDismissListener() {
        @Override
        public void onDismiss(DialogInterface dialog) {
            finish();
        }
    });
    d.show();
}

private void checkExpiry(int isError, long timestampinMillies) {
    long base_date = 1392878740000l;// feb_19 13:8 in GMT;
    // long expiryInMillies=1000*60*60*24*5;
    long expiryInMillies = 1000 * 60 * 10;
    if (isError == 1) {
        showerrorDialog("Server error, please try again after few seconds");
    } else {
        System.out.println("fetched time " + timestampinMillies);
        System.out.println("system time -" + (base_date + expiryInMillies));
        if (timestampinMillies > (base_date + expiryInMillies)) {
            showerrorDialog("Demo version expired please contact vendor support");
            System.out.println("expired");
        }
    }
}

private class CallAPI extends AsyncTask<String, String, String> {
    @Override
    protected void onPreExecute() {
        // TODO Auto-generated method stub
        super.onPreExecute();
    }

    @Override
    protected String doInBackground(String... params) {
        String urlString = params[0]; // URL to call
        String resultToDisplay = "";
        InputStream in = null;
        // HTTP Get
        try {
            URL url = new URL(urlString);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            in = new BufferedInputStream(urlConnection.getInputStream());
            resultToDisplay = convertStreamToString(in);
        } catch (Exception e) {
            System.out.println(e.getMessage());
            return e.getMessage();
        }
        return resultToDisplay;
    }

    protected void onPostExecute(String result) {
        int isError = 1;
        long timestamp = 0;
        if (result == null || result.length() == 0 || result.indexOf("<timestamp>") == -1 || result.indexOf("</timestamp>") == -1) {
            System.out.println("Error $$$$$$$$$");
        } else {
            String strTime = result.substring(result.indexOf("<timestamp>") + 11, result.indexOf("</timestamp>"));
            System.out.println(strTime);
            try {
                timestamp = Long.parseLong(strTime) * 1000;
                isError = 0;
            } catch (NumberFormatException ne) {
            }
        }
        checkExpiry(isError, timestamp);
    }

} // end CallAPI

public static boolean isDataConnectionAvailable(Context context) {
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo info = connectivityManager.getActiveNetworkInfo();
    if (info == null)
        return false;

    return connectivityManager.getActiveNetworkInfo().isConnected();
}

public String convertStreamToString(InputStream is) throws IOException {
    if (is != null) {
        Writer writer = new StringWriter();

        char[] buffer = new char[1024];
        try {
            Reader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
            int n;
            while ((n = reader.read(buffer)) != -1) {
                writer.write(buffer, 0, n);
            }
        } finally {
            is.close();
        }
        return writer.toString();
    } else {
        return "";
    }
}

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub

}
}