I'm trying to send data in Android Studio. I'm making a login function. So I need to send data to the Webserver. I already made a Webserver, but I can't because of this error:
Caused by: android.os.NetworkOnMainThreadException
I think that error is pointed at this line:
InputStream is = conn.getInputStream();
I've been struggling for 3 days. Please help.
public class MainActivity extends AppCompatActivity {
EditText id;
EditText pass;
String custid;
String password;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
id=(EditText)findViewById(R.id.idtext);
pass=(EditText)findViewById(R.id.passtext);
}
public void ButtonClick(View view){
custid=id.getText().toString();
password=pass.getText().toString();
Toast.makeText(this, "버튼접근."+custid+password, Toast.LENGTH_SHORT).show();
Properties prop = new Properties();
prop.setProperty("custid", custid);
prop.setProperty("password", password);
String encodedString = encodeString(prop);
URL url = null;
try {
url = new URL ("http://192.168.56.1:9999/SEBank/customer/login.action" + "?" + encodedString);
URLConnection conn = url.openConnection();
conn.setUseCaches(false);
InputStream is = conn.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
char[] buff = new char[512];
int len = -1;
while( (len = br.read(buff)) != -1) {
System.out.print(new String(buff, 0, len));
}
br.close();
} catch (java.io.IOException e) {
e.printStackTrace();
}
}
public String encodeString(Properties params) {
StringBuffer sb = new StringBuffer(256);
Enumeration names = params.propertyNames();
while (names.hasMoreElements()) {
String name = (String) names.nextElement();
String value = params.getProperty(name);
sb.append(URLEncoder.encode(name) + "=" + URLEncoder.encode(value) );
if (names.hasMoreElements()) sb.append("&");
}
return sb.toString();
}
}
You can put this on your code
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
but I think the best solution is using AsyncTasks or Volley
If the error is "android.os.NetworkOnMainThreadException ...", try enclose your code with below snippet:
AsyncTask.execute(new Runnable() {
#Override
public void run() {
InputStream is = conn.getInputStream();
// other code
}
});
Related
I want to receive and send data with a web server but the code does not work
What do I do for this code to work?
Note this code inside onCreate
try {
URL url = new URL("http://myweb.com/");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
InputStream Stream = connection.getInputStream();
InputStreamReader reader = new InputStreamReader(Stream);
BufferedReader b = new BufferedReader(reader);
StringBuilder s = new StringBuilder();
String str ="";
while ((str = b.readLine())!=null) {
s.append(str);
}
String data = s.toString();
TextView myText = (TextView) findViewById(R.id.Text);
myText.setText(data);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Make sure that you do network-related tasks on a separate thread in Android. Also, check that you have the INTERNET permission set.
If you want to then update the UI from another thread, you have to use
runOnUiThread (new Runnable () {
public void run() {
//update ui in here
}
}
All your code runs in Main thread which should be always used for setting up the UI and to listen for UI events such as on click listeners.
Network calls are not allowed on this thread as they might take long time. Use AsyncTask API of android which is designed for running code in separate thread.
Create a class like one below for all GET request tasks.
public class DownloadTask extends AsyncTask<String, Void, Integer> {
private String TAG = "InDownloadTask";
private DownloadCallback callback;
private String data;
public DownloadTask(DownloadCallback cb){
callback = cb;
}
#Override
protected Integer doInBackground(String... params) {
Integer result = 0;
HttpURLConnection urlConnection;
try {
URL url = new URL(params[0]);
urlConnection = (HttpURLConnection) url.openConnection();
int statusCode = urlConnection.getResponseCode();
if (statusCode == 200) {
BufferedReader r = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
StringBuilder response = new StringBuilder();
String line;
while ((line = r.readLine()) != null) {
response.append(line);
}
data = response.toString();
result = 1;
} else {
result = 0;
}
} catch (Exception e) {
Log.d(TAG, e.getLocalizedMessage());
}
return result;
}
#Override
protected void onPostExecute(Integer integer) {
super.onPostExecute(integer);
callback.onFinishDownload(data, integer);
}
}
Create a callback interface that we use for the above class.
public interface DownloadCallback {
public void onFinishDownload(String data, Integer result);
}
Now from your activity onCreate
String url = "http://myweb.com/";
new DownloadTask(new DownloadCallback() {
public void onFinishDownload(String data, Integer result) {
if(result == 1)
myText.setText(data);
else
myText.setText("Error");
}
}).execute(url);
If you have many network related operations, use a Network library such as Volley which will take care of this.
I am trying to get my webview to show a page that is only accesible after i am logged in. but whatever i try i cant get past the login url.
How can i open/show the SEND_VISUM_URL after i login.
this is what i have so far:
String LOGIN_URL = "http://10.35.50.125/BCS/index.php?module=";
String SEND_VISUM_URL = "http://10.35.50.1/BCS/index.php?module=ScanVisa&Action=save";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView)findViewById(R.id.webviewer);
webView.loadUrl(LOGIN_URL);
cookieManager = new CookieManager();
Button login = (Button) findViewById(R.id.PostData);
login.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
new loginTask().execute(getLoginData());
} catch (Exception ex) {
ex.printStackTrace();
}
}
});
}
public class loginTask extends AsyncTask<String, String, String> {
#Override
protected String doInBackground(String... params) {
String loginData = params[0];
String text = "";
BufferedReader reader = null;
// Send data
try {
// Defined URL where to send data
URL login_url = new URL(LOGIN_URL);
// getting cookies:
URLConnection conn = login_url.openConnection();
conn.connect();
// setting cookies
cookieManager.storeCookies(conn);
cookieManager.setCookies(login_url.openConnection());
cookiestring = cookieManager.toString();
Log.d("Cookie in logintask:", cookiestring);
conn.getContent();
conn.setDoOutput(true);
conn.setConnectTimeout(3000);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
try {
wr.write(loginData); //post
wr.flush();
} catch (Exception e) {
e.printStackTrace();
}
// Get the server response
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
if (line.length() > 0) {
sb.append(line + "\n");
if (line == null) {
continue;
}
}
}
text = sb.toString();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
try {
if (reader != null) reader.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
return text;
}
protected void onPostExecute(String line) {
if (!line.contains("I107")) { //I107 is an error code that is returend when a login failed
Toast.makeText(getBaseContext(), "Login succesfull", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getBaseContext(), "Login failed", Toast.LENGTH_LONG).show();
}
}
}
public void setCookies(URLConnection conn) throws IOException {
// let's determine the domain and path to retrieve the appropriate cookies
URL url = conn.getURL();
String domain = getDomainFromHost(url.getHost());
String path = url.getPath();
Map domainStore = (Map)store.get(domain);
if (domainStore == null) return;
StringBuffer cookieStringBuffer = new StringBuffer();
Iterator cookieNames = domainStore.keySet().iterator();
while(cookieNames.hasNext()) {
String cookieName = (String)cookieNames.next();
Map cookie = (Map)domainStore.get(cookieName);
// check cookie to ensure path matches and cookie is not expired
// if all is cool, add cookie to header string
if (comparePaths((String)cookie.get(PATH), path) && isNotExpired((String)cookie.get(EXPIRES))) {
cookieStringBuffer.append(cookieName);
cookieStringBuffer.append("=");
cookieStringBuffer.append((String)cookie.get(cookieName));
if (cookieNames.hasNext()) cookieStringBuffer.append(SET_COOKIE_SEPARATOR);
}
}
try {
conn.setRequestProperty(COOKIE, cookieStringBuffer.toString());
} catch (java.lang.IllegalStateException ise) {
IOException ioe = new IOException("Illegal State! Cookies cannot be set on a URLConnection that is already connected. "
+ "Only call setCookies(java.net.URLConnection) AFTER calling java.net.URLConnection.connect().");
throw ioe;
}
}
any help would be greatly appreciated!
i need your help. I want to send a URL Request, get response and create a JSON Object. My first try was totally wrong. Now I found a tutorial and made a new try.
My Activity looks like:
public class Patienten extends Activity {
//Beacon Elemente
private String UUID;
private String Major;
private String Minor;
private TextView output;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_patienten);
output = (TextView) findViewById(R.id.output);
UpdateBeaconInformation();
Button cmdHit = (Button) findViewById(R.id.cmd_hit);
cmdHit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new JSONTask().execute("//http://kusber-web.de/JsonTest.txt");
}
});
setTitle(Surname + ", " + FirstName);
// output.setText(output.getText().toString() + "Gefundener Patient:\n" + "Name: " + Surname + ", " + FirstName + "\nGeb.-Dat: " + Birthdate);
}
Then I created a new Java Class and built an asyncTask with it. But I can't access to the textview output in onPostExecute to update it.
public class JSONTask extends AsyncTask<String, String, String> {
#Override
protected String doInBackground(String... urls) {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
//http://kusber-web.de/JsonTest.txt
//http://nilsbenning.selfhost.me/PatientFinder.php?beacon_comID=5181f8a3-7354-46ac-b22d-952ec395ab06&beacon_major=12&beacon_minor=249
URL url = new URL(urls[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer();
String line;
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
return buffer.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
output.setText(result);
}
}
What is my mistake? Why I can't access to it? I saw it as a solution here but didn't get it to work:
https://stackoverflow.com/a/12252717/5743912
Hope you can help me now! :)
You probably want to fix this (remove leading slashes):
new JSONTask().execute("//http://kusber-web.de/JsonTest.txt");
In your JSONTask you can reference members of Patienten by using Patienten.this. So in onPostExecute you should change this:
output.setText(result);
to:
Patienten.this.output.setText(result);
URL JSON Parsing Error. Please check my code.
{
"info": "Central Bank of Myanmar",
"description": "Official Website of Central Bank of Myanmar",
"timestamp": "1448611200",
"rates":
{
"USD": "1,300.0",
"CZK": "51.055",
"JPY": "1,060.2",
}
}
Activity code is:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.json_object);
TextView output = (TextView) findViewById(R.id.textView1);
String data = "";
try {
String ka =callURL("http://forex.cbm.gov.mm/api/latest");
JSONObject object = new JSONObject(ka);
JSONObject servicedata = object.getJSONObject("rates");
String USD = servicedata.getString("USD");
data += "USD Currency " + USD +" ";
output.setText(data);
} catch (JSONException e) {
e.printStackTrace();
}
}
Call URL give me error.
public static String callURL(String myURL) {
System.out.println("Requeted URL:" + myURL);
StringBuilder sb = new StringBuilder();
URLConnection urlConn = null;
InputStreamReader in = null;
try {
URL url = new URL(myURL);
urlConn = url.openConnection();
if (urlConn != null)
urlConn.setReadTimeout(60 * 1000);
if (urlConn != null && urlConn.getInputStream() != null) {
in = new InputStreamReader(urlConn.getInputStream(),
Charset.defaultCharset());
BufferedReader bufferedReader = new BufferedReader(in);
if (bufferedReader != null) {
int cp;
while ((cp = bufferedReader.read()) != -1) {
sb.append((char) cp);
}
bufferedReader.close();
}
}
in.close();
} catch (Exception e) {
throw new RuntimeException("Exception while calling URL:"+ myURL, e);
}
return sb.toString();
}
Try with android volly library It is developed by Google.
You can easily convert json to java and vice versa.
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
I put this code under the setContentView and code it work. Thank your advertises.
I spent the time about one day for this.
I got a Class from a friend for a URlCaller class for connecting to a webservice. My assumption was that all will work well, but it contains error below is the J2ME implementation
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package main;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
public class URLCaller extends Thread{
private String url ;
private String action;
private URLEncoder urle;
private String res;
public URLCaller() {
}
public URLCaller(String action,String url) {
urle = new URLEncoder();
this.url = url;
this.action = action;
start();
}
//replace
void authenticate(String action,String url) {
HttpConnection connection = null;
InputStream is = null;
OutputStream os = null;
StringBuffer stringBuffer = new StringBuffer();
try {
connection = (HttpConnection)Connector.open(url);
connection.setRequestMethod(HttpConnection.GET);
connection.setRequestProperty("IF-Modified-Since","20 Jan 2001 16:19:14 GMT");
connection.setRequestProperty("User-Agent","Profile/MIDP-2.0 Confirguration/CLDC-1.0");
connection.setRequestProperty("Content-Language", "en-CA");
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
os = connection.openOutputStream();
is = connection.openDataInputStream();
int ch;
while ((ch = is.read()) != -1) {
stringBuffer.append((char) ch);
}
res = stringBuffer.toString() ;
System.out.println(res);
//textBox = new TextBox("Simple GET Test", stringBuffer.toString(), 1024, 0);
}
catch(Exception e ){
}
finally {
try{
if(is!= null) {
is.close();
}
if(os != null) {
os.close();
}
if(connection != null) {
connection.close();
}
//display.setCurrent(textBox);
}
catch(Exception e ){
}
}
}
void sendSMS(String action,String url) {
HttpConnection connection = null;
InputStream is = null;
OutputStream os = null;
StringBuffer stringBuffer = new StringBuffer();
//TextBox textBox = null;
try {
connection = (HttpConnection)Connector.open(url);
connection.setRequestMethod(HttpConnection.GET);
connection.setRequestProperty("IF-Modified-Since","20 Jan 2001 16:19:14 GMT");
connection.setRequestProperty("User-Agent","Profile/MIDP-2.0 Confirguration/CLDC-1.0");
connection.setRequestProperty("Content-Language", "en-CA");
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
os = connection.openOutputStream();
is = connection.openDataInputStream();
int ch;
while ((ch = is.read()) != -1) {
stringBuffer.append((char) ch);
}
res = stringBuffer.toString() ;
System.out.println(res);
//textBox = new TextBox("Simple GET Test", stringBuffer.toString(), 1024, 0);
}
catch(Exception e ){
}
finally {
try{
if(is!= null) {
is.close();
}
if(os != null) {
os.close();
}
if(connection != null) {
connection.close();
}
//display.setCurrent(textBox);
}
catch(Exception e ){
}
}
}
public void run(){
//http://message url?user=mu&password=my&from=Muyiwa&to=23475061254040&message=i+love+this.
System.out.println(Thread.currentThread().toString() + " is running...") ;
if (action.equals("login")){
System.out.println(action);
authenticate(action,url);
}
else if(action.equals("sendsms")) {
System.out.println(action);
sendSMS(action,url);
}
}
public void callURL(){
HttpConnection c = null;
InputStream is = null;
StringBuffer sb = new StringBuffer();
try{
System.out.println(url);
//url = (urle.encode(url,"UTF-8"));
//System.out.println(url);
c = (HttpConnection)Connector.open(url, Connector.READ_WRITE, true);
c.setRequestMethod(HttpConnection.POST); //default
is = c.openInputStream(); // transition to connected!
int ch = 0;
for(int ccnt=0; ccnt < 150; ccnt++) { // get the title.
ch = is.read();
if (ch == -1){
break;
}
sb.append((char)ch);
}
res = sb.toString();
}catch(Exception e){
e.printStackTrace();
}
}
public String getRes() {
return res;
}
public void setRes(String res) {
this.res = res;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public URLEncoder getUrle() {
return urle;
}
public void setUrle(URLEncoder urle) {
this.urle = urle;
}
}
Ps could someone convert this to an android implementation. Currently facing a deadline
In android there are classes, HttpClient and DefaultHttpClient. So you make a web request using these.
Same as your code make a HttpGet request, And also in Like your J2ME code, instead of Thread class you can use AsyncTask (You can also use Thread, Handler but Asynctask is better to use) to perform a web request in Non-UI thread.
Example:
private class DownloadWebPageTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... urls) {
String response = "";
for (String url : urls) {
DefaultHttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse execute = client.execute(httpGet);
InputStream content = execute.getEntity().getContent();
BufferedReader buffer = new BufferedReader(new InputStreamReader(content));
String s = "";
while ((s = buffer.readLine()) != null) {
response += s;
}
} catch (Exception e) {
e.printStackTrace();
}
}
return response;
}
#Override
protected void onPostExecute(String result) {
textView.setText(result);
}
}
Now from your Android activity code you have to just execute() this DownloadWebPageTask.
Like,
DownloadWebPageTask task = new DownloadWebPageTask();
task.execute(new String[] { url });
For more information look at this Tutorial