Develop Reference

how can I run to background process at once

I' working on an app which among other things preforms a port scan. My problem is that I'm trying to implement a progress bar as the scan takes place. Right now I use AsynTask to perform the scan. But how can I update the progress bar while the scan is performing? Can I use the same AsynTask for both task or I need to implement a separate one. Any help appreciate!
PortScanActivity
package com.example.android.droidscanner;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Adapter;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.net.ConnectException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.SocketTimeoutException;
import java.net.UnknownHostException;
import java.util.ArrayList;
/**
* Created by jlvaz on 3/7/2017.
*/
public class PortScanActivity extends AppCompatActivity{
String ipAddress;
ArrayList<String> openPorts;
ArrayAdapter<String> portAdapter;
int startPort = 0;
int endPort = 1023;
TextView statusMsg;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.scan_list);
Intent portIntent = getIntent();
ipAddress = portIntent.getStringExtra("host");
statusMsg = (TextView) findViewById(R.id.status_msg);
//setting the adapter
ListView portList = (ListView) findViewById(R.id.scan_list);
openPorts = new ArrayList<>();
portAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, openPorts);
portList.setAdapter(portAdapter);
//scanning ports
PortScanTask portScan = new PortScanActivity.PortScanTask();
portScan.execute();
}
private class PortScanTask extends AsyncTask<Void, String, Void> {
int timeOut = 1000; //for how long try connection in ms
#Override
protected void onPreExecute() {
openPorts.clear();
statusMsg.setText("Scanning " + ipAddress + " ports..");
}
#Override
protected Void doInBackground(Void... params) {
for (int i = startPort; i <= endPort; i++) {
try {
//establishing connection to every port
Socket socket = new Socket();
SocketAddress address = new InetSocketAddress(ipAddress, i);
socket.connect(address, timeOut);
Log.v("Connecting to: ", ipAddress + i);
if (socket.isConnected()) {
socket.close();
publishProgress(ipAddress + ": " + i);
}
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (SocketTimeoutException e) {
e.printStackTrace();
} catch (ConnectException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onProgressUpdate(String... values) {
openPorts.add(values[0]);
portAdapter.notifyDataSetInvalidated();
Toast.makeText(getApplicationContext(), values[0].toString() + " open!", Toast.LENGTH_SHORT).show();
}
#Override
protected void onPostExecute(Void aVoid) {
statusMsg.setText("Scan Complete!");
}
}
}

On progress update pass your custom class object which contains both, the string and the progress integer.
class ProgressStep {
int progress;
String address;
}
private class PortScanTask extends AsyncTask<Void, ProgressStep, Void> {
int timeOut = 1000; //for how long try connection in ms
#Override
protected void onPreExecute() {
openPorts.clear();
statusMsg.setText("Scanning " + ipAddress + " ports..");
}
#Override
protected Void doInBackground(Void... params) {
for (int i = startPort; i <= endPort; i++) {
try {
//establishing connection to every port
Socket socket = new Socket();
SocketAddress address = new InetSocketAddress(ipAddress, i);
socket.connect(address, timeOut);
Log.v("Connecting to: ", ipAddress + i);
int progress = count_your_progress;
ProgressStep step = new ProgressStep();
step.progress = progress;
if (socket.isConnected()) {
socket.close();
String address = ipAddress + ": " + i;
step.address = address;
}
publishProgress(step);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (SocketTimeoutException e) {
e.printStackTrace();
} catch (ConnectException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onProgressUpdate(ProgressStep... values) {
ProgressStep step = values[0];
if (step.address != null) {
openPorts.add(step.address);
portAdapter.notifyDataSetInvalidated();
Toast.makeText(getApplicationContext(), step.address + " open!", Toast.LENGTH_SHORT).show();
}
progressBar.setProgress(step.progress);
}
#Override
protected void onPostExecute(Void aVoid) {
statusMsg.setText("Scan Complete!");
}
}

How do I update the database from a checked radio button?

package com.example.admin.userregistrationsample;
import android.app.ProgressDialog;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class Some extends AppCompatActivity implements View.OnClickListener{
private EditText branch;
public TextView list,list2;
Button bt, bt1;
String temp1;
String text1,temp, usn,text;
String res;
String[] parts;
int count;
RadioGroup rg;
RadioButton[] rb;
GetJSON gj = new GetJSON();
LinearLayout mLinearLayout;
private static final String JSON_URL = "http://192.168.43.144/mini1/subject.php";
private static final String SUB_URL = "http://192.168.43.144/mini1/store.php";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_some);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
usn = getIntent().getStringExtra("USN");
bt = (Button) findViewById(R.id.buttonGet);
bt.setOnClickListener(this);
bt1 = (Button) findViewById(R.id.button2);
bt1.setOnClickListener(this);
branch = (EditText) findViewById(R.id.editTextId);
//invokeLogin();
}
//#Override
public void onClick(View v)
{
if (v == bt)
{
invokeLogin();
}
if (v == bt1)
{
register(temp,usn);
}
}
public void invokeLogin()
{
text = branch.getText().toString();
getJSON(text);
}
public void getJSON(String text)
{
final String urlSuffix = "?branch=" + text;
gj.execute(urlSuffix);
}
public class GetJSON extends AsyncTask<String, Void, String> {
ProgressDialog loading;
public GetJSON()
{
}
#Override
public void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(Some.this, "Please Wait...", null, true, true);
}
#Override
public String doInBackground(String... params) {
String uri = params[0];
BufferedReader bufferedReader = null;
try {
URL url = new URL(JSON_URL + uri);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
StringBuilder sb = new StringBuilder();
bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String json;
while ((json = bufferedReader.readLine()) != null) {
sb.append(json).append("\n");
}
return sb.toString().trim();
} catch (Exception e) {
return null;
}
}
#Override
public void onPostExecute(String s)
{
super.onPostExecute(s);
loading.dismiss();
res=s.replaceAll("\"", "");
res = res.replaceAll(",","\n ").replace('[', ' ').replace(']', ' ');
parts = res.split("\n");
count=parts.length;
mLinearLayout = (LinearLayout) findViewById(R.id.linear2);
rb = new RadioButton[count];
rg = new RadioGroup(getBaseContext());
rg.setOrientation(RadioGroup.VERTICAL);
for (int i = 0; i < count; i++)
{
rb[i] = new RadioButton(getBaseContext());
rb[i].setTextColor(Color.parseColor("#000000"));
rb[i].setTextSize(25);
rg.addView(rb[i]);
rb[i].setText(parts[i]);
}
mLinearLayout.addView(rg);
rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
for (int i = 0; i < group.getChildCount(); i++) {
RadioButton btn = (RadioButton) group.getChildAt(i);
if (btn.getId() == checkedId) {
temp1 = (String) btn.getText();
list2 = (TextView) findViewById(R.id.select);
list2.setText(temp);
break;
}
}
}
});
}
}
public void register(String sub ,String usn)
{
String urlSuffix = "?subject=" + sub + "&usn=" +usn;
class RegisterUser extends AsyncTask<String, Void, String> {
ProgressDialog loading;
#Override
public void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(Some.this, "Please Wait", null, true, true);
}
#Override
public void onPostExecute(String s) {
super.onPostExecute(s);
loading.dismiss();
if (s.equals("successfully registered")) {
Toast.makeText(getApplicationContext(), s, Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(), s, Toast.LENGTH_LONG).show();
}
}
#Override
public String doInBackground(String... params) {
String s = params[0];
BufferedReader bufferedReader = null;
try {
URL url = new URL(SUB_URL + s);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String result;
result = bufferedReader.readLine();
return result;
} catch (Exception e) {
return null;
}
}
}
RegisterUser ru=new RegisterUser();
ru.execute(urlSuffix);
}
}
I have retreived the checked radio button value to variable temp. And it is appearing in the TextView but when I pass that value to register function it is not taking the value how to do that? Please anyone help..!

use the following code for use setOnCheckedChangeListener outside the async class.
protected void onPostExecute(String result) {
if(!result.equals("null"){
((your activity name) activity).parseJsonResponse(result);
pDialog.dismiss();
}
}
and add below method in your activity.
public void parseJsonResponse(String result) {
//use setOnCheckedChangeListener here.
}

How to get multiple messages from server in android socket

I am implementing socket programming in android. I am successfully getting data from client and displaying it to the server.
The asynctask is as follows:
public class MyClientTask extends AsyncTask<Void, Void, Void> {
String dstAddress;
int dstPort;
String response = "";
MyClientTask(String addr, int port){
dstAddress = addr;
dstPort = port;
}
#Override
protected Void doInBackground(Void... arg0) {
Socket socket = null;
try {
socket = new Socket(dstAddress, dstPort);
ByteArrayOutputStream byteArrayOutputStream =
new ByteArrayOutputStream(1024);
byte[] buffer = new byte[1024];
int bytesRead;
InputStream inputStream = socket.getInputStream();
/*
* notice:
* inputStream.read() will block if no data return
*/
while ((bytesRead = inputStream.read(buffer)) != -1){
byteArrayOutputStream.write(buffer, 0, bytesRead);
response += byteArrayOutputStream.toString("UTF-8");
}
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
response = "UnknownHostException: " + e.toString();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
response = "IOException: " + e.toString();
}finally{
if(socket != null){
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return null;
}
#Override
protected void onPostExecute(Void result) {
textResponse.setText(response);
super.onPostExecute(result);
}
}
}
The above code gets data from server and write it to the text view. I want to use the same socket to get data multiple times from server, unless a particular button is clicked. But, in doInBackground, we can't use any ui component. I want to change the following component, so that I can recieve multiple data from the server:
socket = new Socket(dstAddress, dstPort);
ByteArrayOutputStream byteArrayOutputStream =
new ByteArrayOutputStream(1024);
byte[] buffer = new byte[1024];
int bytesRead;
InputStream inputStream = socket.getInputStream();
/*
* notice:
* inputStream.read() will block if no data return
*/
while ((bytesRead = inputStream.read(buffer)) != -1){
byteArrayOutputStream.write(buffer, 0, bytesRead);
response += byteArrayOutputStream.toString("UTF-8");
}
I tried to use
onProgressUpdate
but it didn't work either. Please help me to solve this.
Edit 1: the client's main activity :
package com.example.shiza.client;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "CLIENT_MESSAGE";
EditText ip_address;
EditText port_number;
EditText message_client;
Button button_send;
Button button_cancel;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void connect(View view) {
// ip_address = (EditText) findViewById(R.id.ip_address);
// ip_address.setText("192.168.9.100");
// port_number = (EditText) findViewById(R.id.port_number);
// port_number.setText("8080");
message_client = (EditText) findViewById(R.id.message_client);
button_send = (Button)findViewById(R.id.button_send);
button_cancel = (Button)findViewById(R.id.button_cancel);
Log.d(TAG, "connecting to the server.");
// new ConnectToServer(ip_address.getText().toString(), port_number.getText().toString(), message_client,button_send,button_cancel).execute();
new ConnectToServer("192.168.9.100","8080", message_client,button_send,button_cancel).execute();
}
}
class ConnectToServer extends AsyncTask<Void, DataOutputStream, Void> {
private static final String TAG = "CLIENT_MESSAGE";
String ip_address;
int port_number;
EditText message_client;
Button button_send;
Button button_cancel;
boolean send = false;
boolean cancel = false;
public ConnectToServer(String ip_address, String port_number, EditText message_client,Button button_send,Button button_cancel) {
this.ip_address = ip_address;
this.port_number = Integer.parseInt(port_number);
this.message_client = message_client;
this.button_cancel = button_cancel;
this.button_send = button_send;
}
#Override
protected Void doInBackground(Void... params) {
try {
Socket socket = new Socket(ip_address, port_number);
if (LoggerConfig.TAG) {
Log.d(TAG, "the socket is created at " + ip_address);
}
DataOutputStream output = new DataOutputStream(socket.getOutputStream());
while (!cancel )
publishProgress(output);
// output.writeUTF("Hello from string");
if (LoggerConfig.TAG) {
Log.d(TAG, "I have written and closed the loop.");
}
socket.close();
} catch (IOException e) {
if (LoggerConfig.TAG) {
Log.d(TAG, "Could not connect.");
}
e.printStackTrace();
}
return null;
}
#Override
protected void onProgressUpdate(DataOutputStream... values) {
super.onProgressUpdate(values);
button_send.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
send = true;
}
});
button_cancel.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
cancel = true;
}
});
Log.d(TAG, "I am in onProgressUpdate");
if ( send )
{
try {
values[0].writeUTF(message_client.getText().toString());
Log.d(TAG, "I am in onProgressUpdate try.");
} catch (IOException e) {
e.printStackTrace();
Log.d(TAG, "I am in onProgressUpdate catch.");
}
send = false;
}
}
}
The server's main activity:
package com.example.shiza.server;
import android.content.Context;
import android.net.wifi.WifiManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.format.Formatter;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
public class MainActivity extends AppCompatActivity {
TextView ip_address;
TextView client_message;
TextView server_status;
TextView show_client_message;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ip_address = (TextView) findViewById(R.id.ip_address);
client_message = (TextView) findViewById(R.id.get_client_message);
server_status = (TextView) findViewById(R.id.server_status);
show_client_message = (TextView) findViewById(R.id.show_client_message);
WifiManager wm = (WifiManager) getSystemService(WIFI_SERVICE);
String ip = Formatter.formatIpAddress(wm.getConnectionInfo().getIpAddress());
ip_address.setText(ip);
// Making a server socket here
}
public void startServer(View view) {
GetFromClient getFromClient = new GetFromClient(this,server_status,show_client_message);
getFromClient.execute();
}
}
class GetFromClient extends AsyncTask<Void, String, Void> {
Context context;
TextView server_status;
TextView show_client_message;
String TAG = "SERVER_MESSAGE";
String inputFromClient = null;
public GetFromClient(Context context,TextView server_status,TextView show_client_message) {
this.context = context;
this.server_status = server_status;
this.show_client_message = show_client_message;
}
#Override
protected Void doInBackground(Void... params) {
Socket socket;
try {
ServerSocket serverSocket = new ServerSocket(8080);
Log.d(TAG, "Server Socket is starting....");
// server_status.setText("The server is running");
publishProgress("okay");
socket = serverSocket.accept();
DataInputStream input = new DataInputStream(socket.getInputStream());
// Calling the second background task for handling input from server
// Log.d(TAG, "Server Socket is started....");
do
{
try {
Thread.sleep(500);
} catch (InterruptedException ie) {
ie.printStackTrace();
}
inputFromClient = input.readUTF();
publishProgress(inputFromClient);
}
while ( inputFromClient != "bye" );
// publishProgress(2);
socket.close();
} catch (IOException e) {
Log.d(TAG, "I am in catch.");
e.printStackTrace();
}
return null;
}
#Override
protected void onProgressUpdate(String... values) {
super.onProgressUpdate(values);
Log.d(TAG, "I am in onProgress update.");
if ( values[0].equals("okay") )
{
server_status.setText("Server has been started");
server_status.setTextColor(context.getResources().getColor(R.color.green));
}
else
{
show_client_message.setText(values[0]);
}
}
protected void onPostExecute(Void inputFromClient)
{
Log.d(TAG, "I am in onPostExecute.");
server_status.setText("Server is not running");
server_status.setTextColor(context.getResources().getColor(R.color.red));
}
}
I am able to do the messaging but the following loop blocks everything:
do
{
try {
Thread.sleep(500);
} catch (InterruptedException ie) {
ie.printStackTrace();
}
inputFromClient = input.readUTF();
publishProgress(inputFromClient);
}
while ( inputFromClient != "bye" );

You can update your TextView in the doInBackground method using RunUiThread. After receiving the data from server just call
runOnUiThread(new Runnable() {
#Override
public void run() {
//here you update the views
}
});

Cannot display toast in a catch

package com.example.m2mai;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;
public class RetrieveActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_retrieve);
}
public void getStream(View v)
{
new MyAsyncTask().execute();
}
private class MyAsyncTask extends AsyncTask<String, Void, String>
{
ArrayList<String> mNameList = new ArrayList<String>();
public ArrayList<String> atList=new ArrayList<String>();
public ArrayList<String> dataList=new ArrayList<String>();
protected String doInBackground(String... params)
{
return getData();
}
public long getDateTo()
{
EditText toText = (EditText)findViewById(R.id.dateTo);
String To = toText.getText().toString();
DateFormat dateFormatTo = new SimpleDateFormat("dd/MM/yyyy");
Date dateTo = null;
try {
dateTo = dateFormatTo.parse(To);
} catch (java.text.ParseException e) {
.runOnUiThread(new Runnable(){
public void run() {
Toast.makeText(getApplicationContext(),"Please key in the correct input", Toast.LENGTH_LONG).show();
}
});
e.printStackTrace();
}
long timeTo = dateTo.getTime();
new Timestamp(timeTo);
return timeTo/1000;
}
protected String getData()
{
String toTS = ""+getDateTo();
String decodedString="";
String returnMsg="";
String request = "http://api.carriots.com/devices/defaultDevice#eric3231559.eric3231559/streams/?order=-1&max=10&at_to="+toTS;
URL url;
HttpURLConnection connection = null;
try {
url = new URL(request);
connection = (HttpURLConnection) url.openConnection();
connection.addRequestProperty("carriots.apikey", "1234567");
connection.addRequestProperty("Content-Type", "application/json");
connection.setRequestMethod("GET");
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
while ((decodedString = in.readLine()) != null)
{
returnMsg+=decodedString;
}
in.close();
connection.disconnect();
JSONObject nodeRoot = new JSONObject(returnMsg);
JSONArray res = nodeRoot.getJSONArray("result");
for (int i = 0; i < res.length(); i++)
{
JSONObject childJSON = res.getJSONObject(i);
if (childJSON.get("data")!=null)
{
String value = childJSON.getString("data");
dataList.add(value);
JSONObject node=new JSONObject(value);
atList.add(node.get("temperature").toString());
}
}
}
catch (Exception e)
{
e.printStackTrace();
returnMsg=""+e;
}
return returnMsg;
}
protected void onPostExecute(String result)
{
for(int i = 0; i < atList.size(); i++)
{
ListView mainListView = (ListView) findViewById(R.id.listView1);
ArrayAdapter<String> mArrayAdapter = new ArrayAdapter<String>(RetrieveActivity.this,android.R.layout.simple_list_item_1,mNameList);
mainListView.setAdapter(mArrayAdapter);
mNameList.add(atList.get(i).toString());
mArrayAdapter.notifyDataSetChanged();
}
Toast.makeText(getApplicationContext(),result, Toast.LENGTH_SHORT).show();
EditText myData1=(EditText)findViewById(R.id.editText1);
myData1.setText(atList.get(0));
}
}
}
How can I actually display a toast without stoping it? Whenever it falls into the catch it is not responding.
............................................................................................................................................................................................................................................................................

If you are using try-catch in a worker thread and want to display Toast, then I am afraid it is not going to work. You will have to do it in Main(UI) thread.
Try following:
try {
dateTo = dateFormatTo.parse(To);
}
catch (java.text.ParseException e) {
your_activity_context.runOnUiThread(new Runnable(){
public void run() {
Toast.makeText(getApplicationContext(),"Please key in the correct input", Toast.LENGTH_LONG).show();
}
});
e.printStackTrace();
}

Try following:
In getDateTo():
try {
dateTo = dateFormatTo.parse(To);
} catch (java.text.ParseException e) {
runOnUiThread(new Runnable(){
public void run() {
Toast.makeText(getApplicationContext(),"Please key in the correct input", Toast.LENGTH_LONG).show();
}
});
e.printStackTrace();
return -1L; // attention here
}
In getData():
long dateTo = -1L;
if((dateTo = getDateTo()) == -1L){
return null;
}
String toTS = "" + getDateTo();
In onPostExecute:
if(result == null) {
return;
}

Make boolean flag = false; globally.
Inside catch block make flag = true;
Run Toast inside an if block like
if (flag) {
Toast.makeText(this, "Sorry, Couldn't find anything!", Toast.LENGTH_LONG).show();
}
inside your onclick method.

Make a string from a View element

I have two seekbars in my main activity but I can only use one of them at a time, so I need to retrieve a value seekbarx and seekbary, store either of them in a string variable to use it forward. I already used onProgressChange and onStopTrackingTouch but I guess it doesn't hold the value long enough.
This is what I had for the seekbars
package edu.itdurango.servocontrolyun;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.SeekBar.OnSeekBarChangeListener;
public class MainActivity extends Activity {
// TODO: adjust ARDUINO_IP_ADDRESS
public final String ARDUINO_IP_ADDRESS = "192.168.1.71"; //Dirección IP del Arduino Yun
public final String TAG = "ArduinoYun";
public String servo;
private SeekBar SeekBarX; //Barra de búsqueda del eje X
private SeekBar SeekBarY; //Barra de búsqueda del eje Y
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SeekBarX = (SeekBar) findViewById(R.id.barraEjeX);
/*SeekBarX.setOnClickListener(new View.OnClickListener() {
public void onClick(View barraEjeX) {
servo = "servox/";
}
});*/
SeekBarX.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
#Override
public void onStopTrackingTouch(SeekBar barraEjeX) {
}
#Override
public void onStartTrackingTouch(SeekBar barraEjeX) {
}
#Override
public void onProgressChanged(SeekBar barraEjeX, int progressX,
boolean fromUser) {
servo = "servox/";
log("touching X bar. servo = " + servo);
QueueX.offer(progressX);
}
});
SeekBarY = (SeekBar) findViewById(R.id.barraEjeY);
/*SeekBarY.setOnClickListener(new View.OnClickListener() {
public void onClick(View barraEjeY) {
servo = "servoy/";
}
});*/
SeekBarY.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
#Override
public void onStopTrackingTouch(SeekBar barraEjeY) {
}
#Override
public void onStartTrackingTouch(SeekBar barraEjeY) {
}
#Override
public void onProgressChanged(SeekBar barraEjeY, int progressY,
boolean fromUser) {
servo = "servoy/";
log("touching Y bar. servo = " + servo);
QueueY.offer(progressY);
}
});
}
#Override
protected void onStart() {
mStop.set(false);
if(sNetworkThreadSend == null){
sNetworkThreadSend = new Thread(mNetworkRunnableSend);
sNetworkThreadSend.start();
}
super.onStart();
}
#Override
protected void onStop() {
mStop.set(true);
QueueX.clear();
QueueX.offer(-1);
QueueY.clear();
QueueY.offer(-1);
if(sNetworkThreadSend != null) sNetworkThreadSend.interrupt();
super.onStop();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void log(String s){
Log.d(">==< "+TAG+" >==<", s);
}
private ArrayBlockingQueue<Integer> QueueX = new ArrayBlockingQueue<Integer>(100);
private ArrayBlockingQueue<Integer> QueueY = new ArrayBlockingQueue<Integer>(100);
private AtomicBoolean mStop = new AtomicBoolean(false);
private static Thread sNetworkThreadSend = null;
private final Runnable mNetworkRunnableSend = new Runnable() {
#Override
public void run() {
log("starting network thread for sending");
String urlBase = "http://"+ARDUINO_IP_ADDRESS+"/arduino/"+servo;
String url;
try {
while(!mStop.get()){
int val;
if (servo == "servoy/"){
val = QueueY.take();
if(val >= 0){
HttpClient httpClient = new DefaultHttpClient();
url = urlBase.concat(String.valueOf(val));
log("executing httpClient request");
HttpResponse response = httpClient.execute(new HttpGet(url));
log(url);
}
}
if (servo == "servox/"){
val = QueueX.take();
if(val >= 0){
HttpClient httpClient = new DefaultHttpClient();
url = urlBase.concat(String.valueOf(val));
log("executing httpClient request");
HttpResponse response = httpClient.execute(new HttpGet(url));
log(url);
}
}
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
log("returning from network thread for sending");
sNetworkThreadSend = null;
}
};
private static Thread sNetworkThreadReceive = null;
private final Runnable mNetworkRunnableReceive = new Runnable() {
#Override
public void run() {
log("starting network thread for receiving");
String url = "http://"+ARDUINO_IP_ADDRESS+"/data/get/D9";
while(!mStop.get()){
try {
String string = readURL(url);
String value = "";
try {
JSONObject jsonMain = new JSONObject(string);
value = jsonMain.get("value").toString();
log("value = "+value);
} catch (Exception e) {
e.printStackTrace();
}
updateText(value);
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
log("returning from network thread for receiving");
sNetworkThreadReceive = null;
}
};
public void updateText(final String value){
runOnUiThread(new Runnable() {
#Override
public void run() {
TextView textView = (TextView) findViewById(R.id.textView1);
textView.setText(value);
}
});
}
public String readURL(String value){
URL url;
StringBuilder builder = new StringBuilder();
try {
url = new URL(value);
URLConnection yc = url.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null){
builder.append(inputLine);
}
in.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return builder.toString();
}
}
It prints in the LogCat touching Y bar. servo = servoy/ but when I want to use the servo value it prints null.
How can I hold the value for this string?