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Badly confused with AsyncTask .. someone please help out .. ty

Am creating a form application which allows users to send a message using http POST request..Am getting a android.os.NetworkOnMainThreadException while running my program. I am fairly new to android dev. Can someone help me by rewriting the network related operation in AsyncTask. If someone can rewrite, i can learn how exactly network tasks can be done using Async. Ty
Code:
public class MainActivity extends Activity {
EditText msgTextField;
Button sendButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//make message text field object
msgTextField = (EditText) findViewById(R.id.msgTextField);
//make button object
sendButton = (Button) findViewById(R.id.sendButton);
}
public void send(View v)
{
//get message from message box
String msg = msgTextField.getText().toString();
//check whether the msg empty or not
if(msg.length()>0) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("localhost");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("id", "01"));
nameValuePairs.add(new BasicNameValuePair("name", msg));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
msgTextField.setText(""); //reset the message text field
Toast.makeText(getBaseContext(),"Successfully Booked!!",Toast.LENGTH_SHORT).show();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} else {
//display message if text field is empty
Toast.makeText(getBaseContext(),"All fields are required",Toast.LENGTH_SHORT).show();
}
}
}

any help ??

Hello,
Make a copy of the send(View v) method and name it sendAsync(View v, EditText msgbox).
Like this:
Code:
public Exception sendAsync(View v, EditText msgbox)
{
[B] HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("localhost");[/B]
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("id", "01"));
nameValuePairs.add(new BasicNameValuePair("name", msgbox.getText().toString()));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
return null;
} catch (ClientProtocolException e) {
return e;
} catch (IOException e) {
return e;
}
}
Next, modify the original send(View v) method like this:
Code:
public void send(View v)
{
//get message from message box
String msg = msgTextField.getText().toString();
//check whether the msg empty or not
if(msg.length()>0) {
MyAsyncTask mAsync = new MyAsyncTask(v, getBaseContext(), msgTextField);
mAsync.execute();
} else {
//display message if text field is empty
Toast.makeText(getBaseContext(),"All fields are required",Toast.LENGTH_SHORT).show();
}
}
You can add the below code inside your activity class (outside the onCreate method)
Code:
private class MyAsyncTask extends AsyncTask<String, Void, String> {
View v;
Context context;
EditText msgbox;
Exception e = null;
public MyAsyncTask(View v_, Conext context_, EditText msgbox_){
this.v = v_;
this.context = context_;
this.msgbox = msgbox_;
}
@Override
protected String doInBackground(String... params) {
//Background operation in a separate thread
//Write here your code to run in the background thread
this.e = sendAsync(v, msgbox);
return null;
}
@Override
protected void onPostExecute(String result) {
//Called on Main UI Thread. Executed after the Background operation, allows you to have access to the UI
if(e==null){
//Successful
msgbox.setText(""); //reset the message text field
Toast.makeText(context,"Successfully Booked!!",Toast.LENGTH_SHORT).show();
}
else{
e.printStackTrace();
}
}
@Override
protected void onPreExecute() {
//Called on Main UI Thread. Executed before the Background operation, allows you to have access to the UI
}
@Override
protected void onProgressUpdate(Void... values) {
//Called on Main UI Thread
}
}
However, HttpClient is deprecated for API Level 22 and above, so you should use HttpURLConnection instead. This may help you out for using HttpURLConnection via POST or GET Method.
Now, the doInBackground method, runs in a background thread, automatically created for you, and so we send the data from there, for not crashing the UI (User Interface) of the Android App. If you want, however, to access some UI components, you can do it in the onPostExecute (it is executed after the doInBackground completes) or in the onPreExecute (it is executed before the doInBackground begins). To learn more about the AsyncTask class, check here.
AsyncTask can be used and for other purposes other than sending data over the Internet. In general, you create a class extending the AsyncTask, pass any parameters that you are going to use in the background thread (but not UI components like EditText, you can pass them though, but use them in the onPreExecute or onPostExecute methods, and not in the doInBackground method), and do the stuff you want to run in the background thread inside the doInBackground method. That way, heavy(time consuming) computations or tasks like sending data over the Internet does not make your UI to crash, meaning that the user can press any buttons (for example) without lag or without waiting for the background task to finish.

i tried .. it didnt work for me .. can u give the full code for this please ?
package com.example.formpost;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
EditText msgTextField;
Button sendButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.form);
//make message text field object
msgTextField = (EditText) findViewById(R.id.msgTextField);
//make button object
sendButton = (Button) findViewById(R.id.sendButton);
}
public void send(View v)
{
//get message from message box
String msg = msgTextField.getText().toString();
//check whether the msg empty or not
if(msg.length()>0) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("serverside-script.php");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("id", "01"));
nameValuePairs.add(new BasicNameValuePair("message", msg));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
msgTextField.setText(""); //reset the message text field
Toast.makeText(getBaseContext(),"Sent",Toast.LENGTH_SHORT).show();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} else {
//display message if text field is empty
Toast.makeText(getBaseContext(),"All fields are required",Toast.LENGTH_SHORT).show();
}
}
}
Click to expand...
Click to collapse
Thanks bro

I just made a correction on the sendAsync method. It should be as follows (I have also updated my initial post):
Code:
public Exception sendAsync(View v, EditText msgbox)
{
[B] HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("localhost");[/B]
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("id", "01"));
nameValuePairs.add(new BasicNameValuePair("name", msgbox.getText().toString()));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
return null;
} catch (ClientProtocolException e) {
return e;
} catch (IOException e) {
return e;
}
}
(Replace "localhost" with the actual URL that will handle the POST HTTP request). Also if you are on a local network (LAN), and trying to access the localhost of your PC that is connected to the same LAN as your Android smartphone, then, you should find the local internal IP of your computer, e.g. 192.168.1.1 (you can find that from the command prompt by typing: ipconfig). It's the IPv4 Address on your ethernet or wifi (whatever connection your PC has to the router).
Also make sure that your firewall does not block the connection.
Hope it works. What is the error that you get?

try using volley library for http requests .just a few bunch of line. no need of using async tasks.it will handle it automatically
Sent from my Nexus 4 using Tapatalk

jaison thomas said:
try using volley library for http requests .just a few bunch of line. no need of using async tasks.it will handle it automatically
Sent from my Nexus 4 using Tapatalk
Click to expand...
Click to collapse
Since am new to this whole thing, i wanted to learn with this. It was the only tutorial project i could see. Its been depreciated, but still for learning purpose i wanted to execute it. Still no success.

App lags and freeze badly.

is it because of many operations executing from main UI ?
In my app i just have a splash screen and a main activity. In the main thread i have three EditText boxes and a spinner with a string array. On clicking the Button, input from three EditText and spinner selection is posted to my mysql database. For the button click network operation, i used Volley since its east and i dont have to use AsyncTask which am not familiar with.
Apart from this, on entering the main UI .. app first check for network connectivity using ConnectivityManager class. After onClick app checks for empty/invalid imputs using TextUtils.
Now the problem is that when i run my app, its very slow and taking upto 65mb of RAM. IS something wrong with my code. Should i run something else as AsynTask ? Can someone check my code and refine it .. thank you
SplashActivity.java
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
public class SplashActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
int SPLASH_TIME_OUT = 5000;
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent i = new Intent(SplashActivity.this, MainActivity.class);
startActivity(i);
finish();
}
}, SPLASH_TIME_OUT);
}
}
Click to expand...
Click to collapse
MainActivity.java
Code:
public class MainActivity extends Activity {
EditText name, phonenumber, address;
Button insert;
RequestQueue requestQueue;
Spinner spinner;
String insertUrl = "localhost";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Spinner s = (Spinner) findViewById(R.id.spinner);
s.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
/* CHECK INTERNET CONNECTION */
boolean mobileNwInfo;
ConnectivityManager conxMgr = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
try { mobileNwInfo = conxMgr.getActiveNetworkInfo().isConnected(); }
catch (NullPointerException e) { mobileNwInfo = false; }
if (!mobileNwInfo) {
Toast.makeText(this, "No Network, please check your connection. ", Toast.LENGTH_LONG).show();
}
/* CHECK INTERNET CONNECTION PROCEDURE DONE */
name = (EditText) findViewById(R.id.editText);
phonenumber= (EditText) findViewById(R.id.editText2);
address = (EditText) findViewById(R.id.editText3);
insert = (Button) findViewById(R.id.insert);
requestQueue = Volley.newRequestQueue(getApplicationContext());
spinner = (Spinner) findViewById(R.id.spinner);
insert.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
/* CHECK EMPTY STRING */
EditText txtUserName = (EditText) findViewById(R.id.editText);
EditText txtUserAddress = (EditText) findViewById(R.id.editText3);
EditText txtUserPhone = (EditText) findViewById(R.id.editText2);
String strUserName = name.getText().toString();
String strUserAddress = address.getText().toString();
String strUserPhone = phonenumber.getText().toString();
if(TextUtils.isEmpty(strUserName)) {
txtUserName.setError("You can't leave this empty.");
return;
}
if(TextUtils.isEmpty(strUserPhone)) {
txtUserPhone.setError("You can't leave this empty.");
return;
}
if(TextUtils.isEmpty(strUserPhone) || strUserPhone.length() < 10) {
txtUserPhone.setError("Enter a valid phone number.");
return;
}
if(TextUtils.isEmpty(strUserAddress)) {
txtUserAddress.setError("You can't leave this empty.");
return;
}
/* LOADING PROCESS DIALOG */
final ProgressDialog pd = new ProgressDialog(MainActivity.this);
pd.setMessage("Booking Service ....");
pd.show();
/* REQUEST RESPONSE/ERROR */
StringRequest request = new StringRequest(Request.Method.POST, insertUrl, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
pd.hide();
System.out.println(response);
name.setText("");
phonenumber.setText("");
address.setText("");
Toast.makeText(getApplicationContext(), "Service successfully booked !!", Toast.LENGTH_LONG).show();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
pd.hide();
Toast.makeText(getApplicationContext(), "Error: Please try again later.", Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> parameters = new HashMap<>();
parameters.put("name", name.getText().toString());
parameters.put("phonenumber", phonenumber.getText().toString());
parameters.put("address", address.getText().toString());
parameters.put("service", spinner.getItemAtPosition(spinner.getSelectedItemPosition()).toString());
return parameters;
}
};
requestQueue.add(request);
}
});
}
}

Help please : )

Hello everyone,
I have a quick question.
Can someone help me with an algorithm that will:
1. Sort incoming data from Arduino transfered via Bluetooth to the Android App.
2. Sort for example, if i have 1000 data but i only want the important ones that I use to compare with my file.
Thank you guys in advance,
Cookie

cookiey89 said:
Hello everyone,
I have a quick question.
Can someone help me with an algorithm that will:
1. Sort incoming data from Arduino transfered via Bluetooth to the Android App.
2. Sort for example, if i have 1000 data but i only want the important ones that I use to compare with my file.
Thank you guys in advance,
Cookie
Click to expand...
Click to collapse
You'll need a script for that, so keep asking for help because I am unable to
Envoyé de mon SM-G928F en utilisant Tapatalk

You're probably not looking for a specific algorithm, but rather for some technical guidance? How far along are you? Did you get the Bluetooth connection between the two to work? Are you building your own app?

cookiey89 said:
Hello everyone,
I have a quick question.
Can someone help me with an algorithm that will:
1. Sort incoming data from Arduino transfered via Bluetooth to the Android App.
2. Sort for example, if i have 1000 data but i only want the important ones that I use to compare with my file.
Thank you guys in advance,
Cookie
Click to expand...
Click to collapse
Assuming your data is simply some numbers, you can put them in ArrayList and then sort them using Collections.sort() function. For example if you want to get 3 greatest numbers , you can do something like that:
Code:
List<Integer> data = new ArrayList<>();
data.add(5);
data.add(10);
data.add(3);
data.add(20);
data.add(1);
data.add(6);
Collections.sort(data, Comparator.reverseOrder());
List<Integer> topNumbers = data.subList(0, 3);
System.out.println("Top 3 numbers: " + topNumbers);
If you need something more complex, please provide some more information about your data and what you mean by "important"

Hi Everyone,
thank you for the fast responses.
This is my initial plan:
I want to gather data from Arduino via bluetooth to the android app.
From there, I want to "sort" the data in such a way to minimize and specify the data I want to compare to a library.
The data will be analog values from various sensors on the Arduino.
Thanks
Cookie

cookiey89 said:
Hello everyone,
I have a quick question.
Can someone help me with an algorithm that will:
1. Sort incoming data from Arduino transfered via Bluetooth to the Android App.
2. Sort for example, if i have 1000 data but i only want the important ones that I use to compare with my file.
Thank you guys in advance,
Cookie
Click to expand...
Click to collapse
i think , to make that solutions works, you need to insert the datas to database first..
cmiiw

It's Java code of main activity:
package com.example.bluetooth1;
import java.io.IOException;
import java.iutputStream;
import java.lang.reflect.Method;
import java.util.UUID;
import com.example.bluetooth1.R;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
private static final String TAG = "bluetooth1";
Button btnOn, btnOff;
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;
// SPP UUID service
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// MAC-address of Bluetooth module (you must edit this line)
private static String address = "00:15:FF:F2:19:5F";
/** Called when the activity is first created. */
@override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnOn = (Button) findViewById(R.id.btnOn);
btnOff = (Button) findViewById(R.id.btnOff);
btAdapter = BluetoothAdapter.getDefaultAdapter();
checkBTState();
btnOn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
sendData("1");
Toast.makeText(getBaseContext(), "Turn on LED", Toast.LENGTH_SHORT).show();
}
});
btnOff.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
sendData("0");
Toast.makeText(getBaseContext(), "Turn off LED", Toast.LENGTH_SHORT).show();
}
});
}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
if(Build.VERSION.SDK_INT >= 10){
try {
final Method m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
return (BluetoothSocket) m.invoke(device, MY_UUID);
} catch (Exception e) {
Log.e(TAG, "Could not create Insecure RFComm Connection",e);
}
}
return device.createRfcommSocketToServiceRecord(MY_UUID);
}
@override
public void onResume() {
super.onResume();
Log.d(TAG, "...onResume - try connect...");
// Set up a pointer to the remote node using it's address.
BluetoothDevice device = btAdapter.getRemoteDevice(address);
// Two things are needed to make a connection:
// A MAC address, which we got above.
// A Service ID or UUID. In this case we are using the
// UUID for SPP.
try {
btSocket = createBluetoothSocket(device);
} catch (IOException e1) {
errorExit("Fatal Error", "In onResume() and socket create failed: " + e1.getMessage() + ".");
}
// Discovery is resource intensive. Make sure it isn't going on
// when you attempt to connect and pass your message.
btAdapter.cancelDiscovery();
// Establish the connection. This will block until it connects.
Log.d(TAG, "...Connecting...");
try {
btSocket.connect();
Log.d(TAG, "...Connection ok...");
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
}
}
// Create a data stream so we can talk to server.
Log.d(TAG, "...Create Socket...");
try {
outStream = btSocket.getOutputStream();
} catch (IOException e) {
errorExit("Fatal Error", "In onResume() and output stream creation failed:" + e.getMessage() + ".");
}
}
@override
public void onPause() {
super.onPause();
Log.d(TAG, "...In onPause()...");
if (outStream != null) {
try {
outStream.flush();
} catch (IOException e) {
errorExit("Fatal Error", "In onPause() and failed to flush output stream: " + e.getMessage() + ".");
}
}
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
}
}
private void checkBTState() {
// Check for Bluetooth support and then check to make sure it is turned on
// Emulator doesn't support Bluetooth and will return null
if(btAdapter==null) {
errorExit("Fatal Error", "Bluetooth not support");
} else {
if (btAdapter.isEnabled()) {
Log.d(TAG, "...Bluetooth ON...");
} else {
//Prompt user to turn on Bluetooth
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
}
private void errorExit(String title, String message){
Toast.makeText(getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
finish();
}
private void sendData(String message) {
byte[] msgBuffer = message.getBytes();
Log.d(TAG, "...Send data: " + message + "...");
try {
outStream.write(msgBuffer);
} catch (IOException e) {
String msg = "In onResume() and an exception occurred during write: " + e.getMessage();
if (address.equals("00:00:00:00:00:00"))
msg = msg + ".\n\nUpdate your server address from 00:00:00:00:00:00 to the correct address on line 35 in the java code";
msg = msg + ".\n\nCheck that the SPP UUID: " + MY_UUID.toString() + " exists on server.\n\n";
errorExit("Fatal Error", msg);
}
}
}

MihaelYank said:
It's Java code of main activity:
package com.example.bluetooth1;
import java.io.IOException;
import java.iutputStream;
import java.lang.reflect.Method;
import java.util.UUID;
import com.example.bluetooth1.R;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
private static final String TAG = "bluetooth1";
Button btnOn, btnOff;
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;
// SPP UUID service
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// MAC-address of Bluetooth module (you must edit this line)
private static String address = "00:15:FF:F2:19:5F";
/** Called when the activity is first created. */
@override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnOn = (Button) findViewById(R.id.btnOn);
btnOff = (Button) findViewById(R.id.btnOff);
btAdapter = BluetoothAdapter.getDefaultAdapter();
checkBTState();
btnOn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
sendData("1");
Toast.makeText(getBaseContext(), "Turn on LED", Toast.LENGTH_SHORT).show();
}
});
btnOff.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
sendData("0");
Toast.makeText(getBaseContext(), "Turn off LED", Toast.LENGTH_SHORT).show();
}
});
}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
if(Build.VERSION.SDK_INT >= 10){
try {
final Method m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
return (BluetoothSocket) m.invoke(device, MY_UUID);
} catch (Exception e) {
Log.e(TAG, "Could not create Insecure RFComm Connection",e);
}
}
return device.createRfcommSocketToServiceRecord(MY_UUID);
}
@override
public void onResume() {
super.onResume();
Log.d(TAG, "...onResume - try connect...");
// Set up a pointer to the remote node using it's address.
BluetoothDevice device = btAdapter.getRemoteDevice(address);
// Two things are needed to make a connection:
// A MAC address, which we got above.
// A Service ID or UUID. In this case we are using the
// UUID for SPP.
try {
btSocket = createBluetoothSocket(device);
} catch (IOException e1) {
errorExit("Fatal Error", "In onResume() and socket create failed: " + e1.getMessage() + ".");
}
// Discovery is resource intensive. Make sure it isn't going on
// when you attempt to connect and pass your message.
btAdapter.cancelDiscovery();
// Establish the connection. This will block until it connects.
Log.d(TAG, "...Connecting...");
try {
btSocket.connect();
Log.d(TAG, "...Connection ok...");
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
}
}
// Create a data stream so we can talk to server.
Log.d(TAG, "...Create Socket...");
try {
outStream = btSocket.getOutputStream();
} catch (IOException e) {
errorExit("Fatal Error", "In onResume() and output stream creation failed:" + e.getMessage() + ".");
}
}
@override
public void onPause() {
super.onPause();
Log.d(TAG, "...In onPause()...");
if (outStream != null) {
try {
outStream.flush();
} catch (IOException e) {
errorExit("Fatal Error", "In onPause() and failed to flush output stream: " + e.getMessage() + ".");
}
}
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
}
}
private void checkBTState() {
// Check for Bluetooth support and then check to make sure it is turned on
// Emulator doesn't support Bluetooth and will return null
if(btAdapter==null) {
errorExit("Fatal Error", "Bluetooth not support");
} else {
if (btAdapter.isEnabled()) {
Log.d(TAG, "...Bluetooth ON...");
} else {
//Prompt user to turn on Bluetooth
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
}
private void errorExit(String title, String message){
Toast.makeText(getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
finish();
}
private void sendData(String message) {
byte[] msgBuffer = message.getBytes();
Log.d(TAG, "...Send data: " + message + "...");
try {
outStream.write(msgBuffer);
} catch (IOException e) {
String msg = "In onResume() and an exception occurred during write: " + e.getMessage();
if (address.equals("00:00:00:00:00:00"))
msg = msg + ".\n\nUpdate your server address from 00:00:00:00:00:00 to the correct address on line 35 in the java code";
msg = msg + ".\n\nCheck that the SPP UUID: " + MY_UUID.toString() + " exists on server.\n\n";
errorExit("Fatal Error", msg);
}
}
}
Click to expand...
Click to collapse
Thank you, I will try it out

andihong said:
i think , to make that solutions works, you need to insert the datas to database first..
cmiiw
Click to expand...
Click to collapse
Can I place the incoming data values into an array? I will referesh the array everytime the array finishes with the code

maddoc42 said:
You're probably not looking for a specific algorithm, but rather for some technical guidance? How far along are you? Did you get the Bluetooth connection between the two to work? Are you building your own app?
Click to expand...
Click to collapse
Hi,
Yes i'm building my own app. We have split the work. Im responsible for the app development side.

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}

I've drafted a state diagram of how I want my app to function.
Can anyone give me a hand on starting to implement this? I am fairly new to coding-just self learning.
Thanks,
Cookie :fingers-crossed:

Black screen and app shutdown when trying to go back to the previous activity/view

When i run my script below everything works fine. When i want to go back to the previous activity i get a black screen on the emulator and then the app shuts down, i also get a black screen when i exit the application and try to resume it.
The script:
Code:
package com.example.bono.as3;
import android.app.Activity;
import android.content.Context;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import java.io.IOException;
import java.io.InputStream;
public class Main extends Activity {
DrawView drawView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
drawView = new DrawView(this);
setContentView(drawView);
}
@Override public void onResume(){
super.onResume();
drawView.resume();
}
@Override public void onPause(){
super.onPause();
drawView.pause();
}
public class DrawView extends SurfaceView implements Runnable{
Thread gameloop = new Thread();
SurfaceHolder surface;
volatile boolean running = false;
AssetManager assets = null;
BitmapFactory.Options options = null;
Bitmap incect[];
int frame = 0;
public DrawView(Context context){
super(context);
surface = getHolder();
assets = context.getAssets();
options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
incect = new Bitmap[2];
try {
for (int n = 0; n < incect.length; n++){
String filename = "incect"+Integer.toString(n+1)+".png";
InputStream istream = assets.open(filename);
incect[n] = BitmapFactory.decodeStream(istream,null,options);
istream.close();
}
} catch (IOException e){
e.printStackTrace();
}
}
public void resume(){
running = true;
gameloop = new Thread(this);
gameloop.start();
}
public void pause(){
running = false;
while (true){
try {
gameloop.join();
}
catch (InterruptedException e){}
}
}
@Override public void run (){
while (running){
if (!surface.getSurface().isValid())
continue;
Canvas canvas = surface.lockCanvas();
canvas.drawColor(Color.rgb(85, 107, 47));
canvas.drawBitmap(incect[frame], 0, 0, null);
surface.unlockCanvasAndPost(canvas);
frame++;
if (frame > 1) frame = 0;
try {
Thread.sleep(500);
} catch (InterruptedException e){
e.printStackTrace();
}
}
}
}
}
I dont get any error message in the log, what i do get is about 13 messages saying "suspending all threads took: X ms" so it has something to the with my gameloop Thread i think. Unfortunately i dont see what the problem is in my code... Can anyone help me with this?

Bluetooth receive program

Hello.
I`m almost getting to the end of my Sound bar project (2 arduinos, relays, digital potentiometers, leds, i2c, bluetooth and ir remote, diy amplifier,...) and I`m stuck.
This is my first time using android studio and things are becoming so hard for me.
I created an app with a few buttons, switch, sliders and dropdown menu that connects to bluetooth module and sends values to my arduino.
Now I need to add a script that would receive values that arduino is sending (got arduino code done), and would eventualy set buttons clickable/unclickable and set slider positions depending on values being received thru bluetooth.
Can somebody please show me the way to read values from bluetooth and store them in integer or something so that buttons could be disabled and enabled with if(integer=x); statements.
I will post my java code (App is almost done, excepet for sliders and this bluetooth receive part) and I will post the code I came with so far...
JavaScript:
package com.interface80.soundbarcontrol;
import androidx.appcompat.app.AppCompatActivity;
import android.content.pm.ActivityInfo;
import android.icu.text.Transliterator;
import android.os.Build;
import android.os.*;
import android.os.Bundle;
import android.app.Activity;
import android.app.ProgressDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.AsyncTask;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.widget.Switch;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.util.Set;
import java.util.UUID;
public class Remote extends Activity implements AdapterView.OnItemSelectedListener {
private static final String TAG = "BlueTest5-Controlling";
private int mMaxChars = 50000;//Default//change this to string..........
private UUID mDeviceUUID;
private BluetoothSocket mBTSocket;
private ReadInput mReadThread = null;
private boolean mIsUserInitiatedDisconnect = false;
private boolean mIsBluetoothConnected = false;
private int mLastSpinnerPosition = 0;
private Button mBtnDisconnect;
private BluetoothDevice mDevice;
final static String on="92";//on
final static String off="79";//off
final static String subon="10";//subon
final static String suboff="15";//suboff
final static String zero="20";//zeroDB
final static String six="25";//sixDB
final static String twelwe="30";//twelweDB
final static String userBoost="40";
final static String softBoost="45";
final static String normalBoost="50";
final static String hardBoost="55";
final static String overloadOn="60";
final static String overloadOff="65";
Switch toggle; //outside oncreate
private ProgressDialog progressDialog;
Button btnon,btnoff, btnsubon, btnsuboff, btnzero, btnsix, btntwelwe;
Switch overloadSwitch;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_remote);
Spinner spinnerPresets = (Spinner) findViewById(R.id.spinnerPresets);
ArrayAdapter<String> adapterPresets = new ArrayAdapter<String>(Remote.this,
android.R.layout.simple_list_item_1, getResources().getStringArray(R.array.arrayPresets));
adapterPresets.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerPresets.setAdapter(adapterPresets);
spinnerPresets.setOnItemSelectedListener(this);
ActivityHelper.initialize(this);
// mBtnDisconnect = (Button) findViewById(R.id.btnDisconnect);
btnon = (Button) findViewById(R.id.on);
btnoff = (Button) findViewById(R.id.off);
btnsubon = (Button) findViewById(R.id.subon);
btnsuboff = (Button) findViewById(R.id.suboff);
btnzero = (Button) findViewById(R.id.zero);
btnsix = (Button) findViewById(R.id.six);
btntwelwe = (Button) findViewById(R.id.twelwe);
overloadSwitch = (Switch) findViewById(R.id.overloadSwitch);
Intent intent = getIntent();
Bundle b = intent.getExtras();
mDevice = b.getParcelable(MainActivity.DEVICE_EXTRA);
mDeviceUUID = UUID.fromString(b.getString(MainActivity.DEVICE_UUID));
mMaxChars = b.getInt(MainActivity.BUFFER_SIZE);
Log.d(TAG, "Ready");
btnon.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
mBTSocket.getOutputStream().write(on.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
btnoff.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
mBTSocket.getOutputStream().write(off.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
btnsubon.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
mBTSocket.getOutputStream().write(subon.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
btnsuboff.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
mBTSocket.getOutputStream().write(suboff.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
btnzero.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
mBTSocket.getOutputStream().write(zero.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
btnsix.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
mBTSocket.getOutputStream().write(six.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
btntwelwe.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
mBTSocket.getOutputStream().write(twelwe.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String text = parent.getItemAtPosition(position).toString();
if (mLastSpinnerPosition == position)
{
return;
}
mLastSpinnerPosition = position;
if (0 == position) {
Toast.makeText(parent.getContext(), "Boost controlled by user.", Toast.LENGTH_SHORT).show();
btnzero.setEnabled(true);
btnsix.setEnabled(true);
btntwelwe.setEnabled(true);
try {
mBTSocket.getOutputStream().write(userBoost.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return; //do nothing
}
if (1 == position) {
try {
mBTSocket.getOutputStream().write(softBoost.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Toast.makeText(parent.getContext(), "DynaBoost control.", Toast.LENGTH_SHORT).show();
btnzero.setEnabled(false);
btnsix.setEnabled(false);
btntwelwe.setEnabled(false);
return; //do nothing
}
if (2 == position) {
try {
mBTSocket.getOutputStream().write(normalBoost.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Toast.makeText(parent.getContext(), "DynaBoost control.", Toast.LENGTH_SHORT).show();
btnzero.setEnabled(false);
btnsix.setEnabled(false);
btntwelwe.setEnabled(false);
return; //do nothing
}
if (3 == position) {
try {
mBTSocket.getOutputStream().write(hardBoost.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Toast.makeText(parent.getContext(), "DynaBoost control.", Toast.LENGTH_SHORT).show();
btnzero.setEnabled(false);
btnsix.setEnabled(false);
btntwelwe.setEnabled(false);
return; //do nothing
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
private class ReadInput implements Runnable {
private boolean bStop = false;
private Thread t;
public ReadInput() {
t = new Thread(this, "Input Thread");
t.start();
}
public boolean isRunning() {
return t.isAlive();
}
@Override
public void run() {
InputStream inputStream;
try {
inputStream = mBTSocket.getInputStream();
while (!bStop) {
byte[] buffer = new byte[256];
if (inputStream.available() > 0) {
inputStream.read(buffer);
int i = 0;
/*
* This is needed because new String(buffer) is taking the entire buffer i.e. 256 chars on Android 2.3.4 http://stackoverflow.com/a/8843462/1287554
*/
for (i = 0; i < buffer.length && buffer[i] != 0; i++) {
}
final String strInput = new String(buffer, 0, i);
/*
* If checked then receive text, better design would probably be to stop thread if unchecked and free resources, but this is a quick fix
*/
}
Thread.sleep(500);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void stop() {
bStop = true;
}
}
private class DisConnectBT extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
}
@Override
protected Void doInBackground(Void... params) {//cant inderstand these dotss
if (mReadThread != null) {
mReadThread.stop();
while (mReadThread.isRunning())
; // Wait until it stops
mReadThread = null;
}
try {
mBTSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
mIsBluetoothConnected = false;
if (mIsUserInitiatedDisconnect) {
finish();
}
}
}
private void msg(String s) {
Toast.makeText(getApplicationContext(), s, Toast.LENGTH_SHORT).show();
}
@Override
protected void onPause() {
if (mBTSocket != null && mIsBluetoothConnected) {
new DisConnectBT().execute();
}
Log.d(TAG, "Paused");
super.onPause();
}
@Override
protected void onResume() {
if (mBTSocket == null || !mIsBluetoothConnected) {
new ConnectBT().execute();
}
Log.d(TAG, "Resumed");
super.onResume();
}
@Override
protected void onStop() {
Log.d(TAG, "Stopped");
super.onStop();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
// TODO Auto-generated method stub
super.onSaveInstanceState(outState);
}
private class ConnectBT extends AsyncTask<Void, Void, Void> {
private boolean mConnectSuccessful = true;
@Override
protected void onPreExecute() {
progressDialog = ProgressDialog.show(Remote.this, "", "Connecting");// http://stackoverflow.com/a/11130220/1287554
}
@Override
protected Void doInBackground(Void... devices) {
try {
if (mBTSocket == null || !mIsBluetoothConnected) {
mBTSocket = mDevice.createInsecureRfcommSocketToServiceRecord(mDeviceUUID);
BluetoothAdapter.getDefaultAdapter().cancelDiscovery();
mBTSocket.connect();
}
} catch (IOException e) {
// Unable to connect to device`
// e.printStackTrace();
mConnectSuccessful = false;
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (!mConnectSuccessful) {
Toast.makeText(getApplicationContext(), "Could not connect.Please turn on Sound bar", Toast.LENGTH_LONG).show();
finish();
} else {
msg("Connected to Sound bar");
mIsBluetoothConnected = true;
mReadThread = new ReadInput(); // Kick off input reader
}
progressDialog.dismiss();
}
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
}
public void toggle( View View) //outside oncreate
{
if( overloadSwitch.isChecked() ){
try {
mBTSocket.getOutputStream().write(overloadOn.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return; //do nothing
}
else
{
try {
mBTSocket.getOutputStream().write(overloadOff.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return; //do nothing
}
}
}
Code:
TextView cmd = (TextView)findViewById(R.id.cmd); //Would like to show value in textbox for easier debugging.
Don`t know what to write here to make command executing all the time. (onCreate maybe?).
mmSocket = socket;
mRx = new ArrayList<Byte>();
InputStream tmpIn = null;
try {
tmpIn = socket.getInputStream();
} catch (IOException e) {
e.printStackTrace();
}
cmd.setText(//I don`t know what to put in here to display value of tmpIn//);
mmInStream = tmpIn; //Is tmpIn an integer and stores values received from bt? I assume so.
I`m going nust on this one
Thank you fo r help

The code was already there. Under void run, I just had to use strInput string.