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Question

I am new to android, How can i insert values from android to php mysql i tried the following code it does not showing any error but not working. can anyone help me. Can anyone correct my mistake.

public class MainActivity extends Activity{

    EditText username, email, password;
    Button btn;
    HttpResponse response;

    public void onCreate(Bundle savedInstanceState){

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        username = (EditText) findViewById(R.id.usr_name);
        email = (EditText) findViewById(R.id.email);
        password = (EditText) findViewById(R.id.password);

        btn = (Button) findViewById(R.id.regbtn);
        btn.setOnClickListener(new View.OnClickListener(){


            public void onClick(View v){

                HttpClient httpclient = new DefaultHttpClient();
                HttpPost httppost = new HttpPost("http://10.0.2.2/androidtest.php");

                try{

                    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                    nameValuePairs.add(new BasicNameValuePair("uname", username.toString()));
                    nameValuePairs.add(new BasicNameValuePair("email", email.getText().toString()));
                    nameValuePairs.add(new BasicNameValuePair("password", password.getText().toString()));

                    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                    response = httpclient.execute(httppost);

                }catch(Exception e){
                    e.printStackTrace();
                }
            }
        });
    }

}

Answer 1

I tested your example on my local VM and for me there was "06-01 00:22:17.671: W/System.err(2024): android.os.NetworkOnMainThreadException" as I commented before.

Dont do networking on the main thread.

An (other) example on how to use async tasks is postet here .

Async Tasks are executed in parallel to the main thread, so they are NOT blocking the main thread. Blocking the main thread is bad because it for example prevents the user interface from beeing redrawn / the interface cant handle input.
Therfore android throws an NetworkOnMainThreadException to prevent you from doing networking (a time consuming tasks) on the main thread.

An example implementation can be found here .

Answer 2

Its probably not working because you are trying to send your message to php on the mainUI thread. Try putting your code into an asynctask like this

class Task extends AsyncTask<Void, Void, Void>{

    @Override
    protected void doInBackground(Void... params){


    HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("http://10.0.2.2/androidtest.php");

            try{

                ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                nameValuePairs.add(new BasicNameValuePair("uname", username.toString()));
                nameValuePairs.add(new BasicNameValuePair("email", email.getText().toString()));
                nameValuePairs.add(new BasicNameValuePair("password", password.getText().toString()));

                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                response = httpclient.execute(httppost);

            }catch(Exception e){
                e.printStackTrace();
            }
    }
}

And then call it like this

new Task().execute();