Consuming JSON webservice with the use of AsyncTaks [duplicate]

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Consuming JSON webservice with the use of AsyncTaks [duplicate]

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#1 by (3 votes)

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Well, I'm trying to make an application that logs into a database, I was previously using the thread method to get it working, but at the time of reporting the error messages on the screen or something, it was not. I have modified it to use asyncTaks, but it is continuing to error.

LOG USING ASSYNC:

05-25 08:32:14.444    4091-4091/com.example.hotsystems.hs_celulas E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.hotsystems.hs_celulas, PID: 4091
android.os.NetworkOnMainThreadException
        at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145)
        at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
        at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
        at libcore.io.IoBridge.connect(IoBridge.java:112)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
        at java.net.Socket.connect(Socket.java:843)
        at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
        at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
        at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
        at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
        at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
        at com.example.hotsystems.hs_celulas.Connection.getSetDataWeb(Connection.java:31)
        at com.example.hotsystems.hs_celulas.MainActivity.callServer(MainActivity.java:121)
        at com.example.hotsystems.hs_celulas.MainActivity.access$000(MainActivity.java:17)
        at com.example.hotsystems.hs_celulas.MainActivity$1.onClick(MainActivity.java:51)
        at android.view.View.performClick(View.java:4438)
        at android.view.View$PerformClick.run(View.java:18422)
        at android.os.Handler.handleCallback(Handler.java:733)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5017)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
        at dalvik.system.NativeStart.main(Native Method)

My main code looks like this:

 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_hs_cell);

    //Chamar os objetos
    email = (EditText) findViewById(R.id.TXT_EMAIL_LOGIN);
    senha = (EditText) findViewById(R.id.TXT_SENHA_LOGIN);
    cod_igrej = (EditText) findViewById(R.id.COD_IGREJ_LOGIN);
    entrar = (Button) findViewById(R.id.BTN_ENTRA_APLIC);
    sair = (Button) findViewById(R.id.BTN_SAIRX_APLIC);



    entrar.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) {
            Usuario usr = new Usuario();

            String json = generateJson(usr);
            callServer("send-json", json);

        }
    });

And the part of callServer:

private void callServer(final String method, final String data){
    final ProgressDialog progresso = new ProgressDialog(this);
    progresso.setMessage("Entrando");
    progresso.show();
     asw = Connection.getSetDataWeb("http://192.168.1.20/renan/process.php", method, data);

    new AsyncTask<String, String, String>(){



        protected void onPreExecute(){
            progresso.setMessage("Aguarde");

        }
        protected String doInBackground(String... asw){
            if(asw.equals("3"))
                progresso.setMessage("Creaódigo da igreja inesistente, por favor escreva um código válido.");
            else if (asw.equals("2")){
                progresso.setMessage("Senha incorreto, por favor escreva uma senha válida.");
                // makeText(MainActivity.this, "Senha incorreto, por favor escreva uma senha válida.", LENGTH_SHORT).show();
            }else if (asw.equals("1"))
            {
                progresso.setMessage("E-mail incorreto, por favor escreva um email válido.");
                // makeText(MainActivity.this, "E-mail incorreto, por favor escreva um email válido.", LENGTH_SHORT).show();
            }

            return null;
        }
        protected void onProgressUpdate(){

        }
        protected void onPostExecute(){
            progresso.setMessage("Seja Bem vindo.");
            progresso.show();
            Intent it = new Intent(MainActivity.this, MC_Home.class);
            startActivity(it);
            progresso.dismiss();

        }



         /*public void run(){

            if (data.isEmpty()){
                degenerateJson(asw);
           }

             Atividade_Entrar(asw, null,null);
             //makeText(MainActivity.this, "Código da igreja inesistente, por favor escreva um código válido.", LENGTH_SHORT).show();

        }*/
    }.execute();
   }

}

Class Conection :

package com.example.hotsystems.hs_celulas;

import android.app.Activity;

import java.io.IOException;
import java.util.ArrayList;

import org.apache.http.HttpResponse;
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 org.apache.http.util.EntityUtils;

public class Connection extends Activity{
    public static String getSetDataWeb(String url, String method, String data){

        HttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);
        String answer = "";

        try{
            ArrayList<NameValuePair> valores = new ArrayList<NameValuePair>();
            valores.add(new BasicNameValuePair("method", method));
            valores.add(new BasicNameValuePair("json", data));

            httpPost.setEntity(new UrlEncodedFormEntity(valores));
            HttpResponse resposta = httpClient.execute(httpPost);
            answer = EntityUtils.toString(resposta.getEntity());
        }
        catch(NullPointerException e){ e.printStackTrace(); }
        catch(ClientProtocolException e){ e.printStackTrace(); }
        catch(IOException e){ e.printStackTrace(); }

        return(answer);
    }
}

java android asynctask

asked by anonymous 25.05.2015 / 14:40

1 answer

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score 3 · Accepted Answer

The NetworkOnMainThreadException exception is thrown when a target API level program 11 or higher accesses the internet in the application's main thread .

So I see in your code what is probably (I do not know what this Connection is) causing this to be the line:

asw = Connection.getSetDataWeb("http://192.168.1.20/renan/process.php", method, data);

If this is the case, passing it into the doInBackground method may solve the problem.

As of Api level 9, Android has introduced a to alert the programmer when it inadvertently or not accesses the disk or the network in the application's main thread . This mechanism throws an exception when it does.

This behavior can be disabled by placing the following code in the% method of Activity :

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);

The code that is in the onCreate() method must be executed asynchronously, you must use your AsyncTask to run it.

It should be something like this:

private ProgressDialog progresso = new ProgressDialog(this);

private class GetSetDataWeb extends AsyncTask<Void, Void, String> {

    private String url, method, data;

    public GetSetDataWeb(String url, String method, String data){
        this.url = url;
        this.method = method;
        this.data = data;
    }


    @Override
    protected void onPreExecute() {

        progresso.setMessage("Aguarde...");
        progresso.show();
    }


    protected String doInBackground(Void... params) {
        String answer = "";
        HttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        try{
            ArrayList<NameValuePair> valores = new ArrayList<NameValuePair>();
            valores.add(new BasicNameValuePair("method", method));
            valores.add(new BasicNameValuePair("json", data));

            httpPost.setEntity(new UrlEncodedFormEntity(valores));
            HttpResponse resposta = httpClient.execute(httpPost);
            answer = EntityUtils.toString(resposta.getEntity());
        }
        catch(NullPointerException e){ e.printStackTrace(); }
        catch(ClientProtocolException e){ e.printStackTrace(); }
        catch(IOException e){ e.printStackTrace(); }
        return answer;
    }


    protected void onPostExecute(String result) {
        progresso.dismiss();
        if(result.equals("3")){
            Toast.makeText(MainActivity.this, "Código da igreja inesistente, por favor escreva um código válido.", 
                   Toast.LENGTH_SHORT).show();
             return;
        }else if (result.equals("2")){
            Toast.makeText(MainActivity.this, "Senha incorreto, por favor escreva uma senha válida.", 
                           Toast.LENGTH_SHORT).show();
             return;
        }else if (result.equals("1"))
        {
            progresso.setMessage("E-mail incorreto, por favor escreva um email válido.");
            Toast.makeText(MainActivity.this, "E-mail incorreto, por favor escreva um email válido.",
                           Toast.LENGTH_SHORT).show();
            return;
        }

        Toast.makeText(MainActivity.this, "Seja bem vindo", Toast.LENGTH_SHORT).show();
        Intent it = new Intent(MainActivity.this, MC_Home.class);
        startActivity(it);
    }

}

Place this code in MainActivity and to call the service do so:

new GetSetDataWeb("http://192.168.1.20/renan/process.php", method, data).execute();