CODEWITHSUNDEEP
android
iguana
iguana

Reputation: 77

Android: get as a static String a value from a URL

URL = http://troyka.esy.es/numberofrows.php

if you put that in your browser you'l get a number (currently it's 9)

I'm trying to pull that number to my android app and display it on a textview

I've tried this method but it shows me nothing on the emulator internet and network permission are set on manifest

textview id = "textView"

What am I doing wrong?

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;


public class MainActivity extends Activity {
    public static String ans;
    private TextView T1;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        T1 = new TextView(this);

        T1 = (TextView) findViewById(R.id.textView);
        T1.setText(ans);

    }
    public String getDATA() throws IOException {
        String fullString = "";
        URL url = new URL("http://troyka.esy.es/numberofrows.php");
        BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()));
        String line;
        while ((line = reader.readLine()) != null) {
            fullString += line;
        }
        reader.close();
        return fullString;
    }
    public void setAns() throws IOException {
        ans = getDATA();
    }
}

Upvotes: 1

Views: 1063

Answers (1)

Eenvincible
Eenvincible

Reputation: 5626

Try this answer please:

First, create an AsyncTask class like this to do the actual HTTP request for you outside the android main thread:

public class FetchColumnAsync extends AsyncTask<String, Void, String> 
{
    private Context mContext;

    public FetchColumnAsync( Context ctx){
       this.mContext = ctx; 
    }

    protected String doInBackground(String... urls)
    {
       String fullString = "";
       try{

          URL url = new URL(urls[0]);
          BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()));
          String line;
          while ((line = reader.readLine()) != null) {
             fullString += line;
          }
          reader.close();
        }catch(Exception e ){
           e.getMessage();
        }

        return fullString;
    }

    @Override
    protected void onPostExecute(String value){
       try{
          ((OnValueFetchedListener) mContext).onValueFetched(value);
       }catch(ClassCastException e){}
    }

    public interface OnValueFetchedListener{
        void onValueFetched(String columns);
    }

}

Then in your activity class, implement the above interface like this; 

public class MainActivity extends Activity implements FetchColumnAsync.OnValueFetchedListener{
   public static String ans;
   private TextView T1;

   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);


       T1 = (TextView) findViewById(R.id.textView);

       //missing piece of code here
       new FetchColumnAsync(this).execute("http://troyka.esy.es/numberofrows.php");

   }

   @Override
   public void onValueFetched(String value){
      T1.setText(value);
   }

}

Upvotes: 1

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