Java Not Playing Songs Within A function?

[Spudster]

I am fairly new to java Ive only started yesterday I do have programming background with PHP! C++,HTML,CSS and Java Script.

Anyway I have written this out for an android development application and its not working, I want it to play a song it does it when Its inserted up the top of the page but not in a certain bracket, More info in in //Commenting in tne code

PHP Code:

package com.mycompany.myapp2;

import android.app.Activity;
import android.*;
import android.os.*;
import android.view.*;
import android.widget.*;
import android.widget.Button;
import android.widget.TextView;
import android.media.*;
import android.media.MediaPlayer;

public class MainActivity extends Activity { 
    //** called when the activity is first created 
    int counter;
    Button add,sub;
    TextView display;
    


    @Override


    public void onCreate(Bundle savedInstanceState) 


    { 
        super.onCreate (savedInstanceState);

        setContentView(R.layout.main); 
        counter = 0;
        add = (Button) findViewById(R.id.bAdd);
        sub = (Button) findViewById(R.id.bSub); 
        display = (TextView) findViewById(R.id.tvDisplay);
       it plays here?
    MediaPlayer mp3 = MediaPlayer.create(this, R.raw.son);
    mp3.start();
    
        add.setOnClickListener(new View.OnClickListener() {

                public void onClick(View v) {
                    
                    //ERROR BELLOW Wont excute here 
                    MediaPlayer mp3 = MediaPlayer.create(this, R.raw.son); 
                    
                    // Make the button do something 
                        
                    
                        
                    counter ++;
                    display.setText(" " + counter); 
                    
                    


                }



            });


        sub.setOnClickListener(new View.OnClickListener() {

                public void onClick(View v) {

                    // Take data away
                    counter --;
                    display.setText(" " + counter);


                }



            });





    }




} 


[Fou-Lu]

I haven't a clue about android development, but these do stand out here:

        display = (TextView) findViewById(R.id.tvDisplay);
       it plays here?
    MediaPlayer mp3 = MediaPlayer.create(this, R.raw.son);
    mp3.start();

// and here:
                    MediaPlayer mp3 = MediaPlayer.create(this, R.raw.son);

'this' has changed its scope. The first one's 'this' refers to the instance of Activity. The second's 'this' refers to the instance created by new View.OnClickListener. Perhaps that will be your issue?
If so, you can apply the outer's 'this' by creating a final variable and referring to it in the inner class:

PHP Code:

final Activity thisActivity = this;
//...
                    MediaPlayer mp3 = MediaPlayer.create(thisActivity, R.raw.son);