Mediaplayer Pausing And Playing Error

I'm building an application for Android with Java and XML. The user of the app must be able to listen to a tune and also pause it. So I made one button with which you can play and

Solution 1:

That because I think you have declared and instantiated mp on the onCreate method and it is not accessible in klikopplaybutton() method.

Try something like this.

publicclassLevel01vraag01extendsActivityimplementsOnClickListener {

    intplayknopvariable=0;
    MediaPlayer mp;

    @OverridepublicvoidonCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.vraaglayout);
        setupButtonClickListeners();
        mp = MediaPlayer.create(Level01vraag01.this, R.raw.mcdonalds);

    }

privatevoidsetupButtonClickListeners()
{
    ImageViewplaysoundButton= (ImageView) findViewById(R.id.playsoundbutton);
    playsoundButton.setOnClickListener(this);
}

UPDATE for ERRORS on your ImageView.

You are getting an error in your playsoundButton ImageView object because you again declared it and executed the findViewById in setupButtonClickListeners method and it is not acessible in klikopplaybutton method.

Try this one.

publicclassLevel01vraag01extendsActivityimplementsOnClickListener {

    int playknopvariable = 0;
    MediaPlayer mp;
    ImageView playsoundButton;

    @OverridepublicvoidonCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.vraaglayout);
        setupButtonClickListeners();
        mp = MediaPlayer.create(Level01vraag01.this, R.raw.mcdonalds);

    }

    privatevoidsetupButtonClickListeners(){
        playsoundButton = (ImageView) findViewById(R.id.playsoundbutton);
        playsoundButton.setOnClickListener(this);
    }

    privatevoidklikopplaybutton(){

        if (playknopvariable == 0){
           mp.start();
           playknopvariable = 1;
           playsoundButton.setImageResource(R.drawable.playsoundbutton);
       }else{
           mp.pause();
           playknopvariable = 0;
           playsoundButton.setImageResource(R.drawable.pause);
   }

   publicvoidonClick(View v) {

        switch(v.getId()){
        case R.id.playsoundbutton:
            klikopplaybutton();
        break;
   }

}