Fixed!
I took out the listeners, and in the XML file I just added android:onClick="playSound"
for each button and created ten methods to handle the ten different sounds!
Thanks for helping me anyways!
質問
I am making a soundboard app and I keep running into problems when I try to add a listener to the buttons.
This is my code that I am using to create the buttons, MediaPlayers, and adding listeners. Log cat says there is a null pointer exception at the line where I do one.setOnclickListener(this);
Code:
public class MainActivity extends Activity implements View.OnClickListener{
Button one;
Button two;
Button three;
Button four;
Button five;
Button six;
Button seven;
Button eight;
Button nine;
Button ten;
MediaPlayer hello;
MediaPlayer gatorade;
MediaPlayer haveatit;
MediaPlayer miserable;
MediaPlayer mother;
MediaPlayer stop;
MediaPlayer whatup;
MediaPlayer money;
MediaPlayer yeah;
MediaPlayer science;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
one = (Button) this.findViewById(R.id.one);
two = (Button) this.findViewById(R.id.two);
three = (Button) this.findViewById(R.id.three);
four = (Button) this.findViewById(R.id.four);
five = (Button) this.findViewById(R.id.five);
six = (Button) this.findViewById(R.id.six);
seven = (Button) this.findViewById(R.id.seven);
eight = (Button) this.findViewById(R.id.eight);
nine = (Button) this.findViewById(R.id.nine);
ten = (Button) this.findViewById(R.id.ten);
hello = MediaPlayer.create(this, R.raw.hello);
gatorade = MediaPlayer.create(this, R.raw.gatorade);
haveatit = MediaPlayer.create(this, R.raw.haveatit);
miserable = MediaPlayer.create(this, R.raw.miserable);
mother = MediaPlayer.create(this, R.raw.motherofgod);
stop = MediaPlayer.create(this, R.raw.stopwhining);
whatup = MediaPlayer.create(this, R.raw.whatup);
money = MediaPlayer.create(this, R.raw.wheresmymoney);
yeah = MediaPlayer.create(this, R.raw.yeah);
science = MediaPlayer.create(this, R.raw.yeahscience);
one.setOnClickListener(this);
two.setOnClickListener(this);
three.setOnClickListener(this);
four.setOnClickListener(this);
five.setOnClickListener(this);
six.setOnClickListener(this);
seven.setOnClickListener(this);
eight.setOnClickListener(this);
nine.setOnClickListener(this);
}
Any Idea why I am getting a null pointer exception on start up?
Stack Trace: Couldn't add it as code http://imgur.com/dwrYOV9
解決
Fixed!
I took out the listeners, and in the XML file I just added android:onClick="playSound"
for each button and created ten methods to handle the ten different sounds!
Thanks for helping me anyways!