Button+Spinner [android]

I used a spinner and a button inside a tab of my application

but, when I assigned a onClicklistner for my button

the application crashes.

i used

myspinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView adapter, View v, 
         int i,longlng) {
    }
});

for my spinner and

 btn.setOnClickListener(new OnClickListener() {
    @Override
    public void o开发者_高级运维nClick(View v) {
        //do some work
    }
});

for my Button. the application works fine once I use only on listner!!!!

please help,thanx

try this

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);

value.setOnItemSelectedListener(this);
}

    @Override
    public void onItemSelected(AdapterView<?> parentview, View V, int pos,
            long arg3) {
                                  }

I think you are initialized the any view on activity ,firstly initialized the all component which you are using in xml

use this line for button in activity

mButton=(Button)findViewById(R.id.button);

then it would be work.