package com.sample.test02;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.Toast;
public class FirstB extends Activity{
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_CONTEXT_MENU);
setContentView(com.sample.test02.R.layout.first_layout);
Button butt=(Button)findViewById(com.sample.test02.R.id.button_1);
butt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(FirstB.this,"@+string/bt",Toast.LENGTH_SHORT).show();
}
});
}
报 butt.setOnClickListener(new View.OnClickListener() { 这一行空指针错误