我不知道为什么这段代码会抛出 nullPointerException。我没有编写这部分代码,我对这个员工很陌生。我尽力了,但找不到答案。
public class ProgramExamActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setTitle("Screen #1");
}
public void onClick(View v) {
switch(v.getId()) {
case R.id.btn2:
setContentView(R.layout.screen2);
setTitle("Screen #2");
break;
}
}