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当我将OnFocusChangeListener设置为editText时,我的应用程序保持崩溃状态..应用程序崩溃并且我logcat发送给我java.lang.nullPointerException ..为什么?Android应用程序崩溃时,将setOnFocusChangeListener设置为EditText
public class MainActivity extends FragmentActivity
implements HeadlinesFragment.OnHeadlineSelectedListener {
private int myYear, myMonth, myDay;
static final int ID_DATEPICKER = 0;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.news_articles);
EditText txt1 = (EditText) findViewById(R.id.editText2);
txt1.setOnFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
final Calendar c = Calendar.getInstance();
myYear = c.get(Calendar.YEAR);
myMonth = c.get(Calendar.MONTH);
myDay = c.get(Calendar.DAY_OF_MONTH);
showDialog(ID_DATEPICKER);
}
});
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