如果我在 postexecute 上不评论语句 else if (message.equals("holiday")) 我的代码会崩溃 告诉我为什么如果不是 euqal 这条线 (message.equals("holiday")) 为什么不打印“学校”今天休息。原因：如果我评论 else if (message.equals("holiday")) 这个代码应用程序工作正常请检查我的 if else 语句
String message;
public class getDataTask extends AsyncTask<Void, Void, Void> {
getDataTask() {
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
yourBoolean=false;
}
@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
displayData();
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
yourBoolean=true ;
if ((Category_ID.size() > 0) ) {
listCategory.setAdapter(cla);
cla.notifyDataSetChanged() ;
listCategory.invalidateViews();
menu_nametxt.setText(mVal2);
}
else if (message.equals("holiday"))
{
menu_nametxt.setText("No menu available .");
listCategory.setVisibility(View.GONE);
}
else
menu_nametxt.setText("School is off today. Reason: "+mVal3);
listCategory.setVisibility(View.GONE);
}
private void displayData() {
Cursor mCursor3 = db.selectQuery("SELECT * FROM uss_vacation WHERE calendar_id);
if (mCursor3.moveToFirst()) {
do {
Vacation_Date.add(mCursor3.getString(mCursor3.getColumnIndex("date")));
if(mCursor3.getString(mCursor3.getColumnIndex("date")).equals(mydate))
{
message = "holiday";
String mVal ;
mVal = (mCursor3.getString(mCursor3.getColumnIndex("title")));
mVal2 = mVal.toString();
mCursor3.close();
return;
}
} while (mCursor3.moveToNext());
}
mCursor3.close();
}
if i comment this code application print "School is off today. Reason: text
else if (message.equals("holiday"))
// {
// menu_nametxt.setText("No menu available .");
// listCategory.setVisibility(View.GONE);
// }