java - fragment 访问另一个 Java 方法

Question

我的 fragment 注意正在访问 fragment 待办事项列表的删除方法，而不是执行其自己的代码行。我怎样才能纠正它？其余方法工作正常。

哪里出了问题？

fragment中删除代码注:

@Override
 public boolean onContextItemSelected(MenuItem item) {
    AdapterView.AdapterContextMenuInfo info =   (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
    int listpos = info.position;
    String io = list1.getItemAtPosition(listpos).toString();
    StringTokenizer s=new StringTokenizer(io);
    if (item.getTitle()=="Delete") {
        ArrayList<String> all = new ArrayList<String>();
        while (s.hasMoreTokens()) {
            all.add(s.nextToken());
        }
        Toast.makeText(getContext(), all.get(0).toString(), Toast.LENGTH_SHORT).show();
        String query = "delete from notes where heading = '"+all.get(0).toString()+"';";
        database.execSQL(query);
        //database.close();
        Intent n = new Intent(getContext(), MainActivity.class);
startActivity(n);

}

fragment To-doList代码:

 @Override
public boolean onContextItemSelected(MenuItem item) {
    AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
    int listpos = info.position;
    String io = list.getItemAtPosition(listpos).toString();
    StringTokenizer s=new StringTokenizer(io);
    if (item.getTitle()=="Delete") {
        ArrayList<String> al = new ArrayList<String>();
        while (s.hasMoreTokens()) {
            al.add(s.nextToken());

            Toast.makeText(getContext(), al.get(0).toString(), Toast.LENGTH_SHORT).show();

            String query1 = "delete from todolist where elist = '" + al.get(0).toString() + "';";
            database.execSQL(query1)

            Intent n = new Intent(getContext(), MainActivity.class);
            startActivity(n);

        }

Answer 1

使用.equals()方法来比较字符串。因此，您的 if 条件变得 false。所以替换

item.getTitle()=="Delete"

与

"Delete".equals(item.getTitle());