Question

我是Android的新手，我一直在尝试这段代码但是我收到以下错误：错误：（20,8）错误：SyllabusFragment不是抽象的，并且不会覆盖onCreateInteractionListener中的抽象方法createAssignmentClicked（Assignment）

我无法理解我的代码有什么问题任何帮助将不胜感激

SyllabusFragment：

import android.support.v4.app.Fragment;
import android.app.AlarmManager;
import android.app.DialogFragment;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import java.util.Calendar;


public class SyllabusFragment  extends Fragment
    implements ColorDialogFragment.onCreateInteractionListener,
    CreateAssignmentDialogFragment.onCreateInteractionListener,
    classFragment.assignmentCall,
    EditClassDialogFragment.onEditListener,
    EditAssignmentDialogFragment.onEditListener,
    EditColorDialogFragment.onCreateInteractionListener{

private String currentClass;
/*  Function returns the current parent class of activities being displayed. To only be called
 *  when a assignment fragment is being displayed.*/
public String getParentClass() {
    return currentClass;
}

/* Definition variables, indicating a certain fragment. */
private static final int CLASS_LIST_VIEW = 0;
private static final int ASSIGNMENT_LIST_VIEW = 1;

/* Variable, that is changed depending on which fragment is being displayed. */
private int currentFragment;
/*  A function which receives no arguments. Returns an integer value, indicating which fragment
 *  is being displayed within the activity. */
public int getCurrentFragment() {
    return currentFragment;
}

/*  A function that is called when a new fragment is being displayed, which sets the title of
 *  the activity, as well as sets the currentFragment variable to its proper value. */
public void setCurrentFragment(int fragment) {
    switch (fragment) {
        case CLASS_LIST_VIEW:
            currentFragment = fragment;
            //setTitle("Simple Planner");
            break;
        case ASSIGNMENT_LIST_VIEW:
            currentFragment = fragment;
            /*  Setting activity title to the parent class of the assignments being displayed. */
           // setTitle(getParentClass());
            break;
    }
}

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_syllabus, container, false);

    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
    //if (!prefs.getBoolean("firstTime", false)) {
    // <---- run your one time code here();
    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR_OF_DAY, prefs.getInt("hour", 19));
    calendar.set(Calendar.MINUTE, prefs.getInt("minute", 30));
    calendar.set(Calendar.SECOND, 0);
    Intent intent1 = new Intent(getActivity(), AlaramReceiver.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(getActivity(), 0,intent1, PendingIntent.FLAG_UPDATE_CURRENT);
    AlarmManager am = (AlarmManager) SyllabusFragment.this.getActivity().getSystemService(getActivity().ALARM_SERVICE);
    am.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
            1000 * 60 * 60 * 24, pendingIntent);
    //}

    FloatingActionButton floatingActionButton = (FloatingActionButton)rootView.findViewById(R.id.fab);

     /* Creating listener for Floating Action Button. */
    floatingActionButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            /* Action for when Floating Action Button is clicked. */
            switch (getCurrentFragment()) {
                case CLASS_LIST_VIEW: {
                    DialogFragment dialogFragment = new CreateClassDialogFragment();
                    dialogFragment.show(getActivity().getFragmentManager(), "dialog");
                    break;
                }
                case ASSIGNMENT_LIST_VIEW: {
                    DialogFragment dialogFragment = new CreateAssignmentDialogFragment();
                    Bundle args = new Bundle();
                    args.putString("parent_class", getParentClass());
                    dialogFragment.setArguments(args);
                    dialogFragment.show(getActivity().getFragmentManager(), "dialog");
                    break;
                }
                default:
                    break;
            }
        }
    });
     /* Creating initial fragment, containing the list view for all of the classes registered. */
    FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
    transaction.add(R.id.fragment, classFragment.newInstance());
    transaction.addToBackStack(null);
    transaction.commit();
    setCurrentFragment(CLASS_LIST_VIEW);

    return rootView;
}

@Override
public void assignmentCallMethod(String pClass) {
    /* A class was clicked. Changing the fragment to the assignment fragment. */
    currentClass = pClass;
    FragmentTransaction transaction =getActivity().getSupportFragmentManager().beginTransaction();
    transaction.setCustomAnimations(R.anim.enter, R.anim.exit, R.anim.pop_enter, R.anim.pop_exit);
    transaction.replace(R.id.fragment, assignmentsFragment.newInstance(pClass));
    transaction.addToBackStack(null);
    transaction.commit();
    setCurrentFragment(ASSIGNMENT_LIST_VIEW);
}

/* Function that is called from the create class fragment. */
@Override
public void createClicked() {
    /* A new class was created. Recreating the class view fragment. */
    FragmentTransaction transaction =getActivity().getSupportFragmentManager().beginTransaction();
    transaction.setCustomAnimations(R.anim.pop_enter, R.anim.pop_exit, R.anim.enter, R.anim.exit);
    transaction.replace(R.id.fragment, classFragment.newInstance());
    transaction.addToBackStack(null);
    transaction.commit();
}
@Override
public void editClassMethod() {
    /* A new class was edited. Recreating the class view fragment. */
    FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
    transaction.setCustomAnimations(R.anim.pop_enter, R.anim.pop_exit, R.anim.enter, R.anim.exit);
    transaction.replace(R.id.fragment, classFragment.newInstance());
    transaction.addToBackStack(null);
    transaction.commit();
}



@Override
public void editAssignmentMethod(int c) {
    switch (c) {
        case 0:
            FragmentTransaction transaction =getActivity().getSupportFragmentManager().beginTransaction();
            transaction.setCustomAnimations(R.anim.enter, R.anim.exit, R.anim.pop_enter, R.anim.pop_exit);
            transaction.replace(R.id.fragment, assignmentsFragment.newInstance(getParentClass()));
            transaction.addToBackStack(null);
            transaction.commit();
            break;
        case 1:
    }
}
 //   @Override
public void onBackPressed() {
    FragmentTransaction transaction;
    switch (getCurrentFragment()) {
        /* If viewing the class view, close the app. */
        case CLASS_LIST_VIEW:
            getActivity().finish();
            return;
        /* If viewing an assignment, return to the class view. */
        case ASSIGNMENT_LIST_VIEW:
            transaction = getActivity().getSupportFragmentManager().beginTransaction();
            transaction.setCustomAnimations(R.anim.pop_enter, R.anim.pop_exit, R.anim.enter, R.anim.exit);
            transaction.replace(R.id.fragment, classFragment.newInstance());
            transaction.addToBackStack(null);
            transaction.commit();
            setCurrentFragment(CLASS_LIST_VIEW);
            break;
    }
}

}

Answer 1

这意味着您正在实现界面 CreateAssignmentDialogFragment ，但您没有从此界面覆盖 onCreateInteractionListener（Assingment）方法，以便使用您必须使用的界面覆盖该方法。

Answer 2

错误意味着如果你的片段实现ColorDialogFragment.onCreateInteractionListener，它必须实现createAssignmentClicked（赋值）。

Android错误：（20,8）错误：片段不是抽象的，不会覆盖抽象方法

2 个答案: