Question

我正在使用标签来执行项目。我收到以下错误。 android.support.v4.app.FragmentTransaction中的attach（android.support.v4.app.Fragment）无法应用于（com.outdeh.EventsFragment）。

package com.outdeh;


import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.content.Context;

import com.parse.Parse;
import com.parse.ParseAnalytics;
import com.parse.ParseObject;
import com.parse.PushService;


public class EventsFragment extends FragmentActivity {

    @Override
    public void onCreate(Bundle savedInstanceState){


        // Parse.initialize(this, "nSXPAwYG29VZMaCkasdjhakhsdkjsahdhj", "PWeiawu25r7sAmOYdgP0kajhsdkahaskjdhashj");

       // ParseObject testObject = new ParseObject("TestObject");
        //testObject.put("foo", "bar new");
        //testObject.saveInBackground();

    }

    public EventsFragment() {
        //Required empty public constructor
    }


    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        //Inflate the layout for this fragment
        return inflater.inflate(R.layout.event_fragment, container, false);
    }
}






package com.outdeh;

import com.outdeh.R;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.v4.app.FragmentActivity;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TabHost;
import android.support.v4.app.Fragment;

import com.parse.Parse;
import com.parse.ParseAnalytics;
import com.parse.PushService;
import com.parse.ParseInstallation;

public class MainActivity extends FragmentActivity {
    TabHost tHost;

    @Override
    public void onCreate(Bundle savedInstanceState) {

        //Push notifications
        Parse.initialize(this, "nSXPAwYG29VZMdfsddfsdfsdfdselz", "PWeiawu25r7sAmOYddfdsfsdfsdfssVkSJJEWU");
        PushService.setDefaultPushCallback(this, MainActivity.class);
        ParseAnalytics.trackAppOpened(getIntent());
        // Save the current Installation to Parse.
        ParseInstallation.getCurrentInstallation().saveInBackground();


        //Remove title bar
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);

        //Remove notification bar
        //this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tHost = (TabHost) findViewById(android.R.id.tabhost);
        tHost.setup();

        /** Defining Tab Change Listener event. This is invoked when tab is changed */
        TabHost.OnTabChangeListener tabChangeListener = new TabHost.OnTabChangeListener() {

            @Override
            public void onTabChanged(String tabId) {
                android.support.v4.app.FragmentManager fm =   getSupportFragmentManager();
                HomeFragment homeFragment = (HomeFragment) fm.findFragmentByTag("outdeh");
                EventsFragment eventsFragment = (EventsFragment) fm.findFragmentByTag("events");
                PicsFragment picsFragment = (PicsFragment) fm.findFragmentByTag("pics");
                NewsFragment newsFragment = (NewsFragment) fm.findFragmentByTag("news");
                android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();

                /** Detaches the homeFragment if exists */
                if(homeFragment!=null)
                    ft.detach(homeFragment);

                /** Detaches the eventsFragment if exists*/
                 if(eventsFragment!=null)
                 ft.detach(eventsFragment);

                /** Detaches the newsFragment if exists */
                if(newsFragment!=null)
                    ft.detach(newsFragment);

                /** Detaches the picsFragment if exists */
                if(picsFragment!=null)
                    ft.detach(picsFragment);


                /** If current tab is android */
                if(tabId.equalsIgnoreCase("outdeh")){

                    if(homeFragment==null){
                        /** Create homeFragment and adding to fragmenttransaction */
                        ft.add(R.id.realtabcontent,new HomeFragment(), "outdeh");
                    }else{
                        /** Bring to the front, if already exists in the fragmenttransaction */
                        ft.attach(homeFragment);
                    }

                }else if(tabId.equalsIgnoreCase("events")){

                    if(eventsFragment==null){
                        /** Create homeFragment and adding to fragmenttransaction */
                        ft.add(R.id.realtabcontent,new EventsFragment(), "events");
                    }else{
                        /** Bring to the front, if already exists in the fragmenttransaction */
                        ft.attach(eventsFragment);
                    }

                }else if(tabId.equalsIgnoreCase("news")){

                    if(newsFragment==null){
                        /** Create homeFragment and adding to fragmenttransaction */
                        ft.add(R.id.realtabcontent,new NewsFragment(), "news");
                    }else{
                        /** Bring to the front, if already exists in the fragmenttransaction */
                        ft.attach(newsFragment);
                    }

                }else if(tabId.equalsIgnoreCase("pics")){

                    if(picsFragment==null){
                        /** Create homeFragment and adding to fragmenttransaction */
                        ft.add(R.id.realtabcontent,new PicsFragment(), "pics");
                    }else{
                        /** Bring to the front, if already exists in the fragmenttransaction */
                        ft.attach(picsFragment);
                    }

                }
                ft.commit();
            }
        };


        /** Setting tabchangelistener for the tab */
        tHost.setOnTabChangedListener(tabChangeListener);

        /** Defining tab builder for Home tab */
        TabHost.TabSpec tSpecOutdeh = tHost.newTabSpec("outdeh");
        tSpecOutdeh.setIndicator("OutDeh",getResources().getDrawable(R.drawable.home));
        tSpecOutdeh.setContent(new DefinedTabContent(getBaseContext()));
        tHost.addTab(tSpecOutdeh);


        /** Defining tab builder for Events tab */
        TabHost.TabSpec tSpecEvents = tHost.newTabSpec("events");
        tSpecEvents.setIndicator("Upcoming Events",getResources().getDrawable(R.drawable.events));
        tSpecEvents.setContent(new DefinedTabContent(getBaseContext()));
        tHost.addTab(tSpecEvents);

        /** Defining tab builder for Pics tab */
        TabHost.TabSpec tSpecPics = tHost.newTabSpec("pics");
        tSpecPics.setIndicator("Recent Event Pictures",getResources().getDrawable(R.drawable.pics));
        tSpecPics.setContent(new DefinedTabContent(getBaseContext()));
        tHost.addTab(tSpecPics);

        /** Defining tab builder for News tab */
        TabHost.TabSpec tSpecNews = tHost.newTabSpec("news");
        tSpecNews.setIndicator("Entertainment News",getResources().getDrawable(R.drawable.news));
        tSpecNews.setContent(new DefinedTabContent(getBaseContext()));
        tHost.addTab(tSpecNews);

    }

}

//下一课

当我运行时，我收到以下错误。

inconvertible types
found   : android.support.v4.app.Fragment
required: com.outdeh.EventsFragment


detach(android.support.v4.app.Fragment) in android.support.v4.app.FragmentTransaction cannot be applied to (com.outdeh.EventsFragment)

cannot find symbol method add(int,com.outdeh.EventsFragment,java.lang.String)

attach(android.support.v4.app.Fragment) in android.support.v4.app.FragmentTransaction cannot be applied to (com.outdeh.EventsFragment)

Answer 1

这意味着您的EventsFragment需要实现FragmentTransaction：

考虑您的例外：attach(android.support.v4.app.Fragment) in android.support.v4.app.FragmentTransaction cannot be (com.outdeh.EventsFragment)

可能使用getFragmentManager()，更改为getSupportFragmentManager()

Answer 2

通常，当您未在所有片段中使用支持库时，会导致此类错误。

请注意，请检查并确保您对Fragment，FragmentManager和FragmentTransaction的所有引用仅来自支持库，而不是来自另一个。此外，您对FragmentManager的调用应使用getSupportFragmentManager（）。

这应解决问题。如果不是这种情况并且您使用的是正确的导入，请发布您的代码。

Parse的片段错误

2 个答案: