Java 未为MoviesFragment类型定义getsupportfragmentmanager

我正在创建一个android应用程序。在一个类中，我扩展了片段，并且在标题中得到了错误。代码如下：

    import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import ashat.jaiswal.trr.adapter.TabsPagerAdapter;

public class MoviesFragment extends Fragment implements ActionBar.TabListener{

    //public MoviesFragment(){}
    private ViewPager viewPager;
    private TabsPagerAdapter mAdapter;
    private ActionBar actionBar;

    private String[] tabs = { "InTheaters", "Upcoming", "Search" };


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

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

        viewPager = (ViewPager)rootView.findViewById(R.id.pager);
        actionBar = getActivity().getActionBar();
        mAdapter = new TabsPagerAdapter(getActivity().getSupportFragmentManager());

        viewPager.setAdapter(mAdapter);
        actionBar.setHomeButtonEnabled(false);
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);   

        for (String tab_name : tabs) {
            actionBar.addTab(actionBar.newTab().setText(tab_name)
                    .setTabListener(this));
        }

        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
                // on changing the page
                // make respected tab selected
                actionBar.setSelectedNavigationItem(position);
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
            }
        });


        return rootView;
    }

    @Override
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        // TODO Auto-generated method stub
        viewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }
}

问题是当我扩展片段活动时，它试图删除重写符号onCreate方法。如果没有这些，我就会犯这个错误。有人能告诉我一些解决办法吗

以下是完整的日志：

06-11 00:23:57.196: E/AndroidRuntime(20226): FATAL EXCEPTION: main
06-11 00:23:57.196: E/AndroidRuntime(20226): java.lang.RuntimeException: Unable to start activity ComponentInfo{ashat.jaiswal.trr/ashat.jaiswal.trr.MainActivity}: java.lang.ClassCastException: ashat.jaiswal.trr.MainActivity cannot be cast to android.support.v4.app.FragmentActivity
06-11 00:23:57.196: E/AndroidRuntime(20226):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2306)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2358)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at android.app.ActivityThread.access$600(ActivityThread.java:156)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1340)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at android.os.Looper.loop(Looper.java:153)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at android.app.ActivityThread.main(ActivityThread.java:5297)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at java.lang.reflect.Method.invokeNative(Native Method)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at java.lang.reflect.Method.invoke(Method.java:511)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at dalvik.system.NativeStart.main(Native Method)
06-11 00:23:57.196: E/AndroidRuntime(20226): Caused by: java.lang.ClassCastException: ashat.jaiswal.trr.MainActivity cannot be cast to android.support.v4.app.FragmentActivity
06-11 00:23:57.196: E/AndroidRuntime(20226):    at ashat.jaiswal.trr.MoviesFragment.onAttach(MoviesFragment.java:28)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:844)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1057)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at android.app.BackStackRecord.run(BackStackRecord.java:694)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1435)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at android.app.Activity.performStart(Activity.java:5131)
06-11 00:23:57.196: E/AndroidRuntime(20226):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2279)
06-11 00:23:57.196: E/AndroidRuntime(20226):    ... 11 more
06-11 00:23:57.280: E/AppErrorDialog(498): Failed to get ILowStorageHandle instance

MainActivity.java

---

您的问题是，您试图将支持库与非支持库混合使用，这会导致ClassCastException。在本例中，当您可能需要android.app.Fragment时，您正在使用android.support.v4.app.Fragment。在MoviesFragment中，在导入语句中更改以下内容

import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.FragmentTransaction;
import android.os.Bundle;
//import android.support.v4.app.Fragment;
import android.app.Fragment;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import ashat.jaiswal.trr.adapter.TabsPagerAdapter;

---

但是，如果您计划将目标锁定在低于11的API版本，那么您有很多代码需要重新编写。在这种情况下，您需要使用FragmentActivity而不是Activity。

发布您的MainActivity@Rod_Algonquin请参阅更新主活动的租金必须是FragmentActivity，而不仅仅是Activity我可以将其更改为FragmentActivity吗。？即使在那之后它也不工作。@Akshat用扩展的碎片活动重新发布你的主要活动它不工作。我试过了。你能帮忙吗。？这里是完整代码的链接。

import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.FragmentTransaction;
import android.os.Bundle;
//import android.support.v4.app.Fragment;
import android.app.Fragment;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import ashat.jaiswal.trr.adapter.TabsPagerAdapter;