YouTubePlayerFragment无法转换为android.support.v4.app.Fragment

概述我已经坚持了3天了,经过大量搜索后尝试了我遇到的一切,这篇文章真的是最后的手段,我试图用导航抽屉打开一个YouTubePlayerFragment YouTubePlayerFragment无法转换为android.support.v4.app.Fragment是问题所在 编辑问题：我已经更新了代码,因为我使用了YouTubePlayerSupportFragment而不是YouTubePlaye 我已经坚持了3天了,经过大量搜索后尝试了我遇到的一切,这篇文章真的是最后的手段,我试图用导航抽屉打开一个YouTubePlayerFragment

YouTubePlayerFragment无法转换为android.support.v4.app.Fragment是问题所在

编辑问题：我已经更新了代码,因为我使用了YouTubePlayerSupportFragment而不是YouTubePlayerFragment,我在主要活动中的displayVIEw方法中遇到错误(案例4：fragment = new Youtube(); break;)说无法从Youtube转换为片段,我无法得到一个logcat,因为我甚至无法运行它

编辑问题2：代码再次更新,但现在我有运行时问题,继承logcat

07-22 22:15:09.782: E/AndroIDRuntime(20603): FATAL EXCEPTION: main07-22 22:15:09.782: E/AndroIDRuntime(20603): Process: net.frankanDWalters,PID: 2060307-22 22:15:09.782: E/AndroIDRuntime(20603): java.lang.NullPointerException: Attempt to invoke virtual method 'voID com.Google.androID.youtube.player.YouTubePlayerVIEw.a()' on a null object reference07-22 22:15:09.782: E/AndroIDRuntime(20603):    at com.Google.androID.youtube.player.YouTubePlayerSupportFragment.onStart(UnkNown Source)07-22 22:15:09.782: E/AndroIDRuntime(20603):    at androID.support.v4.app.Fragment.performStart(Fragment.java:1502)07-22 22:15:09.782: E/AndroIDRuntime(20603):    at androID.support.v4.app.FragmentManagerImpl.movetoState(FragmentManager.java:957)07-22 22:15:09.782: E/AndroIDRuntime(20603):    at androID.support.v4.app.FragmentManagerImpl.movetoState(FragmentManager.java:1104)07-22 22:15:09.782: E/AndroIDRuntime(20603):    at androID.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)07-22 22:15:09.782: E/AndroIDRuntime(20603):    at androID.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)07-22 22:15:09.782: E/AndroIDRuntime(20603):    at androID.support.v4.app.FragmentManagerImpl.run(FragmentManager.java:440)07-22 22:15:09.782: E/AndroIDRuntime(20603):    at androID.os.Handler.handleCallback(Handler.java:739)07-22 22:15:09.782: E/AndroIDRuntime(20603):    at androID.os.Handler.dispatchMessage(Handler.java:95)07-22 22:15:09.782: E/AndroIDRuntime(20603):    at androID.os.Looper.loop(Looper.java:135)07-22 22:15:09.782: E/AndroIDRuntime(20603):    at androID.app.ActivityThread.main(ActivityThread.java:5351)07-22 22:15:09.782: E/AndroIDRuntime(20603):    at java.lang.reflect.Method.invoke(Native Method)07-22 22:15:09.782: E/AndroIDRuntime(20603):    at java.lang.reflect.Method.invoke(Method.java:372)07-22 22:15:09.782: E/AndroIDRuntime(20603):    at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)07-22 22:15:09.782: E/AndroIDRuntime(20603):    at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:703)

继承了java代码,希望有人能帮忙,谢谢

import androID.app.Activity;import androID.os.Bundle;import androID.vIEw.LayoutInflater;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import androID.Widget.Toast;import com.Google.androID.youtube.player.YouTubeInitializationResult;import com.Google.androID.youtube.player.YouTubePlayer;import com.Google.androID.youtube.player.YouTubePlayerSupportFragment;public class Youtube extends YouTubePlayerSupportFragment implements YouTubePlayer.OnInitializedListener {    public static Youtube newInstance() {        Youtube fragment = new Youtube();        return fragment;    }    private voID init(){        initialize("AIzaSyBybxmsBPvhMKgM4RKqpneb4Tf4yObVAkY",this);    }    public Youtube() {    }    @OverrIDe    public voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);    }    public VIEw onCreateVIEw(LayoutInflater inflater,VIEwGroup container,Bundle savedInstanceState) {        VIEw vIEw = inflater.inflate(R.layout.youtubefragment,container,false);        Youtube ytf = newInstance();        ytf.init();        getActivity().getSupportFragmentManager().beginTransaction()                .add(R.ID.youtube_player,ytf)                .commit();        return vIEw;    }    @OverrIDe    public voID onAttach(Activity activity) {        super.onAttach(activity);    }    @OverrIDe    public voID onDetach() {        super.onDetach();    }    @OverrIDe    public voID onInitializationSuccess(YouTubePlayer.ProvIDer provIDer,YouTubePlayer player,boolean wasRestored) {        if (!wasRestored) {            player.cueVIDeo("nCgQDjiotG0");        }    }    @OverrIDe    public voID onInitializationFailure(YouTubePlayer.ProvIDer provIDer,YouTubeInitializationResult youTubeInitializationResult) {        Toast.makeText(getActivity(),"Failured to Initialize!",Toast.LENGTH_LONG).show();    }}

这是xml代码

<?xml version="1.0" enCoding="utf-8"?><linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent"    androID:orIEntation="vertical"     androID:background="@drawable/background"    androID:ID="@+ID/fragment_youtube_player_holder" ><fragment  androID:name="com.Google.androID.youtube.player.YouTubePlayerSupportFragment"  androID:ID="@+ID/youtube_player"  androID:layout_wIDth="match_parent"  androID:layout_height="match_parent"/></linearLayout>

这是包含导航抽屉的主要活动

import java.util.ArrayList;import net.frankanDWalters.adapter.NavDrawerlistadapter;import net.frankanDWalters.model.NavDrawerItem;import androID.support.v4.app.Fragment;import androID.content.res.Configuration;import androID.content.res.TypedArray;import androID.os.Bundle;import androID.support.v4.app.ActionbarDrawerToggle;import androID.support.v4.app.FragmentActivity;import androID.support.v4.Widget.DrawerLayout;import androID.util.Log;import androID.vIEw.Menu;import androID.vIEw.MenuItem;import androID.vIEw.VIEw;import androID.Widget.AdapterVIEw;import androID.Widget.ListVIEw;public class MainActivity extends FragmentActivity {    private DrawerLayout mDrawerLayout;    private ListVIEw mDrawerList;    private ActionbarDrawerToggle mDrawerToggle;    // nav drawer Title    //private CharSequence mDrawerTitle;    // used to store app Title    //private CharSequence mTitle;    // slIDe menu items    private String[] navMenuTitles;    private TypedArray navMenuIcons;    private ArrayList<NavDrawerItem> navDrawerItems;    private NavDrawerlistadapter adapter;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);        //mTitle = mDrawerTitle = getTitle();        // load slIDe menu items        navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);        // nav drawer icons from resources        navMenuIcons = getResources()                .obtainTypedArray(R.array.nav_drawer_icons);        mDrawerLayout = (DrawerLayout) findVIEwByID(R.ID.drawer_layout);        mDrawerList = (ListVIEw) findVIEwByID(R.ID.List_slIDermenu);        navDrawerItems = new ArrayList<NavDrawerItem>();        // adding nav drawer items to array        // Home        navDrawerItems.add(new NavDrawerItem(navMenuTitles[0],navMenuIcons.getResourceID(0,-1)));        // Find People        navDrawerItems.add(new NavDrawerItem(navMenuTitles[1],navMenuIcons.getResourceID(1,-1)));        // Photos        navDrawerItems.add(new NavDrawerItem(navMenuTitles[2],navMenuIcons.getResourceID(2,-1)));        // CommunitIEs,Will add a counter here        navDrawerItems.add(new NavDrawerItem(navMenuTitles[3],navMenuIcons.getResourceID(3,-1)));        // Pages        navDrawerItems.add(new NavDrawerItem(navMenuTitles[4],navMenuIcons.getResourceID(4,-1)));        // What's hot,We  will add a counter here        navDrawerItems.add(new NavDrawerItem(navMenuTitles[5],navMenuIcons.getResourceID(5,-1)));        navDrawerItems.add(new NavDrawerItem(navMenuTitles[6],navMenuIcons.getResourceID(6,-1)));        navDrawerItems.add(new NavDrawerItem(navMenuTitles[7],navMenuIcons.getResourceID(7,-1)));        navDrawerItems.add(new NavDrawerItem(navMenuTitles[8],navMenuIcons.getResourceID(8,-1)));        navDrawerItems.add(new NavDrawerItem(navMenuTitles[9],navMenuIcons.getResourceID(9,-1)));        navDrawerItems.add(new NavDrawerItem(navMenuTitles[10] + " disc 3",navMenuIcons.getResourceID(10,-1)));        // Recycle the typed array        navMenuIcons.recycle();        mDrawerList.setonItemClickListener(new SlIDeMenuClickListener());        // setting the nav drawer List adapter        adapter = new NavDrawerlistadapter(getApplicationContext(),navDrawerItems);        mDrawerList.setAdapter(adapter);        // enabling action bar app icon and behaving it as toggle button        getActionbar().setdisplayHomeAsUpEnabled(true);        getActionbar().setHomebuttonEnabled(true);        mDrawerToggle = new ActionbarDrawerToggle(this,mDrawerLayout,R.drawable.ic_drawer,//nav menu toggle icon                R.string.app_name,// nav drawer open - description for accessibility                R.string.app_name // nav drawer close - description for accessibility        ) {            public voID onDrawerClosed(VIEw vIEw) {                //getActionbar().setTitle(mTitle);                // calling onPrepareOptionsMenu() to show action bar icons                invalIDateOptionsMenu();            }            public voID onDrawerOpened(VIEw drawerVIEw) {                //getActionbar().setTitle(mDrawerTitle);                // calling onPrepareOptionsMenu() to hIDe action bar icons                invalIDateOptionsMenu();            }        };        mDrawerLayout.setDrawerListener(mDrawerToggle);        if (savedInstanceState == null) {            // on first time display vIEw for first nav item            displayVIEw(0);        }    }    /**     * SlIDe menu item click Listener     * */    private class SlIDeMenuClickListener implements            ListVIEw.OnItemClickListener {        @OverrIDe        public voID onItemClick(AdapterVIEw<?> parent,VIEw vIEw,int position,long ID) {            // display vIEw for selected nav drawer item            displayVIEw(position);        }    }    @OverrIDe    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.main,menu);        return true;    }    @OverrIDe    public boolean onoptionsItemSelected(MenuItem item) {        // toggle nav drawer on selecting action bar app icon/Title        if (mDrawerToggle.onoptionsItemSelected(item)) {            return true;        }        // Handle action bar actions click        switch (item.getItemID()) {        case R.ID.action_settings:            return true;        default:            return super.onoptionsItemSelected(item);        }    }    /* *     * Called when invalIDateOptionsMenu() is triggered     */    @OverrIDe    public boolean onPrepareOptionsMenu(Menu menu) {        // if nav drawer is opened,hIDe the action items        boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);        menu.findItem(R.ID.action_settings).setVisible(drawerOpen && !drawerOpen);        return super.onPrepareOptionsMenu(menu);    }    /**     * Diplaying fragment vIEw for selected nav drawer List item     * */    private voID displayVIEw(int position) {        // update the main content by replacing fragments        Fragment fragment = null;        switch (position) {//      case 0://          fragment = new Home();//          break;//      case 1://          fragment = new Forum();//          break;//      case 2://          fragment = new Facebook();//          break;//      case 3://          fragment = new Twitter();//          break;        case 4:            //fragment  = Youtube.newInstance();//          if(YouTubeIntents.isYouTubeInstalled(getBaseContext()) ) {//                 if(YouTubeAPIServiceUtil.isYouTubeAPIServiceAvailable(getBaseContext()) != YouTubeInitializationResult.SUCCESS) {//                    // fragment = new Youtube();//                     Intent intent = YouTubeIntents.createuserIntent(this,"FrankanDWalters");//                      startActivity(intent);//                     //               } else  {                       fragment = new Youtube();                     //Intent intent = YouTubeIntents.createuserIntent(this,"FrankanDWalters");                       // startActivity(intent);//               }//              }            break;//      case 5://          fragment = new Instagram();//          break;//      case 6://          fragment = new Google();//          break;//      case 7://          fragment = new Gigography();//          break;//      case 8://          fragment = new discography();//          break;//      case 9://          fragment = new Lyrics();//          break;//      case 10://          fragment = new Souvenirs();//          break;        default:            break;        }        if (fragment != null) {            getSupportFragmentManager().beginTransaction()                    .replace(R.ID.frame_container,fragment).commit();            // update selected item and Title,then close the drawer            mDrawerList.setItemChecked(position,true);            mDrawerList.setSelection(position);            //setTitle(navMenuTitles[position]);            mDrawerLayout.closeDrawer(mDrawerList);        } else {            // error in creating fragment            Log.e("MainActivity","Error in creating fragment");        }    }//  @OverrIDe//  public voID setTitle(CharSequence Title) {//      mTitle = Title;//      getActionbar().setTitle("The Frank And Walters");//  }    /**     * When using the ActionbarDrawerToggle,you must call it during     * onPostCreate() and onConfigurationChanged()...     */    @OverrIDe    protected voID onPostCreate(Bundle savedInstanceState) {        super.onPostCreate(savedInstanceState);        // Sync the toggle state after onRestoreInstanceState has occurred.        mDrawerToggle.syncState();    }    @OverrIDe    public voID onConfigurationChanged(Configuration newConfig) {        super.onConfigurationChanged(newConfig);        // Pass any configuration change to the drawer toggls        mDrawerToggle.onConfigurationChanged(newConfig);    }}

解决方法 将YouTubePlayerFragment替换为 YouTubePlayerSupportFragment,因为这是使用Fragment支持版本的版本. 总结

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