我现在坚持了3天并尝试了大量搜索后遇到的所有内容，这篇文章真的是最后的手段，我试图使用导航抽屉打开YouTubePlayerFragment
YouTubePlayerFragment无法转换为android.support.v4.app.Fragment是问题
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displayView方法中遇到错误（案例4：fragment = new Youtube（）; break;）在主要活动中说无法转换从Youtube到片段，我无法获得logcat，因为我甚至无法运行它
编辑问题2：代码再次更新，但现在我遇到了运行时问题，继承了logcat
07-22 22:15:09.782: E/AndroidRuntime(20603): FATAL EXCEPTION: main
07-22 22:15:09.782: E/AndroidRuntime(20603): Process: net.frankandwalters, PID: 20603
07-22 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 reference
07-22 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$1.run(FragmentManager.java:440)
07-22 22:15:09.782: E/AndroidRuntime(20603): at android.os.Handler.handleCallback(Handler.java:739)
07-22 22:15:09.782: E/AndroidRuntime(20603): at android.os.Handler.dispatchMessage(Handler.java:95)
07-22 22:15:09.782: E/AndroidRuntime(20603): at android.os.Looper.loop(Looper.java:135)
07-22 22:15:09.782: E/AndroidRuntime(20603): at android.app.ActivityThread.main(ActivityThread.java:5351)
07-22 22:15:09.782: E/AndroidRuntime(20603): at java.lang.reflect.Method.invoke(Native Method)
07-22 22:15:09.782: E/AndroidRuntime(20603): at java.lang.reflect.Method.invoke(Method.java:372)
07-22 22:15:09.782: E/AndroidRuntime(20603): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)
07-22 22:15:09.782: E/AndroidRuntime(20603): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)
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);
}
}
答案 0 :(得分：9)
将YouTubePlayerFragment替换为YouTubePlayerSupportFragment，因为这是使用支持版Fragment的版本。
答案 1 :(得分：1)
尝试
import com.google.android.youtube.player.YouTubePlayerSupportFragment
而不是
import com.google.android.youtube.player.YouTubePlayerFragment;
在Youtube课程上。