我想在我的项目中制作YoutubeThumbnail视图...我正在使用列表视图查看我的YouTube视频列表..但是我收到错误，因为3天我用谷歌搜索但没有找到。当我点击activity_main.xml中的按钮时，它应该打开test.xml片段..我的所有视频列表都位于..应用程序崩溃..我已经给了下面的logcat ..请帮帮我我这样做是为了约3天:(
主要Activity.java
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = (Button) findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
android.app.FragmentManager fm = getFragmentManager();
fm.beginTransaction().add(R.id.content_frame, new test()).commit();
}
});
}
test.java
public class test extends Fragment {
View rootview;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootview = inflater.inflate(R.layout.test,container,false);
return rootview;
}
}
VideoListAdapter.java
public class VideoListAdapter extends BaseAdapter implements YouTubeThumbnailView.OnInitializedListener {
private Context mContext;
private Map<View, YouTubeThumbnailLoader> mLoaders;
public VideoListAdapter(final Context context) {
mContext = context;
mLoaders = new HashMap<>();
}
@Override
public int getCount() {
return YouTubeContent.ITEMS.size();
}
@Override
public Object getItem(int position) {
return YouTubeContent.ITEMS.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
VideoHolder holder;
//The item at the current position
final YouTubeContent.YouTubeVideo item = YouTubeContent.ITEMS.get(position);
if (convertView == null) {
//Create the row
final LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row_layout, parent, false);
//Create the video holder
holder = new VideoHolder();
//Set the title
holder.title = (TextView) convertView.findViewById(R.id.textView_title);
holder.title.setText(item.title);
//Initialise the thumbnail
holder.thumb = (YouTubeThumbnailView) convertView.findViewById(R.id.imageView_thumbnail);
holder.thumb.setTag(item.id);
holder.thumb.initialize(mContext.getString(R.string.DEVELOPER_KEY), this);
convertView.setTag(holder);
} else {
//Create it again
holder = (VideoHolder) convertView.getTag();
final YouTubeThumbnailLoader loader = mLoaders.get(holder.thumb);
if (item != null) {
//Set the title
holder.title.setText(item.title);
//Setting the video id can take a while to actually change the image
//in the meantime the old image is shown.
//Removing the image will cause the background color to show instead, not ideal
//but preferable to flickering images.
holder.thumb.setImageBitmap(null);
if (loader == null) {
//Loader is currently initialising
holder.thumb.setTag(item.id);
} else {
//The loader is already initialised
//Note that it's possible to get a DeadObjectException here
try {
loader.setVideo(item.id);
} catch (IllegalStateException exception) {
//If the Loader has been released then remove it from the map and re-init
mLoaders.remove(holder.thumb);
holder.thumb.initialize(mContext.getString(R.string.DEVELOPER_KEY), this);
}
}
}
}
return convertView;
}
@Override
public void onInitializationSuccess(YouTubeThumbnailView view, YouTubeThumbnailLoader loader) {
mLoaders.put(view, loader);
loader.setVideo((String) view.getTag());
}
@Override
public void onInitializationFailure(YouTubeThumbnailView thumbnailView, YouTubeInitializationResult errorReason) {
final String errorMessage = errorReason.toString();
Toast.makeText(mContext, errorMessage, Toast.LENGTH_LONG).show();
}
static class VideoHolder {
YouTubeThumbnailView thumb;
TextView title;
}
VideoListFragment.java
public class VideoListFragment extends ListFragment {
/**
* Empty constructor
*/
public VideoListFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setListAdapter(new VideoListAdapter(getActivity()));
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
final Context context = getActivity();
final String DEVELOPER_KEY = getString(R.string.DEVELOPER_KEY);
final YouTubeContent.YouTubeVideo video = YouTubeContent.ITEMS.get(position);
switch (position) {
case 0:
//Check whether we can actually open YT
if (YouTubeIntents.canResolvePlayVideoIntent(context)) {
//Opens the video in the YouTube app
startActivity(YouTubeIntents.createPlayVideoIntent(context, video.id));
}
break;
case 1:
if (YouTubeIntents.canResolvePlayVideoIntentWithOptions(context)) {
//Opens in the YouTube app in fullscreen and returns to this app once the video finishes
startActivity(YouTubeIntents.createPlayVideoIntentWithOptions(context, video.id, true, true));
}
break;
case 2:
//Issue #3 - Need to resolve StandalonePlayer as well
if (YouTubeIntents.canResolvePlayVideoIntent(context)) {
//Opens in the StandAlonePlayer, defaults to fullscreen
startActivity(YouTubeStandalonePlayer.createVideoIntent(getActivity(),
DEVELOPER_KEY, video.id));
}
break;
case 3:
//Issue #3 - Need to resolve StandalonePlayer as well
if (YouTubeIntents.canResolvePlayVideoIntentWithOptions(context)) {
//Opens in the StandAlonePlayer but in "Light box" mode
startActivity(YouTubeStandalonePlayer.createVideoIntent(getActivity(),
DEVELOPER_KEY, video.id, 0, true, true));
}
break;
}
}
YouTubeContent.java
public class YouTubeContent {
/**
* An array of YouTube videos
*/
public static List<YouTubeVideo> ITEMS = new ArrayList<>();
/**
* A map of YouTube videos, by ID.
*/
public static Map<String, YouTubeVideo> ITEM_MAP = new HashMap<>();
static {
addItem(new YouTubeVideo("tttG6SdnCd4", "Open in the YouTube App"));
addItem(new YouTubeVideo("x-hH_Txxzls", "Open in the YouTube App in fullscreen"));
addItem(new YouTubeVideo("TTh_qYMzSZk", "Open in the Standalone player in fullscreen"));
addItem(new YouTubeVideo("tttG6SdnCd4", "Open in the Standalone player in \"Light Box\" mode"));
}
private static void addItem(final YouTubeVideo item) {
ITEMS.add(item);
ITEM_MAP.put(item.id, item);
}
/**
* A POJO representing a YouTube video
*/
public static class YouTubeVideo {
public String id;
public String title;
public YouTubeVideo(String id, String content) {
this.id = id;
this.title = content;
}
@Override
public String toString() {
return title;
}
}
activity_main.xml中
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.bucky.myapp.MainActivity">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
row_layout.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- Video Thumbnail -->
<com.google.android.youtube.player.YouTubeThumbnailView
android:id="@+id/imageView_thumbnail"
android:layout_width="85dp"
android:layout_height="85dp"
android:layout_alignParentLeft="true"
android:layout_margin="5dp"
android:background="#000"
android:scaleType="centerCrop" />
<!-- Video Title -->
<TextView
android:id="@+id/textView_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@id/imageView_thumbnail"
android:layout_toRightOf="@id/imageView_thumbnail"
android:paddingBottom="5dp"
android:paddingRight="5dp"
android:text="video_list_title"
android:textColor="@android:color/black"
android:textSize="15sp" />
test.java
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/video_list"
android:name="com.example.bucky.myapp.VideoListFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
tools:context=".VideoListActivity"
tools:layout="@android:layout/list_content" />
`
logcat的。
Process: com.example.bucky.myapp, PID: 18751
android.view.InflateException: Binary XML file line #5: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:770)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:813)
at android.view.LayoutInflater.inflate(LayoutInflater.java:511)
at android.view.LayoutInflater.inflate(LayoutInflater.java:415)
at com.example.bucky.myapp.test.onCreateView(test.java:19)
at android.app.Fragment.performCreateView(Fragment.java:2114)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:904)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1082)
at android.app.BackStackRecord.run(BackStackRecord.java:834)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1469)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:452)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6946)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Caused by: android.app.Fragment$InstantiationException: Trying to instantiate a class com.example.bucky.myapp.VideoListFragment that is not a Fragment
at android.app.Fragment.instantiate(Fragment.java:620)
at android.app.Fragment.instantiate(Fragment.java:596)
at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2125)
at android.view.LayoutInflater$FactoryMerger.onCreateView(LayoutInflater.java:178)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:740)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:813)
at android.view.LayoutInflater.inflate(LayoutInflater.java:511)
at android.view.LayoutInflater.inflate(LayoutInflater.java:415)
at com.example.bucky.myapp.test.onCreateView(test.java:19)
at android.app.Fragment.performCreateView(Fragment.java:2114)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:904)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1082)
at android.app.BackStackRecord.run(BackStackRecord.java:834)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1469)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:452)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6946)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Caused by: java.lang.ClassCastException
at android.app.Fragment.instantiate(Fragment.java:620)
at android.app.Fragment.instantiate(Fragment.java:596)
at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2125)
at android.view.LayoutInflater$FactoryMerger.onCreateView(LayoutInflater.java:178)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:740)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:813)
at android.view.LayoutInflater.inflate(LayoutInflater.java:511)
at android.view.LayoutInflater.inflate(LayoutInflater.java:415)
at com.example.bucky.myapp.test.onCreateView(test.java:19)
at android.app.Fragment.performCreateView(Fragment.java:2114)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:904)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1082)
at android.app.BackStackRecord.run(BackStackRecord.java:834)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1469)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:452)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6946)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
答案 0 :(得分：0)
尝试加载实际的ListFragment
setContentView(R.layout.activity_main);
Button btn = (Button) findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getFragmentManager()
.beginTransaction()
.add(R.id.content_frame, new VideoListFragment())
.commit();
}
});