Develop Reference

What's the best way to open the last displayed fragment upon reopening the app?

I am using drawerlayout to allow the user to open different questionnaires. The questions in the questionnaire are different fragments. The problem is that when a questionnaire is started and say the use goes to question no. 5 and exits the app then she or he will have to start from the home page ie first fragment in the drawer layout. How do I save the last fragment ie question shown so that I can show it again when the app is reopened?
Below is the code in one of the fragments that do not open up if the user taps the Home button.
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) { \\ handle view related code and triggering other functions }
#Override
public void onAttach(#NonNull Context context) {
super.onAttach(context);
cardContext = context;
if (context instanceof OnShoppingDoneListener) {
onShoppingDoneListener = (OnShoppingDoneListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
#Override
public void onResume() {
super.onResume();
bundle = getArguments();
}
#Override
public void onStart() {
super.onStart();
}
#Override
public void onDetach() {
super.onDetach();
onShoppingDoneListener = null;
}
#Override
public void onSaveInstanceState(#NonNull Bundle outState) {
super.onSaveInstanceState(outState);
outState.putSerializable("cartContent", selectionItemArrayList);
}
And here is the relevant code Main Activity where I open that particular fragment:
public class MainActivity extends AppCompatActivity implements
OnRestaurantSelect {
public void onRestaurantSelect(Bundle bundle){
boolean direction = bundle.getBoolean("direction");
if (direction) {
MenuCardFragment fragment = new MenuCardFragment();
openFragment(bundle, fragment, true);
} else {
AddressFragment fragment = new AddressFragment();
openFragment(bundle, fragment, false);
}
}
private void openFragment(Bundle bundle, Fragment fragment, Boolean direction) {
// Passing the pickup or delivery option + address + schedule + restaurant + order details + payment
fragment.setArguments(bundle);
//Starting fragment with animation
if (direction) {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction().setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_right, R.anim.enter_from_right, R.anim.exit_to_right).replace(R.id.frame_container, fragment, null);
fragmentTransaction.commit();
} else {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction().setCustomAnimations(R.anim.enter_from_left, R.anim.exit_to_left, R.anim.enter_from_left, R.anim.exit_to_left).replace(R.id.frame_container, fragment, null);
fragmentTransaction.commit();
}
}

Design a key for each fragment, when the app exits, save that key in a SharedPreference, than when the app restart, get that SharedP and open that fragment

GET YOUTUBE KEY_VIDEO_ID

How to get youtube key_vedio_id please help me to find-out this problem.
This is my code please and correct me if i wrong any where.
public class YouTubeActivity extends YouTubeBaseActivity implements YouTubePlayer.OnInitializedListener {
private static final int RECOVERY_DIALOG_REQUEST = 1;
public static final String KEY_VIDEO_ID = "KEY_VIDEO_ID";
private String mVideoId;
#Override
protected void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.activity_youtube);
final Bundle arguments = getIntent().getExtras();
if (arguments != null && arguments.containsKey(KEY_VIDEO_ID)) {
mVideoId = arguments.getString(KEY_VIDEO_ID);
}
final YouTubePlayerView playerView = (YouTubePlayerView) findViewById(R.id.youTubePlayerView);
playerView.initialize(getString(R.string.DEVELOPER_KEY_YOU_TUBE), this);
}
#Override
public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean restored) {
//Here we can set some flags on the player
//This flag tells the player to switch to landscape when in fullscreen, it will also return to portrait
//when leaving fullscreen
youTubePlayer.setFullscreenControlFlags(YouTubePlayer.FULLSCREEN_FLAG_CONTROL_ORIENTATION);
//This flag tells the player to automatically enter fullscreen when in landscape. Since we don't have
//landscape layout for this activity, this is a good way to allow the user rotate the video player.
youTubePlayer.addFullscreenControlFlag(YouTubePlayer.FULLSCREEN_FLAG_ALWAYS_FULLSCREEN_IN_LANDSCAPE);
//This flag controls the system UI such as the status and navigation bar, hiding and showing them
//alongside the player UI
youTubePlayer.addFullscreenControlFlag(YouTubePlayer.FULLSCREEN_FLAG_CONTROL_SYSTEM_UI);
if (mVideoId != null) {
if (restored) {
youTubePlayer.play();
} else {
youTubePlayer.loadVideo(mVideoId);
}
}
}
#Override
public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult youTubeInitializationResult) {
if (youTubeInitializationResult.isUserRecoverableError()) {
youTubeInitializationResult.getErrorDialog(this, RECOVERY_DIALOG_REQUEST).show();
} else {
//Handle the failure
Toast.makeText(this, R.string.error_init_failure, Toast.LENGTH_LONG).show();
}
}
}

YoutubePlayerSupportFragment inside Viewpager

I have about 5 different videos from youtube and I want to put them into viewpager to slide them. Is there any solution for this with explanation, because I searched here and at different sites, but can't find something useful. Thank you for attention

You have to call YouTubePlayerSupportFragment.reset() on the old YouTubePlayer when the ViewPager is switched and then YouTubePlayerSupportFragment.initialize(). This requires responding to the TabLayout's onTabSelected events which cant use .setupWithViewPager (which swallows both the ViewPager and TabLayouts view change events). This is roughly what's needed in the adapter (initialisePlayer and shutDownPlayer are called in response to tab changes, in the fragment that sets up the adapter, ViewPager and TabLayout):
private SparseArray<YouTubePlayerSupportFragment> fragments = new SparseArray<>(3);
private SparseArray<YouTubePlayer> players = new SparseArray<>(3);
#Override
public android.support.v4.app.Fragment getItem(final int position) {
YouTubePlayerSupportFragment fragment = new YouTubePlayerSupportFragment();
fragments.put(position, fragment);
return fragment;
}
public void initialisePlayer(final int position) {
YouTubePlayerSupportFragment fragment = fragments.get(position);
fragment.initialize(API_KEY, new YouTubePlayer.OnInitializedListener() {
#Override
public void onInitializationSuccess(final YouTubePlayer.Provider provider, final YouTubePlayer youTubePlayer, final boolean b) {
players.put(position, youTubePlayer);
youTubePlayer.cueVideo(getVids()[position]);
}
#Override
public void onInitializationFailure(final YouTubePlayer.Provider provider, final YouTubeInitializationResult youTubeInitializationResult) {
}
});
}
public void shutDownPlayer(int position) {
YouTubePlayer player = players.get(position);
if (player == null) {
return;
}

java.lang.IllegalStateException: YouTubeServiceEntity not initialized error when using YouTubePlayerApi

I'm using YouTubePlayerAPI and YouTubePlayerSupportFragment in my app and I'm getting the following error, but I couldn't find out what is causing it. I've been looking for information but I haven't found anything useful.
java.lang.IllegalStateException: YouTubeServiceEntity not initialized
at android.os.Parcel.readException(Parcel.java:1433)
at android.os.Parcel.readException(Parcel.java:1379)
at com.google.android.youtube.player.internal.l$a$a.a(Unknown Source)
at com.google.android.youtube.player.internal.o.a(Unknown Source)
at com.google.android.youtube.player.internal.ad.a(Unknown Source)
at com.google.android.youtube.player.YouTubePlayerView.a(Unknown Source)
at com.google.android.youtube.player.YouTubePlayerView$1.a(Unknown Source)
at com.google.android.youtube.player.internal.r.g(Unknown Source)
at com.google.android.youtube.player.internal.r$c.a(Unknown Source)
at com.google.android.youtube.player.internal.r$b.a(Unknown Source)
at com.google.android.youtube.player.internal.r$a.handleMessage(Unknown Source)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
In the stackstrace there isn't any line number pointing to any of my classes or activities.
Any idea of it?
Thanks!
EDIT
My custom YoutubePlayerFragment Class: YouTubeVideoPlayerFragment.java
public class YouTubeVideoPlayerFragment extends YouTubePlayerSupportFragment {
private static final String ARG_URL = "url";
// ===========================================================
// Constructors
// ===========================================================
/**
* Mandatory empty constructor for the fragment manager to instantiate the
* fragment (e.g. upon screen orientation changes).
*/
public YouTubeVideoPlayerFragment() {
}
/**
* Factory method to generate a new instance of the fragment given a video URL.
*
* #param url The video url this fragment represents
* #return A new instance of this fragment with itemId extras
*/
public static YouTubeVideoPlayerFragment newInstance(String url) {
final YouTubeVideoPlayerFragment mFragment = new YouTubeVideoPlayerFragment();
// Set up extras
final Bundle args = new Bundle();
args.putString(ARG_URL, url);
mFragment.setArguments(args);
// Initialize YouTubePlayer
mFragment.init();
return mFragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
private void init(){
initialize(Constants.API_KEY, new YouTubePlayer.OnInitializedListener() {
#Override
public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean wasRestored) {
if (!wasRestored) {
youTubePlayer.cueVideo(getArguments().getString(ARG_URL));
youTubePlayer.setShowFullscreenButton(false);
}
}
}
fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:background="#color/black" >
<!-- For YoutubeFragment -->
<FrameLayout
android:id="#+id/youtube_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
calling method:
// Create a new instance of YouTubeVideoPlayerFragment providing video id
// and place it in the corresponding FrameLayout
final YouTubeVideoPlayerFragment youTubeVideoPlayerFragment = YouTubeVideoPlayerFragment.newInstance(VIDEO_ID);
final FragmentTransaction ft = getChildFragmentManager().beginTransaction();
ft.replace(R.id.youtube_fragment, youTubeVideoPlayerFragment);
ft.commit();
EDIT
I've found out the origin of that error. This is the scenario:
The activity starts. In onCreate() it instantiates a new YouTubeVideoPlayerFragment and initializes YouTube object (which starts the YouTubeServiceEntity internally) in its newInstance() method. Then the YouTube fragment that was instantiated before, is attached with FragmentManager to the corresponding FrameLayout while video is loading.
Here is the issue: If user exits the activity before video had been loaded, the exception is thrown.
So if user want to exit from the activity in that case, what should I do and how? I don't really know what to do!

Once again, do NOT use fragment constructors or factory methods to work with lifecycle or context bound entities. Simply put, such entities can only be used after super.onCreate(...) has been called.
The question now is, when to call the init method?
Here's what YouTubePlayerFragment documentation says:
The YouTubePlayer associated with this fragment will be released whenever its onDestroyView() method is called. You will therefore have to re-call initialize(String, YouTubePlayer.OnInitializedListener) whenever the activity associated with this fragment is recreated, even if the fragment instance is retained across activity re-creation by setting setRetainInstance(boolean).
You may be tempted to put init() in onActivityCreated but that's too late, since onStart was already called and layout already performed.
Counterpart to onDestroyView is onViewCreated and that's the perfect candidate.
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
init();
}
As suggested call setRetainInstance(true) in the fragment's constructor. When the activity is recreated the fragment will not be recreated, only its UI will go through lifecycle events.

I see the same error reported from a Huawei cellphone.
I see an explanation here:
https://github.com/youtube/yt-android-player/issues/23
Not sure if there is a way to catch the exception in our code.

The problem is the initialization of the Youtube fragment. YouTubePlayerSupportFragment has to be extended in a class of yours and overrides some methods. You have to control the screen orientation and the onSaveInstanceState.
public class YouTubePlayerFragment extends YouTubePlayerSupportFragment {
private YouTubePlayer mPlayer;
public static YouTubePlayerFragment newInstance() {
return new YouTubePlayerFragment();
}
#Override public void onCreate(Bundle bundle) {
super.onCreate(bundle);
setRetainInstance(true);
}
#Override
public void initialize(String s, YouTubePlayer.OnInitializedListener onInitializedListener) {
super.initialize(s, new YouTubePlayer.OnInitializedListener() {
#Override public void onInitializationSuccess(YouTubePlayer.Provider provider,
YouTubePlayer youTubePlayer, boolean b) {
mPlayer = youTubePlayer;
onInitializedListener.onInitializationSuccess(provider, youTubePlayer, b);
}
#Override public void onInitializationFailure(YouTubePlayer.Provider provider,
YouTubeInitializationResult youTubeInitializationResult) {
onInitializedListener.onInitializationFailure(provider, youTubeInitializationResult);
}
});
}
#Override public void onDestroyView() {
if (mPlayer != null) {
mPlayer.release();
}
super.onDestroyView();
}
public YouTubePlayer getPlayer() {
return mPlayer;
}
}
YoutubeFragment.class
public class YoutubeFragment extends Fragment {
private static final String EXTRA_PLAYED_VIDEO = "EXTRA_PLAYED_VIDEO";
private static final String EXTRA_IS_PLAYING = "EXTRA_IS_PLAYING";
private static final String YOUTUBE_FRAGMENT = "YOUTUBE_FRAGMENT";
private static final String EXTRA_YOUTUBE_ID = "EXTRA_YOUTUBE_ID";
private RelativeLayout youtubeLayoutContainer;
private String youtubeId;
private int playedVideo;
private boolean isPlaying;
YouTubePlayer.OnInitializedListener onInitializedListener =
new YouTubePlayer.OnInitializedListener() {
#Override
public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer player,
boolean wasRestored) {
if (!wasRestored) {
setYouTubePlayer(player);
}
}
#Override public void onInitializationFailure(YouTubePlayer.Provider provider,
YouTubeInitializationResult error) {
}
};
public static YoutubeFragment newInstance(String youtubeId) {
YoutubeFragment youtubeElements = new YoutubeFragment();
Bundle bundle = new Bundle();
bundle.putString(EXTRA_YOUTUBE_ID, youtubeId);
youtubeElements.setArguments(bundle);
return youtubeElements;
}
#Override public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
#Nullable #Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container,
#Nullable Bundle savedInstanceState) {
View mView = inflater.inflate(R.layout.view_youtube_elements_item, container, false);
initViews(mView);
initYoutubeFragment();
return mView;
}
private void initViews(View view) {
youtubeLayoutContainer = (RelativeLayout) view.findViewById(R.id.youtubeLayoutContainer);
youtubeLayoutContainer.getViewTreeObserver()
.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#TargetApi(Build.VERSION_CODES.JELLY_BEAN) #Override public void onGlobalLayout() {
FrameLayout.LayoutParams lp =
new FrameLayout.LayoutParams(FrameLayout.LayoutParams.WRAP_CONTENT,
FrameLayout.LayoutParams.MATCH_PARENT);
youtubeLayoutContainer.setLayoutParams(lp);
if (AndroidSdkVersion.hasJellyBean16()) {
youtubeLayoutContainer.getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
}
});
}
private void initYoutubeFragment() {
try {
YouTubePlayerFragment youTubePlayerFragment2 = YouTubePlayerFragment.newInstance();
youTubePlayerFragment2.initialize(BuildConfig.YOUTUBE_DEVELOPER_KEY, onInitializedListener);
if (this.getActivity() != null && !this.getActivity().isFinishing()) {
getChildFragmentManager().beginTransaction()
.replace(R.id.youtubePlayerFragmentContent, youTubePlayerFragment2, YOUTUBE_FRAGMENT)
.commitAllowingStateLoss();
}
} catch (Exception ignored) {
}
}
public void setYouTubePlayer(final YouTubePlayer player) {
try {
if (player == null) {
return;
}
player.setShowFullscreenButton(true);
player.setPlayerStyle(YouTubePlayer.PlayerStyle.DEFAULT);
if (playedVideo >= 0) {
if (playedVideo == 0 || isPlaying) {
player.loadVideo(youtubeId, playedVideo);
} else {
player.cueVideo(youtubeId, playedVideo);
}
}
} catch (Exception ignored) {
}
}
#Override public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
if (savedInstanceState != null) {
playedVideo = savedInstanceState.getInt(EXTRA_PLAYED_VIDEO);
isPlaying = savedInstanceState.getBoolean(EXTRA_IS_PLAYING);
}
}
#Override public void onSaveInstanceState(Bundle outState) {
try {
YouTubePlayerFragment youTubePlayerSupportFragment =
(YouTubePlayerFragment) getChildFragmentManager().findFragmentByTag(YOUTUBE_FRAGMENT);
YouTubePlayer mPlayer = youTubePlayerSupportFragment.getPlayer();
if (mPlayer != null) {
outState.putInt(EXTRA_PLAYED_VIDEO, mPlayer.getCurrentTimeMillis());
outState.putBoolean(EXTRA_IS_PLAYING, mPlayer.isPlaying());
}
} catch (Exception ignored) {
}
super.onSaveInstanceState(outState);
}
}
Activity containing Youtube Fragment
public class YoutubeContentDataActivity extends BaseActivity {
private static final String EXTRA_YOUTUBE_VIDEO_ID = "EXTRA_YOUTUBE_VIDEO_ID";
private static final String TAG_RETAINED_FRAGMENT = "TAG_RETAINED_FRAGMENT";
public static void open(Context context, String videoId) {
Intent intent = new Intent(context, YoutubeContentDataActivity.class);
intent.putExtra(EXTRA_YOUTUBE_VIDEO_ID, videoId);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
#Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_youtube_main_container_layout);
FragmentManager fm = getSupportFragmentManager();
YoutubeFragment youtubeElementsFragment =
(YoutubeFragment) fm.findFragmentByTag(TAG_RETAINED_FRAGMENT);
// create the fragment and data the first time
if (youtubeElementsFragment == null) {
String videoId = getIntent().getStringExtra(EXTRA_YOUTUBE_VIDEO_ID);
// videoId = "17uHCHfgs60";//"ikO91fQBsTQ";
youtubeElementsFragment = YoutubeFragment.newInstance(videoId);
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.youtube_main_container, youtubeElementsFragment, TAG_RETAINED_FRAGMENT)
.commit();
}
}
#Override public void onPause() {
super.onPause();
if (isFinishing()) {
FragmentManager fm = getSupportFragmentManager();
YoutubeFragment youtubeElementsFragment =
(YoutubeFragment) fm.findFragmentByTag(TAG_RETAINED_FRAGMENT);
fm.beginTransaction().remove(youtubeElementsFragment).commit();
}
}
}

I could fix this error by using a ProgressDialog to wait until the player is loaded.

which file to render and play in android youtube player

I am successfully integrate YouTube Android Player API for my apps. I am curious to know about which file is rendered in the player. Every single video file may have several formats like 320dpi,720dpi & etc.
If my users, is in lower bandwidth; can i choose the file format or the API automatically detects which version would be played in that situation and vice-verse. My code:
public class YoutubeVideoActivity extends YouTubeBaseActivity implements
YouTubePlayer.OnInitializedListener, YouTubePlayer.OnFullscreenListener {
Activity activity = YoutubeVideoActivity.this;
public static final String API_KEY = "AIzaSyDN6Q9Pv4seQZqIcjB*********Po5k";
// public static final String VIDEO_ID = "psY0Botpi84";
public String new_id;
private boolean fullscreen;
private YouTubePlayerView playerView;
#Override
protected void onCreate(Bundle arg0) {
super.onCreate(arg0);
// Remove title bar
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_youtube_video);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
Intent intent = getIntent();
String video_link = intent.getExtras().getString("video_link");
try {
new_id = video_link.substring("http://www.youtube.com/watch?v="
.length());
if (new_id.equals("")) {
IndepententTVUtils.showCustomAlert(activity,
"Data is not availble. Press back key",
R.drawable.ic_new_launcher);
} else {
playerView = (YouTubePlayerView) findViewById(R.id.youtubeplayerview);
playerView.initialize(API_KEY, this);
}
} catch (Exception e) {
IndepententTVUtils.showCustomAlert(activity,
"Data is not availble", R.drawable.ic_new_launcher);
}
}
#Override
public void onInitializationFailure(Provider arg0,
YouTubeInitializationResult arg1) {
Toast.makeText(getApplicationContext(),
"To See this Video, Install Latest YouTube Application",
Toast.LENGTH_LONG).show();
}
#Override
public void onInitializationSuccess(Provider arg0, YouTubePlayer player,
boolean wasRestored) {
player.setOnFullscreenListener(this);
if (!wasRestored && new_id != null) {
player.cueVideo(new_id);
}
}
#Override
public void onFullscreen(boolean isFullscreen) {
fullscreen = isFullscreen;
}
}

The player sets video quality automatically according to the users bandwidth or internet speed, if it was not so there would be an option specifying the setPlaybackQuality in player.
There are only restricted options to change the player settings that are
here