Develop Reference

.findViewById() returns null

So, I am trying to use a Switch in my Android app's SettingsFragment but it seems the IDE just won't see it in the XML. I used the debugger and it seems root.findViewById(R.id.physicalEffortSwitch) returns null.. it just doesn't make any sense.. anyone please?
This would be my XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="100dp">
<Switch
android:id="#+id/physicalEffortSwitch"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingHorizontal="30dp"
android:paddingVertical="17sp"
android:text="#string/show_jobs_that_require_physical_effort"
android:textSize="15sp"
android:checked="false"
android:textOff="#string/off"
android:textOn="#string/on"
/>
<Button
android:id="#+id/saveChangesButton"
android:layout_width="340dp"
android:layout_height="wrap_content"
android:layout_marginTop="350dp"
android:layout_gravity="center_horizontal"
android:paddingVertical="20dp"
android:paddingHorizontal="15dp"
android:text="#string/save_changes"
android:background="#d3d3d3"
/>
</LinearLayout>
And this is my SettingsFragment code:
public class SettingsFragment extends Fragment {
private View root;
private boolean physicalEffortPosts;
public static int range;
public static boolean physicalEffort;
public View onCreateView(#NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
root = inflater.inflate(R.layout.fragment_settings, container, false);
setup();
return root;
}
private void setup(){
Switch physicalEffortSwitch = (Switch) this.root.findViewById(R.id.physicalEffortSwitch);
physicalEffortSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
physicalEffort = physicalEffortSwitch.isChecked();
}
});
}

Check that the Switch class you imported in your java file is the correct one (e.g. the same one you used in the xml). This often happens with Toolbar (there are at least two, and if you import the wrong one and things don't work right/can't be cast and end up null).

Playing new videos with Youtube Api on Android

I'm developing an app with Android Studio for which I need the Youtube API. The problem is that I want the video to be played
every time the user clicks on "Reproducir"("play"). So I have researched how to load a video and everybody says to use the function
initializates that will call onInitializationSuccess and playes there. But if I want to load new videos, parsing the url and playing the new videos I can't. I tried calling the initialization everytime the user clicks on Reproducir but in that case It ig.
public class AddVideoActivity extends YouTubeBaseActivity implements YouTubePlayer.OnInitializedListener{
private YouTubePlayerView youTubeView;
private EditText urlTxtView;
private Button playButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_video);
youTubeView = (YouTubePlayerView) findViewById(R.id.youtube_player_add);
urlTxtView = (EditText) findViewById(R.id.urlYoutube);
playButton = (Button) findViewById(R.id.buttonPlay);
playButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
youTubeView.initialize(Config.YOUTUBE_API_KEY, (YouTubePlayer.OnInitializedListener) view.getContext());
}
});
}
#Override
public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean b) {
String url = urlTxtView.getText().toString();
Log.d("1",url );
youTubePlayer.loadVideo("a4NT5iBFuZs");
}
#Override
public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult result) {
Toast.makeText(this, "ERROR:"+result.toString(), Toast.LENGTH_LONG).show();
}
XML Layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/textView3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/action_add_video"
android:textStyle="normal|bold"
android:textSize="30sp"
android:gravity="center_horizontal"
android:layout_marginBottom="20dp" />
<com.google.android.youtube.player.YouTubePlayerView
android:id="#+id/youtube_player_add"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#fff"/>
<EditText
android:id="#+id/tituloVideo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Titulo"
android:inputType="textPersonName" />
<EditText
android:id="#+id/urlYoutube"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="URL o buscar con #youtube"
android:inputType="textPersonName" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="#+id/buttonCancelar"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Cancelar" />
<Button
android:id="#+id/buttonPlay"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Reproducir" />
<Button
android:id="#+id/buttonGuardar"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Guardar" />
</LinearLayout>
</LinearLayout>
Log:
W/YouTubeAndroidPlayerAPI: YouTube video playback stopped due to unauthorized overlay on top of player. The YouTubePlayerView is obscured by android.view.View{a21cb6f V.ED.... ........ 0,0-768,50 #102002f android:id/statusBarBackground}. Bottom edge 36 px below YouTubePlayerView's top edge. .
Here there is an image of the idea:
Picture of Android emulator, the user should introduce an url, clicks on Reproducir and plays the video from the url

If you are reinitilize the youtube video video view if already its been initialize thn first you need to release exising youtube view.
Please check below code
Specifically i've changed initialize part on Play button click
playButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (youTubePlayer != null) {
youTubePlayer.release();
}
youTubeView.initialize("AIzaSyDo9p_Qjy8XRBdFnVOaIx586MzHHLOUopw", (YouTubePlayer.OnInitializedListener) view.getContext());
}
});
Entire Activity code
public class AddVideoActivity extends YouTubeBaseActivity implements YouTubePlayer.OnInitializedListener {
private YouTubePlayerView youTubeView;
private EditText urlTxtView;
private Button playButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_video);
youTubeView = (YouTubePlayerView) findViewById(R.id.youtube_player_add);
urlTxtView = (EditText) findViewById(R.id.urlYoutube);
playButton = (Button) findViewById(R.id.buttonPlay);
playButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (youTubePlayer != null) {
youTubePlayer.release();
}
youTubeView.initialize(Config.YOUTUBE_API_KEY, (YouTubePlayer.OnInitializedListener) view.getContext());
}
});
}
private YouTubePlayer youTubePlayer;
#Override
public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean wasRestored) {
this.youTubePlayer = youTubePlayer;
String url = urlTxtView.getText().toString();
Log.d("1", url);
if (!wasRestored) {/// here videoid you need to pass not entire video URL
youTubePlayer.loadVideo(url);
}
}
#Override
public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult result) {
Toast.makeText(this, "ERROR:" + result.toString(), Toast.LENGTH_LONG).show();
}
}
to load video you need to pass video id not video url.So with assumption tht in edit text video id will be pass or if url thn you will get the video id from url and thn video will be loaded
this.youTubePlayer = youTubePlayer;
String url = urlTxtView.getText().toString();
Log.d("1", url);
if (!wasRestored) {/// here videoid you need to pass not entire video URL
youTubePlayer.loadVideo(url);
}
And for below log
Log: W/YouTubeAndroidPlayerAPI: YouTube video playback stopped due to
unauthorized overlay on top of player. The YouTubePlayerView is
obscured by android.view.View{a21cb6f V.ED.... ........ 0,0-768,50
102002f android:id/statusBarBackground}. Bottom edge 36 px below YouTubePlayerView's top edge.
you can refer answer https://stackoverflow.com/a/29676512/1140237
in your case for this log... issue is with Application or Activity theme. Give No ActionBarTheme to resolve that error

Trouble editing TextView within Fragment

So I am still fairly new to working with Android Studio and everything in it. I have been stuck on trying to get fragments to communicate directly with each other. Here I'm simply just trying to set the TextView text element within one of my fragments. I have looked for hours and tried a lot, but I'm not sure what to do. Also, I am implementing my fragments through code in a FrameLayout.
Here is my fragment whose text value I'm trying to edit:
public class ReceivingFrag extends Fragment {
TextView sender;
public void updateText(String text) {
sender.setText(text);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.frag_sender, container, false);
sender = (TextView) v.findViewById(R.id.sender);
return v;
}
}
I believe my root problem is that getView() and sender both return Null. I also understand that fragments are not technically views, but rather aid in the layout of views and ViewGroups. Any help is appreciated.
Not sure if it helps, but this is the method that calls the updateText() method within the ReceivingFrag class.
public void sendText(String text){
ReceivingFrag frag = new ReceivingFrag();
getSupportFragmentManager().beginTransaction().add(R.id.receiving_container, frag).commit();
getSupportFragmentManager().executePendingTransactions()
frag.updateText(text);
}
**Edit:
This is my MainActivity class that is calling and creating the Fragment:
public class MainActivity extends AppCompatActivity implements SendingFragment.TextClicked {
private static final String TAG = MainActivity.class.getSimpleName();
public final static String EXTRA_MESSAGE = "com.example.myfirstapp.MESSAGE";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String[] myStringArray = {"Hello", "Nice To See You", "Bye"};
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, myStringArray);
ListView listView = (ListView) findViewById(R.id.mobile_list);
listView.setAdapter(adapter);
sendText("Hello");
}
#Override
public void sendText(String text){
ReceivingFrag frag = new ReceivingFrag();
getSupportFragmentManager().beginTransaction().add(R.id.receiving_container, frag).commit();
getSupportFragmentManager().executePendingTransactions();
frag.updateText(text);
}}
**Edit 2:
This is the MainActivity layout file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/apk/tools"
xmlns:tools2="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="1">
<EditText android:id="#+id/edit_message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="#string/edit_message"
android:layout_weight="1" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="sendMessage"
android:text="#string/button_send"/>
</LinearLayout>
<ListView android:id="#+id/mobile_list"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<FrameLayout
android:id="#+id/receiving_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></FrameLayout></LinearLayout>
And this is the layout for the Fragment:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/sender"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/frag_sender"
android:background="#color/gray"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"/></LinearLayout>
Solution:
So as mentioned below, the runtime error was fixed by adding
#Override
protected void onResume() {
super.onResume();
sendText("hello");
}
to the MainActivity class. After reading from https://developer.android.com/guide/components/fragments.html#Lifecycle
I think the statement
"Once the activity reaches the resumed state, you can freely add and remove fragments to the activity. Thus, only while the activity is in the resumed state can the lifecycle of a fragment change independently."
best explains the situation and why the error initially occurred.

If you instead put the sendText() in your onResume() like this,
#Override
protected void onResume() {
super.onResume();
sendText("Hello");
}
It will not give you the Null Pointer Exception. The fragment is still null when you call on it from onCreate().

Change your Fragment to this:
public class ReceivingFrag extends Fragment {
private TextView sender;
public void updateText(String text) {
sender.setText(text);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.frag_sender, container, false);
sender = (TextView) v.findViewById(R.id.sender);
return v;
}
}
and in your activity, before calling the updateText method, make sure the fragment transaction has executed by doing:
public void sendText(String text){
ReceivingFrag frag = new ReceivingFrag();
getSupportFragmentManager().beginTransaction().add(R.id.receiving_container, frag).commit();
getSupportFragmentManager().executePendingTransactions();
frag.updateText(text);
}

Android: Can't get YouTube Player API work inside of a fragment

I'm trying to get my app to play a YouTube video in a fragment, as This Official Documentation said that you can play YouTube videos in fragments.
But i can't get it done.
This is my code:
SingleArticleFragment:
public class SingleArticleFragment extends YouTubePlayerSupportFragment implements
YouTubePlayer.OnInitializedListener {
public static final String API_KEY = "my api key";
public static final String YOUTUBE_VIDEO_CODE = "_oEA18Y8gM0";
// YouTube player view
private YouTubePlayerView youTubeView;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.article, container, false);
return v;
}
#Override
public void onViewCreated (View view, Bundle savedInstanceState) {
youTubeView = (YouTubePlayerView) getActivity().findViewById(R.id.youtube_view);
// Initializing video player with developer key
youTubeView.initialize(API_KEY, this);
}
#Override
public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean b) {
if (!b) {
// loadVideo() will auto play video
// Use cueVideo() method, if you don't want to play it automatically
youTubePlayer.cueVideo(YOUTUBE_VIDEO_CODE);
// Hiding player controls
youTubePlayer.setPlayerStyle(YouTubePlayer.PlayerStyle.CHROMELESS);
}
}
#Override
public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult youTubeInitializationResult) {
if (youTubeInitializationResult.isUserRecoverableError()) {
youTubeInitializationResult.getErrorDialog(getActivity(), 1).show();
} else {
String errorMessage = "There was an error initializing the YouTubePlayer";
Toast.makeText(getActivity(), errorMessage, Toast.LENGTH_LONG).show();
}
}
}
And this is article.xml:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:background="#color/white">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="wrap_content"
android:orientation="vertical">
<!-- Cover Video -->
<com.google.android.youtube.player.YouTubePlayerView
android:id="#+id/youtube_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="30dp" />
<!-- Article Cover Photo -->
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/single_article_cover_photo"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:layout_weight=".14"/>
<!-- Article Title -->
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/single_article_title"
android:layout_gravity="center"
android:textColor="#color/black"
android:textSize="20sp"
android:textStyle="bold"
android:padding="10dp"
android:layout_weight=".14"/>
</LinearLayout>
</ScrollView>
LogCat Errors:
android.view.InflateException: Binary XML file line #11: Error inflating class com.google.android.youtube.player.YouTubePlayerView
.
.
.
Caused by: java.lang.IllegalStateException: A YouTubePlayerView can only be created with an Activity which extends YouTubeBaseActivity as its context.
So what LogCat is telling me: YouTube only works in Activities!, but android documentation says otherwise.
Can anybody help here please ?
Thanks in advance.

You are mixing two different approaches.
You can either use a YouTubePlayerView together with a YouTubeBaseActivity or you can simply use a YouTubePlayerFragment/YouTubePlayerSupportFragment. Using a YouTubePlayerView inside a YouTubePlayerFragment is simply wrong.
If you use the first approach (view + activity), you need to place the view in your XML and then set the YouTubePlayer to play inside that view.
If you use the second approach, you simply need to load the fragment in an appropriate container, initialize the YouTubePlayer and play the video.
SOLUTION 1
Remove the YouTubePlayerView from your XML and your code and replace it with a FrameLayout that will contain the YouTubeSupportFragment. Then, use a ChildFragmentManager to load the YouTubeSupportFragment inside that FrameLayout.
SOLUTION 2
Simply make your Activity extend the YouTubeBaseActivity, leave everything else as it is.

Android YouTube API: Can't reinitialize YouTubePlayerFragment with new YouTube video

I am trying to load a different video into a YoutubePlayer fragment when a button is clicked. My button has an onclick listener of testClick. When I click the button, I get the following exception: "UsupportedExeception: no views can be added on top of player". The initialize method also isn't being called when I initialize the new video from my onclick method. How can I a new YouTubeVideo to be loaded into the previously used YouTubePlayerFragment, and how I can get the initialize method to be called from my onClick method?
public class ExersizeListActivity extends Activity implements
YouTubePlayer.OnInitializedListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_exersize_list);
}
public void testClick(View v) {
//new YouTube Fragment to replace old one
YouTubePlayerFragment youTubePlayerFragment=YouTubePlayerFragment.newInstance();
youTubePlayerFragment.initialize(YoutubeAPIKey.API_KEY, this);
FragmentManager fragManager=getFragmentManager();
FragmentTransaction fragmentTransaction=fragManager.beginTransaction();
fragmentTransaction.replace(R.id.youtube_fragment, youTubePlayerFragment);
fragmentTransaction.commit();
}
#Override
public void onInitializationFailure(Provider arg0,
YouTubeInitializationResult arg1) {
Log.e(null, "it bombed");
}
//not being called, and in current state would reinitialize with the same video
#Override
public void onInitializationSuccess(Provider arg0,
YouTubePlayer youtubePlayer, boolean arg2) {
youtubePlayer.cueVideo("YNKehLXpLRI");
}
}
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<fragment
android:id="#+id/youtube_fragment"
android:name="com.google.android.youtube.player.YouTubePlayerFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="#+id/randomizeButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Randomize!"
android:layout_below="#+id/youtube_fragment"
android:onClick="testClick"/>
</RelativeLayout>

Rather than defining the fragment in the xml layout file with the <fragment> tag, define a FrameLayout container, necessary when changing fragments dinamically at runtime:
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<FrameLayout
android:id="#+id/youtube_fragment"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="#+id/randomizeButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Randomize!"
android:layout_below="#+id/youtube_fragment"
android:onClick="testClick"/>
</RelativeLayout>
You will need to add the first YouTubeVideoFragment in onCreate() with a FragmentTransaction, and when the user clicks the button, the code you already have in testClick() should work.