Develop Reference

OnClickListener() crash in Fragment

For some reason, when I click on the Toolbar(toolbar) and Float button(button) in my app, the OnClickListener () method crashes the snippet and app
Although the ImageButton(OnOff) handler runs and does not crash the fragment
Fragment
public class ZnonkiFragment extends Fragment {
private SharedPreferences settings;
private ImageButton OnOff;
private ViewPager viewPager;
private DrawerLayout drawerLayout;
private MainActivity.PagerAdapter pagerAdapter;
private FloatingActionButton button;
final Context context = getActivity();
private androidx.appcompat.widget.Toolbar toolbar;
private TabLayout tabLayout;
private String ZvonOne, ZvonTwo;
private List<Fragment> list = new ArrayList<>();
private String url;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_znonki, container,
toolbar = view.findViewById(R.id.toolbar);
toolbar.setNavigationIcon(getResources().getDrawable(R.drawable.menu));
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(context,"lel",Toast.LENGTH_LONG).show();
}
});
//...
addListenerOnButton(view);
return view;
}
public boolean checkString(String string) {
try {
Integer.parseInt(string);
} catch (Exception e) {
return false;
}
return true;
}
public void addListenerOnButton (final View viewOne){
OnOff = viewOne.findViewById(R.id.onOff);
button = viewOne.findViewById(R.id.floatingActionButton);
OnOff.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//...
});
button.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(final View view) {
//...
});
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//...
});
}
}
XML
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".ZnonkiFragment">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="?attr/actionBarTheme"
app:title="Звонки"
app:titleTextColor="#FFFFFF" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/floatingActionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_margin="16dp"
android:clickable="true"
android:focusable="true"
app:backgroundTint="#color/colorAccent"
app:backgroundTintMode="src_atop"
app:srcCompat="#drawable/kek" />
<com.google.android.material.tabs.TabLayout
android:id="#+id/tabLayout4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="?attr/actionBarSize"
android:background="#color/colorPrimary"
android:isScrollContainer="true"
app:tabIndicatorColor="#android:color/white"
app:tabIndicatorHeight="6dp"
app:tabMode="scrollable"
app:tabSelectedTextColor="#android:color/white"
app:tabTextColor="#E6E6FA">
</com.google.android.material.tabs.TabLayout>
<ImageButton
android:layout_margin="16dp"
android:id="#+id/onOff"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:background="#null"
app:srcCompat="#drawable/on" />
<androidx.viewpager.widget.ViewPager
android:id="#+id/rager"
android:layout_width="match_parent"
android:layout_height="557dp"
android:layout_marginTop="105dp"
/>
</FrameLayout>
Although this code worked in the main activiti
I don't know why but there are no errors in debug mode

What Kundan has suggested is correct but the fix is much easier.
You don't need this:
final Context context = getActivity();
If you need to gain access to the context in a Fragment you can call requireContext() if you need access to the Activity you can call requireActivity()
So your toast message can become:
Toast.makeText(requireContext(),"lel",Toast.LENGTH_LONG).show();

I think main cause of this issue is
final Context context = getActivity();
which is used in
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(context,"lel",Toast.LENGTH_LONG).show();
}
});
please note the getActivity() method returns the current activity with which this fragment is attached. and you are calling while the fragment object is creating before it is attached to activity.
you can change the above code to :
Context context;
and override the method as
#Override
public void onAttach(Context context) {
super.onAttach(context);
this.context = context;
}
Hope this answers your question.

The solution is simple
In your fragment class file, dont create custom function for calling click events rather you can use the android's defaul method by simply implementing them in your class file and then override it. Thats makes the code more simpler and reusable in future.
public class ZnonkiFragment extends Fragment implements View.OnClickListener, View.OnLongClickListener {
private SharedPreferences settings;
private ImageButton OnOff;
private ViewPager viewPager;
private DrawerLayout drawerLayout;
private FloatingActionButton button;
final Context context = getActivity();
private TabLayout tabLayout;
private String ZvonOne, ZvonTwo;
private List<Fragment> list = new ArrayList<>();
private String url;
private Toolbar mToolbar;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_znonki, container, false);
mToolbar = view.findViewById(R.id.toolbar);
mToolbar.setNavigationIcon(getResources().getDrawable(R.drawable.ic_launcher_background));
mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(context, "lel", Toast.LENGTH_LONG).show();
}
});
//...
OnOff = view.findViewById(R.id.onOff);
OnOff.setOnClickListener(this);
OnOff.setOnLongClickListener(this);
button = view.findViewById(R.id.floatingActionButton);
return view;
}
public boolean checkString(String string) {
try {
Integer.parseInt(string);
} catch (Exception e) {
return false;
}
return true;
}
#Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.onOff:
//call your onclick function here...
break;
case R.id.floatingActionButton:
//call your onclick function here...
break;
}
}
#Override
public boolean onLongClick(View view) {
switch (view.getId()) {
case R.id.floatingActionButton:
//call your long click function here...
break;
}
return false;
}
}
I have left comments on particular Loc where you can add your code and check it. And the toolbar was crashing due to improper importing of the libraries. If you havent used the androidx library into your gradle file then you can go with simple toolbar which is of "import android.support.v7.widget.Toolbar". This will surely stop your onclick crash on toolbar.
If there is any issue, just let me know. Thank you.

How Do I Remove Selected Item From ArrayList and ArrayAdapter On Button Click?

I have ListView with a custom list layout. I am using an ArrayList and ArrayAdapter for this. I am having a difficult time removing selected items from the arraylist. I am not sure want I am doing wrong. Here's an example of a arraylist that I have:
Item A
Item B
Item C
Item D
Let's say that I selected Item C next on button clicked labeled "Remove" I want Item C removed from the list. How do I accomplish this? Currently my code only removes the item on index 0. I want selected item index to be removed.
Here's my codes...
Java Class:
public class MainActivity extends AppCompatActivity {
ListView lstVw;
Button addBtn, removeBtn, clearListBtn;
ArrayList<String> arrayList;
ArrayAdapter<String> adapter;
int getPosition = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lstVw = findViewById(R.id.lstView);
addBtn = findViewById(R.id.add_item_btn);
removeBtn = findViewById(R.id.remove_item_btn);
clearListBtn = findViewById(R.id.clear_list_btn);
arrayList = new ArrayList<>();
adapter = new ArrayAdapter<>(getApplicationContext(), R.layout.item_list, R.id.item_tv, arrayList);
lstVw.setAdapter(adapter);
lstVw.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String getItem = adapter.getItem(position);
getPosition = Integer.parseInt(getItem);
}
});
addBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final AlertDialog.Builder adb = new AlertDialog.Builder(MainActivity.this);
adb.setTitle("Enter Item Name");
final EditText itemTxt = new EditText(MainActivity.this);
itemTxt.setText(getString(R.string.default_item_name_value));
itemTxt.setInputType(InputType.TYPE_CLASS_TEXT);
adb.setView(itemTxt);
adb.setPositiveButton("Add", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
String getItem = itemTxt.getText().toString();
Set<String> s = new LinkedHashSet<>(arrayList);
if (s.contains(getItem)) {
arrayList.clear();
arrayList.addAll(s);
Toast.makeText(getApplicationContext(), getItem + " already exists in the list!", Toast.LENGTH_LONG).show();
} else {
arrayList.add(getItem);
adapter.notifyDataSetChanged();
}
}
});
adb.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
}
});
adb.create();
adb.show();
}
});
clearListBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (!arrayList.isEmpty()) {
arrayList.clear();
adapter.notifyDataSetChanged();
}
}
});
removeBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String getItem = arrayList.get(getPosition);
arrayList.remove(getItem);
adapter.notifyDataSetChanged();
Toast.makeText(getApplicationContext(), getItem + " is removed!", Toast.LENGTH_LONG).show();
}
});
}
}
Main XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/rl"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<ScrollView
android:layout_width="match_parent"
android:layout_height="650dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="650dp">
<ListView
android:id="#+id/lstView"
android:layout_width="match_parent"
android:layout_height="650dp"
tools:ignore="NestedScrolling" />
</RelativeLayout>
</ScrollView>
<include layout="#layout/action_buttons"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"/>
Action Buttons XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_gravity="center|top">
<Button
android:id="#+id/add_item_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:textAllCaps="false"
android:text="#string/add_item_text"
android:textSize="14sp"
android:textStyle="bold"
android:textColor="#android:color/black"/>
<Button
android:id="#+id/remove_item_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_toEndOf="#id/add_item_btn"
android:textAllCaps="false"
android:text="Remove Item"
android:textColor="#android:color/black"
android:textSize="14sp"
android:textStyle="bold"/>
<Button
android:id="#+id/clear_list_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_toEndOf="#id/remove_item_btn"
android:textAllCaps="false"
android:text="#string/clear_list_text"
android:textSize="14sp"
android:textStyle="bold"
android:textColor="#android:color/black"/>
My Custom List Layout XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/item_tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textStyle="bold"
android:textSize="20sp"
android:textColor="#android:color/black"/>
</ScrollView>
I appreciate the help! Thanks!

removeBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String getItem = arrayList.get(getPosition);
arrayList.remove(getItem);
adapter.notifyDataSetChanged();
Toast.makeText(getApplicationContext(), getItem + " is removed!", Toast.LENGTH_LONG).show();
}
});
From where are you getting this getPosition?

It looks to me like your int getPosition = 0; variable is not getting updated with your new position. On your click listener you are trying to parse the value of your selected item to an Integer, maybe you could try simply updating with the current position instead?
lstVw.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
getPosition = position;
}
});
Edit:
You could go with something like this:
Create an interface that your activity will implement and will be used by your adapter to notify a position change:
public interface PositionChangeListener {
void onPositionChanged(int newPosition);
}
Create a custom adapter:
public class CustomAdapterView extends BaseAdapter {
private Context context;
private PositionChangeListener listener;
private ArrayList<String> items;
public CustomAdapterView(Context context, ArrayList<String> items, PositionChangeListener listener) {
this.context = context;
this.items = items;
this.listener = listener;
}
#Override
public int getCount() {
return items.size();
}
#Override
public Object getItem(int position) {
return items.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = null;
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate( R.layout.item_list, null);
viewHolder = new ViewHolder();
viewHolder.txt = convertView.findViewById(R.id.item_tv);
viewHolder.txt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
listener.onPositionChanged(position);
}
});
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.txt.setText(items.get(position));
return convertView;
}
private class ViewHolder {
TextView txt;
}
}
And now in your activity:
public class MainActivity extends AppCompatActivity implements PositionChangeListener{
ListView lstVw;
Button addBtn, removeBtn, clearListBtn;
ArrayList<String> arrayList;
BaseAdapter adapter;
int getPosition = 0;
#Override
public void onPositionChanged(int newPosition) {
getPosition = newPosition;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lstVw = findViewById(R.id.lstView);
addBtn = findViewById(R.id.add_item_btn);
removeBtn = findViewById(R.id.remove_item_btn);
clearListBtn = findViewById(R.id.clear_list_btn);
arrayList = new ArrayList<>();
adapter = new CustomAdapterView(this, arrayList, this);
lstVw.setAdapter(adapter);
addBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final AlertDialog.Builder adb = new AlertDialog.Builder(MainActivity.this);
adb.setTitle("Enter Item Name");
final EditText itemTxt = new EditText(MainActivity.this);
itemTxt.setText("default item name");
itemTxt.setInputType(InputType.TYPE_CLASS_TEXT);
adb.setView(itemTxt);
adb.setPositiveButton("Add", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
String getItem = itemTxt.getText().toString();
Set<String> s = new LinkedHashSet<>(arrayList);
if (s.contains(getItem)) {
arrayList.clear();
arrayList.addAll(s);
Toast.makeText(getApplicationContext(), getItem + " already exists in the list!", Toast.LENGTH_LONG).show();
} else {
arrayList.add(getItem);
adapter.notifyDataSetChanged();
}
}
});
adb.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
}
});
adb.create();
adb.show();
}
});
clearListBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (!arrayList.isEmpty()) {
arrayList.clear();
adapter.notifyDataSetChanged();
}
}
});
removeBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String getItem = arrayList.get(getPosition);
arrayList.remove(getItem);
adapter.notifyDataSetChanged();
Toast.makeText(getApplicationContext(), getItem + " is removed!", Toast.LENGTH_LONG).show();
}
});
}
}

How to use Helpshift Embeddable Support Fragments Android

I am building an Android app that uses the Helpshift API. It was all working, but I am currently trying to move everything into a TabLayout, using Fragments and an ActionBar. I made a mini app to figure out functionality of the fragments without messing everything else up. I have a home screen where you click a button and it starts the activity containing the TabLayout with the Fragments. I cannot figure out how to make the embeddable support fragments show up in the TabLayout. I'm pretty new to Android, so sorry if my code is not the best. Right now the placeholder is not being replaced in the fragment transaction, and I can't figure out why. I would greatly appreciate any advice! Thank you :) Let me know if I can provide anything else
Here is my main activity class (Helpshift info has been redacted for privacy reasons, hopefully my issue can still be fixed)
public class MainActivity extends AppCompatActivity {
Context mContext;
public ConstraintLayout layout;
Activity goToFragment;
public Button start;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.home_screen);
mContext = getApplicationContext();
goToFragment = MainActivity.this;
start = (Button) findViewById(R.id.button);
start.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick (View view) {
launchFragments();
}
});
//HELPSHIFT SET UP
Core.init(All.getInstance());
InstallConfig installConfig = new InstallConfig.Builder()
.setScreenOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE)
.setEnableInAppNotification(true)
.build();
try {
Core.install(getApplication(),
"****APIKEY*****",
"****DOMAIN*****",
"****APPID******", installConfig);
} catch (InstallException e) {
android.util.Log.e("Helpshift", "install call : ", e);
}
}
private void launchFragments() {
Intent intent1 = new Intent(mContext, HomeTab.class);
intent1.putExtra("fragmentNumber", 0);
startActivity(intent1);
}
}
Here is my ViewPager Adapter class:
public class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager){
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
Here is my fragment activity class:
public class HomeTab extends AppCompatActivity {
// ImageButton FindCareButton;
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
public Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = getApplicationContext();
Intent intent1 = getIntent();
int var = intent1.getIntExtra("fragmentNumber", 0);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
viewPager.setCurrentItem(var);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
if (findViewById(R.id.placeholder) != null) {
if (savedInstanceState != null) {
return;
}
Fragment faqFragment = new Fragment();
faqFragment = Support.getFAQsFragment(HomeTab.this);
getSupportFragmentManager().beginTransaction().add(R.id.placeholder, faqFragment).commit();
}
}
private void setupViewPager(ViewPager viewPager){
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new FAQTab(), "FAQ");
viewPager.setAdapter(adapter);
}
}
Here is my FAQTab class:
public class FAQTab extends Fragment {
public FAQTab(){
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.faq_tab, container, false);
}
}
For layouts, my faq_tab layout is an empty FrameLayout with id "placeholder"
My home_screen layout is a ConstraintLayout with a button (id "button")
And here is my activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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.sasha.fragment_tester.MainActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/BarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:background="?android:attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"/>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabGravity="fill"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
/>
</android.support.design.widget.CoordinatorLayout>

How to disable Touch while video is playing

I am developing a Toddler(kids) app in which I have shown the YouTube videos thumbnails in a recyclerview and whenever the user clicks on any of the listed thumbnails that video plays in full screen YouTube intent( and all the videos after that plays in order automatically). I am succeed in doing so. The problem is now I want to disable the touch screen while the video is playing. I thought of making transparent layout and to show this transparent layout as upper layer on YouTube Full screen video intent but i dont know how to attach this layout with Youtube video intent.
Every kind of help is appreciated.
below is my code:
main_activity.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="2"
android:orientation="vertical"
tools:context="com.example.pc.fkidshell.Main4Activity">
<include layout="#layout/toolbar"
android:id="#+id/my_thirdtoolbar"/>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/VideoList"
android:layout_below="#+id/my_thirdtoolbar"
android:paddingTop="20dp"
android:scrollbars="vertical">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
video_row.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/thumbnailView"
android:layout_gravity="center_horizontal"/>
</LinearLayout>
mainactivity.javaL
public class Main4Activity extends AppCompatActivity implements YouTubeThumbnailView.OnInitializedListener, YouTubeThumbnailLoader.OnThumbnailLoadedListener{
Toolbar third_toolbar;
YouTubeThumbnailView thumbnailView;
YouTubeThumbnailLoader thumbnailLoader;
RecyclerView VideoList;
RecyclerView.Adapter adapter;
List<Drawable> thumbnailViews;
List<String> VideoId;
String videoid;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main4);
third_toolbar = (Toolbar) findViewById(R.id.my_thirdtoolbar);
setSupportActionBar(third_toolbar);
getSupportActionBar().setTitle(R.string.sectitle);
getSupportActionBar().setIcon(R.drawable.tblogo);
thumbnailViews = new ArrayList<>();
VideoList = (RecyclerView) findViewById(R.id.VideoList);
RecyclerView.LayoutManager layoutManager=new LinearLayoutManager(this);
VideoList.setLayoutManager(layoutManager);
adapter=new VideoListAdapter();
VideoList.setAdapter(adapter);
VideoId = new ArrayList<>();
thumbnailView = new YouTubeThumbnailView(this);
thumbnailView.initialize("API key", this);
}
#Override
public void onInitializationSuccess(YouTubeThumbnailView youTubeThumbnailView, YouTubeThumbnailLoader youTubeThumbnailLoader) {
thumbnailLoader = youTubeThumbnailLoader;
youTubeThumbnailLoader.setOnThumbnailLoadedListener(Main4Activity.this);
thumbnailLoader.setPlaylist("PLXRActLQ03oY_6AQb-5EMuKFYQA_fDE40");
}
#Override
public void onInitializationFailure(YouTubeThumbnailView youTubeThumbnailView, YouTubeInitializationResult youTubeInitializationResult) {
}
public void add() {
adapter.notifyDataSetChanged();
if (thumbnailLoader.hasNext())
thumbnailLoader.next();
}
#Override
public void onThumbnailLoaded(YouTubeThumbnailView youTubeThumbnailView, String s) {
thumbnailViews.add(youTubeThumbnailView.getDrawable());
VideoId.add(s);
add();
}
#Override
public void onThumbnailError(YouTubeThumbnailView youTubeThumbnailView, YouTubeThumbnailLoader.ErrorReason errorReason) {
}
public class VideoListAdapter extends RecyclerView.Adapter<VideoListAdapter.MyView>{
public class MyView extends RecyclerView.ViewHolder{
ImageView imageView;
public MyView(View itemView) {
super(itemView);
imageView= (ImageView) itemView.findViewById(R.id.thumbnailView);
}
}
#Override
public VideoListAdapter.MyView onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.video_row, parent, false);
return new MyView(itemView);
}
#Override
public void onBindViewHolder(VideoListAdapter.MyView holder, final int position) {
holder.imageView.setImageDrawable(thumbnailViews.get(position));
holder.imageView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v)
{
videoid=VideoId.get(position);
//startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.youtube.com/watch?v="+videoid+"&list=PLXRActLQ03oY_6AQb-5EMuKFYQA_fDE40")));
Intent intent=new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.youtube.com/watch?v="+videoid+"&index="+position+"&list=PLXRActLQ03oY_6AQb-5EMuKFYQA_fDE40"));
intent.putExtra("force_fullscreen",true);
startActivity(intent);
// Intent intenwt=YouTubeIntents.createPlayVideoIntent(Main4Activity.this,VideoId.get(position));
// intent.putExtra("force_fullscreen",true);
//startActivity(intent);
}
});
}
#Override
public int getItemCount() {
return thumbnailViews.size();
}
}
}

Try with following this will help you
https://stackoverflow.com/a/28429348/7234534

As stated in this thread, this is impossible as you cannot override the home button even if it is soft or hard button. However, you can use third party apps like Untouch which is a very popular one, and can be found in the play store. (Search for Untouch or touch block and it should come up.) You may also check on this blog that discussed some workaround for your issue. Hope this helps!

Passing data between two tab fragments in a SlidingTabslayout

I have an application which has one main activity which in turn hosts two tabs. Each tab is a fragment. The first tab has an editText and a Button and on button press the text entered by the user must be displayed on the second tab fragment which hosts only one textView. I am using a listener to pass the data but for some reason the app crashes when i press the submit button. Any help would be appreciated. Here is my code:
MainActivity.java
public class MainActivity extends AppCompatActivity implements OnEditTextListener {
Toolbar toolbar;
ViewPager pager;
ViewPagerAdapter adapter;
SlidingTabLayout tabs;
CharSequence Titles[] = {"Home", "Events"};
int Numboftabs = 2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Creating The Toolbar and setting it as the Toolbar for the activity
toolbar = (Toolbar) findViewById(R.id.tool_bar);
setSupportActionBar(toolbar);
// Creating The ViewPagerAdapter and Passing Fragment Manager, Titles fot the Tabs and Number Of Tabs.
adapter = new ViewPagerAdapter(getSupportFragmentManager(), Titles, Numboftabs);
// Assigning ViewPager View and setting the adapter
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
// Assiging the Sliding Tab Layout View
tabs = (SlidingTabLayout) findViewById(R.id.tabs);
tabs.setDistributeEvenly(true); // To make the Tabs Fixed set this true, This makes the tabs Space Evenly in Available width
// Setting Custom Color for the Scroll bar indicator of the Tab View
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
#Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.ColorPrimary);
}
});
// Setting the ViewPager For the SlidingTabsLayout
tabs.setViewPager(pager);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void OnEditText(String data) {
Tab2 newFragment = (Tab2)adapter.getItem(1);
newFragment.updateDisplay(data);
}
}
Tab1.java
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.text.Editable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
public class Tab1 extends Fragment
{
public interface OnEditTextListener {
public void OnEditText(String data);
}
OnEditTextListener editTextListener = null;
EditText edtText;
Button btnSubmit;
String val;
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
editTextListener = (OnEditTextListener) activity;
} catch (ClassCastException ex) {
ex.printStackTrace();
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.first_fragment, container, false);
return v;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
edtText = (EditText)getActivity().findViewById(R.id.edtText);
btnSubmit = (Button)getActivity().findViewById(R.id.btnSubmit);
btnSubmit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
val = edtText.getText().toString();
editTextListener.OnEditText(val);
}
});
}
}
Tab2.java
public class Tab2 extends Fragment {
public static final String TAG = "DATA";
public static final String SAVE = "NBHJB";
String newdata = "";
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (savedInstanceState != null)
savedInstanceState.getInt(SAVE);
return inflater.inflate(R.layout.second_fragment, container, false);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (savedInstanceState != null) {
savedInstanceState.getString(SAVE);
}
}
public void updateDisplay(String data) {
newdata = data;
TextView randomData = (TextView) getActivity().findViewById(R.id.txtView1);
randomData.setText(newdata);
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putString(SAVE, newdata);
}
MainActivity.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<include
android:id="#+id/tool_bar"
layout="#layout/tool_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<View
android:layout_height="2dip"
android:background="#color/tabsScrollColor"
android:layout_width="wrap_content" />
<com.example.regi.tabsprove.SlidingTabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/prove"
android:elevation="2dp" />
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"></android.support.v4.view.ViewPager>
</LinearLayout>
second_fragment.xml
<?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="horizontal">
<TextView
android:id="#+id/txtView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:padding="10dp"
android:text="Default Text"
android:textSize="20dp" />
</LinearLayout>
This is the error that I get
java.lang.NullPointerException
at com.example.regi.tabsprove.Tab2.updateDisplay(Tab2.java:36)
at com.example.regi.tabsprove.MainActivity.OnEditText(MainActivity.java:79)
at com.example.regi.tabsprove.Tab1$1.onClick(Tab1.java:51)
at android.view.View.performClick(View.java:4198)
at android.view.View$PerformClick.run(View.java:17158)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4918)
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:1004)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771)
at dalvik.system.NativeStart.main(Native Method)

I'm pretty sure that the line Tab2 newFragment = (Tab2)adapter.getItem(1); is creating a new instance of Tab2 instead of giving you the Fragment that you need. You should find a better way to get the instance of the Fragment that has been built to you by the ViewPager; I'm sure that this post can help you.

I found your design a bit complicated than regular data passing. From the logs, the issue is the program unable to find txtView1 in second fragment. It is always a good practice to use bundle for passing data.
I hope the following changes should fix your problem, but that's not the best way to do it.
Declare your TextView next to newData
public static final String TAG = "DATA";
public static final String SAVE = "NBHJB";
String newdata = "";
TextView randomData;
Initialize it in onCreateView()
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (savedInstanceState != null)
savedInstanceState.getInt(SAVE);
View rootView = inflater.inflate(R.layout.second_fragment, container, false);
randomData = (TextView) rootView.findViewById(R.id.txtView1);
return rootView;
}
Change the updateDisplay function
public void updateDisplay(String data) {
newdata = data;
randomData.setText(newdata);
}
Make sure you dont have any other items with same id as txtView1.

Here is the solution to everyone who might be facing the same issue:
public static String makeFragmentName(int containerViewId, long id) {
return "android:switcher:" + containerViewId + ":" + id;
}
public #Nullable
Fragment getFragmentForPosition(int position)
{
String tag = makeFragmentName(pager.getId(), position);
Fragment fragment = getSupportFragmentManager().findFragmentByTag(tag);
return fragment;
}
#Override
public void OnEditText(String data) {
Tab2 tab2 = (Tab2)getFragmentForPosition(1);
tab2.updateDisplay(data);
}
This code goes to MainActivity.java