Fragment gave me a white screen

Fragment gave me a white screen - java

I have built an app, which inclues an activity with two fragments. The top fragment is supposed to get two pieces of information (name and age) and insert them into a TextView in the bottom fragment. However, when I run the app, I get a white screen. Logcat shows no errors.
I added the xml files maybe the problem is there.
public class userActivity extends AppCompatActivity implements TopSectionFragment.TopSectionListener {
#Override
public void createName(String name, int age) {
BottomFragment bottomFragment= (BottomFragment)getSupportFragmentManager().findFragmentById(R.id.fragment2);
bottomFragment.setName(name,age);
}
public class TopSectionFragment extends Fragment {
private static EditText name,age;
TopSectionListener activityCommander;
public interface TopSectionListener {
public void createName(String name,int age);
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
try {
activityCommander=(TopSectionListener)context;
}catch (ClassCastException e){
throw new ClassCastException(context.toString());
}
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.top_section_fragment,container,false);
name= (EditText)view.findViewById(R.id.name);
age = (EditText)view.findViewById(R.id.age);
final Button save = (Button) view.findViewById(R.id.save);
save.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
saveClicked(v);
}
}
);
return view;
}
public void saveClicked(View view) {
activityCommander.createName(name.getText().toString(),Integer.getInteger(age.getText().toString()));
}
}
public class BottomFragment extends Fragment {
private static TextView list;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view= inflater.inflate(R.layout.bottom_fragment,container,false);
list = (TextView)view.findViewById(R.id.list);
return view;
}
public void setName(String name,int age){
list.setText(name + " " + age);
}
}
activity-
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
android:background="#FF4F87BC"
tools:context="com.example.student.familycommitment.userActivity">
<fragment
android:id="#+id/fragment"
android:name="com.example.student.familycommitment.TopSectionFragment"
android:layout_width="match_parent"
android:layout_height="336dp"
tools:layout="#layout/top_section_fragment" />
<fragment
android:id="#+id/fragment2"
android:name="com.example.student.familycommitment.userList$BottomFragment"
android:layout_width="match_parent"
android:layout_height="392dp"
tools:layout="#layout/bottom_fragment" />
</LinearLayout>
bottom-
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
android:orientation="vertical"
android:background="#FF4F87BC"
tools:context="com.example.student.familycommitment.userActivity">
<TextView
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="228dp"
android:layout_marginTop="450dp"
android:fontFamily="serif"
android:gravity="start"
android:textColor="#FFFF"
android:textSize="20sp"></TextView>
</RelativeLayout>
top-
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
android:background="#FF4F87BC"
tools:context="com.example.student.familycommitment.userActivity">
<TextView
android:id="#+id/user"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:gravity="center_horizontal"
android:text="Please enter your children's names and ages"
android:textColor="#FFFF"
android:fontFamily="sans-serif-black"
android:textSize="30sp"></TextView>
<EditText
android:layout_width="200dp"
android:layout_height="50dp"
android:id="#+id/name"
android:hint="Name"
android:layout_gravity="center"
android:layout_marginTop="30dp"
android:textSize="25sp"
android:background="#android:drawable/editbox_background_normal"
/>
<EditText
android:layout_width="200dp"
android:layout_height="50dp"
android:id="#+id/age"
android:hint="age"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:textSize="25sp"
android:background="#android:drawable/editbox_background_normal"
/>
<Button
android:id="#+id/save"
android:layout_width="134dp"
android:layout_height="34dp"
android:layout_gravity="center"
android:layout_marginTop="20dp"
android:background="#android:drawable/editbox_dropdown_dark_frame"
android:fontFamily="monospace"
android:gravity="center_horizontal"
android:text="save"
android:textColor="#FFFF"
android:textSize="20sp" />
</LinearLayout>

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Create the Recycler view with fixed item count in horizontal scroll

Please help Me,
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Please tell me if that is possible or not.
my code of xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="100dp"
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android:layout_margin="6dp"
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android:layout_width="match_parent"
android:layout_height="85dp"
android:scaleType="fitCenter"
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android:layout_margin="10dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="15dp"
android:gravity="center"
>
<TextView
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android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:background="#drawable/pinkcurvedbtn"
android:gravity="center"
android:padding="3dp"
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android:textColor="#color/white"
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<LinearLayout
android:layout_below="#id/image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_margin="8dp"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_gravity="center"
android:gravity="center"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textStyle="normal"
android:layout_margin="6dp"
android:layout_gravity="center"
android:textSize="10sp"
android:textColor="#color/black"
android:text="Pest control">
</TextView>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#color/grey"></View>
<TextView
android:layout_margin="8dp"
android:id="#+id/shopname"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="10dp"
android:textStyle="bold"
android:textColor="#color/black"
android:text="K02BgbhdAf">
</TextView>
<TextView
android:visibility="gone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableLeft="#drawable/graylocation"
android:text="Airport Road"
android:id="#+id/address"
android:textSize="18sp"
android:textStyle="normal">
</TextView>
</LinearLayout>
</LinearLayout>
</RelativeLayout>
This is my Adapter code
public class OurrecomendedAdapter extends RecyclerView.Adapter<OurrecomendedAdapter.MyViewHolder> {
private List<HomeResponse.Recommend> ourrecomendedlist = new ArrayList<>();
private Context context;
public static int recomendedid=0;
public OurrecomendedAdapter(List<HomeResponse.Recommend> list, Context context) {
this.ourrecomendedlist = list;
this.context = context;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.recomemdedservices_item, parent, false);
// itemView.setLayoutParams(new ViewGroup.LayoutParams((int) (parent.getWidth() * 0.3),ViewGroup.LayoutParams.MATCH_PARENT));
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(MyViewHolder holder, #SuppressLint("RecyclerView") int position) {
holder.title.setText(ourrecomendedlist.get(position).getCategory().getSlug());
holder.shopname.setText(ourrecomendedlist.get(position).getCategory().getName());
Picasso.get().load(ourrecomendedlist.get(position).getImage()).into(holder.image, new Callback() {
#Override
public void onSuccess() {
}
#Override
public void onError(Exception e) {
}
});
holder.recomended.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(ourrecomendedlist.get(position).getCategory().getName().toString().equalsIgnoreCase("salon for women") || ourrecomendedlist.get(position).getCategory().getName().toString().equalsIgnoreCase("salon for men")){
AppCompatActivity activity = (AppCompatActivity) context;
WomensalonlistFragment subc = new WomensalonlistFragment();
Bundle args = new Bundle();
args.putString("id", ourrecomendedlist.get(position).getProductcategoryId().toString());
args.putString("title", ourrecomendedlist.get(position).getName());
subc.setArguments(args);
activity.getSupportFragmentManager().beginTransaction().addToBackStack(null).
replace(R.id.nav_host_fragment, subc).commit();
}
else
{
typeListid= ourrecomendedlist.get(position).getId().toString();
Intent intent= new Intent(context, ProductdetailsActivity.class);
intent.putExtra("productId",typeListid);
context.startActivity(intent);
HomeFragment.vendormainid=ourrecomendedlist.get(position).getId().toString();
}
}
});
}
#Override
public int getItemCount() {
return this.ourrecomendedlist.size();
}
class MyViewHolder extends RecyclerView.ViewHolder {
TextView name,title,shopname,address,pinkbtn;
Button addtocart;
ImageView image;
RelativeLayout recomended;
MyViewHolder(View itemView) {
super(itemView);
addtocart=itemView.findViewById(R.id.addtocart);
image=itemView.findViewById(R.id.image);
title=itemView.findViewById(R.id.title);
shopname=itemView.findViewById(R.id.shopname);
address=itemView.findViewById(R.id.address);
recomended=itemView.findViewById(R.id.recomended);
name=itemView.findViewById(R.id.name);
pinkbtn=itemView.findViewById(R.id.pinkbtn);
}
}
}
in this i need to display our output as 3 items in each aspect-ratio mobile.
but I'm unable to achieve that. If I'm opening in big screen mobile then it's showing 3.5 items and in small device some times it's showing 2.75 items.
Kindly help me in that how to achieve that exact output.

bottom navigation data is not displaying using recyclerview using cardview

Hi in the below code I am working with bottom navigation it contains different option in that one thing is account .If click on the account bottom tab want to display the cardview in recyclerviews
But data is not coming anything. It is displaying empty.
using this below xml to display the content in listview format
accounts.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.support.v7.widget.RecyclerView
android:id="#+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
Fragment_account.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginTop="20dp"
android:background="#color/White">
<android.support.v7.widget.CardView
android:id="#+id/cardView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
app:cardBackgroundColor="#color/slivergray"
app:cardCornerRadius="8dp"
app:cardElevation="4dp"
app:cardUseCompatPadding="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#color/White">
<ImageView
android:id="#+id/appImage"
android:layout_width="72dp"
android:layout_height="72dp"
android:layout_marginLeft="16dp"
android:background="#drawable/ic_account_circle_black_24dp"
android:backgroundTint="#color/gray"
android:scaleType="centerCrop"
tools:ignore="ContentDescription"/>
<TextView
android:id="#+id/headingText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/appImage"
android:paddingLeft="16sp"
android:paddingRight="16dp"
android:text="Apollo Hospital"
android:textColor="#color/black"
android:textSize="18sp"
tools:ignore="RtlHardcoded"/>
<TextView
android:id="#+id/subHeaderText"
style="#style/Base.TextAppearance.AppCompat.Subhead"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/headingText"
android:layout_toRightOf="#+id/appImage"
android:paddingLeft="16dp"
android:text="Hospital"
android:paddingRight="16dp"
android:textColor="#color/gray"
android:textSize="15sp"/>
<TextView
android:id="#+id/subHeadingText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/subHeaderText"
android:layout_toRightOf="#+id/appImage"
android:gravity="left"
android:lines="5"
android:maxLines="5"
android:paddingBottom="16dp"
android:paddingLeft="16dp"
android:paddingTop="16dp"
android:paddingRight="16dp"
android:text="stories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detailstories_detail"
android:textColor="#color/gray"
android:textSize="14sp"/>
<TextView
android:id="#+id/textViewOptions"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:text="⋮"
android:textColor="#color/gray"
android:layout_marginRight="10dp"
android:textAppearance="?android:textAppearanceLarge"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_below="#id/subHeadingText">
<LinearLayout
android:layout_width="209dp"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:layout_marginLeft="30dp"
android:orientation="horizontal">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:backgroundTint="#color/gray"
android:src="#drawable/ic_account_circle_black_24dp"></ImageView>
<Button
android:id="#+id/action1"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Action 1"
android:textColor="#color/gray"
android:textSize="14sp"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_gravity="right">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:src="#drawable/ic_account_circle_black_24dp"
android:layout_marginLeft="50dp"></ImageView>
<Button
android:id="#+id/action2"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Action 2"
android:textColor="#color/gray"
android:textSize="14sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
</RelativeLayout>
AccountFragment.java:
public class AccountFragement extends Fragment {
public AccountFragement(){
}
RecyclerView rv;
private List<List_Data> list_data;
private MyAdapter adapter;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate (R.layout.account, container, false);
rv=(RecyclerView) rootView.findViewById(R.id.recyclerview);
//rv.setHasFixedSize(true);
rv.setLayoutManager(new LinearLayoutManager(getContext()));
list_data=new ArrayList<>();
adapter=new MyAdapter(list_data,getContext());
rv.setAdapter(adapter);
return rootView;
}
private void setupData(List<List_Data> list_data) {
adapter=new MyAdapter(list_data,getContext());
rv.setAdapter(adapter);
}
}
List_Data.java:
public class List_Data {
String title;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
MyAdapter.java:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private List<List_Data>list_data;
private Context context;
private String title1;
public MyAdapter(List<List_Data> list_data, Context context) {
this.list_data = list_data;
this.context = context;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.fragment_account,parent,false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
List_Data listData=list_data.get(position);
// title1=list_data.get(0).getTitle();
holder.title.setText(listData.getTitle());
}
#Override
public int getItemCount() {
return list_data.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
ImageView img;
TextView title,subtile;
public ViewHolder(View itemView) {
super(itemView);
title=(TextView)itemView.findViewById(R.id.headingText);
subtile=(TextView)itemView.findViewById(R.id.subHeaderText);
title.setText(title1);
}
}
}

the code you have written is somehow incomplete, first you can not view any data because there are no data in the List list_data in the AccountFragment so the adapter is does not know where to fetch data from.
When you have data in the list then you can populate to the adapter.
I recommend you follow the best approach from the link below in case you have any problem please do let us know.
https://www.androidhive.info/2017/12/android-working-with-bottom-navigation/
And try your best to start using AndroidX in your project

Items get mixed up when changing xml attributes using the adapter class in recycle view in android

I have an adapter class which loads items dynamically and shows them in a RecyclerView. My problem is that when I swipe up and down the recycler view the images get mixed and are shown in wrong positions (i.e. in other item's view).
For example, I have an item X and another item Y. Now when I swipe up and down the image which was to be shown in item Y get shown in item X and the same happens with other attributes.
Here is my adapter class:
public class NewsAdapter extends RecyclerView.Adapter<NewsAdapter.NewsViewHolder> {
private DatabaseReference refDNewsTable= FirebaseDatabase.getInstance().getReference().child("news_feeds");
private StorageReference refStorage = FirebaseStorage.getInstance().getReferenceFromUrl("firebase_url_comes_here");
private Context mContext;
private List<NewsModel> newsList;
public class NewsViewHolder extends RecyclerView.ViewHolder {
public TextView nHeading, nDes,nDaTi;
public ImageView nImg;
public NewsViewHolder(View view) {
super(view);
nHeading = (TextView) view.findViewById(R.id.tv_newsHeadline);
nDes = (TextView) view.findViewById(R.id.tv_nDes);
nImg = (ImageView) view.findViewById(R.id.iv_nImg);
nDaTi=(TextView) view.findViewById(R.id.tv_nDaTi);
}
}
public NewsAdapter(Context mContext, List<NewsModel> newsList) {
this.mContext = mContext;
this.newsList = newsList;
}
#Override
public NewsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.news_model, parent, false);
return new NewsViewHolder(itemView);
}
#Override
public void onBindViewHolder(final NewsViewHolder holder, int position) {
NewsModel news = newsList.get(position);
holder.nHeading.setText(news.getnHeading());
if(news.hasDes()) {
holder.nDes.setText(news.getnDes());
}else{
holder.nDes.setVisibility(View.GONE);
}
if(news.hasImg()){
// Reference to an image file in Firebase Storage
StorageReference imgReference =refStorage.child(news.getnId());
// Load the image using Glide
Glide.with(mContext)
.using(new FirebaseImageLoader())
.load(imgReference)
.into(holder.nImg);
}else{
holder.nImg.setVisibility(View.GONE);
}
holder.nDaTi.setText(news.getnDaTi());
}
public void downloadFile(final NewsViewHolder holder){
try {
final File localFile = File.createTempFile("images", "jpg");
refStorage.getFile(localFile).addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() {
#Override
public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {
Bitmap bitmap = BitmapFactory.decodeFile(localFile.getAbsolutePath());
holder.nImg.setImageBitmap(bitmap);
}
}).addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception exception) {
}
});
} catch (IOException e ) {}
}
#Override
public int getItemCount() {
return newsList.size();
}
}
And this is my news_model.xml file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:padding="10dp"
android:layout_margin="4dp"
card_view:cardPreventCornerOverlap="true"
card_view:cardElevation="16dp"
android:layout_height="wrap_content"
android:id="#+id/card_view"
android:layout_gravity="center"
card_view:cardCornerRadius="0dp">
<LinearLayout
android:orientation="vertical"
android:background="#color/cBgNews"
android:padding="0dp"
android:gravity="center_horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:padding="10dp"
card_view:cardElevation="6dp"
card_view:cardBackgroundColor="#color/cNewsHeadline"
android:layout_height="wrap_content"
android:layout_marginTop="0dp"
android:layout_marginStart="10dp"
android:layout_marginEnd="10dp"
android:layout_marginBottom="0dp"
android:id="#+id/card_des"
android:layout_gravity="center"
card_view:cardCornerRadius="0dp">
<TextView
android:text="TextView"
android:textSize="17sp"
android:textStyle="normal"
android:padding="10dp"
android:maxLines="3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#color/cWhite"
android:gravity="start"
android:layout_margin="0dp"
android:id="#+id/tv_newsHeadline" />
</android.support.v7.widget.CardView>
<LinearLayout
android:orientation="vertical"
android:gravity="center_horizontal"
android:background="#0000"
android:paddingEnd="6dp"
android:paddingStart="6dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_width="wrap_content"
android:layout_marginBottom="0dp"
android:layout_height="wrap_content"
android:maxHeight="300dp"
app:srcCompat="#mipmap/ic_launcher"
android:scaleType="fitCenter"
android:layout_gravity="center_horizontal"
android:id="#+id/iv_nImg" />
<TextView
android:text="Description..."
android:maxLines="8"
android:textSize="16sp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ellipsize="end"
android:padding="10dp"
android:textColor="#color/cBlack"
android:id="#+id/tv_nDes" />
<TextView
android:text="Date and Time"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="10sp"
android:textColor="#999999"
android:gravity="end"
android:id="#+id/tv_nDaTi" />
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
NOTE: I am using firebase to receive the content directly and haven't created any kind of database in my app yet. i.e. it loads data every time it needs it directly in adapter class.

Can't get Admob to show on multiple layouts?

I am trying to get Admob to display on my layout_one.xml and layout_two and can't get it to show. This app has a lot of swipe left and right and I want to display one ad over both layouts
Here are all my xml layouts:
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/pager">
</android.support.v4.view.ViewPager>
layout_one.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="#+id/relative_one"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
android:focusable="true"
android:focusableInTouchMode="true"
android:orientation="vertical">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Copy"
android:id="#+id/Copy"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:layout_alignParentEnd="false"
android:layout_alignParentStart="false"
android:textSize="30sp"
android:onClick="onClickCopy"/>
<EditText
android:layout_width="300dp"
android:layout_height="50dp"
android:id="#+id/stringCopy"
android:layout_above="#+id/Copy"
android:layout_centerHorizontal="true"
android:layout_marginBottom="70dp"
android:textSize="30sp"
android:inputType="text"
android:gravity="left|top"
android:background="#ffffff" />
<com.google.android.gms.ads.AdView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
ads:adSize="BANNER"
ads:adUnitId="#string/banner_ad_unit_id"/>
layout_two.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/relative_one"
android:background="#000000"
android:focusable="true"
android:focusableInTouchMode="true"
android:orientation="vertical">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Paste"
android:id="#+id/Paste"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:layout_alignParentEnd="false"
android:layout_alignParentStart="false"
android:textSize="30sp"
android:onClick="onClickPaste"/>
<EditText
android:layout_width="300dp"
android:layout_height="50dp"
android:id="#+id/stringCopy"
android:layout_marginBottom="71dp"
android:textSize="30sp"
android:inputType="text"
android:gravity="left|top"
android:background="#ffffff"
android:layout_above="#+id/Paste"
android:layout_centerHorizontal="true" />
<!-- SHOULD I PUT ANOTHER ADVIEW IN THIS XML -->
</RelativeLayout>
Here is all my java classes:
MainActivity.java
public class MainActivity extends FragmentActivity {
//View Pager
ViewPager viewpager;
//AdView
AdView adView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewpager = (ViewPager)findViewById(R.id.pager);
PagerAdapter pAdapter = new PagerAdapter(getSupportFragmentManager());
viewpager.setAdapter(pAdapter);
}
public void onClickCopy(View v)
{
//Copy Text From layout_one to Clipboard
}
public void onClickPaste(View v)
{
//Paste Text From Clipboard
}
}
PagerAdapter.java
public class PagerAdapter extends FragmentPagerAdapter {
public PagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int arg0) {
switch (arg0) {
case 0:
return new FragmentOne();
case 1:
return new FragmentTwo();
default:
break;
}
return null;
}
#Override
public int getCount() {
return 2;
}
}
FragmentOne.java
public class FragmentOne extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.layout_one, container, false);
}
}
FragmentTwo.java
public class FragmentTwo extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.layout_two, container, false);
}
}
Where would I put this code so that when they swipe between layout_one and layout_two that the same ad will be displayed and not make a new ad request every time they change views?
//Display test Ads
adView = new AdView(this);
AdRequest request = new AdRequest.Builder()
.addTestDevice("DEVICE_ID").build();
adView.loadAd(request);

The standard pattern for doing this is to put your AdView either above or below your ViewPager and keep it static. That way you are not constantly requesting ads that you never get time to display.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
>
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:id="#+id/pager">
</android.support.v4.view.ViewPager>
<com.google.android.gms.ads.AdView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0"
android:adUnitId="yourAdUnitId"
android:id="#+id/adView">
</LinearLayout>
This way your Adview is outside your ViewPager and remains constant across all pages.

I use the following code to cache Admob in scroll Grid View:
public View getView(int position, View convertView, ViewGroup parent) {
if (position != adNum) {
...
} else {
if (mAdView == null) {
frameLayout = new FrameLayout(mContext);
mAdView = new AdView(mContext);
...
frameLayout.addView(mAdView);
} else {
frameLayout.removeView(mAdView);
frameLayout = new FrameLayout(mContext);
frameLayout.addView(mAdView);
}
return frameLayout;
}
}

android null object reference, despite being present

I have an MainActivity that basically has a framelayout that has different fragments sitting it in depending on what the user is doing.
activity_main.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:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
android:orientation="vertical" tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#27b"
android:layout_weight=".04">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/activity_main_framelayout">
</FrameLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight=".9"
android:orientation="horizontal">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#1B5F96"
android:layout_weight=".9"
android:id="#+id/activity_main_status_title"
android:text="#string/activity_main_status_title"
tools:ignore="NestedWeights" />
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#AD3333"
android:layout_weight=".15"
android:id="#+id/activity_main_status_value"
android:text="#string/activity_main_status_value"/>
</LinearLayout>
</LinearLayout>
The problem starts with an interface method void WillYouAccept(final String caller)
#Override
public void WillYouAccept(final String caller) {
Connection f = new Connection();
ShiftView(f);
runOnUiThread(new Runnable() {
#Override
public void run() {
Connection b = (Connection) getFragmentManager().findFragmentById(R.layout.connection_display);
b.updateInitiator(caller);
}
});
}
The line b.updateInitiator(caller); is what initiates the null object reference error. ShiftView has basically been swapping out fragments into the framelayout for me, and so far has worked well.
#Override
public void ShiftView(Object obj) {
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.activity_main_framelayout, (Fragment) obj);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
ft.addToBackStack(null);
ft.commit();
}
Basically a textview in connection_display.xml(Connection.java) needs to be updated from the MainActivity, and somehow initiator = (TextView) view.findViewById(R.id.textView_connection_display_initiator_ID); is null when it is being interacted with from MainActivity.
Connection.java
package "";
import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
public class Connection extends Fragment {
MiddleMan mCallBack;
Button accept;
Button deny;
TextView initiator;
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallBack = (MiddleMan) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString() + " must implement ReqestConnect");
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.connection_display, container, false);
mCallBack.DisplayHome();
initiator = (TextView) view.findViewById(R.id.textView_connection_display_initiator_ID);
accept = (Button) view.findViewById(R.id.button_connection_display_ACCEPT);
accept.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
buttonAccept();
}
});
deny = (Button) view.findViewById(R.id.button_connection_display_DENY);
deny.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
buttonDeny();
}
});
return view;
}
private void buttonAccept() {
System.out.println("Accept Button Pressed");
}
private void buttonDeny() {
System.out.println("Deny Button Pressed");
}
public void updateInitiator(final String s) {
initiator.setText(s);
}
}
connection_display.xml
<?xml version="1.0" encoding="utf-8"?>
<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">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="#string/textView_connection_display_title"
android:id="#+id/textView_connection_display_title" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:orientation="horizontal"
android:layout_marginTop="45dp"
android:layout_weight=".004">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="65dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="#string/textView_connection_display_ID_label"
android:id="#+id/textView_connection_display_ID_label" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="#+id/textView_connection_display_initiator_ID"
android:text="#string/textView_connection_display_initiator_ID" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:orientation="horizontal"
android:layout_weight=".004">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="#string/textView_connection_display_exp"
android:id="#+id/textView_connection_display_exp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:orientation="horizontal"
android:layout_weight=".04">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="100dp"
android:text="#string/button_connection_display_ACCEPT"
android:id="#+id/button_connection_display_ACCEPT"
tools:ignore="ButtonStyle" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_connection_display_DENY"
android:id="#+id/button_connection_display_DENY"
tools:ignore="ButtonStyle" />
</LinearLayout>
</LinearLayout>

b was definitely turning up as null, however the bit above had always found the fragment, so I solved it with this:
#Override
public void WillYouAccept(final String caller) {
final Connection f = new Connection();
ShiftView(f);
runOnUiThread(new Runnable() {
#Override
public void run() {
f.updateInitiator(caller);
}
});
}

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Fragment gave me a white screen - java

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