Develop Reference

Can't display weather data using retrofit

I'm trying to display data in my fragment & activity class from a Weather API using retrofit but on running the app, it displays nothing and meanwhile shows no error at runtime. I'm suspecting it will be due to a wrong connection of my retrofit network setup and I have no clue as to where the fault is, I need help, please.
I added Internet Permission in the Manifest
I also tried running the key on my browser online e.g https://api.openweathermap.org/data/2.5/onecall?lat=9.0765&lon=7.3986&exclude=alert,hourly,daily,minutely&appid= and it works but doesn't display data on my app
My codes are below:
FirstFragment.java
public class FirstFragment extends Fragment {
public static String BaseUrl = "http://api.openweathermap.org/";
public static String AppId = "(My App key)";
public static String lat = "9.0574";
public static String lon = "7.4898";
// User current temperature, current condition, sunrise, sunset, temperature, pressure, humidity, wind_speed, visibility, UV Index
TextView current_temp, current_output, rise_time, set_time, temp_out, Press_out, Humid_out, Ws_out, Visi_out, UV_out;
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public FirstFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #param param2 Parameter 2.
* #return A new instance of fragment SecondFragment.
*/
// TODO: Rename and change types and number of parameters
public static FirstFragment newInstance(String param1, String param2) {
FirstFragment fragment = new FirstFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_first, container, false);
current_temp = rootView.findViewById(R.id.textView10);
current_output = rootView.findViewById(R.id.textView11);
rise_time = rootView.findViewById(R.id.textView25);
set_time = rootView.findViewById(R.id.textView26);
temp_out = rootView.findViewById(R.id.textView28);
Press_out = rootView.findViewById(R.id.textView29);
Humid_out = rootView.findViewById(R.id.textView30);
Ws_out = rootView.findViewById(R.id.textView33);
Visi_out = rootView.findViewById(R.id.textView34);
UV_out = rootView.findViewById(R.id.textView35);
Retrofit retrofit = new Retrofit.Builder().baseUrl(BaseUrl).addConverterFactory(GsonConverterFactory.create()).build();
WeatherService service = retrofit.create(WeatherService.class);
Call<WeatherResponse> call = service.getCurrentWeatherData(lat, lon, AppId);
call.enqueue(new Callback<WeatherResponse>() {
#Override
public void onResponse(#NonNull Call<WeatherResponse> call, #NonNull Response<WeatherResponse> response) {
if (response.code() == 200) {
WeatherResponse weatherResponse = response.body();
assert weatherResponse != null;
assert response.body() != null;
current_temp.setText(getString(R.string.blank, response.body().getCurrent().getTemp() + " ℃"));
current_output.setText(response.body().getCurrent().getWeather().get(0).getDescription());
rise_time.setText(getString(R.string.blank, response.body().getCurrent().getSunrise() + " AM"));
set_time.setText(getString(R.string.blank, response.body().getCurrent().getSunset() + " PM"));
temp_out.setText(getString(R.string.blank, response.body().getCurrent().getTemp() + " ℃"));
Press_out.setText(getString(R.string.blank, response.body().getCurrent().getPressure() + " hpa"));
Humid_out.setText(getString(R.string.blank, response.body().getCurrent().getHumidity() + " %"));
Ws_out.setText(getString(R.string.blank, response.body().getCurrent().getWindSpeed() + " Km/h"));
Visi_out.setText(getString(R.string.blank, response.body().getCurrent().getVisibility() + " m"));
}
}
#Override
public void onFailure(#NonNull Call<WeatherResponse> call, #NonNull Throwable t) {
t.printStackTrace();
}
});
return rootView;
}
}
HomeActivity.java
public class HomeActivity extends AppCompatActivity {
public static String BaseUrl = "http://api.openweathermap.org/";
public static String AppId = "(My App key)";
public static String lat = "9.0574";
public static String lon = "7.4898";
// User Timezone name, current time
TextView time_zone, time_field;
ConstraintLayout constraintLayout;
public static int count=0;
int[] drawable =new int[]{R.drawable.dubai,R.drawable.central_bank_of_nigeria,R.drawable.eiffel_tower,R.drawable.hong_kong,R.drawable.statue_of_liberty};
Timer _t;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
time_zone = findViewById(R.id.textView9);
time_field = findViewById(R.id.textView4);
BottomNavigationView bottomNavigationView = findViewById(R.id.bottomNavigationView);
NavController navController = Navigation.findNavController(this, R.id.fragment);
NavigationUI.setupWithNavController(bottomNavigationView, navController);
Retrofit retrofit = new Retrofit.Builder().baseUrl(BaseUrl).addConverterFactory(GsonConverterFactory.create()).build();
WeatherService service = retrofit.create(WeatherService.class);
Call<WeatherResponse> call = service.getCurrentWeatherData(lat, lon, AppId);
call.enqueue(new Callback<WeatherResponse>() {
#Override
public void onResponse(#NonNull Call<WeatherResponse> call, #NonNull Response<WeatherResponse> response) {
if (response.code() == 200) {
WeatherResponse weatherResponse = response.body();
assert weatherResponse != null;
assert response.body() != null;
time_zone.setText(response.body().getTimezone());
time_field.setText(response.body().getCurrent().getDt());
constraintLayout = findViewById(R.id.layout);
constraintLayout.setBackgroundResource(R.drawable.dubai);
_t = new Timer();
_t.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
// run on ui thread
runOnUiThread(() -> {
if (count < drawable.length) {
constraintLayout.setBackgroundResource(drawable[count]);
count = (count + 1) % drawable.length;
}
});
}
}, 5000, 5000);
}
}
#Override
public void onFailure(#NotNull Call<WeatherResponse> call, #NotNull Throwable t) {
}
});
}
}
My Interface
public interface WeatherService {
#GET("data/2.5/weather?")
Call<WeatherResponse> getCurrentWeatherData(#Query("lat") String lat, #Query("lon") String lon, #Query("APPID") String app_id);
}
EDIT
Now it shows java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Integer com.tex.lightweatherforecast.first.Current.getDt()' on a null object reference on runtime after i changed HTTP to https
My Current class:
public class Current {
#SerializedName("dt")
#Expose
private Integer dt;
#SerializedName("sunrise")
#Expose
private Integer sunrise;
#SerializedName("sunset")
#Expose
private Integer sunset;
#SerializedName("temp")
#Expose
private Double temp;
#SerializedName("feels_like")
#Expose
private Double feelsLike;
#SerializedName("pressure")
#Expose
private Integer pressure;
#SerializedName("humidity")
#Expose
private Integer humidity;
#SerializedName("dew_point")
#Expose
private Double dewPoint;
#SerializedName("uvi")
#Expose
private Double uvi;
#SerializedName("clouds")
#Expose
private Integer clouds;
#SerializedName("visibility")
#Expose
private Integer visibility;
#SerializedName("wind_speed")
#Expose
private Double windSpeed;
#SerializedName("wind_deg")
#Expose
private Integer windDeg;
#SerializedName("weather")
#Expose
private List<Weather> weather = null;
public Integer getDt() {
return dt;
}
public void setDt(Integer dt) {
this.dt = dt;
}
public Integer getSunrise() {
return sunrise;
}
public void setSunrise(Integer sunrise) {
this.sunrise = sunrise;
}
public Integer getSunset() {
return sunset;
}
public void setSunset(Integer sunset) {
this.sunset = sunset;
}
public Double getTemp() {
return temp;
}
public void setTemp(Double temp) {
this.temp = temp;
}
public Double getFeelsLike() {
return feelsLike;
}
public void setFeelsLike(Double feelsLike) {
this.feelsLike = feelsLike;
}
public Integer getPressure() {
return pressure;
}
public void setPressure(Integer pressure) {
this.pressure = pressure;
}
public Integer getHumidity() {
return humidity;
}
public void setHumidity(Integer humidity) {
this.humidity = humidity;
}
public Double getDewPoint() {
return dewPoint;
}
public void setDewPoint(Double dewPoint) {
this.dewPoint = dewPoint;
}
public Double getUvi() {
return uvi;
}
public void setUvi(Double uvi) {
this.uvi = uvi;
}
public Integer getClouds() {
return clouds;
}
public void setClouds(Integer clouds) {
this.clouds = clouds;
}
public Integer getVisibility() {
return visibility;
}
public void setVisibility(Integer visibility) {
this.visibility = visibility;
}
public Double getWindSpeed() {
return windSpeed;
}
public void setWindSpeed(Double windSpeed) {
this.windSpeed = windSpeed;
}
public Integer getWindDeg() {
return windDeg;
}
public void setWindDeg(Integer windDeg) {
this.windDeg = windDeg;
}
public List<Weather> getWeather() {
return weather;
}
public void setWeather(List<Weather> weather) {
this.weather = weather;
}
}

I fixed the error by changing the weather? to onecall? in my interface call

How to make my Fragment make use of my Activity Data?

I have an Activity hosting 3 Fragments, my activity contains some data that I want my first fragment to use.
I tried invoking the following method so that the activity can communicate with the fragment:
FirstFragment fragmentFirst = (FirstFragment)
getSupportFragmentManager().findFragmentById(R.id.firstFragment);
assert fragmentFirst != null;
fragmentFirst.doSomething("some param");
For the activity class and:
public void doSomething(String param) {
// do something in fragment
}
For the fragment class, but it brought out an: Attempt to invoke virtual method 'void com.tex.lightweatherforecast.FirstFragment.doSomething(java.lang.String)' on a null object reference
error at runtime.
My Activity code is:
public class HomeActivity extends AppCompatActivity {
public static String BaseUrl = "http://api.openweathermap.org/";
public static String AppId = "9c547bfc852923c3b30d0d62a5ae35e8";
public static String lat = "9.0574";
public static String lon = "7.4898";
// User Timezone name, current time, current temperature, current condition, sunrise, sunset, temperature, pressure, humidity, wind_speed, visibility, UV Index
TextView time_zone, time_field, current_temp, current_output, rise_time, set_time, temp_out, Press_out, Humid_out, Ws_out, Visi_out, UV_out;
ConstraintLayout constraintLayout;
public static int count=0;
int[] drawable =new int[]{R.drawable.dubai,R.drawable.central_bank_of_nigeria,R.drawable.eiffel_tower,R.drawable.hong_kong,R.drawable.statue_of_liberty};
Timer _t;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
FirstFragment fragmentFirst = (FirstFragment)
getSupportFragmentManager().findFragmentById(R.id.firstFragment);
assert fragmentFirst != null;
fragmentFirst.doSomething("some param");
time_zone = findViewById(R.id.textView9);
time_field = findViewById(R.id.textView4);
current_temp = findViewById(R.id.textView10);
current_output = findViewById(R.id.textView11);
rise_time = findViewById(R.id.textView25);
set_time = findViewById(R.id.textView26);
temp_out = findViewById(R.id.textView28);
Press_out = findViewById(R.id.textView29);
Humid_out = findViewById(R.id.textView30);
Ws_out = findViewById(R.id.textView33);
Visi_out = findViewById(R.id.textView34);
UV_out = findViewById(R.id.textView35);
BottomNavigationView bottomNavigationView = findViewById(R.id.bottomNavigationView);
NavController navController = Navigation.findNavController(this, R.id.fragment);
NavigationUI.setupWithNavController(bottomNavigationView, navController);
findViewById(R.id.button2).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
getCurrentData();
constraintLayout = findViewById(R.id.layout);
constraintLayout.setBackgroundResource(R.drawable.dubai);
_t = new Timer();
_t.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
runOnUiThread(new Runnable() { // run on ui thread
#Override
public void run() {
if (count < drawable.length) {
constraintLayout.setBackgroundResource(drawable[count]);
count = (count + 1) % drawable.length;
}
}
});
}
}, 5000, 5000);
}
void getCurrentData() {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(BaseUrl)
.addConverterFactory(GsonConverterFactory.create())
.build();
WeatherService service = retrofit.create(WeatherService.class);
Call<WeatherResponse> call = service.getCurrentWeatherData(lat, lon, AppId);
call.enqueue(new Callback<WeatherResponse>() {
#Override
public void onResponse(#NonNull Call<WeatherResponse> call, #NonNull Response<WeatherResponse> response) {
if (response.code() == 200) {
WeatherResponse weatherResponse = response.body();
assert weatherResponse != null;
assert response.body() != null;
time_zone.setText(response.body().getTimezone());
time_field.setText(response.body().getCurrent().getDt());
current_temp.setText(response.body().getCurrent().getTemp() + " ℃");
current_output.setText(response.body().getCurrent().getWeather().get(0).getDescription());
rise_time.setText(response.body().getCurrent().getSunrise() + " AM");
set_time.setText(response.body().getCurrent().getSunset() + " PM");
temp_out.setText(response.body().getCurrent().getTemp() + " ℃");
Press_out.setText(response.body().getCurrent().getPressure() + " hpa");
Humid_out.setText(response.body().getCurrent().getHumidity() + " %");
Ws_out.setText(response.body().getCurrent().getWindSpeed() + " Km/h");
Visi_out.setText(response.body().getCurrent().getVisibility() + " m");
}
}
#Override
public void onFailure(#NonNull Call<WeatherResponse> call, #NonNull Throwable t) {
}
});
}
});
}
}
Any help will be Appreciated

I think you are getting this error because the fragment is not active. and if it's active and this approach worked, it's pretty bad approach, there are other ways in when we use the new LiveData and ViewModel arch style.
If you think that DataSource(LiveData usually) will be needed by children(Fragments) make this DataSource owned by the Parent (activity) and keep watching that DataSource inside the fragment(i.e. make observers of this LiveData inside different fragments)
If you need to make a callback from the Fragment to the activity use Contracts(Interfaces) and implement that contract inside the activity(this contract might contain functions like doSomething()) and call that from inside the fragment like this:
(((ContractName)activity).doSomething(passData))

If you want to pass activity data in your first destination fragment, avoid setting up graph in activity layout file.
Remove graph implementation from activity layout. And implement it as below in activity's onCreate method.
NavController navController = Navigation.findNavController(this, R.id.nav_controller);
Bundle bundle = new Bundle();
bundle.putString("key", "value");
navController.setGraph(navController.getGraph(), bundle);
Update your graph file by referring below code.
<navigation 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:id="#+id/navigation_graph"
app:startDestination="#id/homeFragment">
<fragment android:id="#+id/homeFragment"
android:name="com.java.HomeFragment"
android:label="home_fragment"
tools:layout="#layout/fragment_home">
<argument
android:name="key"
app:argType="string"/>
</fragment>
...
...
</navigation>
In your home fragment, get arguments value.
String data = getArguments().getString("key");

How to Call my Fragment's TextViews and Button from my Activity?

To start with, I'm still new to Android development, I've asked similar questions here before How to make my Fragment make use of my Activity Data? and How to send data from Activity to Fragment?(Android)
But it seems that most people did not quite understand what I mean, so let me explain better.
Suppose I have a TextView:
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="#string/current"
android:textColor="#FF3D19"
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
and a Button:
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="14dp"
android:layout_marginTop="92dp"
android:shadowColor="#FFFFFF"
android:text="Click"
android:textColor="#FF5722"
app:layout_constraintStart_toStartOf="#+id/imageView3"
app:layout_constraintTop_toTopOf="#+id/imageView3" />
in my FirstFragment layout.xml, then i want to call them from my MainActivity i.e current_temp = findViewById(R.id.textView10); to get data i.e current_temp.setText(getString(R.string.blank, response.body().getCurrent().getTemp() + " ℃")); from a weather API and findViewById(R.id.button2).setOnClickListener(new View.OnClickListener() {.
Android Studio will not allow you to just use them like that, so i get this error:
java.lang.NullPointerException: Attempt to invoke virtual method 'void
android.view.View.setOnClickListener(android.view.View$OnClickListener)'
on a null object reference
whenever I run the app. I don't get any other error before running, so the reason is that I've not instantiated any method or maybe callback or interface that will tell the Activity to make use of my fragment's TextViews and Button. So that's what I've been stuck with for days trying to fix, but most people just misunderstood me and started suggesting I should learn ViewModel or LiveData. I watched several tutorials on ViewModel including Codinginflow, they never talked about linking activity to fragment TextViews, they only made a fragment send data to another fragment which is not what I want.
My request is similar to this Android: Can't update textview in Fragment from Activity. NullPointerException tried and failed, So I need step by step procedures on how to apply it.
Full Code:
HomeActivity
public class HomeActivity extends AppCompatActivity {
public static String BaseUrl = "http://api.openweathermap.org/";
public static String AppId = "";
public static String lat = "9.0574";
public static String lon = "7.4898";
// User Timezone name, current time, current temperature, current condition, sunrise, sunset, temperature, pressure, humidity, wind_speed, visibility, UV Index
TextView time_zone, time_field, current_temp, current_output, rise_time, set_time, temp_out, Press_out, Humid_out, Ws_out, Visi_out, UV_out;
ConstraintLayout constraintLayout;
public static int count = 0;
int[] drawable = new int[]{R.drawable.dubai, R.drawable.central_bank_of_nigeria, R.drawable.eiffel_tower, R.drawable.hong_kong, R.drawable.statue_of_liberty};
Timer _t;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
time_zone = findViewById(R.id.textView9);
time_field = findViewById(R.id.textView4);
current_temp = findViewById(R.id.textView10);
current_output = findViewById(R.id.textView11);
rise_time = findViewById(R.id.textView25);
set_time = findViewById(R.id.textView26);
temp_out = findViewById(R.id.textView28);
Press_out = findViewById(R.id.textView29);
Humid_out = findViewById(R.id.textView30);
Ws_out = findViewById(R.id.textView33);
Visi_out = findViewById(R.id.textView34);
UV_out = findViewById(R.id.textView35);
BottomNavigationView bottomNavigationView = findViewById(R.id.bottomNavigationView);
NavController navController = Navigation.findNavController(this, R.id.fragment);
NavigationUI.setupWithNavController(bottomNavigationView, navController);
findViewById(R.id.button2).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
getCurrentData();
constraintLayout = findViewById(R.id.layout);
constraintLayout.setBackgroundResource(R.drawable.dubai);
_t = new Timer();
_t.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
runOnUiThread(new Runnable() { // run on ui thread
#Override
public void run() {
if (count < drawable.length) {
constraintLayout.setBackgroundResource(drawable[count]);
count = (count + 1) % drawable.length;
}
}
});
}
}, 5000, 5000);
}
void getCurrentData() {
Retrofit retrofit = new Retrofit.Builder().baseUrl(BaseUrl).addConverterFactory(GsonConverterFactory.create()).build();
WeatherService service = retrofit.create(WeatherService.class);
Call<WeatherResponse> call = service.getCurrentWeatherData(lat, lon, AppId);
call.enqueue(new Callback<WeatherResponse>() {
#Override
public void onResponse(#NonNull Call<WeatherResponse> call, #NonNull Response<WeatherResponse> response) {
if (response.code() == 200) {
WeatherResponse weatherResponse = response.body();
assert weatherResponse != null;
assert response.body() != null;
time_zone.setText(response.body().getTimezone());
time_field.setText(response.body().getCurrent().getDt());
current_temp.setText(getString(R.string.blank, response.body().getCurrent().getTemp() + " ℃"));
current_output.setText(response.body().getCurrent().getWeather().get(0).getDescription());
rise_time.setText(getString(R.string.blank, response.body().getCurrent().getSunrise() + " AM"));
set_time.setText(getString(R.string.blank, response.body().getCurrent().getSunset() + " PM"));
temp_out.setText(getString(R.string.blank, response.body().getCurrent().getTemp() + " ℃"));
Press_out.setText(getString(R.string.blank, response.body().getCurrent().getPressure() + " hpa"));
Humid_out.setText(getString(R.string.blank, response.body().getCurrent().getHumidity() + " %"));
Ws_out.setText(getString(R.string.blank, response.body().getCurrent().getWindSpeed() + " Km/h"));
Visi_out.setText(getString(R.string.blank, response.body().getCurrent().getVisibility() + " m"));
}
}
#Override
public void onFailure(#NonNull Call<WeatherResponse> call, #NonNull Throwable t) {
}
});
}
});
}
}
FirstFragment
public class FirstFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public FirstFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #param param2 Parameter 2.
* #return A new instance of fragment SecondFragment.
*/
// TODO: Rename and change types and number of parameters
public static FirstFragment newInstance(String param1, String param2) {
FirstFragment fragment = new FirstFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_first, container, false);
}
}
Taking the whole functionality to Fragment won't work too, because retrofit can only be called from Activity. But if you have any solid suggestions, I'll appreciate it.

I suggest you two ways can update data to Text View of Fragment from Activity.
1. Call method update Text View of fragment from Activity (simple way)
Create a method updateData()in fragment class to update data to Text View.
You declare a fragment parameter in activity class and assign to this parameter when add fragment to activity.
When you receive data from api in activity, call fragment.updateData()
fragment_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/temp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:text="TextView"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/hud"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:text="TextView"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/temp" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
home_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
FirstFragment.kt
class FirstFragment : Fragment(R.layout.fragment_layout) {
private lateinit var temp: TextView
private lateinit var hud: TextView
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
temp = view.findViewById(R.id.temp)
hud = view.findViewById(R.id.hud)
}
fun setDataToView(data: WeatherResponse) {
temp.text = data.temp
hud.text = data.hud
}
}
HomeActivity.kt
class HomeActivity: AppCompatActivity() {
private val fragment = FirstFragment()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.home_activity)
addFragment()
fragment.view?.findViewById<Button>(R.id.button2)?.setOnClickListener {
getCurrentData()
}
}
private fun addFragment(){
val fm = supportFragmentManager
fm.beginTransaction().replace(R.id.container, fragment, "FirstFragment").commit()
}
private fun getCurrentData(){
//Your retrofit code in here. I only show code in onResponse()
//.....
#Override
public void onResponse(#NonNull Call<WeatherResponse> call, #NonNull Response<WeatherResponse> response) {
if (response.code() == 200) {
fragment.setDataToView(response)
}
}
//....
}
}
2. Using ViewModel
Create a SharedViewModel class with a livedata parameter.
In activity, on onCreate() you create a SharedViewModel paramerter like below:
SharedViewModel viewModel = new SharedViewModel(this).get(SharedViewModel .class);
In fragment, on onActivityCreated() you create a SharedViewModel paramerter like below:
SharedViewModel viewModel = new SharedViewModel(requireActivity()).get(SharedViewModel .class);
Finally, you have same ViewModel instance in activity and fragment because both using activity context. When you receive data from api, update your livedata parameter in activity, fragment also receives livedata parameter onChanged event and then you can update Text View.

There are many ways to achieve what you are tying to do, I will be using RxJava.
Add RxJava in your project:
implementation 'io.reactivex.rxjava3:rxandroid:3.0.0'
Create a POJO class to hold your data which then later can be transferred using RxJava bus
public class WeatherReport {
private String time_zone;
private String time_field;
private String current_temp;
private String current_output;
private String rise_time;
private String set_time;
private String temp_out;
private String Press_out;
private String Humid_out;
private String Ws_out;
private String Visi_out;
public String getCurrent_output() {
return current_output;
}
public String getCurrent_temp() {
return current_temp;
}
public String getHumid_out() {
return Humid_out;
}
public String getPress_out() {
return Press_out;
}
public String getRise_time() {
return rise_time;
}
public String getSet_time() {
return set_time;
}
public String getTemp_out() {
return temp_out;
}
public String getTime_field() {
return time_field;
}
public String getTime_zone() {
return time_zone;
}
public String getVisi_out() {
return Visi_out;
}
public String getWs_out() {
return Ws_out;
}
public void setCurrent_output(String current_output) {
this.current_output = current_output;
}
public void setCurrent_temp(String current_temp) {
this.current_temp = current_temp;
}
public void setHumid_out(String humid_out) {
Humid_out = humid_out;
}
public void setPress_out(String press_out) {
Press_out = press_out;
}
public void setRise_time(String rise_time) {
this.rise_time = rise_time;
}
public void setSet_time(String set_time) {
this.set_time = set_time;
}
public void setTemp_out(String temp_out) {
this.temp_out = temp_out;
}
public void setTime_field(String time_field) {
this.time_field = time_field;
}
public void setTime_zone(String time_zone) {
this.time_zone = time_zone;
}
public void setVisi_out(String visi_out) {
Visi_out = visi_out;
}
public void setWs_out(String ws_out) {
Ws_out = ws_out;
}
}
Create a RxJava bus
import io.reactivex.rxjava3.subjects.BehaviorSubject;
public class RxJavaBus {
private static final BehaviorSubject<WeatherReport> behaviorSubject
= BehaviorSubject.create();
public static BehaviorSubject<WeatherReport> getSubject() {
return behaviorSubject;
}
}
Now from your activity(or from wherever you want to transfer data) use RxBus like this:
WeatherReport weatherReport = new WeatherReport();
weatherReport.setCurrent_output("Some DATA");
weatherReport.setCurrent_temp("Some DATA");
weatherReport.setHumid_out("Some DATA");
weatherReport.setPress_out("Some DATA");
weatherReport.setRise_time("Some DATA");
weatherReport.setSet_time("Some DATA");
weatherReport.setTime_field("Some DATA");
weatherReport.setVisi_out("Some DATA");
weatherReport.setTemp_out("Some DATA");
weatherReport.setWs_out("Some DATA");
weatherReport.setTime_zone("some DATA");
RxJavaBus.getSubject().onNext(weatherReport);
Now you receive your data in your fragment (or wherever you want) like this:
RxJavaBus.getSubject().subscribe(weatherReportFromActivity -> {
weatherReportFromActivity.getCurrent_output();
weatherReportFromActivity.getCurrent_temp();
weatherReportFromActivity.getHumid_out();
weatherReportFromActivity.getPress_out();
weatherReportFromActivity.getRise_time();
weatherReportFromActivity.getSet_time();
weatherReportFromActivity.getWs_out();
weatherReportFromActivity.getTime_zone();
weatherReportFromActivity.getVisi_out();
weatherReportFromActivity.getTime_field();
weatherReportFromActivity.getTemp_out();
});

You're getting a NullPointerException because findViewById(R.id.button2) returns null.
You need to use the fragment's view as the root. The activity.findViewById(...) call uses the activity's view as the root - it's searching activity_home.xml, which doesn't have button2. You can access the fragment's version with fragment.getView().findViewById(R.id._), BUT:
You need to make sure that the fragment has at finished its onCreateView() step in the life cycle. So it has to be launched and inflated. Otherwise, again, the button doesn't exist.
You can make sure your setup is called at the right time and with the view by making it a callback in the fragment life cycle.
//This class can be anywhere - it can be global, private inner, anonymous
class SetupCallback extends FragmentLifeCycleCallback {
#Override
void onFragmentViewCreated(FragmentManager fm, Fragment f, View v, Bundle savedInstanceState) {
ButtonView button = v.findViewById(R.id.button2);
if(button != null) { //This gets called for all fragments so check for null
button.setOnClickListener(new OnClickListener {...});
}
//Repeat for any other elements in the view e.g.
TextView someText = v.findViewById(R.id.someTextView);
someText.setText(R.string.message);
}
}
//In the activity setup - I usually put in onCreate()
SupportFragmentManager.supportFragmentManager = getSupportFragmentManager();
supportFragmentManager.registerFragmentLifecycleCallbacks(new SetupCallback());
//anonymous version:
//supportFragmentManager.registerFragmentLifecycleCallbacks(new FragmentLifecycleCallback() { /*contents of class*/ });
Alternatively you could possibly initialise the Retrofit and Weather service in the Activity, pass them in to the fragment with the constructor or a bundle, then use them to setup the onClickListener in onCreateView().
The RxJava and SharedView approaches are alternatives to having a listener stuck on all the fragment life cycle calls, vs having alternative architectures which make the fragment more reactive.
This needs the androidx.lifecycle.common dependency. If you're using gradle that would be:
dependencies {
implementation 'androidx.lifecycle:lifecycle-common:2.3.0-rc1'
}

Create a class to get retrofit client like below
class RetrofitClient {
private Retrofit retrofit;
private String BASE_URL = "";
public ServiceAPI getRetrofitInstance() {
if (retrofit == null) {
retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
}
return retrofit.create(WeatherService.class);
}
Now you can call apis inside fragment like this
WeatherService service = RetrofitClient().getRetrofitInstance()
void getCurrentData() {
Call<WeatherResponse> call = service.getCurrentWeatherData(lat, lon, AppId);
call.enqueue(new Callback<WeatherResponse>() {
#Override
public void onResponse(#NonNull Call<WeatherResponse> call, #NonNull Response<WeatherResponse> response) {
if (response.code() == 200) {
WeatherResponse weatherResponse = response.body();
assert weatherResponse != null;
assert response.body() != null;
time_zone.setText(response.body().getTimezone());
time_field.setText(response.body().getCurrent().getDt());
current_temp.setText(getString(R.string.blank, response.body().getCurrent().getTemp() + " ℃"));
current_output.setText(response.body().getCurrent().getWeather().get(0).getDescription());
rise_time.setText(getString(R.string.blank, response.body().getCurrent().getSunrise() + " AM"));
set_time.setText(getString(R.string.blank, response.body().getCurrent().getSunset() + " PM"));
temp_out.setText(getString(R.string.blank, response.body().getCurrent().getTemp() + " ℃"));
Press_out.setText(getString(R.string.blank, response.body().getCurrent().getPressure() + " hpa"));
Humid_out.setText(getString(R.string.blank, response.body().getCurrent().getHumidity() + " %"));
Ws_out.setText(getString(R.string.blank, response.body().getCurrent().getWindSpeed() + " Km/h"));
Visi_out.setText(getString(R.string.blank, response.body().getCurrent().getVisibility() + " m"));
}
}
#Override
public void onFailure(#NonNull Call<WeatherResponse> call, #NonNull Throwable t) {
}
});
}
});
}

Set the data you want to update in the bundle set fragment arguments and call the newInstance then update your views accordingly.
From Activity
FirstFragment.newInstance("yourData","yourData");
In your Fragment
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}

set image bitmap to imageView adapter

At the moment i am using custom adapter/recycle view to build a simple image and a small galery under the image, every time when i click on one of the images below it loads the image in the main imageView above.
My problem at the moment is, that everytime i click on the images on the galery i do a request for the image, i get the id of the clicked image and load again the image to display it above.
I don't like very well my solution, i want to get the bitmap of the clicked image and display it in the imageView above.
So in my main activity i do a simple request to get the main image, the rest of the images are loading in another reques of my activity that loads a recycle view with all images.
here is the activity:
public class PhotosForPlant extends AppCompatActivity implements IResult,PhotosForPlantsAdapter.OnItemClickListener {
RecyclerView recyclerView;
ArrayList<Photo> photos = new ArrayList<Photo>();
VolleyService mVolleyService;
IResult mResultCallback = null;
IResult mResultCallback2 = null;
final String GETREQUEST = "GETCALL";
PhotosForPlantsAdapter adapter;
String token;
TextView familyTxt;
TextView genreTxt;
TextView specieTxt;
TextView specieDescription;
ImageView plantImg;
int familyId;
int genreId;
String familyName;
String genreName;
Double lat = null;
Double lon = null;
Double alt = null;
String time = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTheme(R.style.AppTheme);
setContentView(R.layout.photos_for_plant);
Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);;
setSupportActionBar(myToolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
findViewById(R.id.user_ic2).setVisibility(View.GONE);
TextView toolbarText = (TextView) myToolbar.findViewById(R.id.toolbar_title);
toolbarText.setText("Dados planta");;
familyTxt = (TextView)findViewById(R.id.FamilyName);
genreTxt = (TextView)findViewById(R.id.GenreName);
specieTxt = (TextView)findViewById(R.id.SpecieName);
specieDescription = (TextView)findViewById(R.id.specieDescription);
plantImg = (ImageView)findViewById(R.id.plantImage);
token = checkForToken();
getAllPhotos();
getSpecificPlant();
}
private void getSpecificPlant() {
String id = getIntent().getExtras().getString("plantId");
final String URL = "http://109d0157.ngrok.io/plants/" + id;
getSpecificVolleyCallback();
mVolleyService = new VolleyService(mResultCallback2,this);
mVolleyService.getDataObjectVolley(GETREQUEST,URL,token);
}
private void getAllPhotos() {
String id = getIntent().getExtras().getString("plantId");
final String URL = "http://109d0157.ngrok.io/fotos/" + id + "/plants";
getFotosForPlantVolleyCallback();
mVolleyService = new VolleyService(mResultCallback,this);
mVolleyService.getDataVolley(GETREQUEST,URL,token);
recyclerView = (RecyclerView)findViewById(R.id.gallery);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getApplicationContext(),5,GridLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(layoutManager);
adapter = new PhotosForPlantsAdapter(getApplicationContext(), photos,this);
recyclerView.setAdapter(adapter);
}
private void getSpecificVolleyCallback() {
mResultCallback2 = new IResult() {
#Override
public void notifySuccess(String requestType, JSONObject response) {
try {
Log.d("ENTREIAQUI","ENTREI");
String specie = response.getString("specie");
loadImage(specie);
familyName = response.getJSONObject("genre").getJSONObject("family").getString("name");
genreName = response.getJSONObject("genre").getString("name");
genreId = response.getJSONObject("genre").getInt("id");
genreTxt.setText(genreName);
specieTxt.setText(specie);
familyTxt.setText(familyName);
specieDescription.setText(response.getString("description"));
familyId = response.getJSONObject("genre").getJSONObject("family").getInt("id");
} catch (JSONException e) {
e.printStackTrace();
}
}
#Override
public void notifySuccess(String requestType, JSONArray response) {
Log.d("ENTREIAQUI","ENTREI");
}
#Override
public void notifyError(String requestType, VolleyError error) {
Log.d("erro!",error.toString());
Log.d("ENTREIAQUI","ENTREI");
}
};
}
void getFotosForPlantVolleyCallback(){
mResultCallback = new IResult() {
#Override
public void notifySuccess(String requestType, JSONObject response) {
}
#Override
public void notifySuccess(String requestType, JSONArray response) {
Photo photo;
// iterate over the JSONArray response
for (int i=0; i < response.length(); i++) {
try {
JSONObject object = response.getJSONObject(i); // get the individual object from JSONArray
Log.d("objeto",object.toString());
int id = Integer.parseInt(object.getString("id")); // get the unique identifier from the object
if(lat != null && lon != null && alt != null){
lat = Double.parseDouble(object.getString("lat"));
lon = Double.parseDouble(object.getString("lon"));
alt = Double.parseDouble(object.getString("altitude"));
}
time = object.getString("date");
String path = object.getString("image");
photo = new Photo(path,id,lat,lon,alt,time); // construct the object
photos.add(photo); // add the object to the arraylist so it can be used on the cardLayout
} catch (JSONException e) {
e.printStackTrace();
}
}
adapter.notifyDataSetChanged();
}
#Override
public void notifyError(String requestType, VolleyError error) {
Log.d("resposta",error.toString());
}
};
}
public void genrePressed(View view){
Intent i = new Intent(this,SpecieLibrary.class);
i.putExtra("id",String.valueOf(genreId));
i.putExtra("name",String.valueOf(genreName));
startActivity(i);
}
public void familyPressed(View view){
Intent i = new Intent(this,GenreLibrary.class);
i.putExtra("id",String.valueOf(familyId));
i.putExtra("name",String.valueOf(familyName));
startActivity(i);
}
#Override
public void notifySuccess(String requestType, JSONObject response) {
}
#Override
public void notifySuccess(String requestType, JSONArray response) {
}
#Override
public void notifyError(String requestType, VolleyError error) {
}
public String checkForToken() {
SharedPreferences sharedPref = getSharedPreferences("user", MODE_PRIVATE);
String tokenKey = getResources().getString(R.string.token);
String token = sharedPref.getString(getString(R.string.token), tokenKey); // take the token
return token;
}
public void loadImage(String specie){
String url = "http://109d0157.ngrok.io/images/" + specie + "/Thumbnail.jpg";
Picasso.with(PhotosForPlant.this)
.load(url)
.into(plantImg);
}
#Override
public void onRowClick(int position, int id,String path, View view) {
String url = "http://109d0157.ngrok.io/" + path;
Picasso.with(PhotosForPlant.this)
.load(url)
.into(plantImg);
}
}
the loadImage, is where i load the main image and then i have the onRowClick that comes from my custom adapter, i get the path of the clicked row there and so i load it again, but what i need is to get somehow the bitmap there and setImageResource on the plantImg.
Here is my adapter:
public class PhotosForPlantsAdapter extends RecyclerView.Adapter<PhotosForPlantsAdapter.ViewHolder> {
private ArrayList<Photo> photos;
private Context context;
private OnItemClickListener listener;
public interface OnItemClickListener {
void onRowClick(int position,int id,String path, View view);
}
public PhotosForPlantsAdapter(Context context, ArrayList<Photo> photos,OnItemClickListener listener) {
this.photos = photos;
this.context = context;
this.listener = listener;
}
#Override
public PhotosForPlantsAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.photos_for_plant_row, viewGroup, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(final PhotosForPlantsAdapter.ViewHolder viewHolder, final int i) {
String urlFoto = photos.get(i).getPath();
String url = "http://109d0157.ngrok.io/" + urlFoto;
viewHolder.img.setScaleType(ImageView.ScaleType.CENTER_CROP);
Picasso.with(context)
.load(url)
.resize(240, 120)
.centerInside()
.into(viewHolder.img);
viewHolder.img.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (listener != null) {
listener.onRowClick(viewHolder.getAdapterPosition(),photos.get(i).getId(),photos.get(i).getPath(), view);
}
}
});
}
#Override
public int getItemCount() {
return photos.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
private ImageView img;
public ViewHolder(View view) {
super(view);
img = (ImageView) view.findViewById(R.id.img);
}
}
}

try to set Image in this way as bitmap
URL newurl = new URL("http://109d0157.ngrok.io/" + urlFoto);
mIcon_val=BitmapFactory.decodeStream(newurl.openConnection() .getInputStream());
viewHolder.img.setImageBitmap(mIcon_val);
and get Image in this way
Bitmap imgBitmap = ((BitmapDrawable)image.getDrawable()).getBitmap();

Firebase Database Data Returning Null When Reading

I am not sure why, I have explored both .setValue() and .updateChildren() methods, but for whatever reason when I read data from firebase it is returning null. Here is how I write to Firebase:
Model Poll Class:
#IgnoreExtraProperties
public class Poll {
private String question;
private String image_URL;
public Poll() {
}
public Poll(String Question, String Image_URL) {
this.question = Question;
this.image_URL = Image_URL;
}
public String getQuestion() {
return question;
}
public void setQuestion(String question) {
this.question = question;
}
public String getImage_URL() {
return image_URL;
}
public void setImage_URL(String image_URL) {
this.image_URL = image_URL;
}
#Exclude
public Map<String, Object> toMap(){
HashMap<String, Object> result = new HashMap<>();
result.put("question", question);
result.put("image_URL", image_URL);
return result;
}
}
*I am following the documentation here with my .toMap() method and use of .updateChildren()
Here is where I create my Firebase references and write to the database:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create);
mStorage = FirebaseStorage.getInstance();
mStorageRef = mStorage.getReferenceFromUrl("gs://firebase-fan-polls.appspot.com");
mBaseRef = FirebaseDatabase.getInstance().getReference();
mPollsRef = mBaseRef.child("Polls");
mAddImageButton = (FloatingActionButton) findViewById(R.id.add_image_button);
mAddAnswersButton = (ImageView) findViewById(R.id.add_answers_button);
mImagePreview = (ImageView) findViewById(R.id.preview_image);
mCreatePollQuestion = (EditText) findViewById(R.id.create_poll_question_editText);
mCreatePollAnswerCounter = (TextView) findViewById(R.id.create_poll_answer_counter_TextView);
mEditTextAnswerLayout = (ViewGroup) findViewById(R.id.create_poll_questions_answer_layout);
mSubmitPollCreation = (FloatingActionButton) findViewById(R.id.submit_poll_FAB);
mNumberOfPollAnswersCreatedByUser = 2;
mAnswerChoices = new ArrayList<>();
mCreatePollAnswerCounter.setText(String.valueOf(mNumberOfPollAnswersCreatedByUser));
for (int i = 0; i < mNumberOfPollAnswersCreatedByUser; i++) {
createAnswerChoice(i + 1);
}
mAddAnswersButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mNumberOfPollAnswersCreatedByUser++;
if (mNumberOfPollAnswersCreatedByUser > 5) {
Toast.makeText(getApplicationContext(), R.string.max_create_answers, Toast.LENGTH_SHORT).show();
return;
}
createAnswerChoice(mNumberOfPollAnswersCreatedByUser);
mCreatePollAnswerCounter.setText(String.valueOf(mNumberOfPollAnswersCreatedByUser));
}
});
mSubmitPollCreation.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//TODO: Need to check if poll requirements are added, i.e. Question, Answer, ......
//check if image has been loaded first
if (resultImageURL == null) {
Toast.makeText(getApplicationContext(), getResources().getString(R.string.no_image_selected), Toast.LENGTH_LONG).show();
return;
}
Poll poll = new Poll(mCreatePollQuestion.getText().toString(), resultImageURL);
Map <String, Object> pollMap = poll.toMap();
String key = mBaseRef.child("Polls").push().getKey();
Map<String, Object> childUpdates = new HashMap<String, Object>();
childUpdates.put("/Polls/" + key, pollMap);
mBaseRef.updateChildren(childUpdates);
if (mNumberOfPollAnswersCreatedByUser > 5) {
Toast.makeText(getApplicationContext(), getResources().getText(R.string.poll_answers_greater_than_five), Toast.LENGTH_LONG).show();
mNumberOfPollAnswersCreatedByUser = 5;
}
Intent toHomeActivity = new Intent(CreateActivity.this, HomeActivity.class);
toHomeActivity.putExtra("viewpager_position", 2);
startActivity(toHomeActivity);
}
});
Everything is writing to Firebase correctly, as I can see it in the database in my console. I try and read it from this activity:
public class PollFragment extends Fragment {
#Bind(R.id.comment_label_counter)
TextView mCommentCounter;
#Bind(R.id.comments_label_icon)
ImageView mCommentsLabelIcon;
private DatabaseReference mBaseRef;
private DatabaseReference mPollsRef;
private DatabaseReference mSelectedPollRef;
private RadioGroup mPollQuestionRadioGroup;
private RadioGroup.LayoutParams mParams;
//static
private TextView mCommentsLabel;
private TextView mTotalVoteCounter;
private TextView mSelectedVote;
private TextView mYourVotelabel;
private ViewPager mViewPager;
private int mPagerCurrentPosition;
private static final String VOTE_COUNT_LABEL = "Vote_Count";
private static final String QUESTION_LABEL = "question";
private static final String ANSWERS_LABEL = "Answers";
private static final String POLL_LABEL = "Poll";
private static final String IMAGE_URL = "image_URL";
//all date items; dynamic
private DateFormat mDateFormat;
private Date mDate;
private String mCurrentDateString;
private TextView mPollQuestion;
private ArrayList<RadioButton> mPollAnswerArrayList;
private HorizontalBarChart mPollResults;
ArrayList<BarEntry> pollResultChartValues;
private BarDataSet data;
private ArrayList<IBarDataSet> dataSets;
private ValueEventListener valueEventListener;
private String pollID;
private int mPollIndex;
private ProgressBar mProgressBar;
private OnFragmentInteractionListener mListener;
public PollFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #return A new instance of fragment PollFragment.
*/
// TODO: Rename and change types and number of parameters
// TODO: Decide where to add comments button;
public static PollFragment newInstance(String pollIndex) {
PollFragment fragment = new PollFragment();
Bundle args = new Bundle();
args.putString("POLL_ID", pollIndex);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//TODO: check navigation to see if there are different ID's being generated from trending, following, and new fragments
Bundle args = getArguments();
String pollID = args.getString("POLL_ID");
Log.v("TAG", "THE PASSED ID Is " + pollID);
mBaseRef = FirebaseDatabase.getInstance().getReference();
mPollsRef = mBaseRef.child(POLL_LABEL);
mSelectedPollRef = mPollsRef.child(pollID);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO: Add Fragment Code to check if savedInstanceState == null; add at Activity Level?
// Inflate the layout for this fragment
final ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_poll, container, false);
ButterKnife.bind(this, rootView);
getActivity().setTitle(R.string.todays_polls_title);
//Initialize Poll Results Bar Chart and set to Invisible
mPollResults = (HorizontalBarChart) rootView.findViewById(R.id.poll_results_chart);
mPollResults.setBackgroundColor(getResources().getColor(R.color.white));
mPollResults.setNoDataTextDescription(getResources().getString(R.string.no_results_description));
mPollResults.setVisibility(View.INVISIBLE);
mTotalVoteCounter = (TextView) rootView.findViewById(R.id.total_vote_counter);
mCommentCounter = (TextView) rootView.findViewById(R.id.comment_label_counter);
mCommentCounter = (TextView) rootView.findViewById(R.id.comment_label_counter);
mProgressBar = (ProgressBar) rootView.findViewById(R.id.progress_bar_white);
mPollQuestion = (TextView) rootView.findViewById(R.id.poll_question);
mPollQuestion.setTextSize(TypedValue.COMPLEX_UNIT_PX, getResources().getDimension(R.dimen.poll_question_text_size));
mPollQuestionRadioGroup = (RadioGroup) rootView.findViewById(R.id.poll_question_group);
mSelectedPollRef.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
Log.v("TAG", dataSnapshot.getKey());
//add question
String pollQuestion = (String) dataSnapshot.child(QUESTION_LABEL).getValue();
Log.v("TAG", "THE POLL QUESTION IS " + pollQuestion);
mPollQuestion.setText(pollQuestion);
mPollQuestion.setTypeface(null, Typeface.BOLD);
//add image
String pollImageURL = (String) dataSnapshot.child(IMAGE_URL).getValue();
Log.v("TAG", "THE POLL IMAGE URL IS" + pollImageURL);
Picasso.with(getActivity())
.load(pollImageURL)
.fit()
.placeholder(R.drawable.loading_spinner_white)
.into((ImageView) rootView.findViewById(R.id.poll_image));
Finally, here is my Firebase Database:

Careless mistake:
private static final String POLL_LABEL = "Poll";
Should be:
private static final String POLL_LABEL = "Polls";
The first choice was not the correct Firebase referencing thus causing the error.