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(Android) When Back pressed, Attempt to invoke virtual method 'int java.lang.String.hashCode()' on a null object reference

I've been working on a Android Project (A Basic College Information App), I have three main activities, the user goes in like, Goal/Course Select activity-> CollegeList activity-> College Details Activity. Now When I press back on College Details Activity it crashes with this Error:
Attempt to invoke virtual method 'int java.lang.String.hashCode()' on a null object reference
Below are the files/code which I think might be responsible for this.....
CollegeListActivity.java file
package com.anurag.college_information.activities;
import static com.anurag.college_information.activities.CareerGoalActivity.GOAL;
import static com.anurag.college_information.activities.CareerGoalActivity.SHARED_PREFS;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.anurag.college_information.R;
import com.anurag.college_information.adapters.RecyclerAdapter;
import com.anurag.college_information.models.ModelClass;
import java.util.ArrayList;
import java.util.List;
public class CollegeListActivity extends AppCompatActivity {
private RecyclerAdapter.RecyclerViewClickListener listener;
//ListView collegeList;
TextView collegeListTitle;
Button courseChange;
RecyclerView recyclerView;
LinearLayoutManager LayoutManager;
RecyclerAdapter recyclerAdapter;
List<ModelClass> cList;
String courseName;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_college_list);
collegeListTitle = findViewById(R.id.college_list_title);
courseChange = findViewById(R.id.btn_change_course);
//collegeListTitle.setText(goal + "Colleges");
collegeListTitle.setText(getIntent().getStringExtra("Title") + " Colleges");
initData();
initRecyclerView();
//collegeList = findViewById(R.id.lv_college_list);
courseChange.setTransformationMethod(null);
courseChange.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREFS, MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.clear();
editor.apply();
Intent i = new Intent(CollegeListActivity.this, CareerGoalActivity.class);
startActivity(i);
//finish();
}
});
}
private void initData() {
cList = new ArrayList<>();
courseName = getIntent().getStringExtra("Title");
switch (courseName) {
case "BE/BTech":
cList.add(new ModelClass("https://images.static-collegedunia.com/public/college_data/images/campusimage/1479294300b-5.jpg", "A.P. Shah College of Engineering", "Thane", "8.0"));
break;
case "Pharmacy":
cList.add(new ModelClass("https://images.static-collegedunia.com/public/college_data/images/campusimage/14382400753.jpg", "Bombay College Of Pharmacy", "Mumbai", "9.0"));
break;
}
}
private void initRecyclerView() {
setOnClickListener();
recyclerView = findViewById(R.id.recycler_view);
LayoutManager = new LinearLayoutManager(this);
LayoutManager.setOrientation(RecyclerView.VERTICAL);
recyclerView.setLayoutManager(LayoutManager);
recyclerAdapter = new RecyclerAdapter(cList, listener);
recyclerView.setAdapter(recyclerAdapter);
}
private void setOnClickListener() {
listener = new RecyclerAdapter.RecyclerViewClickListener() {
#Override
public void onClick(View v, int position) {
Intent i = new Intent(CollegeListActivity.this, CollegeDetailsActivity.class);
startActivity(i);
}
};
}
#Override
public void onBackPressed() {
new AlertDialog.Builder(this)
.setMessage("Are you sure you want to exit?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
finish();
}
})
.setNegativeButton("No", null)
.show();
}
}
RecyclerAdapter.java
package com.anurag.college_information.adapters;
import android.content.Context;
import android.content.Intent;
import android.telecom.Call;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.anurag.college_information.activities.CollegeDetailsActivity;
import com.anurag.college_information.models.ModelClass;
import com.anurag.college_information.R;
import com.squareup.picasso.Picasso;
import java.util.List;
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
private List<ModelClass> collegeList ;
private RecyclerViewClickListener listener;
List<String> imageUrl, collegeName, collegeLocation, collegeRating;
public RecyclerAdapter(List<ModelClass> collegeList, RecyclerViewClickListener listener){
this.collegeList=collegeList;
this.listener = listener;
}
#NonNull
#Override
public RecyclerAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.college_list_single_row, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull RecyclerAdapter.ViewHolder holder, int position) {
String imageLink = collegeList.get(position).getImageLink();
//int img = collegeList.get(position).getCollegeImage();
String cName = collegeList.get(position).getCollegeName();
String cRating = collegeList.get(position).getCollegeRating();
String cLocation = collegeList.get(position).getLocation();
Picasso.get().load(imageLink).into(holder.imageView);
//holder.setData(img, cName, cRating);
holder.setData(imageLink, cName, cLocation ,cRating);
}
#Override
public int getItemCount() {
return collegeList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private ImageView imageView;
private TextView collegeName, collegeRating, collegeLocation;
public ViewHolder(#NonNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.college_image);
collegeName = itemView.findViewById(R.id.college_name);
collegeRating = itemView.findViewById(R.id.college_rating);
collegeLocation = itemView.findViewById(R.id.college_location);
itemView.setOnClickListener(this);
}
public void setData(String imageLink, String cName, String cLocation, String cRating) {
//imageView.setImageResource(img);
Picasso.get().load(imageLink).error(R.drawable.error).into(imageView);
collegeName.setText(cName);
collegeRating.setText(cRating);
collegeLocation.setText(cLocation);
}
#Override
public void onClick(View v) {
listener.onClick(v, getAdapterPosition());
Intent i = new Intent(v.getContext(), CollegeDetailsActivity.class);
i.putExtra("collegeImage", collegeList.get(getAdapterPosition()).getImageLink());
i.putExtra("collegeName", collegeList.get(getAdapterPosition()).getCollegeName());
i.putExtra("collegeRating", collegeList.get(getAdapterPosition()).getCollegeRating());
i.putExtra("collegeLocation", collegeList.get(getAdapterPosition()).getLocation());
v.getContext().startActivity(i);
}
}
public interface RecyclerViewClickListener{
void onClick(View v, int position);
}
}
CollegeDetailsActivity.java
package com.anurag.college_information.activities;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import com.anurag.college_information.R;
import com.squareup.picasso.Picasso;
public class CollegeDetailsActivity extends AppCompatActivity {
Button btnApply;
ImageView dCollegeImage;
TextView dCollegeName, dCollegeRating, dCollegeLocation;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_college_details);
dCollegeImage = findViewById(R.id.details_college_image);
dCollegeName = findViewById(R.id.details_college_name);
dCollegeRating = findViewById(R.id.details_college_rating);
dCollegeLocation = findViewById(R.id.details_college_location);
btnApply = findViewById(R.id.btn_apply);
Intent i = getIntent();
String cn = i.getStringExtra("collegeName");
String cr = i.getStringExtra("collegeRating");
String ci = i.getStringExtra("collegeImage");
String cl = i.getStringExtra("collegeLocation");
Picasso.get().load(ci).error(R.drawable.error).into(dCollegeImage);
dCollegeName.setText(cn);
dCollegeRating.setText(cr);
dCollegeLocation.setText(cl);
btnApply.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "The institute will be notified, of your application", Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), "The college will contact you, Thank you", Toast.LENGTH_LONG).show();
}
});
}
#Override
public void onBackPressed() {
Intent i = new Intent(CollegeDetailsActivity.this, CollegeListActivity.class);
startActivity(i);
}
}
This is the Error Screenshot:
I'm pretty new to android I've just worked on just 4 to 5 projects,
Any Assistance will be appreciated, Thank You
The commented Out code, is just a normal listview I implemented just In Case, I have to remove the recycler view.

This will probably go away if you don't override onBackPressed in CollegeDetailsActivity. Instead of going back to an activity that had a valid "Title" string extra, the code you posted will go to a new activity where "Title" isn't defined, then get a NullPointerException since courseName will be null in initData (which the error message tells you results in an error on line 81 in that method). Using a null string in a switch results in that type of error
Just remove your onBackPressed entirely in CollegeDetailsActivity.

Clicked list item into a String and transported to another activity

I have made this app where in one particular activity i have a all the items listed in a list view. when you click the list item it goes to another activity where similar thing is happening. after that i was the clicked list items to be converted into a strings and transported into a 3rd activity where i can display those.
when i try to display them this shows in the text view where the clicked text item should have appeared:
this is code for the first activity:
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.internal.Objects;
import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
public class TicketCategory extends AppCompatActivity {
public static String Category;
public String getCategory() {
return Category;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ticket_category);
populateTicketCategoryList();
final ListView listView = (ListView) findViewById(R.id.lvTicketCategory);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
if (i == 0) {
Category = listView.getItemAtPosition(i).toString();
Intent intent = new Intent(TicketCategory.this, Subcategory.class);
startActivity(intent);
}
}
});
}
private void populateTicketCategoryList()
{
ArrayList<CompTicketCategory> arrayOfTicket = CompTicketCategory.getTicket();
CompTicketCategoryAdapter adapter = new CompTicketCategoryAdapter(this, arrayOfTicket);
ListView listView = (ListView) findViewById(R.id.lvTicketCategory);
listView.setAdapter(adapter);
}
}
the code for the second activity is:
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
public class Subcategory extends AppCompatActivity {
public String Category;
public static String Subcat;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_subcategory);
populateSubcategoryList();
final ListView listView = (ListView) findViewById(R.id.lvSubcategory);
ArrayAdapter arrayAdapter = new ArrayAdapter<String>(Subcategory.this, android.R.layout.simple_list_item_1,arrayList);
listView.setAdapter(arrayAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Subcat = listView.getItemAtPosition(i).toString();
Intent intent = new Intent(Subcategory.this, SubmitTicket.class);
startActivity(intent);
}
});
and this is the code for the activity where both of the clicked items should be displayed:
public class SubmitTicket extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_submit_ticket);
Spinner spinner = (Spinner) findViewById(R.id.spinner_priority);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.priority_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
final Button butt = findViewById(R.id.submit);
butt.setOnClickListener(new View.OnClickListener()
{
public void onClick (View view){
Toast.makeText(getApplicationContext(), "The ticket has been submitted", Toast.LENGTH_SHORT).show();
}
});
TextView textView = (TextView)findViewById(R.id.Category_submit_report);
textView.setText(TicketCategory.Category);
TextView tv = (TextView)findViewById(R.id.Subcategory_submit_report);
tv.setText(Subcategory.Subcat);
}
Please help me. i would appreciate any output. thanks!
UPDATE:
after trying
CompTicketCategory model = listView.getItemAtPosition(i);
Category=model.Category; // your Category variable
Category=model.getCategory();
this error is shown;
screenshot

You can use Intent Extra Feature.
In the First Activity,
Intent intent = new Intent(Subcategory.this, SubmitTicket.class);
switch1.putExtra("deviceID", listView.getItemAtPosition(i).toString(););
startActivity(intent);
Then Next activity recall them,
Intent intent = getIntent();
String data = intent.getStringExtra("data");

Try this in your TicketCategory actvity
Use this:
CompSubcategory model = listView.getItemAtPosition(i);
Category=model.Category; // your Category variable
Category=model.getCategory(); // or use getter setter method
Instead of this:
Category = listView.getItemAtPosition(i).toString();

Delete a listview item from activity on button click from another activity

I have a MainActivity that shows a listview with items that I add dynamically to it. So far everything works. Now wanted to create a button that should delete the listview item that was clicked on. Here is the code I came with.
MainActivity
package news;
import android.app.Activity;
import android.content.Intent;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
ArrayAdapter<String> newslist_adapter;
ArrayList<String> new_subject = new ArrayList<>();
ArrayList<String> new_post = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ListView post_view = findViewById(R.id.news_feed);
FloatingActionButton add_post_button = findViewById(R.id.post_btn);
//create click event and pass values of arrays
post_view.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
Intent intent = new Intent(getApplicationContext(), full_post_activity.class);
intent.putExtra("Subject", new_subject);
intent.putExtra("Post", new_post);
intent.putExtra("position", id);
// getApplicationContext().startActivity(intent);
startActivityForResult(intent, 2);
}
});
//create button connection and create keylistener
add_post_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this, addpost_activity.class);
startActivityForResult(intent, 1);
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
final ListView post_view = findViewById(R.id.news_feed);
if (requestCode == 1) {
if(resultCode == Activity.RESULT_OK){
//get subject and post from second activity
String new_subject_value = data.getStringExtra("newSubject");
String new_post_value = data.getStringExtra("newPost");
new_subject.add(new_subject_value);
new_post.add(new_post_value);
newslist_adapter = new ArrayAdapter<>(
MainActivity.this,
android.R.layout.simple_expandable_list_item_1, new_subject);
post_view.setAdapter(newslist_adapter);
}
}
if (requestCode == 2) {
if(resultCode == Activity.RESULT_OK){
String item2delete = data.getStringExtra("id");
new_subject.remove(item2delete);
newslist_adapter = new ArrayAdapter<>(
MainActivity.this,
android.R.layout.simple_expandable_list_item_1, new_subject);
post_view.setAdapter(newslist_adapter);
}
}
}
}
SecondActivity
package news;
import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.ArrayList;
public class full_post_activity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.full_post_activity);
final int id = getIntent().getExtras().getInt("id");
//create view reference
final TextView subject_edit = findViewById(R.id.subject_input);
final TextView post_edit = findViewById(R.id.post_input);
//create button reference
Button delete_button = findViewById(R.id.full_post_delete_btn);
//create click event
delete_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
intent.putExtra("id", id);
setResult(Activity.RESULT_OK, intent);
finish();
}
});
ArrayList<String> subject_array = (ArrayList<String>) getIntent().getSerializableExtra("Subject");
ArrayList<String> post_array = (ArrayList<String>) getIntent().getSerializableExtra("Post");
String subject_string = subject_array.get(0);
String post_string = post_array.get(0);
//set textview text
subject_edit.setText(subject_string);
post_edit.setText(post_string);
}
}
My problem now is that the delete button doesn't do anything besides returning to the MainActivity. What am I doing wrong?

You cannot get id value to MainActivity. This line in second activity cause problem
final int id = getIntent().getExtras().getInt("id");
In Main Activity, You can put id value using name index "position"
intent.putExtra("position", id);
So you should change them to
In Second Activity
final int id = getIntent().getExtras().getInt("position");
or Main Activity
intent.putExtra("id", id);
UPDATED try this in Main Activity
intent.putExtra("id", position);

If you want to stay in the activity where the delete button is I would suggest creating a getter and a setter for the list behind your ListView(Easily generate them with ALT+INSERT).
You can then make an instance of your MainActivity inside the delete_buttons OnClick methode and get said List with the getter.
Remove the Item you need to remove and update the list with your setter, again using your MainActivity instance.
Edit: here are some code samples
Getter and Setter:
public ArrayList<String> getNewPost() {
return this.new_post;
}
public void setNewPost(ArrayList<String> np) {
this.new_post = np;
}
delete_button OnClick methode:
delete_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
MainActivity main=new MainActivity();
ListView<String> np=main.getNewPost();
np.remove("StringToRemove");
main.setNewPost(np);
}
});
I would also suggest you to make a back_button to check if the list was updated, you can use your old delete_button onclick for that.

error when startActivity

happy new year to all of you.
I am having a problem with the method onItemClickListener, because when I tried to toast the position and id ,in my second activity, I get zeros.
here is the code, I rely on the position of the image in the array that is why I need to get the position/id accurately.
+
I am duplicating my array in both activities because I don't know how to access it from the second activity?
MainActivity.java
package swe.trial;
import android.content.Context;
import android.widget.ImageView;
import android.view.View;
import android.view.ViewGroup;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.AdapterView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GridView items = (GridView) findViewById(R.id.itemsList);
items.setAdapter(new item_adapter(this));
items.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//if an item is clicked or selceted,then go to the activity itemDetails:
Intent i= new Intent (MainActivity.this, itemDetails.class);
i.putExtra("position", position);
i.putExtra("id", id);
startActivity(i);
}
});
}
}
class item_adapter extends BaseAdapter {
Integer[] picsId = {
R.drawable.pic1,
R.drawable.pic2,
R.drawable.pic3,
R.drawable.pic4,
R.drawable.pic5,
R.drawable.pic6,
R.drawable.pic7};
private Context context;
public item_adapter(Context context) {
this.context = context;
}
public Object getItem(int position) {
return null;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imgview= new ImageView(context);
imgview.setLayoutParams(new GridView.LayoutParams(250,250));
imgview.setScaleType(ImageView.ScaleType.CENTER_CROP);
imgview.setPadding(20,20,20,20);
imgview.setImageResource(picsId[position]);
return imgview;
}
public long getItemId(int position) {
return position;
}
public int getCount (){
return picsId.length;
}
}
itemDetails.java
package swe.trial;
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.content.Intent;
import android.widget.ImageView;
import android.widget.TextView;
import android.app.Activity;
import android.net.Uri;
import android.view.View;
import android.widget.Toast;
import java.util.ArrayList;
/**
* Created by good on 1/01/17.
*/
public class itemDetails extends AppCompatActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.item);
ArrayList<item> items = new ArrayList<item>();
// items item1=
// Bundle d = getIntent().getExtras();
int id=0;getIntent().getIntExtra("id",id);
int position=0;
getIntent().getIntExtra("position", position);
Toast.makeText( this, "id= " +id + " . and posistion= "+ position, Toast.LENGTH_LONG).show();
Integer[] picsId = {
R.drawable.pic1,
R.drawable.pic2,
R.drawable.pic3,
R.drawable.pic4,
R.drawable.pic5,
R.drawable.pic6,
R.drawable.pic7
};
ImageView imgview = (ImageView) findViewById(R.id.item_image);
imgview.setImageResource(picsId[id+ 1]);
TextView txt= (TextView) findViewById(R.id.pricetxtview);
txt.setText("This is the description provided." + id);
//(id);
// item item1 = {"Red rose", "#/drawable/", 1, 1.25};
// items.add(item1);
// now i will search for the array that holds the given id. and i will retrieve its info and display it again
// in the new layout.
}
}

You misunderstand the way you should use intents.
The right form is like this :
int id =getIntent().getIntExtra("id",0);
int position = getIntent().getIntExtra("position", 0);
when you use getIntExtra , the second parameter is the default value. In case there is not such value with that tag in your intent, it will return that default value.
See Google docs for more info

You have to fetch value according the following way,
int id=0;
int position=0;
i=getIntent().getIntExtra("id",id);
position= getIntent().getIntExtra("position", position);
Toast.makeText( this, "id= " +id + " . and posistion= "+ position, Toast.LENGTH_LONG).show();

Class cast exception when extending ListActivity

I am wondering why I am getting the following logcat when I run my app and try and click on the Daily Forecast option.
Caused by: java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.ListView
HERE IS MY DAILYFORECASTACTIVITY
package com.dredaydesigns.stormy.ui;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Parcelable;
import android.view.View;
import android.widget.ListView;
import android.widget.Toast;
import com.dredaydesigns.stormy.R;
import com.dredaydesigns.stormy.adapters.DayAdapter;
import com.dredaydesigns.stormy.weather.Day;
import java.util.Arrays;
public class DailyForecastActivity extends ListActivity {
private Day[] mDays;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_daily_forecast);
Intent intent = getIntent();
Parcelable[] parcelables = intent.getParcelableArrayExtra(MainActivity.DAILY_FORECAST);
mDays = Arrays.copyOf(parcelables, parcelables.length, Day[].class);
DayAdapter adapter = new DayAdapter(this, mDays);
}
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
String dayOfTheWeek = mDays[position].getDayOfTheWeek();
String conditions = mDays[position].getSummary();
String highTemp = mDays[position].getTemperatureMax() + "";
String message = String.format("On %s the high will be %s and it will be %s", dayOfTheWeek, highTemp, conditions);
Toast.makeText(this, message, Toast.LENGTH_LONG).show();
}
}
EDIT: SORRY FORGOT TO POST THIS!HERE IS ACTIVITY DAILY FORECAST
'package com.dredaydesigns.stormy.ui;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Parcelable;
import android.view.View;
import android.widget.ListView;
import android.widget.Toast;
import com.dredaydesigns.stormy.R;
import com.dredaydesigns.stormy.adapters.DayAdapter;
import com.dredaydesigns.stormy.weather.Day;
import java.util.Arrays;
import butterknife.ButterKnife;
public class DailyForecastActivity extends ListActivity {
private Day[] mDays;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_daily_forecast);
ButterKnife.inject(this);
Intent intent = getIntent();
Parcelable[] parcelables = intent.getParcelableArrayExtra(MainActivity.DAILY_FORECAST);
mDays = Arrays.copyOf(parcelables, parcelables.length, Day[].class);
DayAdapter adapter = new DayAdapter(this, mDays);
}
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
String dayOfTheWeek = mDays[position].getDayOfTheWeek();
String conditions = mDays[position].getSummary();
String highTemp = mDays[position].getTemperatureMax() + "";
String message = String.format("On %s the high will be %s and it will be %s", dayOfTheWeek, highTemp, conditions);
Toast.makeText(this, message, Toast.LENGTH_LONG).show();
}
}
'
Do I need to declare the ListActivity differently?

Set the id of your ListView id as #android:id/list and then your onCreate method will be
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_daily_forecast);
Intent intent = getIntent();
Parcelable[] parcelables = intent.getParcelableArrayExtra(MainActivity.DAILY_FORECAST);
mDays = Arrays.copyOf(parcelables, parcelables.length, Day[].class);
DayAdapter adapter = new DayAdapter(this, mDays);
setListAdapter(adapter);
}