I am working with java inside of android studio. I am needing to filter a list of charities by their category when the radio button is chosen. Example: Click Medical radio button and it gives a list of charities that their category is medical. What is the best way to do this? It would be nice if there is a very compact way to do this, but as long as it works I am fine with that. Below is my code for main activity and my object w/ setters and getters.
Main:
package com.example.charityfinder;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import androidx.appcompat.app.AppCompatActivity;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
//references to buttons and other controls
Button submitbtn;
RadioButton medicalRadio, envirRadio, hserviceRadio, educationRadio, publicaRadio,
cultureRadio, domesticvRadio, hrightsRadio, homelessRadio, religionRadio, youthRadio;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
readcharitydata();
filterCharity();
medicalRadio = findViewById(R.id.medicalRadio);
envirRadio = findViewById(R.id.envirRadio);
hserviceRadio = findViewById(R.id.hserviceRadio);
educationRadio = findViewById(R.id.educationRadio);
publicaRadio = findViewById(R.id.publicaRadio);
cultureRadio = findViewById(R.id.cultureRadio);
domesticvRadio = findViewById(R.id.domesticvRadio);
hrightsRadio = findViewById(R.id.hrightsRadio);
homelessRadio = findViewById(R.id.homelessRadio);
religionRadio = findViewById(R.id.religionRadio);
youthRadio = findViewById(R.id.youthRadio);
submitbtn = findViewById(R.id.submitbtn);
submitbtn.setOnClickListener(new View.OnClickListener() {
String category;
@Override
public void onClick(View view) {
if (medicalRadio.isChecked()) {
category = "Medical";
} else if (envirRadio.isChecked()) {
category = "Environmental_Animal";
} else if (hserviceRadio.isChecked()) {
category = "Human_Services";
} else if (educationRadio.isChecked()) {
category = "Education";
} else if (publicaRadio.isChecked()) {
category = "Public_Affairs";
} else if (cultureRadio.isChecked()) {
category = "Culture_Arts_Humanities";
} else if (domesticvRadio.isChecked()) {
category = "Domestic_Violence";
} else if (hrightsRadio.isChecked()) {
category = "Human_Rights";
} else if (homelessRadio.isChecked()) {
category = "Homelessness";
} else if (religionRadio.isChecked()) {
category = "Religious";
} else if (youthRadio.isChecked()) {
category = "Youth";
}
filterCharity(category);
}
});
}
private List<NationalCharity> charities = new ArrayList<>();
private void readcharitydata() {
InputStream is = getResources().openRawResource(R.raw.charities);
BufferedReader reader = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
String line = "";
try {
//ignore headers
reader.readLine();
while ((line = reader.readLine()) != null) {
//split by comma
String[] token = line.split(",");
//Read data
NationalCharity charity = new NationalCharity();
charity.setCharity_name(token[0]);
charity.setCategory(token[1]);
charity.setWeb_address(token[2]);
charity.setAddress(token[3]);
charity.setCity(token[4]);
charity.setState(token[5]);
charity.setZipcode(token[6]);
charity.setMission_statement(token[7]);
charities.add(charity);
Log.d("Debug", "Just created: " charity);
}
} catch (IOException e) {
Log.wtf("Error", "Error reading data file" line, e);
e.printStackTrace();
}
}
//needing to filter here from the charities list
private void filterCharity(String type) {
if(type.equals("Medical")) {}
else if(type.equals("Environmental_Animal")) {}
else if(type.equals("Human_Services")) {}
else if(type.equals("Education")) {}
else if(type.equals("Public_Affairs")) {}
else if(type.equals("Culture_Arts_Humanities")) {}
else if(type.equals("Domestic_Violence")) {}
else if(type.equals("Human_Rights")) {}
else if(type.equals("Homelessness")) {}
else if(type.equals("Religious")) {}
else if(type.equals("Youth")) {}
}
/*Intent intent = new Intent(MainActivity.this, ResultsActivity.class);
intent.putExtra("Category", results);
Log.d("DEBUG: ", results);
startActivity(intent);*/
}
Object:
package com.example.charityfinder;
import io.realm.RealmObject;
import io.realm.annotations.PrimaryKey;
import org.bson.types.ObjectId;
public class NationalCharity extends RealmObject {
@PrimaryKey
private ObjectId _id;
private String Address;
private String Category;
private String Charity_name;
private String City;
private String Mission_statement;
private String State;
private String Web_address;
private String Zipcode;
public NationalCharity() {}
// Standard getters & setters
public ObjectId get_id() { return _id; }
public void set_id(ObjectId _id) { this._id = _id; }
public String getAddress() { return Address; }
public void setAddress(String Address) { this.Address = Address; }
public String getCategory() { return Category; }
public void setCategory(String Category) { this.Category = Category; }
public String getCharity_name() { return Charity_name; }
public void setCharity_name(String Charity_name) { this.Charity_name = Charity_name; }
public String getCity() { return City; }
public void setCity(String City) { this.City = City; }
public String getMission_statement() { return Mission_statement; }
public void setMission_statement(String Mission_statement) { this.Mission_statement = Mission_statement; }
public String getState() { return State; }
public void setState(String State) { this.State = State; }
public String getWeb_address() { return Web_address; }
public void setWeb_address(String Web_address) { this.Web_address = Web_address; }
public String getZipcode() { return Zipcode; }
public void setZipcode(String Zipcode) { this.Zipcode = Zipcode; }
@Override
public String toString() {
return "Charity name: " getCharity_name() " " "Category: " getCategory() "\n"
"Address: " getAddress() " " "City: " getCity() " " "State: " getState() " "
"Zip code: " getZipcode() "\n" "Mission Statement: " getMission_statement() "\n"
"Web Address: " getWeb_address() "\n";
}
}
CodePudding user response：
You can use Stream.filter():
charities.stream().filter(c -> type.equals(c.getCharity_name());
CodePudding user response：
You can try this to filter:
private void filterCharity(String type) {
List<NationalCharity> filteredList = new ArrayList<>();
for(NationalCharity charityData : charities)
if(charityData.getCharity_name().equalsIgnoreCase(type))
filteredList.add(charityData);
// you have the filtered list "filteredList". Use it however you want
}