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What is the error which causes the app to stop when retrieving data from Firebase?

This is an app that uses the Firebase database.
I have added all the data in firebase and now I need to retrieve it and display using listview.
I tried to fetch and show the data in my app from firebase but the app is stopping every time.
Take a look at the screenshot
This is the Country model class
Country.java
public class Country {
private String name;
private String total;
private String newCases;
private String totalDeaths;
private String newDeaths;
private String totalRecovered;
private String activeCases;
private String seriousCases;
public Country() {
}
public Country(String name, String total, String newCases, String totalDeaths, String newDeaths, String totalRecovered, String activeCases, String seriousCases) {
this.name = name;
this.total = total;
this.newCases = newCases;
this.totalDeaths = totalDeaths;
this.newDeaths = newDeaths;
this.totalRecovered = totalRecovered;
this.activeCases = activeCases;
this.seriousCases = seriousCases;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTotal() {
return total;
}
public void setTotal(String total) {
this.total = total;
}
public String getNewCases() {
return newCases;
}
public void setNewCases(String newCases) {
this.newCases = newCases;
}
public String getTotalDeaths() {
return totalDeaths;
}
public void setTotalDeaths(String totalDeaths) {
this.totalDeaths = totalDeaths;
}
public String getNewDeaths() {
return newDeaths;
}
public void setNewDeaths(String newDeaths) {
this.newDeaths = newDeaths;
}
public String getTotalRecovered() {
return totalRecovered;
}
public void setTotalRecovered(String totalRecovered) {
this.totalRecovered = totalRecovered;
}
public String getActiveCases() {
return activeCases;
}
public void setActiveCases(String activeCases) {
this.activeCases = activeCases;
}
public String getSeriousCases() {
return seriousCases;
}
public void setSeriousCases(String seriousCases) {
this.seriousCases = seriousCases;
}
}
This is the Activity class
Country_List.java
public class Country_List extends AppCompatActivity {
ListView listView;
FirebaseDatabase firebaseDatabase;
DatabaseReference reff;
ArrayList<String> countries;
ArrayAdapter<String> adapter;
Country country;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_country__list);
listView = (ListView) findViewById(R.id.listView);
country = new Country();
firebaseDatabase = FirebaseDatabase.getInstance();
reff = firebaseDatabase.getReference().child("country");
countries = new ArrayList<>();
adapter = new ArrayAdapter<>(Country_List.this, R.layout.country_info, R.id.country_info_list, countries);
reff.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot ds: dataSnapshot.getChildren()){
country = ds.getValue(Country.class);
countries.add("Country Name:" + country.getName().toString() + "\n" + "Total Cases:" + country.getTotal().toString() + "\n" + "New Cases:" + country.getNewCases().toString() + "\n" + "Total Deaths:" + country.getTotalDeaths().toString() + "\n" + "New Deaths:" + country.getNewCases().toString() + "Total Recovered:" + country.getTotalRecovered().toString() + "Active Cases:" + country.getActiveCases().toString() + "\n" + "Serious Cases:" + country.getSeriousCases().toString());
}
listView.setAdapter(adapter);
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
}
StackTrace
com.google.firebase.database.DatabaseException: Failed to convert value of type java.lang.Long to String
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertString(com.google.firebase:firebase-database##19.2.1:425)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToClass(com.google.firebase:firebase-database##19.2.1:216)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToType(com.google.firebase:firebase-database##19.2.1:178)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$100(com.google.firebase:firebase-database##19.2.1:47)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.deserialize(com.google.firebase:firebase-database##19.2.1:592)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.deserialize(com.google.firebase:firebase-database##19.2.1:562)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertBean(com.google.firebase:firebase-database##19.2.1:432)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToClass(com.google.firebase:firebase-database##19.2.1:231)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertToCustomClass(com.google.firebase:firebase-database##19.2.1:79)
at com.google.firebase.database.DataSnapshot.getValue(com.google.firebase:firebase-database##19.2.1:203)
at com.example.covid_19explorer.Country_List$1.onDataChange(Country_List.java:40)
at com.google.firebase.database.core.ValueEventRegistration.fireEvent(com.google.firebase:firebase-database##19.2.1:75)
at com.google.firebase.database.core.view.DataEvent.fire(com.google.firebase:firebase-database##19.2.1:63)
at com.google.firebase.database.core.view.EventRaiser$1.run(com.google.firebase:firebase-database##19.2.1:55)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

To solve this, you please change all the properties in your Country class to be of type long, except the name, which should remain a String. Please also change all the setters and getters. Your class should look like this:
public class Country {
private String name;
private long total, newCases, totalDeaths, newDeaths, totalRecovered, activeCases, seriousCases;
public Country() {}
public Country(String name, long total, long newCases, long totalDeaths, long newDeaths, long totalRecovered, long activeCases, long seriousCases) {
this.name = name;
this.total = total;
this.newCases = newCases;
this.totalDeaths = totalDeaths;
this.newDeaths = newDeaths;
this.totalRecovered = totalRecovered;
this.activeCases = activeCases;
this.seriousCases = seriousCases;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public long getTotal() {
return total;
}
public void setTotal(long total) {
this.total = total;
}
public long getNewCases() {
return newCases;
}
public void setNewCases(long newCases) {
this.newCases = newCases;
}
public long getTotalDeaths() {
return totalDeaths;
}
public void setTotalDeaths(long totalDeaths) {
this.totalDeaths = totalDeaths;
}
public long getNewDeaths() {
return newDeaths;
}
public void setNewDeaths(long newDeaths) {
this.newDeaths = newDeaths;
}
public long getTotalRecovered() {
return totalRecovered;
}
public void setTotalRecovered(long totalRecovered) {
this.totalRecovered = totalRecovered;
}
public long getActiveCases() {
return activeCases;
}
public void setActiveCases(long activeCases) {
this.activeCases = activeCases;
}
public long getSeriousCases() {
return seriousCases;
}
public void setSeriousCases(long seriousCases) {
this.seriousCases = seriousCases;
}
}
There is one more thing that you need to do, which is to change the type for the newCases property in the database this time, to be of type long, as it is a String now. That plus sign (+) is not recommended to be added in the database, you should add it programmatically.

How do I get class file variable to another activity and access via button using intent not putExtra?

my problem is when I scan Qr code, I want to get the class file variables
and send via btnSearch button to an another activity. plz help me how to do it? sorry for poor English
This is My class file
public class UploadDataGetter {
#SerializedName("record_id")
private int id;
#SerializedName("full_name")
private static String name;
#SerializedName("full_address")
private String address;
#SerializedName("contact")
private String contact;
#SerializedName("dilivery_place")
private String dplace;
#SerializedName("dilivery_place")
private String fdetails;
#SerializedName("no_of_normal")
private int noOfNormal;
#SerializedName("no_of_classified")
private int noOfClassified;
#SerializedName("no_of_cds")
private int noOfCds;
public UploadDataGetter(
//constuctor's para
int record_id,
String full_name,
String full_address,
String contact_number,
String dilivery_place ,
String further_details,
int no_of_normal,
int no_of_classified,
int no_of_cds
)
{
id = record_id;
name = full_name;
address = full_address;
contact = contact_number;
dplace = dilivery_place;
fdetails = further_details;
noOfNormal = no_of_normal;
noOfClassified= no_of_classified;
noOfCds = no_of_cds;
String img_collector ;
String dilivery_status ;
double geo_long;
double geo_lat;
}
public
int getId() {
return id;
}
public
void setId(int id) {
this.id = id;
}
public static
String getName() {
return name;
}
public
void setName(String name) {
this.name = name;
}
public
String getAddress() {
return address;
}
public
void setAddress(String address) {
this.address = address;
}
public
String getContact() {
return contact;
}
public
void setContact(String contact) {
this.contact = contact;
}
public
String getDplace() {
return dplace;
}
public
void setDplace(String dplace) {
this.dplace = dplace;
}
public
String getFdetails() {
return fdetails;
}
public
void setFdetails(String fdetails) {
this.fdetails = fdetails;
}
public
int getNoOfNormal() {
return noOfNormal;
}
public
void setNoOfNormal(int noOfNormal) {
this.noOfNormal = noOfNormal;
}
public
int getNoOfClassified() {
return noOfClassified;
}
public
void setNoOfClassified(int noOfClassified) {
this.noOfClassified = noOfClassified;
}
public
int getNoOfCds() {
return noOfCds;
}
public
void setNoOfCds(int noOfCds) {
this.noOfCds = noOfCds;
}
this is my Qr Activity,
public class QrActivity extends AppCompatActivity {
public static UploadDataGetter id;
public static UploadDataGetter name;
public static UploadDataGetter address;
public static UploadDataGetter dplace;
public static UploadDataGetter fdetails;
public static UploadDataGetter noOfNormal;
public static UploadDataGetter noOfClassified;
public static UploadDataGetter noOfCds;
public static UploadDataGetter img_collector;
public static UploadDataGetter dilivery_status;
/**
* QR code declaration
*/
Button btnscan, btnSearch;
TextView lblSearch;
TextView ID;
TextView DPlace;
TextView Address;
TextView name;
TextView contact;
private Object uploadDataGetter;
private String result;
#Override
protected
void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_qr);
btnscan = (Button) findViewById(R.id.btnscan);
btnscan.setClickable(false);
btnSearch = (Button) findViewById(R.id.btnSearch);
btnSearch.setClickable(false);
lblSearch = (TextView) findViewById(R.id.lblSearch);
final Activity activity = this;
btnscan.setOnClickListener(new View.OnClickListener() {
#Override
public
void onClick(View v) {
btnscan.setClickable(true);
IntentIntegrator integrator = new IntentIntegrator(activity);
integrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE_TYPES);
integrator.setPrompt("Scan");
integrator.setCameraId(0);
integrator.setBeepEnabled(false);
integrator.setBarcodeImageEnabled(false);
integrator.initiateScan();
}
});
//call the class var
if (this.getIntent().getAction().equals("moveData"))
moveData();
}
private void moveData() {
String id = uploadDataGetter.toString();
String name = uploadDataGetter.toString();
String address = uploadDataGetter.toString();
String dplace = uploadDataGetter.toString();
String noOfNormal= uploadDataGetter.toString();
String noOfClassified = uploadDataGetter.toString();
String noOfCds = uploadDataGetter.toString();
//this is for Calling class file
}
#Override
protected
void onActivityResult(int requestCode, int resultCode, Intent data) {
IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
if (result != null) {
if (result.getContents() == null) {
Toast.makeText(this, "You cancelled the scanning", Toast.LENGTH_SHORT).show();
} else {
/**
* Qr code result
* */
lblSearch.setText(result.getContents());
// Toast.makeText(this, result.getContents(), Toast.LENGTH_SHORT).show();
}
} else {
super.onActivityResult(requestCode, resultCode, data);
}
// "Go to Second Activity" button click
View.OnClickListener listener = new View.OnClickListener() {
#Override
public
void onClick(View v) {
btnSearch.setClickable(true);
Intent myIntent= new Intent(QrActivity.this, DistributionDetails.class);
myIntent.setAction("moveData");
startActivity(myIntent);
}
};
btnscan.setOnClickListener(listener);
btnSearch.setOnClickListener(listener);
}
public
void getResults(View view) {
}
}

Replace your class with this
public class UploadDataGetter implements Serializable {
#SerializedName("record_id")
private int id;
#SerializedName("full_name")
private String name;
#SerializedName("full_address")
private String address;
#SerializedName("contact")
private String contact;
#SerializedName("dilivery_place")
private String dplace;
#SerializedName("dilivery_place")
private String fdetails;
#SerializedName("no_of_normal")
private int noOfNormal;
#SerializedName("no_of_classified")
private int noOfClassified;
#SerializedName("no_of_cds")
private int noOfCds;
public UploadDataGetter(
//constuctor's para
int record_id,
String full_name,
String full_address,
String contact_number,
String dilivery_place,
String further_details,
int no_of_normal,
int no_of_classified,
int no_of_cds
) {
id = record_id;
name = full_name;
address = full_address;
contact = contact_number;
dplace = dilivery_place;
fdetails = further_details;
noOfNormal = no_of_normal;
noOfClassified = no_of_classified;
noOfCds = no_of_cds;
String img_collector;
String dilivery_status;
double geo_long;
double geo_lat;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getContact() {
return contact;
}
public void setContact(String contact) {
this.contact = contact;
}
public String getDplace() {
return dplace;
}
public void setDplace(String dplace) {
this.dplace = dplace;
}
public String getFdetails() {
return fdetails;
}
public void setFdetails(String fdetails) {
this.fdetails = fdetails;
}
public int getNoOfNormal() {
return noOfNormal;
}
public void setNoOfNormal(int noOfNormal) {
this.noOfNormal = noOfNormal;
}
public int getNoOfClassified() {
return noOfClassified;
}
public void setNoOfClassified(int noOfClassified) {
this.noOfClassified = noOfClassified;
}
public int getNoOfCds() {
return noOfCds;
}
public void setNoOfCds(int noOfCds) {
this.noOfCds = noOfCds;
}
}
now send this to new activity in intent like this
Intent intent=new Intent(this, NewActivity.class);
int.putExtra("data", YOUR_UPDATE_DATA_GETTER_OBJECT);
Now get the object in the new activity like this
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
public class NewActivity extends Activity {
private UploadDataGetter dataGetter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent=getIntent();
if(intent.hasExtra("data")){
dataGetter= (UploadDataGetter) intent.getSerializableExtra("data");
Log.d("NewActivity","ID: "+dataGetter.getId());
}
}
}

How do I implement polymorphism properly with Interface?

I have 2 model classes(Data,Title) which contain the same field:
String dataID. I want to get both of this IDs with interface implementation.
I am passing Title model through Bundle to another Activity, passing Data model through Bundle in that same activity(just creating new instance of the activity and resetting information).
I want both of my model classes to implement SharedID interface, with method String getSharedId();
How can I get different ids but from different models? I need to put only one parameter and it should be String in my ViewModelFactory constructor.
public class Data implements SharedId,Parcelable {
private String text;
private String textHeader;
private int viewType;
private String mainId;
private String dataID;
public Data() { }
public String getDataID() {
return dataID;
}
public void setDataID(String dataID) {
this.dataID = dataID;
}
public String getText() {return (String) trimTrailingWhitespace(text); }
public void setText(String text) {
this.text = (String) trimTrailingWhitespace(text);
}
public String getTextHeader() {
return (String) trimTrailingWhitespace(textHeader);
}
public void setTextHeader(String textHeader) {
this.textHeader = textHeader;
}
public int getViewType() {
return viewType;
}
public void setViewType(int viewType) {
this.viewType = viewType;
}
public String getMainId() {
return mainId;
}
public void setMainId(String mainId) {
this.mainId = mainId;
}
protected Data(Parcel in) {
text = in.readString();
textHeader = in.readString();
viewType = in.readInt();
mainId = in.readString();
dataID = in.readString();
}
#Override
public String toString() {
return "Data{" +
"order=" +
", text='" + text + '\'' +
", textHeader='" + textHeader + '\'' +
", viewType=" + viewType +
'}';
}
#SuppressWarnings("StatementWithEmptyBody")
public static CharSequence trimTrailingWhitespace(CharSequence source) {
if (source == null) {
return "";
}
int i = source.length();
// loop back to the first non-whitespace character
while (--i >= 0 && Character.isWhitespace(source.charAt(i))) {
}
return source.subSequence(0, i + 1);
}
public static final Creator<Data> CREATOR = new Creator<Data>() {
#Override
public Data createFromParcel(Parcel in) {
return new Data(in);
}
#Override
public Data[] newArray(int size) {
return new Data[size];
}
};
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(text);
dest.writeString(textHeader);
dest.writeInt(viewType);
dest.writeString(mainId);
dest.writeString(dataID);
}
#Override
public String getSharedDataId() {
return getDataID();
}
}
public class Title implements SharedId,Parcelable {
private String dataID;
private String title;
public Title() { }
protected Title(Parcel in) {
dataID = in.readString();
title = in.readString();
}
public String getDataID() {
return dataID;
}
public void setDataID(String dataID) {
this.dataID = dataID;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public static final Creator<Title> CREATOR = new Creator<Title>() {
#Override
public Title createFromParcel(Parcel in) {
return new Title(in);
}
#Override
public Title[] newArray(int size) {
return new Title[size];
}
};
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(dataID);
dest.writeString(title);
}
#NonNull
#Override
public String toString() {
return "Title{" +
"dataID='" + dataID + '\'' +
", titleOrder=" +
", title='" + title + '\'' +
'}';
}
#Override
public String getSharedDataId() {
return getDataID();
}
}
And My DetailActivity code, I already succeeded with the mission of passing id, but i need to do this trough interfaces :( So help me out friends, would really appreciate it!
public class DetailActivity extends AppCompatActivity implements
DetailAdapter.OnDialogClickListener,
DetailAdapter.OnDetailClickListener {
private static String id;
private String parentId;
private Data data;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
TextView tvToolbarTitle = findViewById(R.id.title_toolbar_detail);
tvToolbarTitle.setSelected(true);
findViewById(R.id.btn_back).setOnClickListener(v -> finish());
ArrayList<SharedId> sharedIds = new ArrayList<>();
sharedIds.add(new Title());
sharedIds.add(new Data());
for (SharedId sharedId : sharedIds){
System.out.println(sharedId.getSharedDataId());
}
Bundle bundle = getIntent().getExtras();
if (bundle != null) {
Title model = bundle.containsKey("ID") ? bundle.getParcelable("ID") : null;
Data childModel = bundle.containsKey("idDetail") ? bundle.getParcelable("idDetail") : null;
}
if (bundle != null) {
Title model = bundle.containsKey("ID") ? bundle.getParcelable("ID") : null;
Data childModel = bundle.containsKey("idDetail") ? bundle.getParcelable("idDetail") : null;
String parentId = bundle.getString("mainScreenId");
if (parentId != null) {
this.parentId = parentId;
}
if (model != null) {
this.id = model.getDataID();
tvToolbarTitle.setText(model.getTitle());
}
if (childModel != null) {
this.id = childModel.getDataID();
tvToolbarTitle.setText(childModel.getTextHeader());
}
}
RecyclerView recyclerView = findViewById(R.id.rv_detail);
DetailAdapter adapter = new DetailAdapter(this, this);
recyclerView.setAdapter(adapter);
// TODO: 3/1/19 change it to single ID // DetailViewModelFactory(); // id != null ? id : parentId
DetailViewModelFactory detailViewModelFactory = new DetailViewModelFactory(id != null ? id : parentId);
DetailActivityViewModel viewModel = ViewModelProviders.of(this, detailViewModelFactory).get(DetailActivityViewModel.class);
FirebaseListLiveData<Data> liveData = viewModel.getLiveDataQuery();
liveData.observe(this, adapter::setNewData);
}
#Override
public void onDialogClicked(#NonNull String text) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(HtmlCompat.fromHtml(text, 0, null, new HandlerHtml()));
builder.setPositiveButton("Ok", null);
builder.show();
}
#Override
public void onDetailClicked(Data data) {
Intent intent = new Intent();
DetailActivity.open(DetailActivity.this);
intent.putExtra("idDetail", data);
intent.putExtra("mainScreenId", id);
startActivity(intent);
}
public static void open(#NonNull Context context) {
context.startActivity(new Intent(context, InfoActivity.class));
}
}

I found a bit different, but working solution!
I create an interface
public interface SharedId {
String getSharedDataId();
String getHeader();
}
Both of my model classes Data + Title implemented Interface and methods from it.
In DetailActivity i created 2 Strings.
private String mainId;
private String detailId;
And then passed ids with my model classes with bundle
`SharedId mainId = new Title();
SharedId detailId = new Data();
Bundle bundle = getIntent().getExtras();
if (bundle != null) {
mainId = bundle.containsKey("ID") ? bundle.getParcelable("ID") : null;
detailId = bundle.containsKey("idDetail") ?
bundle.getParcelable("idDetail") : null;
}
if (mainId != null) {
this.detailId = mainId.getSharedDataId();
tvToolbarTitle.setText(mainId.getHeader());
}
if (detailId != null) {
this.mainId = detailId.getSharedDataId();
tvToolbarTitle.setText(detailId.getHeader());
}
And passed in my ViewmodelFactory
DetailViewModelFactory detailViewModelFactory =
new DetailViewModelFactory(this.detailId != null ?
this.detailId : this.mainId);

How can I pass List<Model> from Activity to Fragment

I wanna pass List from Activity to Fragment. But I don't know model class have to implements 'Parcelable' or 'Serializable'. Also How to define implements methods. Thank you for seeing this question. Under codes are my Model class.
public class Artist {
private String artistName;
private String aritstImgPath;
private List<Album> albumList;
public Artist() {
}
public Artist(String artistName, String aritstImgPath, List<Album> albumList) {
this.artistName = artistName;
this.aritstImgPath = aritstImgPath;
this.albumList = albumList;
}
public String getArtistName() {
return artistName;
}
public void setArtistName(String artistName) {
this.artistName = artistName;
}
public String getAritstImgPath() {
return aritstImgPath;
}
public void setAritstImgPath(String aritstImgPath) {
this.aritstImgPath = aritstImgPath;
}
public List<Album> getAlbumList() {
return albumList;
}
public void setAlbumList(List<Album> albumList) {
this.albumList = albumList;
}
#Override
public String toString() {
return "Artist{" +
"artistName='" + artistName + '\'' +
", aritstImgPath='" + aritstImgPath + '\'' +
", albumList=" + albumList +
'}';
}
}
public class Album {
private String albumTitle;
private String albumImgPath;
private List<Song> songList;
public Album() {
}
public Album(String albumTitle, String albumImgPath, List<Song> songList) {
this.albumTitle = albumTitle;
this.albumImgPath = albumImgPath;
this.songList = songList;
}
public String getAlbumTitle() {
return albumTitle;
}
public void setAlbumTitle(String albumTitle) {
this.albumTitle = albumTitle;
}
public String getAlbumImgPath() {
return albumImgPath;
}
public void setAlbumImgPath(String albumImgPath) {
this.albumImgPath = albumImgPath;
}
public List<Song> getSongList() {
return songList;
}
public void setSongList(List<Song> songList) {
this.songList = songList;
}
#Override
public String toString() {
return "Album{" +
"albumTitle='" + albumTitle + '\'' +
", albumImgPath='" + albumImgPath + '\'' +
", songList=" + songList +
'}';
}
}
public class Song {
private String songTitle;
private String playTime;
private String assPath;
private String ampPath;
public Song() {
}
public Song(String songTitle, String playTime, String assPath, String ampPath) {
this.songTitle = songTitle;
this.playTime = playTime;
this.assPath = assPath;
this.ampPath = ampPath;
}
public String getSongTitle() {
return songTitle;
}
public void setSongTitle(String songTitle) {
this.songTitle = songTitle;
}
public String getPlayTime() {
return playTime;
}
public void setPlayTime(String playTime) {
this.playTime = playTime;
}
public String getAssPath() {
return assPath;
}
public void setAssPath(String assPath) {
this.assPath = assPath;
}
public String getAmpPath() {
return ampPath;
}
public void setAmpPath(String ampPath) {
this.ampPath = ampPath;
}
#Override
public String toString() {
return "Song{" +
"songTitle='" + songTitle + '\'' +
", playTime='" + playTime + '\'' +
", assPath='" + assPath + '\'' +
", ampPath='" + ampPath + '\'' +
'}';
}
}
Will I have to implements parcel able or serializable in all my Model class?
When I make bundle What is a correct method? (putSerializable? putParcelable? )
How can I get List in fragment.

You can implement parcelable in your model class.
public class ModelClass implements Parcelable {
public ModelClass(Parcel in) {
super();
readFromParcel(in);
}
public static final Parcelable.Creator<ModelClass> CREATOR = new Parcelable.Creator<ModelClass>() {
public ModelClass createFromParcel(Parcel in) {
return new ModelClass (in);
}
public ModelClass [] newArray(int size) {
return new ModelClass [size];
}
};
public void readFromParcel(Parcel in) {
Value1 = in.readInt();
Value2 = in.readInt();
Value3 = in.readInt();
}
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(Value1);
dest.writeInt(Value2);
dest.writeInt(Value3);
}
}
Sending object to fragment.
ArrayList<ModelClass> arraylist = new Arraylist<>();
Bundle bundle = new Bundle();
bundle.putParcelableArrayList("arraylist", arraylist);
Receiving object from fragment
Bundle extras = getIntent().getExtras();
ArrayList<ModelClass> arraylist = extras.getParcelableArrayList("arraylist");
ModelClass model= arrayList[0];

Thers is two way to pass your List from Activity to Fragment.
1.Serializable and 2. Parcelable
Will I have to implements parcel able or serializable in all my Model class? --> Yes you have to implements Parcelable or serializable in all your classes
When I make bundle What is a correct method? (putSerializable? putParcelable?) --> If yor are using serializable then you have to use putSerializable otherwise putParcelable
How can I get List in fragment. -->
1. Using Serializable
Sending List of object
Bundle bundle = new Bundle();
bundle.putSerializable("key",arraylist);
Receiving list of object
List<Model> = (List<Model>) getArguments().getSerializable("key);
2. Using Parcelable
Sending List of object
Bundle bundle = new Bundle();
bundle.putParcelableArrayList("key", arraylist);
Receiving list of object
List<Model> arraylist = getArguments().getParcelableArrayList("arraylist");

SQLite db isn't created

I have problem with sqlite database adapter in my project.I'm new to android development so I don't have much idea to how can handle this problem. I want to save user information in data base .Although no error while execution,database doesn't create? can any one help.
DatabaseAdapter :
public class DatabaseAdapter {
private final String TAG = "DatabaseAdapter";
private DatabaseOpenHelper openHelper;
public static final String TBL_PERSONS = "persons";
public static final String PERSON_ID = "_id";
public static final String PERSON_USERNAME = "_username";
public static final String PERSON_HEIGHT = "_height";
public static final String PERSON_WEIGHT = "_weight";
public static final String PERSON_AGE = "_age";
public static final String PERSON_GENDER = "_gender";
public static final String PERSON_PA = "_pa";
public static final String PERSON_BMI = "_bmivalue";
public static final String PERSON_INTERPRETATION = "_bmiInterpretation";
public static final String PERSON_IDEALWEIGHT = "_idealweight";
public static final String PERSON_DAILYCALORIES = "_dailycalories";
// ???????????
public DatabaseAdapter(Context context) {
openHelper = new DatabaseOpenHelper(context, "Persons.db", null, 1);
}
// ====================insert in
// database===========================================================
public Long insertPerson(Person person) {
SQLiteDatabase db = null;
Long id = -1L;
try {
ContentValues values = new ContentValues();
values.put("PERSON_USERNAME", person.getUsername());
values.put("PERSON_HEIGHT", person.getHeight());
values.put("PERSON_WEIGHT", person.getWeight());
values.put("PERSON_AGE", person.getAge());
values.put("PERSON_GENDER", person.getGender());
values.put("PERSON_PA", person.getPa());
values.put("PERSON_BMI", person.getBmivalue());
values.put("PERSON_INTERPRETAION", person.getBmiInterpretation());
values.put("PERSON_IDEALWEIGHT", person.getIdealweight());
values.put("PERSON_DAILYCALORIES", person.getDailycalories());
db = openHelper.getWritableDatabase();
id = db.insert(TBL_PERSONS, null, values);
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.getMessage());
} finally {
if (db != null && db.isOpen())
db.close();
}
return id;
}
// ================delete from
// database=============================================================
public int deletePerson(long id) {
SQLiteDatabase db = null;
int count = -1;
try {
db = openHelper.getWritableDatabase();
count = db.delete(TBL_PERSONS, PERSON_ID + "=?",
new String[] { String.valueOf(id) });
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.getMessage());
} finally {
db.close();
}
return count;
}
// ===============update
// database===================================================================
public int updatePerson(Person person) {
SQLiteDatabase db = null;
int count = -1;
try {
db = openHelper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(PERSON_USERNAME, person.getUsername());
values.put(PERSON_HEIGHT, person.getHeight());
values.put(PERSON_WEIGHT, person.getWeight());
values.put(PERSON_AGE, person.getAge());
values.put(PERSON_GENDER, person.getGender());
values.put(PERSON_PA, person.getPa());
values.put(PERSON_BMI, person.getBmivalue());
values.put(PERSON_INTERPRETATION, person.getBmiInterpretation());
values.put(PERSON_IDEALWEIGHT, person.getIdealweight());
values.put(PERSON_DAILYCALORIES, person.getDailycalories());
count = db.update(TBL_PERSONS, values, PERSON_ID + "=?",
new String[] { String.valueOf(person.getId()) });
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.getMessage());
} finally {
db.close();
}
return count;
}
// ===================================================================DATABASEOPENHELPER
// CLASS=========================
class DatabaseOpenHelper extends SQLiteOpenHelper {
public DatabaseOpenHelper(Context context, String name,
CursorFactory factory, int version) {
super(context, name, factory, version);
}
#Override
public void onCreate(SQLiteDatabase db) {
String query = String
.format("create table %s(%$ integer primary key,%s text,%s text,%s text,%s text,%s text,%s tetx,%s text,%s text,%s text,%s text)",
TBL_PERSONS, PERSON_ID, PERSON_USERNAME,
PERSON_HEIGHT, PERSON_WEIGHT, PERSON_AGE,
PERSON_GENDER, PERSON_PA, PERSON_BMI,
PERSON_INTERPRETATION, PERSON_IDEALWEIGHT,
PERSON_DAILYCALORIES);
db.execSQL(query);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
}
person.java (I pass the user data to person.java)
package Databasedata;
public class Person {
private Long id;
private String username;
private float height;
private int weight;
private int age;
private String gender;
private String pa;
private int bmivalue;
private String bmiInterpretation;
private double idealweight;
private double dailycalories;
public double getIdealweight() {
return idealweight;
}
public void setIdealweight(double idealweight) {
this.idealweight = idealweight;
}
public double getDailycalories() {
return dailycalories;
}
public void setDailycalories(double dailycalories) {
this.dailycalories = dailycalories;
}
public int getBmivalue() {
return bmivalue;
}
public void setBmivalue(int bmivalue) {
this.bmivalue = bmivalue;
}
public String getBmiInterpretation() {
return bmiInterpretation;
}
public void setBmiInterpretation(String bmiInterpretation) {
this.bmiInterpretation = bmiInterpretation;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public float getHeight() {
return height;
}
public void setHeight(float height) {
this.height = height;
}
public int getWeight() {
return weight;
}
public void setWeight(int weight) {
this.weight = weight;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public String getPa() {
return pa;
}
public void setPa(String pa) {
this.pa = pa;
}
}
MAIN ACTIVITY
public class MainActivity extends Activity {
String gender;
RadioButton maleRadioButton;
RadioButton femaleRadioButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
maleRadioButton = (RadioButton) findViewById(R.id.maleselected);
femaleRadioButton = (RadioButton) findViewById(R.id.femaleselected);
final RadioGroup genderselected = (RadioGroup) findViewById(R.id.selectgender);
genderselected.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(RadioGroup arg0, int selectedId) {
selectedId=genderselected.getCheckedRadioButtonId();
RadioButton genderchoosed = (RadioButton) findViewById(selectedId);
gender= genderchoosed.getText().toString();
}
});
Button saveinformation = (Button) findViewById(R.id.saveinformation);
saveinformation.setOnClickListener(new View.OnClickListener() {
EditText weighttext = (EditText) findViewById(R.id.weighttext);
EditText heighttext = (EditText) findViewById(R.id.heighttext);
EditText usernametext = (EditText) findViewById(R.id.usernametext);
EditText agetext = (EditText) findViewById(R.id.agetext);
Spinner activitytext = (Spinner) findViewById(R.id.chooseactivity);
Button saveinformation = (Button) findViewById(R.id.saveinformation);
String pa = activitytext.getSelectedItem().toString();
#Override
public void onClick(View v) {
if(maleRadioButton.isChecked()) {
gender= maleRadioButton.getText().toString();
} else {
gender = femaleRadioButton.getText().toString();
}
int weight = (int) Float.parseFloat(weighttext.getText()
.toString());
float height = Float.parseFloat(heighttext.getText()
.toString());
String username = usernametext.getText().toString();
int age = (int) Float.parseFloat(agetext.getText().toString());
String pa = activitytext.getSelectedItem().toString();
// BMI
// ============================================================================================
int Bmivalue = calculateBMI(weight, height);
String bmiInterpretation = interpretBMI(Bmivalue);
float idealweight = idealweight(weight, height, gender, pa, age);
double dailycalories=dailycalories(weight,height,gender,pa,age);
// insert in to
// db==================================================================================
Person person = new Person();
person.setUsername(username);
person.setHeight(height);
person.setWeight(weight);
person.setAge(age);
person.setGender(gender);
person.setPa(pa);
person.setBmivalue(Bmivalue);
person.setBmiInterpretation(bmiInterpretation);
person.setIdealweight(idealweight);
person.setDailycalories(dailycalories);
// ?????????????????????????????????????????/
Databasedata.DatabaseAdapter dbAdapter = new Databasedata.DatabaseAdapter(
MainActivity.this);
dbAdapter.insertPerson(person);
Toast.makeText(getApplicationContext(),
Bmivalue + "and you are" + bmiInterpretation,
Toast.LENGTH_LONG).show();
}
});
}
}

One Problem I see is in your insertPerson() method. Don't include the "" in the values.put()
try replacing below code
ContentValues values = new ContentValues();
values.put("PERSON_USERNAME", person.getUsername());
values.put("PERSON_HEIGHT", person.getHeight());
values.put("PERSON_WEIGHT", person.getWeight());
values.put("PERSON_AGE", person.getAge());
values.put("PERSON_GENDER", person.getGender());
values.put("PERSON_PA", person.getPa());
values.put("PERSON_BMI", person.getBmivalue());
values.put("PERSON_INTERPRETAION", person.getBmiInterpretation());
values.put("PERSON_IDEALWEIGHT", person.getIdealweight());
values.put("PERSON_DAILYCALORIES", person.getDailycalories());
with
ContentValues values = new ContentValues();
values.put(PERSON_USERNAME, person.getUsername());
values.put(PERSON_HEIGHT, person.getHeight());
values.put(PERSON_WEIGHT, person.getWeight());
values.put(PERSON_AGE, person.getAge());
values.put(PERSON_GENDER, person.getGender());
values.put(PERSON_PA, person.getPa());
values.put(PERSON_BMI, person.getBmivalue());
values.put(PERSON_INTERPRETATION, person.getBmiInterpretation());
values.put(PERSON_IDEALWEIGHT, person.getIdealweight());
values.put(PERSON_DAILYCALORIES, person.getDailycalories());