Develop Reference

Combining 2 RealmList object in realm android

How to use realm relationships using 2 RealmList, here the example.
Class Menu
public class Menu extends RealmObject {
#SerializedName("name")
private String name;
#SerializedName("module")
private String module;
#SerializedName("controller")
private String controller;
#SerializedName("parent_module")
private String parentModule;
#SerializedName("status")
private Boolean status;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getModule() {
return module;
}
public void setModule(String module) {
this.module = module;
}
public String getController() {
return controller;
}
public void setController(String controller) {
this.controller = controller;
}
public String getParentModule() {
return parentModule;
}
public void setParentModule(String parentModule) {
this.parentModule = parentModule;
}
public Boolean getStatus() {
return status;
}
public void setStatus(Boolean status) {
this.status = status;
}
}
Class Privilege
public class Privilege extends RealmObject {
private String module;
public String getModule() {
return module;
}
public void setModule(String module) {
this.module = module;
}
}
and i'm using this method to save them.
#Override
public void saveMenuPrivilege(RealmList<Menu> menu, RealmList<Privilege> privileges) {
}
now what makes me confuse is, there is a condition where if the module in class Menu has the same module in class Privilege, then set the active field for that module in class Menu to be "true". How to do that? or i'm doing it wrong using the code above?
Thanks in advance

All ready have the answer, just testing all by myself. :D

How to add data to list and use its data on next page and show in listview

I have 2 class one is login_class second is student_class which is showing details of student.
What i have to do is when i login. In response i get the students details like
student_name,student_srno,student_father_name,student_mother_name etc.
This is my bean(Getter Setter) class
package com.smartschoolapp;
public class Bean {
String username, password, srno, studentname, classname, sec, contact,
father_name, mother_name, dob;
public Bean(String username,String password,String srno,String studentname,String classname,String sec,String contact,String father_name,String mother_name,String dob) {
this.username=username;
this.password= password;
this.srno=srno;
this.studentname=studentname;
this.classname=classname;
this.sec=sec;
this.contact=contact;
this.father_name=father_name;
this.mother_name=mother_name;
this.dob =dob;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getSrno() {
return srno;
}
public void setSrno(String srno) {
this.srno = srno;
}
public String getStudentname() {
return studentname;
}
public void setStudentname(String studentname) {
this.studentname = studentname;
}
public String getClassname() {
return classname;
}
public void setClassname(String classname) {
this.classname = classname;
}
public String getSec() {
return sec;
}
public void setSec(String sec) {
this.sec = sec;
}
public String getContact() {
return contact;
}
public void setContact(String contact) {
this.contact = contact;
}
public String getFather_name() {
return father_name;
}
public void setFather_name(String father_name) {
this.father_name = father_name;
}
public String getMother_name() {
return mother_name;
}
public void setMother_name(String mother_name) {
this.mother_name = mother_name;
}
public String getDob() {
return dob;
}
public void setDob(String dob) {
this.dob = dob;
}
public Bean() {
}
}
And this is my login_class where i add data of the student in list.
class login_class extends activity{
Bean beanobj;
List student_detail_list;
.....
{
String name = getting data from response;
......... so on
beanobj = new Bean();
beanobj.studentname(name);
beanobj.student_parent_name(parentname);
.............so on
}
order_list.add(beanobj); // the details to list
}
Now the next activity student_class where i want to show the student in listview
public class student_class extends Activity {
ListView student_listview;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.student_list);
student_listview = (ListView) findViewById(R.id.student_listview);
}
}
*==>> in login_class i have created List student_detail_list how can i get it in my student_class class and retrieve data .
Thanks

There are a lot a ways to do that. 1.Recommended Solution : How to pass an object from one activity to another on Android you can serialize your objects and put it into the intent. This is the recommended solution but there are some problems here. If your data contains a lot of memory, it might crash your application in runtime.
2. You can save your array into the file, send file path to other activity as with URL. In the second activity read the file and create the array in second activity as well.
3. My favourite solution is create a singleton class for student array, reach the class in any activity you want. But you should be careful because singleton pattern has some issues by design also it will stay in memory all the time

Realize the "class Bean implements Parcelable". When go to "student_class" from "login_class", just put the "student bean data" inside the Intent. After going to student_class, you can get the "student bean data" from the intent, here the sample code:
Intent intent = new Intent(login_class.this, student_class.class)
intent.putParcelableArrayListExtra("content", student_detail_list);
startActivity(intent);
In "student_class":
student_detail_list = getIntent().getParcelableArrayListExtra("content");

No setter/field for found Android Firebase

I used FirebaseRecyclerAdapter to get all the childs of "Pro" using a Model class named " Spacecraft" and now I want to retrieve all the candidates into a child of Pro like "1"
I created a public static "candidat" into "Spacecraft" and I used the setters and getters but still the same error
This is my database:
this is the Model Class
public class Spacecraft{
private String name;
private String desc;
private String last;
private candidat candidat;
public Spacecraft.candidat getCandidat() {
return candidat;
}
public void setCandidat(Spacecraft.candidat candidat) {
this.candidat = candidat;
}
public Spacecraft() {
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public String getLast() {
return last;
}
public void setLast(String last) {
this.last = last;
}
public static class candidat{
private String info;
private String namecandid;
public candidat(){}
public String getInfo() {
return info;
}
public void setInfo(String info) {
this.info = info;
}
public String getNamecandid() {
return namecandid;
}
public void setNamecandid(String namecandid) {
this.namecandid = namecandid;
}
}
}
This is my code for FirebaseRecyclerAdapter
#Override
protected void onStart() {
super.onStart();
FirebaseRecyclerAdapter<Spacecraft, candidatviewholder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Spacecraft, candidatviewholder>(
Spacecraft.class,
R.layout.candidat,
candidatviewholder.class,
query){
#Override
protected void populateViewHolder(candidatviewholder viewHolder, Spacecraft model, int position) {
viewHolder.setName1(model.getCandidat().getNamecandid());
viewHolder.setInfo1(model.getCandidat().getInfo());
}
};
rv.setAdapter(firebaseRecyclerAdapter);
}
The error:
No setter/field for key1 found on class com.example.ilyas.evotingapplication.Spacecraft$candidat

I had this error but the above solutions didn't fix it. Hopefully, this alternate solution will help others. If you have that error occur for almost every variable, chances are that you have Proguard enabled and it is removing the un-used getter and setter methods. To fix this, add a line similar to this to your proguard-rules.pro file:
-keep class com.example.yourapp.ObjectClass
where ObjectClass is the name of your java object class that is stored to Firebase.

I think it's just that your data models on Firebase and in Java differ.
In your java class, the Spacecraft class has a candidat field of type Candidat. But, in the database, the candidat field is really a nested object (map), containing one key Key1, which value is a Candidat structure.
So, depending on what did you want to achieve:
if you wanted each spacecraft to have exactly one candidat: save the database object properly, so {info: "info 1", namecandid: "name 1"} is saved directly under candidat field, not one level deeper, so the field has type Candidat in the code.
if you wanted each spacecraft to have a few candidats: instead of private Candidat candidat field, it should be typed Map<String, Candidat>, because that's the type it has in your database screenshot.

Work for me:
-keepclassmembers class com.myPackageName.MyClassName { *; }

Singleton state is not accessible due to context is NULL

We are facing issue with Android application.There is one class named SingleTon which Extends Application and we are using it for State manager.when Application running in background and if I open push notification I am not able to access the Singleton class due o context is null, and that's why application is crashed.Same thing happens if application is on stand by mode.
Here, I have mentioned my SingleTon class Code:
public class StateManager extends Application {
public String FirstName;
public String LastName;
private static StateManager instance;
public static synchronized StateManager getInstance() {
return instance;
}
public String getFirstName() {
return FirstName;
}
public void setFirstName(String firstName) {
FirstName = firstName;
}
public String getLastName() {
return LastName;
}
public void setLastName(String lastName) {
LastName = lastName;
}
#Override
public void onCreate() {
super.onCreate();
instance = this;
Parse.enableLocalDatastore(this);
Parse.initialize(this, "xxxx", "xxxxx");
ParseInstallation.getCurrentInstallation().saveInBackground();
}
#Override
public void onTerminate() {
instance =this;
super.onTerminate();
}
}

just place this line in onCreate of Application class
instance= new StateManager();

May be your instance is not correct please try below code
public static StateManager getInstance(){
if(instance== null){
instance= new StateManager();
}
return instance;
}

Realm database integration with Eclipse Android project

I need to integrate Realm database in my eclipse JUNO(Android Development Tool). I used realm 0.81.1 version. I had include all library files in my android project lib folder and configured realm-0.81.1.jar in buildpath.when "java.lang.IlleagaArgumentException:User is not part of the schema for this realmrun my project it throws error ".
Here User is an class that extends RealmObject.
The User class code is given below:
public class User extends RealmObject {
#PrimaryKey
private String name;
private int age;
#Ignore
private int sessionId;
// Standard getters & setters generated by your IDE…
public String getName() { return name; }
public void setName(String name) { this.name = name; }
public int getAge() { return age; }
public void setAge(int age) { this.age = age; }
public int getSessionId() { return sessionId; }
public void setSessionId(int dontPersist) { this.sessionId = sessionId; }
}
The error is produced when executing the following code:
Realm realm = Realm.getInstance(this);
realm.beginTransaction();
User user = realm.createObject(User.class);
user.setName("Jhon");
user.setAge(10);
realm.commitTransaction();
Please give me suggestion to work with Realm Database
Thanks in advance.

As you are using Eclipse you need to add the #RealmClass annotation manually as it doesn't support inherited annotations. So you model class must look like this:
#RealmClass
public class User extends RealmObject
{
// ...
}
Try this and let me know if it works. Thanks.