Android Studio - Database Firebase
Hola amigos en esta ocasiĆ³n les traigo este tutorial de como aprender a crear una aplicaciĆ³n utilizando la Base de datos de Firebase con este ejemplo claro podra aplicarlo a sus aplicaciones.Crear Proyecto Database Firebase Tutorial (AquĆ)
Vamos a crear nuestro proyecto para desarrollar este ejemplo y aprender a utilizar la Base de datos de Firebase.FireBase
Para aƱadir nuestro proyecto en Firebase puede ver los siguientes enlaces.- Chat Message Firebase
Design Database Firebase Tutorial
Vamos a crear el diseƱo de nuestro ejemplo para tener un poco mas claro de como podemos implementarlo en nuestra aplicaciĆ³n.AƱadiremos un archivo al que le pondremos people_list_row.xml en el cual se presentara la informaciĆ³n que vayamos agregando.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/personNameTv"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<TextView
android:id="@+id/personPhone"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
Ahora en el activity_main.xml agregaremos lo siguiente.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/LinearLayout1">
<ListView
android:id="@+id/peopleList"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</ListView>
</RelativeLayout>
<LinearLayout
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="40px"
android:layout_above="@+id/LinearLayout2"
android:gravity="center">
<EditText
android:id="@+id/fullNameEditText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#000000"
android:textSize="16dp"
android:layout_weight="1"
android:hint="Nombre Completo" />
<EditText
android:id="@+id/phoneNumberEditText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Numero Telefono"
android:layout_weight="1"
android:textColor="#000000"/>
</LinearLayout>
<LinearLayout
android:id="@+id/LinearLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="vertical"
android:background="#36FFFFFF">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/loadBtn"
android:text="Load data"
android:textColor="#000000"
android:textStyle="bold"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/addBtn"
android:text="Add item"
android:textColor="#000000"
android:textStyle="bold"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/updateBtn"
android:text="Update item"
android:textColor="#000000"
android:textStyle="bold"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/deleteBtn"
android:text="Delete item"
android:textColor="#000000"
android:textStyle="bold"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<Button
android:id="@+id/findBtn"
android:text="Find item"
android:textColor="#000000"
android:textStyle="bold"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</RelativeLayout>CĆ³digo Database Firebase Tutorial
Vamos a crear el cĆ³digo de nuestra aplicaciĆ³n y quedarĆa de la siguiente manera. Agregaremos varias clases la primera sera para llevar la estructura de datos de los que vamos ingresando.
public class Person {
private String fullName;
private int phoneNumber;
public Person(){
}
public Person(String fullName, int phoneNumber) {
this.fullName = fullName;
this.phoneNumber = phoneNumber;
}
public String getFullName() {
return fullName;
}
public void setFullName(String fullName) {
this.fullName = fullName;
}
public int getPhoneNumber() {
return phoneNumber;
}
public void setPhoneNumber(int phoneNumber) {
this.phoneNumber = phoneNumber;
}
}
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.ArrayList;
/**
* Created by Amal on 12/02/2017.
*/
public class CustomListAdapater extends BaseAdapter {
private ArrayList names;
private ArrayList phoneNumbers;
private AppCompatActivity activity;
private int x=0;
public CustomListAdapater(ArrayList names,ArrayList phoneNumbers,AppCompatActivity activity){
this.names=names;
this.phoneNumbers=phoneNumbers;
this.activity=activity;
}
@Override
public int getCount() {
return names.size();
}
@Override
public Object getItem(int i) {
return names.get(i);
}
@Override
public long getItemId(int i) {
return 0;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
view = LayoutInflater.from(activity.getApplicationContext()).inflate(R.layout.people_list_row,viewGroup,false);
((TextView)view.findViewById(R.id.personPhone)).setText(String.valueOf(phoneNumbers.get(i)));
((TextView)view.findViewById(R.id.personNameTv)).setText(names.get(i));
return view;
}
}
Y por ultimo agregaremos en nuestro MainActivity el siguiente cĆ³digo.
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.ListView;
import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;
import com.google.firebase.database.ValueEventListener;
import java.util.ArrayList;
import java.util.Iterator;
public class MainActivity extends AppCompatActivity {
private DatabaseReference myDatabaseReference;
private String personId;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FirebaseDatabase.getInstance().setPersistenceEnabled(true);
myDatabaseReference=FirebaseDatabase.getInstance().getReference("Person");
personId= myDatabaseReference.push().getKey();
(findViewById(R.id.addBtn)).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
addPerson(((EditText)findViewById(R.id.fullNameEditText)).getText().toString(),
Integer.parseInt(((EditText)findViewById(R.id.phoneNumberEditText)).getText().toString()));
}
});
(findViewById(R.id.updateBtn)).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
updatePerson(((EditText)findViewById(R.id.fullNameEditText)).getText().toString(),Integer.parseInt(((EditText)findViewById(R.id.phoneNumberEditText)).getText().toString()));
}
});
(findViewById(R.id.deleteBtn)).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
removePerson("first added");
}
});
(findViewById(R.id.loadBtn)).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
readData();
}
});
(findViewById(R.id.findBtn)).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
findPerson(((EditText)findViewById(R.id.fullNameEditText)).getText().toString());
}
});
}
private void addPerson(String name,int phoneNumber){
Person person = new Person(name,phoneNumber);
myDatabaseReference.child(personId).setValue(person);
}
private void updatePerson(String name,int phoneNumber){
myDatabaseReference.child(personId).child("fullName").setValue(name);
myDatabaseReference.child(personId).child("phoneNumber").setValue(phoneNumber);
}
private void removePerson(String name){
myDatabaseReference.child(personId).removeValue();
}
private void readData(){
final ArrayList names = new ArrayList<>();
final ArrayList phoneNumbers = new ArrayList<>();
myDatabaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Iterable snapshotIterator = dataSnapshot.getChildren();
Iterator iterator = snapshotIterator.iterator();
while((iterator.hasNext())){
Person value = iterator.next().getValue(Person.class);
names.add(value.getFullName());
phoneNumbers.add(value.getPhoneNumber());
((CustomListAdapater)(((ListView)findViewById(R.id.peopleList)).getAdapter())).notifyDataSetChanged();
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
((ListView)findViewById(R.id.peopleList)).
setAdapter(new CustomListAdapater(names,phoneNumbers,this));
}
private void findPerson(String name){
Query deleteQuery = myDatabaseReference.orderByChild("fullName").equalTo(name);
deleteQuery.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
Iterable snapshotIterator = dataSnapshot.getChildren();
Iterator iterator = snapshotIterator.iterator();
while((iterator.hasNext())){
Log.d("Item found: ",iterator.next().getValue().toString()+"---");
}
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
Log.d("Item not found: ","this item is not in the list");
}
});
}
}
Y con esto ejecutaremos nuestra aplicaciĆ³n para ver el resultado.
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