activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="16dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="16dp"
tools:context="com.database.firebase.firbasedatabase.MainActivity"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/txt_user"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="16dp"
android:paddingTop="16dp"
android:textSize="20dp" />
<EditText
android:id="@+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Name"
android:inputType="textCapWords"
android:maxLines="1" />
<EditText
android:id="@+id/age"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Age"
android:inputType="text|number"
android:maxLines="1" />
<Button
android:id="@+id/btn_save"
style="?android:textAppearanceSmall"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:background="@color/colorPrimary"
android:text="save"
android:textColor="@android:color/white"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
MainActivity.java
package com.database.firebase.firbasedatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
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.ValueEventListener;
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getSimpleName();
private TextView txtDetails;
private EditText inputName, inputAge;
private Button btnSave;
private DatabaseReference mFirebaseDatabase;
private FirebaseDatabase mFirebaseInstance;
private String userId;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setIcon(R.mipmap.ic_launcher);
txtDetails = (TextView) findViewById(R.id.txt_user);
inputName = (EditText) findViewById(R.id.name);
inputAge = (EditText) findViewById(R.id.age);
btnSave = (Button) findViewById(R.id.btn_save);
mFirebaseInstance = FirebaseDatabase.getInstance();
mFirebaseDatabase = mFirebaseInstance.getReference("users");
mFirebaseInstance.getReference("app_title").setValue("Realtime Database");
mFirebaseInstance.getReference("app_title").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Log.e(TAG, "App title updated");
String appTitle = dataSnapshot.getValue(String.class);
getSupportActionBar().setTitle(appTitle);
}
@Override
public void onCancelled(DatabaseError error) {
Log.e(TAG, "Failed to read app title value.", error.toException());
}
});
btnSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String name = inputName.getText().toString();
String age = inputAge.getText().toString();
if (TextUtils.isEmpty(userId)) {
createUser(name, age);
} else {
updateUser(name, age);
}
}
});
toggleButton();
}
private void toggleButton() {
if (TextUtils.isEmpty(userId)) {
btnSave.setText("Save");
} else {
btnSave.setText("Update");
}
}
private void createUser(String name, String age) {
if (TextUtils.isEmpty(userId)) {
userId = mFirebaseDatabase.push().getKey();
}
User user = new User(name,age);
mFirebaseDatabase.child(userId).setValue(user);
addUserChangeListener();
}
private void addUserChangeListener() {
mFirebaseDatabase.child(userId).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
User user = dataSnapshot.getValue(User.class);
if (user == null) {
Log.e(TAG, "User data is null!");
return;
}
Log.e(TAG, "User data is changed!" + user.name + ", " + user.age);
txtDetails.setText(user.name + ", " + user.age);
inputAge.setText("");
inputName.setText("");
toggleButton();
}
@Override
public void onCancelled(DatabaseError error) {
Log.e(TAG, "Failed to read user", error.toException());
}
});
}
private void updateUser(String name, String age) {
if (!TextUtils.isEmpty(name))
mFirebaseDatabase.child(userId).child("name").setValue(name);
if (!TextUtils.isEmpty(age))
mFirebaseDatabase.child(userId).child("age").setValue(age);
}
}
User.java
package com.database.firebase.firbasedatabase;
/**
* Created by vijay.parjapati on 4/18/2017.
*/
public class User {
public String name;
public String age;
public User() {
}
public User(String name,String age) {
this.name = name;
this.age = age;
}
}
Result in Firbase Database
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