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I want to get OTP from Firebase to my phone for verification purpose, i have done everything as the documentation says but at the end i am not getting OTP please help me, i know something is wrong with my code anyone can correct me ?
my app is connected and working with firebase here is my activity java code :

still am getting error

public class LoginActivity extends AppCompatActivity 

String phone_number;
FirebaseAuth auth;
PhoneAuthProvider.OnVerificationStateChangedCallbacks mCallbacks;

@Override
protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_login);

 mCallbacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks()
 @Override
 public void onVerificationCompleted(PhoneAuthCredential phoneAuthCredential) 

 

 @Override
 public void onVerificationFailed(FirebaseException e) 

 
 ;

 CardView card_view = findViewById(R.id.cardView);
 card_view.setOnClickListener(new View.OnClickListener() 
 @Override
 public void onClick(View v) 
 EditText phonetextview = findViewById(R.id.phonetextview);
 phone_number = PhoneNumberUtils.formatNumber(phonetextview.getText().toString());

 send();

 Toast toast = Toast.makeText(getApplicationContext(), phone_number,
 Toast.LENGTH_SHORT);
 toast.show();
 
 );


private void send() 

 PhoneAuthProvider.getInstance().verifyPhoneNumber(
 phone_number, // Phone number to verify
 60, // Timeout duration
 TimeUnit.SECONDS, // Unit of timeout
 this, // Activity (for callback binding)
 mCallbacks); // ForceResendingToken from callbacks
 

here is the logcat

2019-03-08 15:29:36.095 22108-22108/com.example.meenvandi E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.meenvandi, PID: 22108
java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.example.meenvandi. Make sure to call FirebaseApp.initializeApp(Context) first.
 at com.google.firebase.FirebaseApp.getInstance(com.google.firebase:firebase-common@@16.0.1:219)
 at com.google.firebase.auth.PhoneAuthProvider.getInstance(Unknown Source:5)
 at com.example.meenvandi.LoginActivity.send(LoginActivity.java:96)
 at com.example.meenvandi.LoginActivity.access$000(LoginActivity.java:28)
 at com.example.meenvandi.LoginActivity$2.onClick(LoginActivity.java:77)
 at android.view.View.performClick(View.java:6330)
 at android.view.View$PerformClick.run(View.java:25136)
 at android.os.Handler.handleCallback(Handler.java:790)
 at android.os.Handler.dispatchMessage(Handler.java:99)
 at android.os.Looper.loop(Looper.java:192)
 at android.app.ActivityThread.main(ActivityThread.java:6778)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:875)

2019-03-08 15:29:36.108 22108-22108/com.example.meenvandi I/Process: Sending signal. PID: 22108 SIG: 9

i am getting this error after creating class

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.meenvandi"
tools:ignore="ExtraText">


<uses-permission android:name="android.permission.INTERNET"/>


<application
 android:allowBackup="true"
 android:icon="@mipmap/ic_launcher"
 android:label="@string/app_name"
 android:roundIcon="@mipmap/ic_launcher_round"
 android:supportsRtl="true"
 android:theme="@style/AppTheme">
 <activity android:name=".Otp"></activity>
 <activity
 android:name=".LoginActivity"
 android:theme="@style/AppTheme.NoActionBar" />
 <activity
 android:name=".MainActivity"
 android:label="@string/app_name"
 android:theme="@style/AppTheme.NoActionBar">
 <intent-filter>
 <action android:name="android.intent.action.MAIN" />

 <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>
 </application>

Updated Codes

public class LoginActivity extends AppCompatActivity 

String phone_number;
 FirebaseAuth auth;
 PhoneAuthProvider.OnVerificationStateChangedCallbacks mCallbacks;


@Override
protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_login);




 mCallbacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() 
 

 @Override
 public void onVerificationCompleted(PhoneAuthCredential phoneAuthCredential) 

 

 @Override
 public void onVerificationFailed(FirebaseException e) 
 
 e.printStackTrace();

 Toast toast = Toast.makeText(getApplicationContext(), (CharSequence) e,
 Toast.LENGTH_SHORT);
 toast.show();

 

 
 ;


 CardView card_view = findViewById(R.id.cardView);

 card_view.setOnClickListener(new View.OnClickListener() 

 @Override
 public void onClick(View v) 




 EditText phonetextview = findViewById(R.id.phonetextview);
 phone_number = PhoneNumberUtils.formatNumber(phonetextview.getText().toString());

 send();



 Toast toast = Toast.makeText(getApplicationContext(), phone_number,
 Toast.LENGTH_SHORT);
 toast.show();



 


 );



private void send() 
 FirebaseApp.initializeApp(this);
 PhoneAuthProvider.getInstance().verifyPhoneNumber(
 phone_number, // Phone number to verify
 60, // Timeout duration
 TimeUnit.SECONDS, // Unit of timeout
 this, // Activity (for callback binding)
 mCallbacks); // ForceResendingToken from callbacks

Applicationclass

package com.example.meenvandi;

import android.app.Application;

import com.google.firebase.FirebaseApp;

public class Applicationclass extends Application 
@Override
public void onCreate() 
 super.onCreate();
 FirebaseApp.initializeApp(this);//here we are intializing firebase

updated manifest

<?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.meenvandi"
tools:ignore="ExtraText">


<uses-permission android:name="android.permission.INTERNET"/>


<application
 android:name="com.example.meenvandi.Applicationclass"
 android:allowBackup="true"
 android:icon="@mipmap/ic_launcher"
 android:label="@string/app_name"
 android:roundIcon="@mipmap/ic_launcher_round"
 android:supportsRtl="true"
 android:theme="@style/AppTheme">
 <activity android:name=".Otp"></activity>
 <activity
 android:name=".LoginActivity"
 android:theme="@style/AppTheme.NoActionBar" />
 <activity
 android:name=".MainActivity"
 android:label="@string/app_name"
 android:theme="@style/AppTheme.NoActionBar">
 <intent-filter>
 <action android:name="android.intent.action.MAIN" />

 <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>
</application>

</manifest>

gradle 1

// Top-level build file where you can add configuration options common to 
all sub-projects/modules.

buildscript 
repositories 
 google()
 jcenter()


dependencies 
 classpath 'com.android.tools.build:gradle:3.3.1'
 classpath 'com.google.gms:google-services:4.1.0'

 // NOTE: Do not place your application dependencies here; they belong
 // in the individual module build.gradle files



 allprojects 
 repositories 
 google()
 jcenter()




 task clean(type: Delete) 
 delete rootProject.buildDir
 

gradle 2

apply plugin: 'com.android.application'
 apply plugin: 'com.google.gms.google-services'

android 
 compileSdkVersion 28
 defaultConfig 
 applicationId "com.example.meenvandi"
 minSdkVersion 15
 targetSdkVersion 28
 versionCode 1
 versionName "1.0"
 testInstrumentationRunner 
"android.support.test.runner.AndroidJUnitRunner"

buildTypes 
 release 
 minifyEnabled false
 proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
 

 

dependencies 
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.google.firebase:firebase-core:16.0.3'
implementation 'com.google.firebase:firebase-auth:16.0.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
 

You need to intialize firebase before using it .For that create one Application class .i.e :

public class MyApplication extends Application 

 @Override
 public void onCreate() 
 super.onCreate();
 FirebaseApp.initializeApp(this);//here we are intializing firebase
 

Also don't forget to add this to your AndroidManifest.xml :

<application
 android:name="yourPackage.MyApplication"
 android:allowBackup="true"
 android:icon="@mipmap/route"
 android:theme="@style/AppTheme">
 <!--your activity classes-->
 <activity
 android:name=".YourActivity"
 >
 </application>

Make sure you are not on emulator and then make sure you have added your valid SHA-1 key to the firebase console.

Try this to check what error you are getting

 @Override 
 public void onVerificationFailed(FirebaseException e) 
 e.printStackTrace();