Firebase PhoneAuthProvider OTP

Question

我制作了一个简单的聊天应用程序，我正在尝试使用Firebases Phone Authentication添加电话号码验证。我已成功添加所有依赖项，数据库工作正常。但是当我点击发送OTP按钮时，我没有通过消息获得任何代码。

这是完整的课程。

package com.sharathnewdev.flashchatnewfirebase;

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.FirebaseException;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.PhoneAuthCredential;
import com.google.firebase.auth.PhoneAuthProvider;

import java.util.concurrent.TimeUnit;

public class FB_Phone extends AppCompatActivity {
    FirebaseAuth mAuth;
    EditText et1, et2;
    Button sendbutton, verifybutton;
    PhoneAuthProvider.OnVerificationStateChangedCallbacks mCallbacks;
    String Verificationcode;
    private static final String TAG = "FB_Phone";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fb_phone);
        et1 = findViewById(R.id.mobileNUMBERTV);
        et2 = findViewById(R.id.verifyTV);
        sendbutton = findViewById(R.id.sendbutton);
        verifybutton = findViewById(R.id.verifybutton);
        sendbutton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                send_Sms();
            }
        });
        verifybutton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                verify();
            }
        });
        mAuth = FirebaseAuth.getInstance();
        mCallbacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {
            @Override
            public void onVerificationCompleted(PhoneAuthCredential phoneAuthCredential) {
            }

            @Override
            public void onVerificationFailed(FirebaseException e) {

            }

            @Override
            public void onCodeSent(String s, PhoneAuthProvider.ForceResendingToken forceResendingToken) {
                super.onCodeSent(s, forceResendingToken);
                Verificationcode = s;
                Toast.makeText(getApplicationContext(), Verificationcode, Toast.LENGTH_SHORT).show();
                Toast.makeText(getApplicationContext(), "The code has been sent to the user", Toast.LENGTH_SHORT).show();
            }
        };

    }

    public void send_Sms() {
        String sent_code = et1.getText().toString();
        Toast.makeText(getApplicationContext(), sent_code, Toast.LENGTH_SHORT).show();
        PhoneAuthProvider.getInstance().verifyPhoneNumber(sent_code, 60, TimeUnit.SECONDS, this, mCallbacks);
    }

    public void signInWithPhone(PhoneAuthCredential credential) {
        mAuth.signInWithCredential(credential).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                if (task.isSuccessful()) {
                    Toast.makeText(getApplicationContext(), "The use has been successfully signed in", Toast.LENGTH_SHORT).show();
                    Intent chatIntent = new Intent(FB_Phone.this, MainChatActivity.class);
                    startActivity(chatIntent);
                }
            }
        });
    }

    public void verify() {
        String recieved_code = et2.getText().toString();
        VerifywithPhone(Verificationcode, recieved_code);

    }

    public void VerifywithPhone(String verificationcode, String recievedcode) {
        PhoneAuthCredential credential = PhoneAuthProvider.getCredential(verificationcode, recievedcode);
        signInWithPhone(credential);

    }
}

在这里，我按下发送按钮时调用send_sms方法。但它只是不通过短信发送任何东西。我试过调试它，但过程刚刚运行，没有任何反应

Logcat显示此错误

java.lang.IllegalArgumentException：如果没有verificationProof，sessionInfo，ortemprary证明，则无法创建PhoneAuthCredential。

请帮忙。我在这做错了什么。