firebase电话号码身份验证获取空引用

Question

我正在尝试在我的应用程序中创建一个电话号码记录部分，以便用户可以使用电话号码登录。当我尝试使用电话号码登录时，我正试图在物理设备上运行我的应用程序，但收到一个错误，显示为空引用。我在互联网上搜索了所有的解决方案，但没有找到任何合适的解决方案来删除这个错误。我还在firebase中允许手机身份验证，我收到了错误。我在活动中使用了国家/地区选择器来获取国家/地区代码，它可以工作文件。

出现错误

PhoneAuthProvider.getInstance().verifyPhoneNumber(
phonestring,
60,
TimeUnit.SECONDS,
Phoneactivity.this,
mCallbacks
);

Phoneactivity.java

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_phoneactivity);
mAuth = FirebaseAuth.getInstance();
initalization();
phonenumbermethod();
emailloginmethod();
}
private void emailloginmethod() {
emaillogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(),Loginactivity.class);
startActivity(intent);
}
});
}
private void phonenumbermethod() {
if(REQUEST.equals("phone")){
submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
REQUEST = "OTP";
String phonenumberstring = phone.getText().toString();
String countrycode = ccp.getSelectedCountryCodeWithPlus();
phonestring = countrycode + phonenumberstring;
//Toast.makeText(getApplicationContext(),phonestring,Toast.LENGTH_SHORT).show();
verificationcodesend();
}
});
}else{
submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
REQUEST = "phone";
otpstring = otp.getText().toString();
otpmethod();
}
});
}
}
private void otpmethod() {
if (TextUtils.isEmpty(otpstring)){
Toast.makeText(getApplicationContext(),"Please enter the verification code", Toast.LENGTH_SHORT).show();
}else{
loadingBar.setTitle("Verification code");
loadingBar.setMessage("Please wait...");
loadingBar.setCanceledOnTouchOutside(false);
loadingBar.show();
PhoneAuthCredential credential = PhoneAuthProvider.getCredential(mVerificationId, otpstring);
signInWithPhoneAuthCredential(credential);
}
}
private void verificationcodesend() {
if(TextUtils.isEmpty(phonestring)){
Toast.makeText(getApplicationContext(),"Please enter phone number",Toast.LENGTH_SHORT).show();
}else{
loadingBar.setTitle("Phone verification");
loadingBar.setMessage("Please wait till we verify your account");
loadingBar.setCanceledOnTouchOutside(false);
loadingBar.show();
Log.i("phoneactivity",phonestring);
PhoneAuthProvider.getInstance().verifyPhoneNumber(
phonestring,
60,
TimeUnit.SECONDS,
Phoneactivity.this,
mCallbacks
);
}
mCallbacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {
@Override
public void onVerificationCompleted(@NonNull PhoneAuthCredential phoneAuthCredential) {
signInWithPhoneAuthCredential(phoneAuthCredential);
}
@Override
public void onVerificationFailed(@NonNull FirebaseException e) {
loadingBar.dismiss();
Toast.makeText(getApplicationContext(),"Please enter the correct phone number", Toast.LENGTH_SHORT).show();
}
@Override
public void onCodeSent(@NonNull String verificationId,
@NonNull PhoneAuthProvider.ForceResendingToken token) {
loadingBar.dismiss();
mVerificationId = verificationId;
mResendToken = token;
Toast.makeText(getApplicationContext(),"Verification code has been send", Toast.LENGTH_SHORT).show();
otpnumber.setVisibility(View.VISIBLE);
phonenumber.setVisibility(View.GONE);
}
};
}
private void signInWithPhoneAuthCredential(PhoneAuthCredential credential) {
mAuth.signInWithCredential(credential)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
loadingBar.dismiss();
sendusertomainActivity();
Toast.makeText(getApplicationContext(),"welcome",Toast.LENGTH_SHORT).show();
} else {
String msg = task.getException().toString();
Toast.makeText(getApplicationContext(),"Error: "+ msg, Toast.LENGTH_SHORT).show();
}
}
});
}
private void sendusertomainActivity() {
Intent intent = new Intent(getApplicationContext(),HomeActivity.class);
startActivity(intent);
}

错误：空引用

java.lang.NullPointerException: null reference
at com.google.android.gms.common.internal.Preconditions.checkNotNull(Unknown Source:2)
at com.google.firebase.auth.PhoneAuthProvider.verifyPhoneNumber(com.google.firebase:firebase-auth@@19.2.0:9)
at com.nanb.Alpha.Phoneactivity.verificationcodesend(Phoneactivity.java:109)
at com.nanb.Alpha.Phoneactivity.access$300(Phoneactivity.java:28)
at com.nanb.Alpha.Phoneactivity$2.onClick(Phoneactivity.java:72)
at android.view.View.performClick(View.java:6608)
at android.view.View.performClickInternal(View.java:6585)
at android.view.View.access$3100(View.java:785)
at android.view.View$PerformClick.run(View.java:25921)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:201)
at android.app.ActivityThread.main(ActivityThread.java:6864)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)

更新

2020-03-15 21:03:00.382 30384-30384/com.nanb.Alpha I/phoneactivity: [phone]

Answer 1

在将mCallback传递到verifyPhoneNumber之前，您没有初始化它，这正是null检查所抱怨的。

要修复此问题，请在调用verifyPhoneNumber之前移动mCallbacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {...。