Java 在实现接口时尝试对空对象引用调用接口方法
以下是applyUpdate的实现:Java 在实现接口时尝试对空对象引用调用接口方法,java,firebase,android-studio,Java,Firebase,Android Studio,以下是applyUpdate的实现: public class forgetPassword extends AppCompatDialogFragment { public ResetDialogListener listener; EditText emailToReset; final String tag="finalProject.bhaa"; String email =" "; @NonNull @Override pu
public class forgetPassword extends AppCompatDialogFragment {
public ResetDialogListener listener;
EditText emailToReset;
final String tag="finalProject.bhaa";
String email =" ";
@NonNull
@Override
public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
LayoutInflater inflater = getActivity().getLayoutInflater();
View view = inflater.inflate(R.layout.forget_password, null);
builder.setView(view)
.setTitle("Reset Password")
.setNegativeButton("cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
}
})
.setPositiveButton("Reset", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Log.i(tag,"---"+email);
email=emailToReset.getText().toString().trim();
Log.i(tag,"---"+email);
try {
listener.applyUpdate(email);
}catch (Exception e){
e.printStackTrace();
Log.i(tag,e.getMessage());
}
}
});
emailToReset= view.findViewById(R.id.emailToReset);
return builder.create();
}
public interface ResetDialogListener {
void applyUpdate(String Email);
}
}
@凌驾
public void applyUpdate(字符串电子邮件){
Log.i(标记为“yyyyyy”);
firebaseAuth.sendPasswordResetEmail(Email).addOnCompleteListener(新OnCompleteListener(){
@凌驾
未完成的公共void(@NonNull任务){
if(task.issusccessful()){
Toast.makeText(MainActivity.this,“检查您的电子邮件…”,Toast.LENGTH\u SHORT);
}否则{
字符串err=task.getException().getMessage();
Toast.makeText(MainActivity.this,“出现错误:+err,Toast.LENGTH\u SHORT.show();
}
}
});
}
这将引发一个异常:
listener.applyUpdate(电子邮件)
尝试在空对象引用上调用接口方法“void com.bha.finalproject.forgetPassword$ResetDialogListener.applyUpdate(java.lang.String)
我需要这个问题的帮助请确保在附加时初始化
侦听器
@Override
public void applyUpdate(String Email) {
Log.i(tag,"yyyyyyy");
firebaseAuth.sendPasswordResetEmail(Email).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (task.isSuccessful()){
Toast.makeText(MainActivity.this,"Check your email .. ",Toast.LENGTH_SHORT);
}else {
String err=task.getException().getMessage();
Toast.makeText(MainActivity.this,"Error Occured: "+err,Toast.LENGTH_SHORT).show();
}
}
});
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
listner = (ResetDialogListener) context
}