不可转换的类型：无法将 'android.view.View' 转换为 'android.widget.EditText'

Question

我是 android 工作室的新手。 我只是在地址活动中添加 EditText。

我收到此错误：

不可转换的类型：不能将 android.view.View 转换为 android.widget.EditText on (EditText) findViewById(R.id.xmlid);

地址活动：

package com.onlinefire.e_shop.activities;


import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.firestore.DocumentReference;
import com.google.firebase.firestore.FirebaseFirestore;
import com.onlinefire.e_shop.R;

import java.util.HashMap;
import java.util.Map;

public class AddAddressActivity extends AppCompatActivity {

EditText name;
EditText address;
EditText city;
EditText postalCode;
EditText phoneNumber;
Toolbar toolbar;
Button addAddressBtn;

FirebaseFirestore firestore;
FirebaseAuth auth;


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

    toolbar = findViewById(R.id.add_address_toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    toolbar.setNavigationOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            finish();
        }
    });

    auth = FirebaseAuth.getInstance();
    firestore = FirebaseFirestore.getInstance();


    name = (EditText) findViewById(R.id.ad_name);
    address = (EditText) findViewById(R.id.ad_address);
    city = findViewById(R.id.ad_city);
    phoneNumber = findViewById(R.id.ad_phone);
    postalCode = (EditText) findViewById(R.id.ad_code);
    addAddressBtn = findViewById(R.id.ad_add_address);


    addAddressBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            String userName = name.getText().toString();
            String userCity = city.getText().toString();
            String userAddress = address.getText().toString();
            String userCode = postalCode.getText().toString();
            String userNumber = phoneNumber.getText().toString();

            String final_address = "";

            if (!userName.isEmpty()) {
                final_address+=userName+", ";
            }

            if (!userCity.isEmpty()) {
                final_address+=userCity+", ";
            }

            if (!userAddress.isEmpty()) {
                final_address+=userAddress+", ";
            }

            if (!userCode.isEmpty()) {
                final_address+=userCode+", ";
            }

            if (!userNumber.isEmpty()) {
                final_address+=userNumber+", ";
            }
            if (!userName.isEmpty() && !userCity.isEmpty() && !userAddress.isEmpty() && !userCode.isEmpty() && !userNumber.isEmpty()){

                Map<String,String> map = new HashMap<>();
                map.put("userAddress",final_address);

                firestore.collection("CurrentUser").document(auth.getCurrentUser().getUid())
                        .collection("Address").add(map).addOnCompleteListener(new OnCompleteListener<DocumentReference>() {
                    @Override
                    public void onComplete(@NonNull Task<DocumentReference> task) {
                        if (task.isSuccessful()){
                            Toast.makeText(AddAddressActivity.this, "Address Added", Toast.LENGTH_SHORT).show();
                            startActivity(new Intent(AddAddressActivity.this,AddressActivity.class));
                            finish();
                        }
                    }
                });

            }else {
                Toast.makeText(AddAddressActivity.this, "Kindly Fill All Field", Toast.LENGTH_SHORT).show();
              }
          }
      });

    }

}

活动添加地址：

  <?xml version="1.0" encoding="utf-8"?>
  <androidx.constraintlayout.widget.ConstraintLayout 
  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:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context="com.onlinefire.e_shop.activities.AddAddressActivity">


  <TextView
      android:id="@+id/textView8"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_marginStart="56dp"
      android:layout_marginTop="24dp"
      android:text="Create Address"
      android:textSize="24sp"
      app:layout_constraintStart_toStartOf="parent"
      app:layout_constraintTop_toBottomOf="@+id/add_address_toolbar" />

  <com.google.android.material.textfield.TextInputLayout
      android:id="@+id/textInputLayout3"
      android:layout_width="300dp"
      android:layout_height="64dp"
      android:layout_marginTop="40dp"
      android:hint="Name"
      app:layout_constraintEnd_toEndOf="parent"
      app:layout_constraintHorizontal_bias="0.424"
      app:layout_constraintStart_toStartOf="parent"
      app:layout_constraintTop_toBottomOf="@+id/textView8">


    <EditText
        android:id="@+id/ad_name"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:inputType="text" />

</com.google.android.material.textfield.TextInputLayout>

<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/textInputLayout4"

    android:layout_width="300dp"
    android:layout_height="64dp"
    android:layout_marginTop="10dp"
    android:hint="Address Lane"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.424"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textInputLayout3">

    <EditText
        android:id="@+id/ad_address"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:inputType="text" />
</com.google.android.material.textfield.TextInputLayout>

<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/textInputLayout5"

    android:layout_width="300dp"
    android:layout_height="64dp"
    android:layout_marginTop="10dp"
    android:hint="City"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.424"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textInputLayout4">

    <EditText
        android:id="@+id/ad_city"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:inputType="text" />

</com.google.android.material.textfield.TextInputLayout>

<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/textInputLayout6"

    android:layout_width="300dp"
    android:layout_height="64dp"
    android:layout_marginTop="10dp"
    android:hint="Postal Code"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.424"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textInputLayout5">

    <EditText
        android:id="@+id/ad_code"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:inputType="number" />
</com.google.android.material.textfield.TextInputLayout>

<com.google.android.material.textfield.TextInputLayout
    android:layout_width="300dp"
    android:layout_height="64dp"
    android:layout_marginTop="10dp"
    android:hint="Phone Number"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.424"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textInputLayout6">

    <EditText
        android:id="@+id/ad_phone"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:inputType="number" />
</com.google.android.material.textfield.TextInputLayout>

<Button
    android:id="@+id/ad_add_address"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="40dp"
    android:backgroundTint="@color/blue"
    android:text="Add Address"
    android:textColor="@android:color/white"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.504"
    app:layout_constraintStart_toStartOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>

任何类似的问题都对我没有帮助。 请帮我。

Answer 1

您可以通过删除 Android Studio 项目中的 R.java 文件来解决此问题。

Answer 2

很抱歉回答我自己的问题。
此错误已通过删除 Android Studio 项目中的 R.java 文件得到解决。