登录
当前位置： 首页 > 知识库问答 >
问题：

Android.Widget.Toolbar不能强制转换为AndroidX.AppCompat.Widget.Toolbar

梁丘波
2023-03-14

当单击按钮时，应用程序崩溃，并且是基于logcat错误的gradle文件中的任何问题。

以下是logcat错误

2020-07-25 11:58:56.040 11494-11620/com.example.dotchat E/ActivityThread: Failed to find provider info for cn.teddymobile.free.anteater.den.provider
2020-07-25 11:58:56.903 11494-11569/com.example.dotchat E/Parcel: Reading a NULL string not supported here.
2020-07-25 11:58:57.356 11494-11494/com.example.dotchat E/Parcel: Reading a NULL string not supported here.
2020-07-25 11:58:58.761 11494-11494/com.example.dotchat E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.dotchat, PID: 11494
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.dotchat/com.example.dotchat.LoginActivity}: java.lang.ClassCastException: android.widget.Toolbar cannot be cast to androidx.appcompat.widget.Toolbar
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2955)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3033)
        at android.app.ActivityThread.-wrap11(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1747)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:200)
        at android.app.ActivityThread.main(ActivityThread.java:6971)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: java.lang.ClassCastException: android.widget.Toolbar cannot be cast to androidx.appcompat.widget.Toolbar
        at com.example.dotchat.LoginActivity.onCreate(LoginActivity.java:35)
        at android.app.Activity.performCreate(Activity.java:7225)
        at android.app.Activity.performCreate(Activity.java:7216)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1215)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2908)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3033) 
        at android.app.ActivityThread.-wrap11(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1747) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:200) 
        at android.app.ActivityThread.main(ActivityThread.java:6971) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 

这是我的RegisterActivity.java文件

package com.example.dotchat;

import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
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.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

import java.util.HashMap;
import java.util.Objects;

public class RegisterActivity extends AppCompatActivity {

    EditText username, email, password;
    Button btn_register;

    FirebaseAuth auth;
    DatabaseReference reference;

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

       Toolbar toolbar=findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(true);
        


        username=findViewById(R.id.username);
        email=findViewById(R.id.email);
        password=findViewById(R.id.password);
        btn_register=findViewById(R.id.btn_register);

        auth=FirebaseAuth.getInstance();

        btn_register.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String txt_username =username.getText().toString();
                String txt_email =email.getText().toString();
                String txt_password =password.getText().toString();

                if (TextUtils.isEmpty(txt_username) ||TextUtils.isEmpty(txt_email) ||TextUtils.isEmpty(txt_password)){
                    Toast.makeText(RegisterActivity.this,"All fields are required!",Toast.LENGTH_SHORT).show();
                } else if (txt_password.length()<8){
                    Toast.makeText(RegisterActivity.this,"Password must be atleast 8 characters!",Toast.LENGTH_SHORT).show();
                } else {
                    register(txt_username,txt_email,txt_password);
                }
            }
        });
    }

    private void register(final String username, String email, String password){

        auth.createUserWithEmailAndPassword(email,password)
                .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isComplete()) {
                            FirebaseUser firebaseUser = auth.getCurrentUser();
                            assert firebaseUser != null;
                            String userid = firebaseUser.getUid();

                            reference = FirebaseDatabase.getInstance().getReference("Users").child(userid);

                            HashMap<String,String> hashMap=new HashMap<>();
                            hashMap.put("id",userid);
                            hashMap.put("username",username);
                            hashMap.put("imageURL","default");

                            reference.setValue(hashMap).addOnCompleteListener(new OnCompleteListener<Void>() {
                                @Override
                                public void onComplete(@NonNull Task<Void> task) {
                                    if (task.isSuccessful()){
                                        Intent intent=new Intent(RegisterActivity.this,MainActivity.class);
                                        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
                                        startActivity(intent);
                                        finish();
                                    }

                                }
                            });
                        } else {
                            Toast.makeText(RegisterActivity.this,"Sorry! You can't register with this email or password",Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }
}

这是loginactivity.java文件

package com.example.dotchat;

import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
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.AuthResult;
import com.google.firebase.auth.FirebaseAuth;

import java.util.Objects;

//import android.widget.Toolbar

public class LoginActivity extends AppCompatActivity {

    EditText  email,password;
    Button btn_login;

    FirebaseAuth auth;

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


       Toolbar toolbar=findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(true);

        auth=FirebaseAuth.getInstance();

        email=findViewById(R.id.email);
        password=findViewById(R.id.password);
        btn_login=findViewById(R.id.btn_login);

        btn_login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String txt_email=email.getText().toString();
                String txt_password=password.getText().toString();

                if(TextUtils.isEmpty(txt_email) || TextUtils.isEmpty(txt_password)){
                    Toast.makeText(LoginActivity.this,"All fields are required",Toast.LENGTH_SHORT).show();
                } else {
                    auth.signInWithEmailAndPassword(txt_email,txt_password)
                            .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                                @Override
                                public void onComplete(@NonNull Task<AuthResult> task) {
                                    if (task.isSuccessful()){
                                        Intent intent=new Intent(LoginActivity.this,MainActivity.class);
                                        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
                                        startActivity(intent);
                                        finish();
                                    } else {
                                        Toast.makeText(LoginActivity.this,"Authentication failed",Toast.LENGTH_SHORT).show();
                                    }

                                }
                            });
                }
            }
        });

    }
}

这是bar_layout.xml文件

<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/toolbar"
    android:background="#79D0D1D0"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    app:popupTheme="@style/MenuStyle">

</androidx.appcompat.widget.Toolbar>

这是gradle文件

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

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.3"

    defaultConfig {
        applicationId "com.example.dotchat"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

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

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'com.google.android.material:material:1.1.0'
    implementation 'com.google.firebase:firebase-auth:19.3.2'
    implementation 'com.google.firebase:firebase-database:19.3.1'
    implementation 'com.google.firebase:firebase-core:17.4.4'
    implementation 'androidx.cardview:cardview:1.0.0'
    implementation 'de.hdodenhof:circleimageview:2.2.0'
    implementation 'com.github.bumptech.glide:glide:4.11.0'
    implementation 'com.rengwuxian.materialedittext:library:2.1.4'
    testImplementation 'junit:junit:4.13'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

}

这是activity_login.xml文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:orientation="vertical"
    android:background="@drawable/appbackground"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".LoginActivity">


    <ImageView
        android:layout_width="145dp"
        android:layout_height="131dp"
        android:layout_gravity="center"
        android:layout_marginLeft="130dp"
        android:layout_marginTop="50dp"
        android:src="@drawable/logotblack1" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingBottom="35dp"
        android:layout_marginLeft="275dp"
        android:layout_marginTop="133dp"
        android:text="C h a t"
        android:textSize="20dp"
        android:textColor="#000" />

    <include
        android:id="@+id/toolbar"
        layout="@layout/bar_layout"
        android:layout_width="match_parent"
        android:layout_height="37dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/toolbar"
        android:layout_marginTop="224dp"
        android:gravity="center_horizontal"
        android:orientation="vertical"
        android:padding="16dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingBottom="35dp"
            android:text="Login into your Account"
            android:textColor="#000"
            android:textSize="20dp"
            />

        <EditText
            android:id="@+id/email"
            android:layout_width="378dp"
            android:layout_height="50dp"
            android:layout_marginTop="10dp"
            android:background="@drawable/edit_round"
            android:drawableRight="@drawable/gmail"
            android:hint="                                       Email"
            android:textColorHint="#fff"
            android:inputType="textEmailAddress" />

        <EditText
            android:id="@+id/password"
            android:layout_width="378dp"
            android:layout_height="50dp"
            android:layout_marginTop="10dp"
            android:background="@drawable/edit_round"
            android:drawableRight="@drawable/psw"
            android:ems="10"
            android:hint="                                    Password"
            android:textColorHint="#fff"
            android:inputType="textPassword" />

        <Button
            android:id="@+id/btn_login"
            android:layout_width="125dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="25dp"
            android:background="@drawable/button_roundl"
            android:text="Login"
            android:textColor="#000" />

    </LinearLayout>

</RelativeLayout>

这是activity_main.xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="wrap_content"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#fff"
            android:theme="@style/Base.ThemeOverlay.AppCompat.Dark.ActionBar"
            app:popupTheme="@style/MenuStyle">

            <de.hdodenhof.circleimageview.CircleImageView
                android:layout_width="30dp"
                android:layout_height="30dp"
                android:id="@+id/profile_image"
                />
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="20dp"
                android:text="Username"
                android:textColor="#000"
                android:textStyle="bold"
                android:layout_marginStart="25dp"/>

        </androidx.appcompat.widget.Toolbar>
    </com.google.android.material.appbar.AppBarLayout>

</LinearLayout>

这是activity_register.xml文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:orientation="vertical"
    android:background="@drawable/appbackground"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".RegisterActivity">


    <ImageView
        android:layout_width="115dp"
        android:layout_height="110dp"
        android:layout_gravity="center"
        android:layout_marginLeft="90dp"
        android:layout_marginTop="100dp"
        android:src="@drawable/logotblack1" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="200dp"
        android:layout_marginTop="153dp"
        android:paddingBottom="35dp"
        android:text="C h a t"
        android:textColor="#000"
        android:textSize="30dp" />

    <include
        android:id="@+id/toolbar"
        layout="@layout/bar_layout"
        android:layout_width="match_parent"
        android:layout_height="37dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/toolbar"
        android:layout_marginTop="278dp"
        android:gravity="center_horizontal"
        android:orientation="vertical"
        android:padding="16dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingBottom="35dp"
            android:text="Create a New Account"
            android:textColor="#000"
            android:textSize="25dp"
            android:textStyle="bold" />

        <EditText

            android:id="@+id/username"
            android:layout_width="279dp"
            android:layout_height="50dp"
            android:layout_marginTop="10dp"
            android:background="@drawable/edit_round"
            android:drawableRight="@drawable/usericon"
            android:hint="                      Username"
            android:textColorHint="#fff"/>

        <EditText
            android:id="@+id/email"
            android:layout_width="278dp"
            android:layout_height="50dp"
            android:layout_marginTop="10dp"
            android:background="@drawable/edit_round"
            android:drawableRight="@drawable/gmail"
            android:hint="                          Email"
            android:inputType="textEmailAddress"
            android:textColorHint="#fff"/>

        <EditText
            android:id="@+id/password"
            android:layout_width="278dp"
            android:layout_height="50dp"
            android:layout_marginTop="10dp"
            android:background="@drawable/edit_round"
            android:drawableRight="@drawable/psw"
            android:ems="10"
            android:hint="                       Password"
            android:inputType="textPassword"
            android:textColorHint="#fff"/>

        <Button
            android:layout_width="176dp"
            android:layout_height="wrap_content"
            android:id="@+id/btn_register"
            android:layout_marginTop="25dp"
            android:background="@drawable/button_round"
            android:text="register now"
            android:textColor="#000" />

    </LinearLayout>

</RelativeLayout>

这是activity_start.xml文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    android:background="@drawable/appbackground"
    tools:context=".StartActivity">
    <ImageView
        android:layout_width="131dp"
        android:layout_height="110dp"
        android:layout_marginLeft="75dp"
        android:layout_marginTop="295dp"
        android:src="@drawable/logotblack1" />

    <ImageView
        android:layout_width="181dp"
        android:layout_height="147dp"
        android:layout_marginLeft="200dp"
        android:layout_marginRight="75dp"
        android:layout_marginTop="299dp"
        android:src="@drawable/chatblack" />




        <Button
            android:id="@+id/login"
            android:layout_width="125dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="650dp"
            android:layout_marginLeft="20dp"
            android:background="@drawable/llogin"
            android:text="Login"
            android:textColor="#000" />

        <Button
            android:id="@+id/register"
            android:layout_width="176dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="650dp"
            android:layout_marginLeft="193dp"
            android:background="@drawable/llogin"
            android:text="register now"
            android:textColor="#000" />

</RelativeLayout>

共有1个答案

萧鸿轩
2023-03-14

xml文件中定义的工具栏类错误。更改自

<工具栏.../>

至

在您的XML中，您可能使用声明了您的工具栏。在这种情况下，工具栏将从包android.widget创建。因此，如果您试图通过将findViewById转换为AndroidX.AppCompat.Widget.Toolbar来调用它，它肯定会抛出一个RuntimeException。

如果您使用的是AndroidX，那么您必须将工具栏的xml声明更改为

然后，您可以继续调用您的（AndroidX.AppCompat.Widget.Toolbar）findViewByid（..）这应该会成功

 类似资料：

相关问答

org.apache.jasper.el.ELContextImpl不能强制转换为org.apache.jasper.runtime.ELContextImplAsyncTask：ClassCastException：java.lang.Object[]不能强制转换为java.lang.String[]io.undertow.servlet.util.IteratorEnumeration不能强制转换为java.lang.StringMyClass不能强制转换为java.lang.Comparable：java.lang.ClassCastExceptionorg.eclipse.ui.part.MultipageEditorSite不能强制转换为org.eclipse.ui.internal.partSite

相关文章

为什么不能将RandomAccessFile强制转换为Inputstream？我怎么可以强制转换为NSManagedObject但不能强制转换为实体的类型？将java.lang.reflect.Method强制转换为功能接口强制转换Arrays.asList导致异常：java.util.Arrays $ ArrayList无法强制转换为java.util.ArrayListClassCastException：不能在连接到MySQL时将java.math.BigInteger强制转换为java.lang.Long

相关阅读

Java16 其他增强功能Java15 其他增强功能Java14 其他增强功能Matlab转换OpenCV彩色图像转为二进制

相关工具

汉字转换为拼音Word转换器UOF OpenXML 转换器GPS火星坐标转换汉字拼音转换工具

相关文档

你不懂JS: 异步与性能强化学习导论中文第二版Python 人工智能Windows 访问控制制造开源软件
快捷导航： 新手教程 算法原理 架构设计 Java进阶 数据库进阶 大厂专栏 面试经验 编程笔记 编程问答 所有专题 文档资料 工具软件 电子书籍 小牛导航
在线工具： 房贷计算器 个税计算器 Linux命令查询 Json格式化 正则表达式 颜色转换 AES加解密 SHA1加密 MD5加密 毒鸡汤 字数统计 随机密码生成 进制转换 Base64编解码 励志句子
Copyright © 2019-2024 小牛知识库@xnip.cn. All Rights Reserved.