无法解决类上的符号错误 - Android Studio

Question

stackoverflow 新手，请多多包涵。

我在某个类上遇到无法解析符号错误。

我有一个名为 CameraPhotoActivity 的课程（如下）：

package com.example.android.frapp;

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

public class CameraPhotoActivity extends AppCompatActivity {

Button uploadButton, showUploadDataButton;

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

    uploadButton = (Button) findViewById(R.id.uploadBtn);
    showUploadDataButton = (Button) findViewById(R.id.showDataBtn);

 uploadButton.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View view) {
         startActivity(new Intent(getApplicationContext().UploadInfo.class));
     }
 });

 showUploadDataButton.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View view) {
     //     startActivity(new Intent(getApplicationContext().ShowData.class));
     }
 });


}



}

这是我遇到问题的部分：

@Override
     public void onClick(View view) {
         startActivity(new Intent(getApplicationContext().UploadInfo.class));
     }

错误在于“UploadInfo.class”。

这表明我没有名为“UploadInfo”的类，但正如您将在下面看到的那样，我有：

package com.example.android.frapp;

import android.app.ProgressDialog;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

import com.firebase.client.Firebase;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.storage.StorageReference;

public class UploadInfo extends AppCompatActivity {

Button selectImageBtn, uploadButton;
ImageView user_image;
TextView title;
public static final int READ_EXTERNAL_STORAGE = 0;
public static final int GALLERY_INTENT = 2;
private ProgressDialog mProgressDialog;
private Firebase mRoofRef;
private Uri mImageUri = null;
private DatabaseReference mDatabaseRef;
private StorageReference mStorage;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.uploading_layout);

    Firebase.setAndroidContext(this);

    selectImageBtn = (Button) findViewById(R.id.selectImageBtn);
    uploadButton = (Button) findViewById(R.id.uploadButton);
    user_image = (ImageView) findViewById(R.id.user_image);
    title = (TextView) findViewById(R.id.etTitle);

    // inititalise the progress bar
    mProgressDialog = new ProgressDialog(UploadInfo.this);

    }
}

下面是 Manifest 文件，您将在其中看到我添加了“UploadInfo”类：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.frapp">

<uses-feature android:name="android.hardware.camera2" android:required="true"></uses-feature>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

<application
    android:name=".FireApp"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".SplashActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".MainLoginActivity" />
    <activity android:name=".MainActivity" />
    <activity
        android:name=".Login"
        android:label="@string/title_activity_login"
        android:theme="@style/AppTheme" />
    <activity
        android:name=".LoginScreenActivity"
        android:label="@string/title_activity_login_screen"
        android:parentActivityName=".MainActivity"
        android:theme="@style/AppTheme">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.example.android.frapp.MainActivity" />
    </activity>
    <activity
        android:name=".CreateCaseActivity"
        android:label="@string/title_activity_create_case"
        android:theme="@style/AppTheme" />
    <activity
        android:name=".NoteTakerActivity"
        android:label="@string/title_activity_note_taker"
        android:theme="@style/AppTheme" />
    <activity android:name=".AddMainNotesActivity"></activity>
    <activity android:name=".CameraPhotoActivity"></activity>
    <activity android:name=".CameraVideoActivity"></activity>
    <activity android:name=".AudioActivity"></activity>
    <activity android:name=".UploadInfo"></activity>
</application>

我的 build.gradle 文件如下：

apply plugin: 'com.android.application'

android {
compileSdkVersion 27
defaultConfig {
    applicationId "com.example.android.frapp"
    minSdkVersion 19
    targetSdkVersion 27
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}

packagingOptions {
    exclude 'META-INF/LICENSE'
    exclude 'META-INF/NOTICE'
}

}



dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
//noinspection GradleCompatible
implementation 'com.android.support:appcompat-v7:27.0.2'
implementation 'com.android.support:design:27.0.2'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
implementation 'com.android.support:support-v4:27.0.2'
implementation 'com.google.firebase:firebase-messaging:11.6.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
compile 'com.google.firebase:firebase-database:11.6.2'
compile 'com.google.firebase:firebase-crash:11.6.2'
compile 'com.google.firebase:firebase-auth:11.6.2'
compile 'com.google.firebase:firebase-storage:11.6.2'
compile 'com.firebase:firebase-client-android:2.5.2'
compile 'com.google.firebase:firebase-core:11.6.2'
compile 'com.firebaseui:firebase-ui-storage:1.2.0'
compile 'com.firebaseui:firebase-ui-database:1.2.0'
compile 'com.github.bumptech.glide:glide:3.7.0'
compile 'com.android.support:cardview-v7:27.0.2'
compile 'com.android.support:recyclerview-v7:27.0.2'
implementation 'com.android.support:cardview-v7:27.0.2'
compile 'com.squareup.picasso:picasso:2.5.2'

// Firebase UI
compile 'com.firebaseui:firebase-ui-database:3.1.2'
compile 'com.android.support:recyclerview-v7:27.0.2'
}
apply plugin: 'com.google.gms.google-services'

我尝试了以下方法：

1. 清理和重建项目
2. 文件 > 使缓存无效/重新启动 > 无效并重新启动
3. 将项目与成绩文件同步
4. 关闭项目，关闭 Android Studio 并从备份中导入项目
5. 我什至尝试删除我创建的类，并通过出现错误的行中给出的选项重新创建它，但它的作用相同。

我希望我没有遗漏一些明显的东西，但我所尝试的一切都是基于我从以前的答案中看到的。

请帮忙

Answer 1

将行改为：

startActivity(new Intent(CameraPhotoActivity.this , UploadInfo.class));