Question

stackoverflow新手，请耐心等待。

我在课堂上遇到无法解决符号错误。

我有一个名为CameraPhotoActivity（下面）的课程：

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));
     }
 });


}



}

以下是我遇到问题的部分：

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

错误发生在＆＃39; UploadInfo.class＆＃39;。

这表明我没有一个叫做“上传信息”的课程。但是，正如你将在下面看到的那样，我做了：

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);

    }
}

以下是清单文件，您将看到我已添加了＆＃39; UploadInfo＆＃39;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'

我尝试了以下内容：

清理和重建项目
文件＆gt;无效缓存/重新启动＆gt;无效并重新启动
将项目与成绩档案同步
关闭项目，关闭Android Studio并从备份中导入项目
我甚至试图删除我制作的类，并通过错误出现的行上给出的选项重新创建它但是它做了同样的事情。

我希望我不会错过一些明显的东西，但我所尝试过的一切都是基于我之前的答案中所看到的。

请帮忙

Answer 1

将行更改为：

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

无法在类 - Android Studio上解决符号错误

1 个答案: