Android-firebase 问题：“无法解析符号‘存储’”

Question

为 Android Studio 编写 Java。我正在尝试将 Firebase 的下载功能添加到我的应用程序中，但尽管我添加了依赖项和导入，但我收到一条错误消息，提示“无法解析符号‘存储’”。

这是我需要下载实现的课程：

import android.os.Bundle;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.OnProgressListener;
import com.google.firebase.storage.*;
import com.google.firebase.storage.StorageTask;
import com.google.firebase.storage.UploadTask;
import com.squareup.picasso.Picasso;

import androidx.appcompat.app.AppCompatActivity;

public class SearchResultPage extends AppCompatActivity {

    StorageReference storageRef;


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

        // Create a storage reference from our app
        storageRef = storage.getReference();
    }
}

这是我在 gradle 中的依赖项：

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'com.google.android.material:material:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.google.android.material:material:1.1.0'
    implementation 'androidx.vectordrawable:vectordrawable:1.1.0'
    implementation 'androidx.navigation:navigation-fragment:2.2.2'
    implementation 'androidx.navigation:navigation-ui:2.2.2'
    implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
    implementation 'com.squareup.picasso:picasso:2.71828'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
    androidTestImplementation 'com.android.support.test:rules:1.0.2'
    testImplementation "org.mockito:mockito-core:+"
    androidTestImplementation "org.mockito:mockito-android:+"


    implementation 'com.google.firebase:firebase-database:19.3.0'
    implementation 'com.firebaseui:firebase-ui-database:2.3.0'
    implementation 'com.google.firebase:firebase-storage:19.1.1'

    implementation 'com.firebase:firebase-client-android:2.5.0'

} 

Answer 1

您的代码尚未定义storage，在您定义之前您无法使用它。也许你也打算用这个来声明它：

FirebaseStorage storage = FirebaseStorage.getInstance();