Question

我正在学习构建Android应用程序以将文件上传到AWS S3。首先，我按照tutorial进行了操作。一切运作良好，我成功将文件上传到我的桶。

从上述教程中，我构建了一个应用程序，可以将文件上传到我的S3存储桶。我可以在没有任何错误消息的情况下运行程序，但是，我的S3存储桶中无法看到该文件。我搜索过类似的讨论，但无法真正解决。请参阅我的以下合作

build.gradle

我在这里实现了所需的依赖项

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.example.thanawin.myapplication"
        minSdkVersion 25
        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'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    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'

    implementation 'com.amazonaws:aws-android-sdk-s3:2.6.+'
    implementation 'com.amazonaws:aws-android-sdk-cognito:2.6.+'
    implementation ('com.amazonaws:aws-android-sdk-mobile-client:2.6.+@aar') { transitive = true }
}

的AndroidManifest.xml

在此，我添加了用户权限和服务

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

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application
        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=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service
            android:name="com.amazonaws.mobileconnectors.s3.transferutility.TransferService"
            android:enabled="true" />
    </application>

</manifest>

MainActivity.java

在这里，我将图像文件上传到我的存储桶

package com.example.thanawin.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import com.amazonaws.mobileconnectors.s3.transferutility.TransferUtility;
import java.io.File;
import com.amazonaws.mobileconnectors.s3.transferutility.TransferObserver;

public class MainActivity extends AppCompatActivity {

    private TransferUtility transferUtility;
    private Util util;
    private TransferObserver observer;

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

        util = new Util();
        transferUtility = util.getTransferUtility(this);

        TransferObserver observer = transferUtility.upload(Constants.BUCKET_NAME, "aaa.jpg",
                new File("/sdcard/aaa.jpg")); // upload image "aaa.jpg"
    }
}

Util.java

这是凭证

package com.example.thanawin.myapplication;

import android.content.Context;

import com.amazonaws.auth.CognitoCachingCredentialsProvider;
import com.amazonaws.mobileconnectors.s3.transferutility.TransferUtility;
import com.amazonaws.regions.Region;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3Client;

public class Util {

    private AmazonS3Client sS3Client;
    private CognitoCachingCredentialsProvider sCredProvider;
    private TransferUtility sTransferUtility;


    private CognitoCachingCredentialsProvider getCredProvider(Context context) {
        if (sCredProvider == null) {
            sCredProvider = new CognitoCachingCredentialsProvider(
                    context.getApplicationContext(),
                    Constants.COGNITO_POOL_ID,
                    Regions.fromName(Constants.COGNITO_POOL_REGION));
        }
        return sCredProvider;
    }


    public AmazonS3Client getS3Client(Context context) {
        if (sS3Client == null) {
            sS3Client = new AmazonS3Client(getCredProvider(context.getApplicationContext()));
            sS3Client.setRegion(Region.getRegion(Regions.fromName(Constants.BUCKET_REGION)));
        }
        return sS3Client;
    }


    public TransferUtility getTransferUtility(Context context) {
        if (sTransferUtility == null) {
            sTransferUtility = TransferUtility.builder()
                    .context(context.getApplicationContext())
                    .s3Client(getS3Client(context.getApplicationContext()))
                    .defaultBucket(Constants.BUCKET_NAME)
                    .build();
        }

        return sTransferUtility;
    }
}

Constants.java

我在这里定义了我的KEY

package com.example.thanawin.myapplication;
public class Constants {
    public static final String COGNITO_POOL_ID = "MY_POOL_ID";
    public static final String COGNITO_POOL_REGION = "MY_POOL_REGION";
    public static final String BUCKET_NAME = "BUCKET_NAME";
    public static final String BUCKET_REGION = "BUCKET_REGION";
}

运行代码时，没有错误但我无法获取存储桶中的图像文件。任何建议或意见将不胜感激

更新

我使用的是Android Studio 3.1.2版，SDK版本26.1.1，在Android虚拟设备7.1.1上运行。
我在Logcat中发现了这条消息，我使用与教程中相同的KEY和S3隐私设置

＆＃34; D / CognitoCachingCredentialsProvider：从SharedPreferences加载凭据在SharedPreferences＆＃34;

AWS Android SDK将文件上传到S3，但无法在存储桶中找到它

更新

0 个答案: