Getting Started

Last updated: 2020-12-18 10:40:07

    Relevant Resources

    Preparations

    1. You need an Android app, which can be one of your existing projects or a new one.
    2. Make sure that your Android app’s target API level is 15 (Ice Cream Sandwich) or above.
    3. Prepare a remote address that can be used to obtain your Tencent Cloud temporary key. For more information on temporary keys, please see Implementing Direct Upload for Mobile Apps.

    Step 1. Install the SDK

    Method 1. Automatic integration (recommended)

    Standard SDK

    Add dependencies to the app-level build.gradle file (usually under the app module).

    dependencies {
        ...
        // Add the following line
        implementation 'com.tencent.qcloud:cosxml:5.5.5'
    }

    If you are using Kotlin for development in your project, you can add our KTX extension package, which provides more user-friendly APIs.

    dependencies {
        ...
        // Add the following line
        implementation 'com.tencent.qcloud:cosxml-ktx:5.5.0'
    }

    Simplified SDK

    If you use only the basic object features such as upload, download, and copy and have tight control over the packet size, you can use the simplified SDK.

    Note:

    To integrate the simplified SDK, replace CosXmlService with CosXmlSimpleService.

    First, add the Bintray repository location to your project-level build.gradle file.

    allprojects {
     repositories {
         ...
         // Add a Maven repository
         maven {
             url "https://dl.bintray.com/tencentqcloudterminal/maven"
         }
     }
    }

    Then, change the dependencies to cosxml-lite in the app-level build.gradle file (usually under the app module).

    dependencies {
        ...
        // Add the following line
        implementation 'com.tencent.qcloud:cosxml-lite:5.5.5'
    }

    Disabling MTA reporting

    To provide better user experience, we have introduced Mobile Tencent Analytics (MTA) into the SDK to track down and optimize the SDK quality.

    To disable the MTA feature, add the following statement to the app-level build.gradle file (usually under the app module):

    dependencies {
        ...
        implementation ('com.tencent.qcloud:cosxml:x.x.x'){
            // Add the following line
            exclude group:'com.tencent.qcloud', module: 'mtaUtils'
        }
    }

    Method 2. Manual integration

    1. Download the SDK version

    You can directly download the latest SDK version here or find all versions at SDK Releases.

    After downloading and decompressing the file, you can see that it contains multiple JAR or AAR packages as described below. Please choose the ones you want to integrate.

    Required libraries:

    • cosxml: COS protocol implementation
    • qcloud-foundation: foundation library
    • bolts-tasks: third-party task library
    • okhttp: third-party networking library
    • okio: third-party I/O library

    Optional libraries:

    • mtaUtils: MTA library for SDK improvement
    • mid-sdk: MTA library for SDK improvement
    • mta-android-sdk: MTA library for SDK improvement
    • LogUtils: log module for SDK improvement
    • quic: QUIC protocol, required if you transfer data over QUIC

    2. Integrate the SDK into your project

    Put your libraries in the app-module libs folder and add dependencies to the app-level build.gradle file (usually under the app module):

    dependencies {
        ...
        // Add the following line
        implementation fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
    }

    Step 2. Configure Permissions

    Network permissions

    The SDK needs network permission to communicate with the COS server. Please add the following permission declarations to AndroidManifest.xml under the app module:

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

    Storage permissions

    If you need to read and write files from external storage, please add the following permission declarations to AndroidManifest.xml under the app module:

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

    Note that for Android 6.0 (API level 23) or above, you need to dynamically request storage permissions at runtime.

    Step 3. Use the SDK

    1. Obtain a temporary key

    Implement a BasicLifecycleCredentialProvider subclass to request a temporary key and return the result.

    public static class MySessionCredentialProvider
            extends BasicLifecycleCredentialProvider {
    
        @Override
        protected QCloudLifecycleCredentials fetchNewCredentials() 
                throws QCloudClientException {
    
            // First, obtain the response containing the key from your temporary key server
    
            // Then, parse the response to obtain the temporary key
            String tmpSecretId = "COS_SECRETID"; // SecretId of the temporary key
            String tmpSecretKey = "COS_SECRETKEY"; // SecretKey of the temporary key
            String sessionToken = "TOKEN"; // Token of the temporary key
            long expiredTime = 1556183496L;// End timestamp (in seconds) of the effective period of the temporary key
    
            // To avoid request expiration caused by the large discrepancy between the phone’s local time and the standard time, we recommend that the time returning to the server be used as the signature start time.
            // Time returning to the server as the signature start time
            long startTime = 1556182000L; // Start timestamp (in seconds) of the effective period of the temporary key
    
            // Finally, return the temporary key object
            return new SessionQCloudCredentials(tmpSecretId, tmpSecretKey,
                    sessionToken, startTime, expiredTime);
        }
    }

    The following takes MySessionCredentialProvider as the class name example to initialize an instance to provide a key for the SDK.

    QCloudCredentialProvider myCredentialProvider = new MySessionCredentialProvider();

    Using a permanent key for local debugging

    You can use a Tencent Cloud permanent key for local debugging during the development. As this method may disclose your key, please change to the temporary key method before launching your application.

    String secretId = "COS_SECRETID"; // SecretId of the permanent key
    String secretKey = "COS_SECRETKEY"; // SecretKey of the permanent key
    
    // keyDuration is the effective duration (in seconds) of the key in your request
    QCloudCredentialProvider myCredentialProvider = 
        new ShortTimeCredentialProvider(secretId, secretKey, 300);

    2. Initialize the COS service

    Use your myCredentialProvider instance that provides the key to initialize a CosXmlService instance.

    CosXmlService provides all APIs for accessing COS. We recommend you use it as an application singleton.

    // Bucket region abbreviation. For example, "ap-guangzhou" is the abbreviation of the Guangzhou region
    String region = "COS_REGION";
    
    // Create a `CosXmlServiceConfig` object and modify the default configuration parameters as needed
    CosXmlServiceConfig serviceConfig = new CosXmlServiceConfig.Builder()
            .setRegion(region)
            .isHttps(true) // Use the HTTPS request. HTTP is used by default
            .builder();
    
    // Initialize the COS service to obtain the instance
    CosXmlService cosXmlService = new CosXmlService(context, 
        serviceConfig, myCredentialProvider);

    Note:

    For more information on the abbreviations of the COS bucket regions, please see Regions and Access Endpoints.

    Using the KTX package to initialize the COS service

    If you use KTX, the simplified initialization code is as follows:

    val cos = cosService(context = application.applicationContext) {
    
        configuration {
            setRegion("ap-guangzhou")
            isHttps(true)
        }
    
        credentialProvider {
            lifecycleCredentialProvider {
                // Fetch credential from backend
                // ...
                return@lifecycleCredentialProvider SessionQCloudCredentials(
                        "temp_secret_id",
                        "temp_secret_key",
                        "session_token",
                        1556183496
                )
            }
        }
    }

    Step 4. Access COS

    Uploading an object

    The SDK supports uploading local files, binary data, URIs, and input streams. The following uses uploading a local file as an example.

    // Initialize TransferConfig. The default configuration is used here. To customize the configuration, please see the SDK API documentation.
    TransferConfig transferConfig = new TransferConfig.Builder().build();
    // Initialize TransferManager
    TransferManager transferManager = new TransferManager(cosXmlService,
            transferConfig);
    
    String bucket = "examplebucket-1250000000"; // Bucket, formatted as BucketName-APPID
    String cosPath = "exampleobject"; // Location identifier of the object in the bucket, also known as the object key
    String srcPath = new File(context.getCacheDir(), "exampleobject")
            .toString(); // Absolute path of the local file
    String uploadId = null; // If there is an uploadId for the initialized multipart upload, assign the value of uploadId here to resume the upload. Otherwise, assign null
    String uploadId = null; 
    
    // Upload a file
    COSXMLUploadTask cosxmlUploadTask = transferManager.upload(bucket, cosPath,
            srcPath, uploadId);
    
    // Set the upload progress callback
    cosxmlUploadTask.setCosXmlProgressListener(new CosXmlProgressListener() {
        @Override
        public void onProgress(long complete, long target) {
            // todo Do something to update progress...
        }
    });
    // Set the response callback
    cosxmlUploadTask.setCosXmlResultListener(new CosXmlResultListener() {
        @Override
        public void onSuccess(CosXmlRequest request, CosXmlResult result) {
            COSXMLUploadTask.COSXMLUploadTaskResult cOSXMLUploadTaskResult =
                    (COSXMLUploadTask.COSXMLUploadTaskResult) result;
        }
    
        @Override
        public void onFail(CosXmlRequest request,
                            CosXmlClientException clientException,
                            CosXmlServiceException serviceException) {
            if (clientException != null) {
                clientException.printStackTrace();
            } else {
                serviceException.printStackTrace();
            }
        }
    });
    // Set the job status callback to view the job progress
    cosxmlUploadTask.setTransferStateListener(new TransferStateListener() {
        @Override
        public void onStateChanged(TransferState state) {
            // todo notify transfer state
        }
    });

    Using the KTX package to upload an object

    If you use KTX, please refer to the following sample code for the upload:

    // Use the KTX extension of ViewModel
    // viewModelScope is the built-in coroutine scope of ViewModel
    viewModelScope.launch {
        val `object` = cosObject {
            bucket = cosBucket {
                service = cos
                name = "examplebucket-1250000000"
            }
            key = "exampleObject"
        }
        // Local sample file
        val sourceFile = File(appContext.externalCacheDir, "sourceFile")
    
        try {
            // Call the "suspend" function for upload
            val result = `object`.upload(
                localFile = sourceFile,
                progressListener = { complete, target ->
                    Log.d("cosxmlktx", "upload onProgress:" +
                                    " $complete / $target")
                },
                transferStateListener = { state ->
                    Log.d("cosxmlktx", "upload state is : $state")
                }
            )
    
        } catch (e : Exception ) {
            e.printStackTrace()
        }
    
    }

    Note:

    • For the complete sample, please visit GitHub.
    • After the upload, you can generate a download URL for the uploaded file with the same key. For detailed directions, please see Generating Pre-signed Links. Please note that for private-read files, the download URL is only valid for a limited period of time.

    Downloading an object

    // The advanced download API supports checkpoint restart. Therefore, a HEAD request will be sent before the download to obtain the file information.
    // If you are using a temporary key or accessing with a sub-account, ensure that your permission list includes HeadObject.
    
    // Initialize TransferConfig. The default configuration is used here. To customize the configuration, please see the SDK API documentation.
    TransferConfig transferConfig = new TransferConfig.Builder().build();
    // Initialize TransferManager
    TransferManager transferManager = new TransferManager(cosXmlService,
            transferConfig);
    
    String bucket = "examplebucket-1250000000"; // Bucket, formatted as BucketName-APPID
    String cosPath = "exampleobject"; // Location identifier of the object in the bucket, also known as the object key
    // Path of the local directory
    String savePathDir = context.getExternalCacheDir().toString();
    // File name saved locally. If not specified (null), it will be the same as the COS file name
    String savedFileName = "exampleobject";
    
    Context applicationContext = context.getApplicationContext(); // application
    // context
    COSXMLDownloadTask cosxmlDownloadTask =
            transferManager.download(applicationContext,
            bucket, cosPath, savePathDir, savedFileName);
    
    // Set the download progress callback
    cosxmlDownloadTask.setCosXmlProgressListener(new CosXmlProgressListener() {
        @Override
        public void onProgress(long complete, long target) {
            // todo Do something to update progress...
        }
    });
    // Set the response callback 
    cosxmlDownloadTask.setCosXmlResultListener(new CosXmlResultListener() {
        @Override
        public void onSuccess(CosXmlRequest request, CosXmlResult result) {
            COSXMLDownloadTask.COSXMLDownloadTaskResult cOSXMLDownloadTaskResult =
                    (COSXMLDownloadTask.COSXMLDownloadTaskResult) result;
        }
    
        @Override
        public void onFail(CosXmlRequest request,
                            CosXmlClientException clientException,
                            CosXmlServiceException serviceException) {
            if (clientException != null) {
                clientException.printStackTrace();
            } else {
                serviceException.printStackTrace();
            }
        }
    });
    // Set the job status callback to view the job progress
    cosxmlDownloadTask.setTransferStateListener(new TransferStateListener() {
        @Override
        public void onStateChanged(TransferState state) {
            // todo notify transfer state
        }
    });

    Using the KTX package to download an object

    If you use KTX, please refer to the following sample code for the download:

    // Use the KTX extension of ViewModel
    // viewModelScope is the built-in coroutine scope of ViewModel
    viewModelScope.launch {
        val `object` = cosObject {
            bucket = cosBucket {
                service = cos
                name = "examplebucket-1250000000"
            }
            key = "exampleObject"
        }
    
        try {
            // Call the "suspend" function for download
            val result = `object`.download(
                context = appContext,
                destDirectory = appContext.externalCacheDir!!,
                progressListener = { complete, target ->
                    Log.d("cosxmlktx", "download onProgress: " +
                            "$complete / $target")
                },
                transferStateListener = { state ->
                    Log.d("cosxmlktx", "download state is : $state")
                }
            )
    
        } catch (e : Exception ) {
            e.printStackTrace()
        }
    
    }

    Note:

    • For the complete sample, please visit GitHub.
    • The advanced download API supports checkpoint restart. Therefore, a HEAD request will be sent before the download to obtain the file information. If you are using a temporary key or accessing with a sub-account, ensure that your permission list includes HeadObject.

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