Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferenceAndroidObject InterfaceDownload ObjectResumable Download (Android SDK)
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Resumable Download (Android SDK)
Copy pageDownload PDFResumable Download (Android SDK)
When downloading large files, the downloadFile resumable download interface can be used. The TOS SDK enables concurrent segmented downloads of large files by utilizing the Range download method, and employs a local checkpoint mechanism to record successfully downloaded segments. If a download is interrupted due to network anomalies or machine failures, this interface may be invoked again to enable resumption.
Sample Code
The following code demonstrates how to perform resumable downloads of large objects.
import android.os.Bundle;
import android.util.Log;
import androidx.appcompat.app.AppCompatActivity;
import com.volcengine.tos.TOSV2;
import com.volcengine.tos.TOSV2ClientBuilder;
import com.volcengine.tos.TosException;
import com.volcengine.tos.model.object.DownloadFileInput;
import com.volcengine.tos.model.object.DownloadFileOutput;
import com.volcengine.tos.model.object.HeadObjectV2Input;
public class DownloadFileExample extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
String endpoint = "your endpoint";
String region = "your region";
String accessKey = "your access key";
String secretKey = "your secret key";
String securityToken = "your security token";
String bucketName = "your bucket name";
String objectKey = "your object key";
String downloadFilePath = "the path of file to download";
int taskNum = 5;
long partSize = 10 * 1024 * 1024;
boolean enableCheckpoint = true;
String checkpointFilePath = "the checkpoint file path";
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_message);
TOSV2 tos = new TOSV2ClientBuilder().build(region, endpoint, accessKey, secretKey, securityToken);
Thread tosThread = new Thread(new Runnable() {
@Override
public void run() {
try{
HeadObjectV2Input head = new HeadObjectV2Input().setBucket(bucketName).setKey(objectKey);
DownloadFileInput input = new DownloadFileInput().setHeadObjectV2Input(head)
.setFilePath(downloadFilePath).setEnableCheckpoint(enableCheckpoint)
.setCheckpointFile(checkpointFilePath).setPartSize(partSize).setTaskNum(taskNum);
DownloadFileOutput output = tos.downloadFile(input);
Log.i("downloadFile", "downloadFile succeed, object's etag is " + output.getOutput().getHeadObjectBasicOutput().getEtag());
Log.i("downloadFile", "downloadFile succeed, object's crc64 is " + output.getOutput().getHeadObjectBasicOutput().getHashCrc64ecma());
} catch (TosException e) {
Log.e("TosException","downloadFile failed");
e.printStackTrace();
}
}
});
tosThread.start();
}
}
Event Listening Functionality
During the invocation of the downloadFile interface, events such as creating temporary files, downloading file segments, and renaming temporary files are triggered. You can pass in a custom interface to monitor these download-related events and implement your own business logic.
The following code demonstrates how to utilize the event listener functionality.
import android.os.Bundle;
import android.util.Log;
import androidx.appcompat.app.AppCompatActivity;
import com.volcengine.tos.TOSV2;
import com.volcengine.tos.TOSV2ClientBuilder;
import com.volcengine.tos.TosException;
import com.volcengine.tos.comm.event.DownloadEventType;
import com.volcengine.tos.model.object.DownloadEvent;
import com.volcengine.tos.model.object.DownloadEventListener;
import com.volcengine.tos.model.object.DownloadFileInput;
import com.volcengine.tos.model.object.DownloadFileOutput;
import com.volcengine.tos.model.object.HeadObjectV2Input;
public class DownloadFileWithEventListenerExample extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
String endpoint = "your endpoint";
String region = "your region";
String accessKey = "your access key";
String secretKey = "your secret key";
String securityToken = "your security token";
String bucketName = "your bucket name";
String objectKey = "your object key";
String downloadFilePath = "the path of file to download";
int taskNum = 5;
long partSize = 10 * 1024 * 1024;
boolean enableCheckpoint = true;
String checkpointFilePath = "the checkpoint file path";
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_message);
TOSV2 tos = new TOSV2ClientBuilder().build(region, endpoint, accessKey, secretKey, securityToken);
Thread tosThread = new Thread(new Runnable() {
@Override
public void run() {
try{
HeadObjectV2Input head = new HeadObjectV2Input().setBucket(bucketName).setKey(objectKey);
DownloadEventListener listener = new DownloadEventListener() {
@Override
public void eventChange(DownloadEvent downloadEvent) {
if (downloadEvent.getDownloadEventType() == DownloadEventType.DownloadEventCreateTempFileSucceed) {
Log.i("downloadFile", "event change, createTempFile succeed");
}
if (downloadEvent.getDownloadEventType() == DownloadEventType.DownloadEventCreateTempFileFailed) {
Log.i("downloadFile", "event change, createTempFile failed");
}
if (downloadEvent.getDownloadEventType() == DownloadEventType.DownloadEventDownloadPartSucceed) {
Log.i("downloadFile", "event change, downloadPart succeed");
}
if (downloadEvent.getDownloadEventType() == DownloadEventType.DownloadEventDownloadPartFailed) {
Log.i("downloadFile", "event change, downloadPart failed");
}
if (downloadEvent.getDownloadEventType() == DownloadEventType.DownloadEventDownloadPartAborted) {
Log.i("downloadFile", "event change, downloadPart aborted");
}
if (downloadEvent.getDownloadEventType() == DownloadEventType.DownloadEventRenameTempFileSucceed) {
Log.i("downloadFile", "event change, renameTempFile succeed");
}
if (downloadEvent.getDownloadEventType() == DownloadEventType.DownloadEventRenameTempFileFailed) {
Log.i("downloadFile", "event change, renameTempFile failed");
}
}
};
DownloadFileInput input = new DownloadFileInput().setHeadObjectV2Input(head)
.setFilePath(downloadFilePath).setEnableCheckpoint(enableCheckpoint)
.setCheckpointFile(checkpointFilePath).setPartSize(partSize).setTaskNum(taskNum)
.setDownloadEventListener(listener);
DownloadFileOutput output = tos.downloadFile(input);
Log.i("downloadFile", "downloadFile succeed, object's etag is " + output.getOutput().getHeadObjectBasicOutput().getEtag());
Log.i("downloadFile", "downloadFile succeed, object's crc64 is " + output.getOutput().getHeadObjectBasicOutput().getHashCrc64ecma());
} catch (TosException e) {
Log.e("TosException","downloadFile failed");
e.printStackTrace();
}
}
});
tosThread.start();
}
}
Pause or Cancel Resumable Transfer
The downloadFile interface enables you to actively pause or cancel a resumable transfer task. Pausing a resumable download task will stop the download. When downloadFile is invoked again, the download can resume from the position where it was last paused. Canceling a resumable download task will stop the download and delete the local checkpoint file as well as any temporary files created during the download. If downloadFile is invoked again, the download will restart from the beginning.
The following code demonstrates how to pause or cancel a resumable transfer.
import android.os.Bundle;
import android.util.Log;
import androidx.appcompat.app.AppCompatActivity;
import com.volcengine.tos.TOSV2;
import com.volcengine.tos.TOSV2ClientBuilder;
import com.volcengine.tos.TosException;
import com.volcengine.tos.comm.event.DownloadEventType;
import com.volcengine.tos.model.object.DownloadEvent;
import com.volcengine.tos.model.object.DownloadEventListener;
import com.volcengine.tos.model.object.DownloadFileInput;
import com.volcengine.tos.model.object.DownloadFileOutput;
import com.volcengine.tos.model.object.HeadObjectV2Input;
public class DownloadFileWithCancelExample extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
String endpoint = "your endpoint";
String region = "your region";
String accessKey = "your access key";
String secretKey = "your secret key";
String securityToken = "your security token";
String bucketName = "your bucket name";
String objectKey = "your object key";
String downloadFilePath = "the path of file to download";
int taskNum = 5;
long partSize = 10 * 1024 * 1024;
boolean enableCheckpoint = true;
String checkpointFilePath = "the checkpoint file path";
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_message);
TOSV2 tos = new TOSV2ClientBuilder().build(region, endpoint, accessKey, secretKey, securityToken);
Thread tosThread = new Thread(new Runnable() {
@Override
public void run() {
try{
HeadObjectV2Input head = new HeadObjectV2Input().setBucket(bucketName).setKey(objectKey);
DownloadFileInput input = new DownloadFileInput().setHeadObjectV2Input(head)
.setFilePath(downloadFilePath).setEnableCheckpoint(enableCheckpoint)
.setCheckpointFile(checkpointFilePath).setPartSize(partSize).setTaskNum(taskNum);
boolean isAbort = true;
DownloadEventListener listener = new DownloadEventListener() {
@Override
public void eventChange(DownloadEvent downloadEvent) {
if (downloadEvent.getDownloadEventType() == DownloadEventType.DownloadEventDownloadPartFailed) {
Log.i("downloadFile", "event change, uploadPart failed");
if (input.getCancelHook() != null) {
input.getCancelHook().cancel(isAbort);
}
}
}
};
input.setCancelHook(true).setDownloadEventListener(listener);
DownloadFileOutput output = tos.downloadFile(input);
Log.i("downloadFile", "downloadFile succeed, object's etag is " + output.getOutput().getHeadObjectBasicOutput().getEtag());
Log.i("downloadFile", "downloadFile succeed, object's crc64 is " + output.getOutput().getHeadObjectBasicOutput().getHashCrc64ecma());
} catch (TosException e) {
Log.e("TosException","downloadFile failed");
e.printStackTrace();
}
}
});
tosThread.start();
}
}
Last updated: 2025.09.25 14:23:26
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