Android™

REST Download Bandwidth Throttle

See more REST Examples

Demonstrates how to use download bandwidth throttling with the REST API. This example will download a file from Drobox using a file stream, with a limit on the bandwidth that can be used for the transfer. Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // A Dropbox access token should have been previously obtained.
    // Dropbox access tokens do not expire.
    // See Dropbox Access Token.

    // To use bandwidth throttling, the connection should be made using the socket API.
    // This provides numerous properties to customize the connection, such as
    // BandwidthThrottleDown, BandwidthThrottleUp, ClientIpAddress, ClintPort, Http Proxy,
    // KeepAlive, PreferIpv6, RequireSslCertVerify, SoRcvBuf, SoSndBuf, SoReuseAddr,
    // SOCKS proxy, TcpNoSDelay, TlsPinSet, TlsCipherSuite, SslAllowedCiphers, etc.

    CkSocket socket = new CkSocket();
    int maxWaitMs = 5000;
    success = socket.Connect("content.dropboxapi.com",443,true,maxWaitMs);
    if (success != true) {
        Log.i(TAG, socket.lastErrorText());
        Log.i(TAG, "Connect Fail Reason: " + String.valueOf(socket.get_ConnectFailReason()));
        return;
        }

    // Set the download bandwidth throttle rate to 50000 bytes per second.
    socket.put_BandwidthThrottleDown(50000);

    CkRest rest = new CkRest();

    // Tell the REST object to use the connected socket.
    rest.UseConnection(socket,true);

    // The remainder of this example is identical to the example at:
    // Dropbox Download File.

    // Add request headers.
    rest.AddHeader("Authorization","Bearer DROPBOX_ACCESS_TOKEN");

    // The download "parameters" are contained in JSON passed in an HTTP request header.
    // This is the JSON indicating the file to be downloaded:
    // { 
    //    "path": "/Homework/lit/hamlet.xml",
    // }

    CkJsonObject json = new CkJsonObject();
    json.AppendString("path","/Homework/lit/hamlet.xml");
    rest.AddHeader("Dropbox-API-Arg",json.emit());

    // Setup a file stream for the download
    CkStream fileStream = new CkStream();
    fileStream.put_SinkFile("qa_output/hamletFromDropbox.xml");

    // Indicate that the call to FullRequestNoBody should send the response body
    // to fileStream if the response status code is 200.
    // If a non-success response status code is received, then nothing
    // is streamed to the output file and the error response is returned by FullRequestNoBody.
    int expectedStatus = 200;
    rest.SetResponseBodyStream(expectedStatus,true,fileStream);

    String responseStr = rest.fullRequestNoBody("POST","/2/files/download");
    if (rest.get_LastMethodSuccess() == false) {
        Log.i(TAG, rest.lastErrorText());
        return;
        }

    // When successful, Dropbox responds with a 200 response code.
    if (rest.get_ResponseStatusCode() != 200) {
        // Examine the request/response to see what happened.
        Log.i(TAG, "response status code = " + String.valueOf(rest.get_ResponseStatusCode()));
        Log.i(TAG, "response status text = " + rest.responseStatusText());
        Log.i(TAG, "response header: " + rest.responseHeader());
        Log.i(TAG, "response body (if any): " + responseStr);
        Log.i(TAG, "---");
        Log.i(TAG, "LastRequestStartLine: " + rest.lastRequestStartLine());
        Log.i(TAG, "LastRequestHeader: " + rest.lastRequestHeader());
        return;
        }

    // Information about the downloaded file is also available as JSON in a response header.
    // The "dropbox-api-result" response header contains the information.  For example:
    String apiResult = rest.responseHdrByName("dropbox-api-result");
    Log.i(TAG, apiResult);

    // In this case, the pretty-formatted dropbox-api-result JSON looks like this:
    // { 
    //   "name": "hamlet.xml",
    //   "path_lower": "/homework/lit/hamlet.xml",
    //   "path_display": "/Homework/lit/hamlet.xml",
    //   "id": "id:74FkdeNuyKAAAAAAAAAAAQ",
    //   "client_modified": "2016-06-02T23:19:00Z",
    //   "server_modified": "2016-06-02T23:19:00Z",
    //   "rev": "9482db15f",
    //   "size": 279658
    // }

    // Load the JSON, pretty-print it, and demonstrate how to get some values...
    CkJsonObject jsonResult = new CkJsonObject();
    jsonResult.put_EmitCompact(false);
    jsonResult.Load(apiResult);
    // Show the JSON pretty-printed...
    Log.i(TAG, jsonResult.emit());

    // Sample code to get data from the JSON response:
    int size = jsonResult.IntOf("size");
    Log.i(TAG, "size = " + String.valueOf(size));

    String rev = jsonResult.stringOf("rev");
    Log.i(TAG, "rev = " + rev);

    String clientModified = jsonResult.stringOf("client_modified");
    CkDateTime ckdt = new CkDateTime();
    ckdt.SetFromTimestamp(clientModified);
    boolean bLocalTime = true;
    CkDtObj dt = new CkDtObj();
    ckdt.ToDtObj(bLocalTime,dt);

    Log.i(TAG, String.valueOf(dt.get_Day()) + "/" + String.valueOf(dt.get_Month()) + "/" + String.valueOf(dt.get_Year())
         + " " + String.valueOf(dt.get_Hour()) + ":" + String.valueOf(dt.get_Minute()));

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}