(Android™) Download File from Dropbox into a String Variable

Demonstrates how to download a file from Dropbox directly into a string variable.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// 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);

    // 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.

    CkRest rest = new CkRest();

    // Connect to Dropbox
    boolean success = rest.Connect("content.dropboxapi.com",443,true,true);
    if (success != true) {
        Log.i(TAG, rest.lastErrorText());
        return;
        }

    // 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": "/jack.txt",
    // }

    CkJsonObject json = new CkJsonObject();
    json.AppendString("path","/jack.txt");
    rest.AddHeader("Dropbox-API-Arg",json.emit());

    // The content of the file on Dropbox is returned.
    String fileContent = rest.fullRequestNoBody("POST","/2/files/download");
    if (rest.get_LastMethodSuccess() != true) {
        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): " + fileContent);
        Log.i(TAG, "---");
        Log.i(TAG, "LastRequestStartLine: " + rest.lastRequestStartLine());
        Log.i(TAG, "LastRequestHeader: " + rest.lastRequestHeader());
        return;
        }

    // Show the file content that was downloaded:
    Log.i(TAG, fileContent);
    Log.i(TAG, "----");

    // 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": "jack.txt",
    //   "path_lower": "/jack.txt",
    //   "path_display": "/jack.txt",
    //   "id": "id:yqx4-tE_NKAAAAAAAAAAAQ",
    //   "client_modified": "2016-06-02T20:42:11Z",
    //   "server_modified": "2016-06-02T20:42:11Z",
    //   "rev": "8482db15f",
    //   "size": 42
    // }

    // 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 = ckdt.GetDtObj(bLocalTime);
    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."
  }
}