(Android™) S3 Get Bucket Objects with CommonPrefixes

Demonstrates how to get a list of bucket objects using the prefix and delimiter query params to get an XML result with CommonPrefixes.

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 assumes the Chilkat HTTP API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();

    // Insert your access key here:
    http.put_AwsAccessKey("AWS_ACCESS_KEY");

    // Insert your secret key here:
    http.put_AwsSecretKey("AWS_SECRET_KEY");

    // In this example, my bucket is "chilkat100".
    // It contains a number of folders, one of which is named "images".
    // I want to get a list of all sub-folders under the "images" folder
    String strXml = http.s3_ListBucketObjects("chilkat100?prefix=images/&delimiter=/");
    if (http.get_LastMethodSuccess() != true) {
        Log.i(TAG, http.lastErrorText());
        return;
        }

    Log.i(TAG, "Response status code = " + String.valueOf(http.get_LastStatus()));

    CkXml xml = new CkXml();
    boolean success = xml.LoadXml(strXml);
    if (success != true) {
        Log.i(TAG, xml.lastErrorText());
        return;
        }

    // If the response status code was not 200, then the XML response is not a 
    // listing of objects, but instead contains error information.
    if (http.get_LastStatus() != 200) {
        Log.i(TAG, xml.getXml());
        Log.i(TAG, "Failed.");
        return;
        }

    // A sample response is shown below.
    Log.i(TAG, xml.getXml());
    Log.i(TAG, "----");

    // Here is the list of sub-folders (i.e. CommonPrefixes)

    // <?xml version="1.0" encoding="UTF-8"?>
    // <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    //     <Name>chilkat100</Name>
    //     <Prefix>images/</Prefix>
    //     <Marker/>
    //     <MaxKeys>1000</MaxKeys>
    //     <Delimiter>/</Delimiter>
    //     <IsTruncated>false</IsTruncated>
    //     <CommonPrefixes>
    //         <Prefix>images/africa/</Prefix>
    //     </CommonPrefixes>
    //     <CommonPrefixes>
    //         <Prefix>images/sea_creatures/</Prefix>
    //     </CommonPrefixes>
    // </ListBucketResult>

    String Prefix;

    // The XML can be parsed like this:
    int i = 0;
    int count_i = xml.NumChildrenHavingTag("CommonPrefixes");
    while (i < count_i) {
        xml.put_I(i);
        Prefix = xml.getChildContent("CommonPrefixes[i]|Prefix");
        Log.i(TAG, "Prefix = " + Prefix);
        i = i + 1;
        }


  }

  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."
  }
}