Android™

Fetch Web Pages from Local Cache

See more HTTP Examples

Demonstrates how to keep a local cache to avoid re-fetching web pages. 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);

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

    CkHttp http = new CkHttp();

    //  Define a cache directory and set the number of levels based on the anticipated size of the cache.
    http.AddCacheRoot("c:/example/httpCache/");

    //  up to 256 sub-directories under the cache root will be created as needed to hold cached GET's.
    http.put_NumCacheLevels(1);

    //  Tell the http object to fetch from the cache if possible.
    http.put_FetchFromCache(true);

    //  Also tell the http object to update the cache with newly fetched pages.
    http.put_UpdateCache(true);

    //  This HTTP GET should result in a cache file getting created.
    String html = http.quickGetStr("https://www.google.com/");
    if (http.get_LastMethodSuccess() == false) {
        Log.i(TAG, http.lastErrorText());
        return;
        }

    //  The 1st GET was not from cache:
    Log.i(TAG, "Fetched from cache: " + String.valueOf(http.get_LastFromCache()));

    //  Fetching again will cause the page to be delivered from our local cache.
    html = http.quickGetStr("https://www.google.com/");
    if (http.get_LastMethodSuccess() == false) {
        Log.i(TAG, http.lastErrorText());
        return;
        }

    //  The 2nd GET is from cache:
    Log.i(TAG, "Fetched from cache: " + String.valueOf(http.get_LastFromCache()));

  }

  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."
  }
}