Android™

Q-Encode a String for MIME Headers

Demonstrates the Chilkat Email.QEncodeString method, which converts the Unicode string in the first argument to the charset named in the second argument, Q-encodes the resulting multibyte data, and returns the encoded string. This is one of the representations used for non-ASCII text in MIME header fields.

Background: RFC 2047 defines two "encoded-word" schemes for putting non-ASCII text in headers: B (Base64) and Q (quoted-printable-style). Q-encoding leaves plain ASCII mostly readable and escapes only the special bytes, producing output like =?utf-8?Q?Caf=C3=A9?=. It is the better choice when text is mostly ASCII with a few accented characters, whereas B-encoding (BEncodeString) is more compact when most characters are non-ASCII.

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// 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);

    //  Demonstrates the QEncodeString method, which converts a Unicode string to a specified
    //  charset, Q-encodes (RFC 2047) the resulting bytes, and returns the encoded string.
    //  This is one of the forms used for non-ASCII text in MIME header fields.

    CkEmail email = new CkEmail();

    //  Q-encode a Unicode string using the utf-8 charset.
    String encoded = email.qEncodeString("Cafe Meeting Notes","utf-8");

    Log.i(TAG, "Q-encoded: " + encoded);

  }

  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."
  }
}