android 图片转base64 OOM

OOM异常，请问各位大师有什么解决办法？

OOM截图：

private String encode(String path) {

    Bitmap bitmap = null;
   bitmap = BitmapFactory.decodeFile(path);

    //convert to byte array
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
    byte[] src = baos.toByteArray();

    StringBuilder sb = new StringBuilder();
    int bufsize = 128;
    byte[] dst = new byte[bufsize];
    int toread = 0;
    int totalread = 0; //读取字节
    while (totalread < src.length) {
        if (src.length - totalread >= bufsize) //剩余大小>bufsize
        {
            toread = bufsize;
        } else {
            toread = src.length - totalread;
        }
        System.arraycopy(src, totalread, dst, 0, toread);
        totalread +=toread;
        sb.append(android.util.Base64.encodeToString(dst, 0, toread, Base64.DEFAULT));
       // Log.v("base64",android.util.Base64.encodeToString(dst, 0, toread, Base64.DEFAULT));

    }
    //base64 encode
    // byte[] encode = android.util.Base64.encode(bytes, Base64.DEFAULT);
    //return  new String(encode);
    return sb.toString();//encode;

}

Bitmap bitmap = BitmapFactory.decodeFile(path);
//convert to byte array
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
byte[] bytes = baos.toByteArray();

//base64 encode
byte[] encode = Base64.encode(bytes,Base64.DEFAULT);
String encodeString = new String(encode);

http://wiki.jikexueyuan.com/project/android-actual-combat-skills/picture-basesixtyfour-coding-and-decoding.html
http://blog.csdn.net/h7870181/article/details/19971557
http://outofmemory.cn/code-snippet/36105/java-image-base64