GZip in Android

Question

So komprimieren und dekomprimieren Sie eine Datei in Android mit GZip. Bitte geben Sie etwas an, damit es mir eine große Hilfe ist.

Vielen Dank im Voraus

Answer 1

prüfen GZIPInputStream und GZIPOutputStream aus.

Answer 2

Ich stieß vor einiger Zeit auf dasselbe Problem. Hier werden die Funktionen i

Compress Funktion

if (responseCode == HttpConnection.HTTP_OK){

boolean stop = false, pause = false; 
totalSize = conn.getLength() + downloaded; 
chunkSize = (int)(conn.getLength()/100); 
System.out.println("*********-----" + conn.getLength() + ""); 
System.out.println("-----------------ok"); 
in = conn.openInputStream(); 
int length = 0, s = 0; 
byte[] readBlock = new byte[(int)conn.getLength()]; 


while ((s = in.read(readBlock) != -1) 
     length = length + s; 
{ 
     if (!pause) 
     { 
      readBlock = Decompress.decompress(readBlock); 
      out.write(readBlock, 0, length); 
      downloaded += length; 
      int a = getPerComplete(totalSize, downloaded); 
      System.out.println("% OF Downloaded--------" + a); 
      int a1 = getPerComplete(totalSize, downloaded); 

Dekomprimieren-Funktion: -

public byte[] decompress(byte[] compressed) throws IOException 
{ 
    GZIPInputStream gzipInputStream; 
    if (compressed.length > 4) 
    { 
     gzipInputStream = new GZIPInputStream(
      new ByteArrayInputStream(compressed, 4, 
            compressed.length - 4)); 

     ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
     for (int value = 0; value != -1;) 
     { 
      value = gzipInputStream.read(); 
      if (value != -1) 
      { 
       baos.write(value); 
      } 
     } 
     gzipInputStream.close(); 
     baos.close(); 

     return baos.toByteArray(); 
    } 
    else 
    { 
     return null; 
    } 
} 

}

Answer 3

Bitte verwenden Sie die folgenden Methoden, um die Zeichenfolge zu komprimieren mit gzip.

public static byte[] compress(String string) throws IOException { 
    ByteArrayOutputStream os = new ByteArrayOutputStream(string.length()); 
    GZIPOutputStream gos = new GZIPOutputStream(os); 
    gos.write(string.getBytes()); 
    gos.close(); 
    byte[] compressed = os.toByteArray(); 
    os.close(); 
    return compressed; 
} 

public static String decompress(byte[] compressed) throws IOException { 
    final int BUFFER_SIZE = 32; 
    ByteArrayInputStream is = new ByteArrayInputStream(compressed); 
    GZIPInputStream gis = new GZIPInputStream(is, BUFFER_SIZE); 
    StringBuilder string = new StringBuilder(); 
    byte[] data = new byte[BUFFER_SIZE]; 
    int bytesRead; 
    while ((bytesRead = gis.read(data)) != -1) { 
     string.append(new String(data, 0, bytesRead)); 
    } 
    gis.close(); 
    is.close(); 
    return string.toString(); 
}