apk get package 명

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class APKAnalyzer {
private static int bufferSize = 4096;
public static void main(String[] args) throws Exception {
System.out.println( findPackageNameFromAPK("c:/sample/1.apk") );
}

private static String findPackageName( String str )
{
int index1 = str.indexOf("manifest") + "manifest".length();
int index2 = str.indexOf("application");

if( index1 == -1 || index2 == -1 ) return null;

boolean isStart = false, isFinish = false;
for( int i = index1 ; i < index2 ; i++ )
{
isFinish = true;
char d = str.charAt(i);
//패턴은 되도록 쓰지말라는 권고에 따라서 아스키값으로 비교
if( 46 <= d && d <= 122 )
{
isStart = true;
isFinish = false;
}

if( isStart == false ) index1++;
if( isStart && isFinish) {
index2 = i;
break;
}
}
return str.substring(index1, index2);
}

public static String findPackageNameFromAPK( String path ) throws IOException
{
FileInputStream fis = new FileInputStream(path);
ZipInputStream zis = new ZipInputStream(fis);

ZipEntry zentry;
String fileName;
String packageName = null;
while( (zentry = zis.getNextEntry()) != null )
{
fileName = zentry.getName();
if( zentry.getName().equalsIgnoreCase("AndroidManifest.xml") )
{
BufferedInputStream bis = new BufferedInputStream( zis );
int c = 0;
int b = 0xFFFFFFFF ;


byte[] buffer1 = new byte[bufferSize];
byte[] buffer2 = new byte[bufferSize];

int cnt1=0, cnt2=0;
while( (c = bis.read()) != -1 )
{
if ( ( b ^= 0xFFFFFFFF ) == 0)
{
buffer1[cnt1++] = (byte)c;
}
else
{
buffer2[cnt2++] = (byte)c;
}

if( cnt1 == bufferSize || cnt2 == bufferSize  ) break;
}

String str1 = new String( buffer1 );

if((packageName = findPackageName(str1)) != null )
{
break;
}
String str2 = new String( buffer2 );
packageName = findPackageName(str2);
break;
}
}
return packageName;

}
}