这个呢 不是我弄的只是看到的，只是用作者的话说 如果别人真想知道怎么加密都是虚的
只是为了不让简单的从sd卡内直接看到而已
原理就是自己写一个流通过与或 简单转一下而已
File assets = new File(Environment.getExternalStorageDirectory(),"assets");
ZipInputStream zip = new ZipInputStream(new TranslateInputStream(assets));
然后就是关键的
private static final byte MAGIC_NUMBER = 13;
private void translateBuffer(byte[] buffer) {
for (int i = 0;i < buffer.length;i++) {
buffer[i] ^= MAGIC_NUMBER;
}
}
private class TranslateOutputStream extends FileOutputStream {
public TranslateOutputStream(File file) throws FileNotFoundException {
super(file);
}
@Override
public void write(int oneByte) throws IOException {
oneByte ^= MAGIC_NUMBER;
super.write(oneByte);
}
//In Android write(byte[]) calls this method so we don't need to override both
@Override
public void write(byte[] buffer, int offset, int count)
throws IOException {
translateBuffer(buffer);
super.write(buffer, offset, count);
}
}
private class TranslateInputStream extends FileInputStream {
public TranslateInputStream(File file) throws FileNotFoundException {
super(file);
}
@Override
public int read() throws IOException {
return super.read() ^ MAGIC_NUMBER;
}
//In Android read(byte[]) calls this method so we don't need to override both
@Override
public int read(byte[] buffer, int offset, int count)
throws IOException {
int bytesRead = super.read(buffer, offset, count);
translateBuffer(buffer);
return bytesRead;
}
}
