Android备份App及数据

private void backupApp(String packageName) throws IOException {

File in = new File("/data/app/" + packageName + ".apk");
File out = new File("/sdcard/BackupApp/" + packageName + ".apk");
out.createNewFile();
FileInputStream fis = new FileInputStream(in);
FileOutputStream fos = new FileOutputStream(out);

int count;
byte[] buffer = new byte[256 * 1024];
while ((count = fis.read(buffer)) > 0) {
fos.write(buffer, 0, count);
}

fis.close();
fos.flush();
fos.close();
}