xUtils文件下载

//程序检查更新时，从服务器下载最新apk
private void download(final Context context){
//File sdCardFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath());
final File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath(), "/11AXP_PACKET_LastVer_dev.apk");
HttpUtils http = new HttpUtils();
HttpHandler handler = http.download("http://update.axpapp.com/appUpdate/downloadFile?filename=AXP_PACKET_LastVer_dev.apk",
file.getAbsolutePath(),
true, // 如果目标文件存在，接着未完成的部分继续下载。服务器不支持RANGE时将从新下载。
false, // 如果从请求返回信息中获取到文件名，下载完成后自动重命名。***这个比较重要，
new RequestCallBack<File>() {
@Override
public void onStart() {

Log.v("updateAPK", "conn...");
UpdateAppDialog.showDialog(SplashActivity.this, "正在更新程序", "正在更新程序", "", null);
}
@Override
public void onLoading(long total, long current, boolean isUploading) {

Log.v("updateAPK", current + "/" + total);
UpdateAppDialog.updateProgress((int)total/1024, (int)current/1024);
}
@Override
public void onSuccess(ResponseInfo<File> responseInfo) {

Log.v("updateAPK", responseInfo.result.getPath());
UpdateAppDialog.dissDialog();
CommandTools.install(file, context);
}
@Override
public void onFailure(HttpException error, String msg) {

Log.v("updateAPK", msg);
}
});
}