Android apk下载

//主要方法
 public void downloadApk(String downloadUrl) {
        clearApk(getString(R.string.app_name) + ".apk");
        //TODO 1.封装下载请求
        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(downloadUrl));
        request.setMimeType("application/vnd.android.package-archive");

//        //TODO 2.下载标题，描述
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        request.setTitle(getString(R.string.app_name));
        request.setDescription(getString(R.string.app_name) + "下载");
        // TODO 3.设置下载文件的保存位置
        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, getString(R.string.app_name) + ".apk");
        // TODO 4.获取下载管理器服务的实例, 添加下载任务
        DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
        manager.enqueue(request);// 将下载请求加入下载队列, 返回一个下载ID
    }

//清除重复的Apk防止重复下载
  public static File clearApk(String apkName) {
        File apkFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), apkName);
        if (apkFile.exists()) {
            apkFile.delete();
        }
        return apkFile;
    }