下载并安装由内部存储器中的应用（APK） - 没有SD卡 [英] Download and install an application (apk) from internal memory - no SD card

问题描述

问候和新年快乐我的所有同事的程序员。

Greetings and a happy new year to all my fellow programmers.

我的code下载从远程服务器上的apk文件。我需要启动到code中的安装过程，而无需显式地安装它的用户。美中不足的是，我不能使用SD卡下载apk文件。

My code downloads an apk file from a remote server. I need to initiate the installation procedure through code, without user having to explicitly install it. The catch is that i cannot use an SD card download the apk file.

我可以导航到数据/数据​​/文件夹，可以看到我的文件下载。唯一的问题是，我不能把它安装。这就是我得到

I can navigate to the data/data/files folder and can see my file downloaded. The only problem is that i cannot get it installed. This is what i get

 '/data/data/org.obs.testinstall.main/files/app.apk': Permission denied 

据我所知，Android不给权限访问数据目录。 我的问题是我如何可以下载并无需使用SD卡安装应用程序（APK）。本申请并不意在发表在市场。我曾经同时使用内部存储使用尝试

I understand that Android does not give permission to access the data directory. My question is how can i download and install an application(apk) without using a SD card. This application is not intended to be published in the market. I have tried using both the Internal Storage using

FileOutputStream fos = openFileOutput("app.apk", Context.MODE_PRIVATE);

和缓存目录

File file = getCacheDir();
File outputFile = new File(file, "app.apk");

均可以得到相同的结果。权限被拒绝

Both give the same result .. "Permission denied"

当我改变code纳入SD卡的应用程序完美的作品，但使用的是SD卡是不是一种选择。

When i change the code to incorporate an SD card the application works perfectly, but using an SD card is not an option.

当然必须有办法做到这一点。这是很难相信，这样的障碍存在于Android的O / S。

Surely there must be a way to do this. It is hard to believe that such a handicap exist in the Android O/S.

有没有人这样做呢？任何解决办法？任何指针将是有益的。

Has anybody done this? Any workarounds? Any pointers would be helpful.

推荐答案

据其造成的Andr​​oid应用程序无法读取 如果使用专用模式编写了另一个应用程序文件。

It it caused by android application can not read from another application file if it is written using PRIVATE mode.

您可以这样做：

String fileName = "tmp.apk";
FileOutputStream fos = openFileOutput(fileName,
        MODE_WORLD_READABLE | MODE_WORLD_WRITEABLE);

// write the .apk content here ... flush() and close()

// Now start the standard instalation window
File fileLocation = new File(context.getFilesDir(), fileName);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(fileLocation),
                       "application/vnd.android.package-archive");
context.startActivity(intent);

不过要小心，因为该文件现在是世界上可见， 并且可以通过在相同的设备中的任何应用中可以看出， 如果他们知道该文件的位置。

Be careful though, because that file is now world-visible, and can be seen by any application in the same device, if they know the file location.

这篇关于下载并安装由内部存储器中的应用（APK） - 没有SD卡的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！