从链接下载并安装APK

我想从某个链接下载并安装一个apk,

但出于某种原因,我得到了一个例外。

我有一个方法downloadFile(),它下载文件并调用

to和installfile()方法,该方法应该在设备中安装它。

一些代码:

public void downloadFile()
{
    String fileName = "someApplication.apk";
    MsgProxyLogger.debug(TAG, "TAG:Starting to download");
    try
    {

        URL u = new URL(
                "http://10.122.233.22/test/someApplication.apk");

        try
        {
            HttpURLConnection c = (HttpURLConnection) u.openConnection();

            try
            {
                c.setRequestMethod("GET");
                c.setDoOutput(true);

                try
                {
                    c.connect();


                    FileOutputStream f = context.openFileOutput(fileName,
                            context.MODE_WORLD_READABLE);

                    try
                    {
                        InputStream in = c.getInputStream();

                        byte[] buffer = new byte[1024];
                        int len1 = 0;
                        int totsize = 0;
                        try
                        {
                            while ((len1 = in.read(buffer)) > 0)
                            {
                                totsize += len1;
                                f.write(buffer, 0, len1);// .write(buffer);
                            }
                        } catch (IOException e)
                        {
                            e.printStackTrace();
                        }
                        f.close();
                        MsgProxyLogger.debug(TAG, TAG
                                + ":Saved file with name: " + fileName);

                                    InstallFile(fileName);


                    } catch (IOException e)
                    {
                        e.printStackTrace();
                    }

                } catch (IOException e)
                {
                    e.printStackTrace();
                }

            } catch (ProtocolException e)
            {
                e.printStackTrace();
            }
        } catch (IOException e)
        {
            e.printStackTrace();
        }

    } catch (MalformedURLException e)
    {
        e.printStackTrace();
    }
}

这是安装文件方法:

 private void InstallFile(String fileName)
{
    MsgProxyLogger.debug(TAG, TAG + ":Installing file  " + fileName);

    String src = String.format(
            "file:///data/data/com.test/files/",
            fileName);

    Uri mPackageURI = Uri.parse(src);
    PackageManager pm = context.getPackageManager();

    int installFlags = 0;
    try
    {
        PackageInfo pi = pm.getPackageInfo("com.mirs.agentcore.msgproxy",
                PackageManager.GET_UNINSTALLED_PACKAGES);
        if (pi != null)
        {
            MsgProxyLogger.debug(TAG, TAG + ":replacing  " + fileName);

            installFlags |= PackageManager.REPLACE_EXISTING_PACKAGE;
        }
    } catch (NameNotFoundException e)
    {
    }

    try
    {
        // PackageInstallObserver observer = new PackageInstallObserver();
        pm.installPackage(mPackageURI);
    } catch (SecurityException e)
    {
                       //!!!!!!!!!!!!!here i get an security exception!!!!!!!!!!!
        MsgProxyLogger.debug(TAG, TAG + ":not permission?  " + fileName);
    }

这是异常详细信息: “用户10057和当前进程都没有android.permission.install_packages”。

我在我的主应用程序中设置了清单中的权限。

有人知道吗?

谢谢,

雷。