Android 自动安装 APK

Question

我有一个 webview，它基本上能够拦截各种链接、视频、apks、hrefs。

现在，我想要的是一旦我从 url 下载 APK，它就会自动安装:

这是 shouldOverrideUrlLoading() 代码的一部分:

        else if(url.endsWith(".apk")) 
        {
        mWebView.setDownloadListener(new DownloadListener() {
                    public void onDownloadStart(final String url, String userAgent,
                    String contentDisposition, String mimetype,
                    long contentLength) {   
                    }
                    });
        Intent intent = new Intent(Intent.ACTION_VIEW ,Uri.parse(url));
        startActivity(intent);  
        return true;

如果我添加

intent.setDataAndType(Uri.parse(url), "application/vnd.android.package-archive");

比应用程序崩溃...

有什么想法吗？

编辑:我能够自动启动包的下载和安装(使用 sleep() ):

        else if(url.endsWith(".apk")) 
        {
        mWebView.setDownloadListener(new DownloadListener() {
                    public void onDownloadStart(final String url, String userAgent,
                    String contentDisposition, String mimetype,
                    long contentLength) {   
                    }
                    });
        Intent intent = new Intent(Intent.ACTION_VIEW ,Uri.parse(url));
        startActivity(intent); 
        String fileName = Environment.getExternalStorageDirectory() + "/download/" + url.substring( url.lastIndexOf('/')+1, url.length() );
        install(fileName);
        return true;

并且，正如 vitamoe 所建议的那样:

protected void install(String fileName) {
    Intent install = new Intent(Intent.ACTION_VIEW);
    install.setDataAndType(Uri.fromFile(new File(fileName)),
            "application/vnd.android.package-archive");
    startActivity(install);
}

但是，我无法捕获下载完成的确切时间，可能需要创建我自己的下载功能而不是使用浏览器的功能，有什么想法吗？

Answer 1

要在没有浏览器的情况下下载文件，请执行某项操作。像这样:

String apkurl = "http://your.url.apk";
InputStream is;
try {
    URL url = new URL(apkurl);
    HttpURLConnection con = (HttpURLConnection) url.openConnection();
    con.setRequestMethod("GET");
    con.setDoOutput(true);
    con.connect();
    is = con.getInputStream();
} catch (SSLException e) {
    // HTTPS can end in SSLException "Not trusted server certificate"
}

// Path and File where to download the APK
String path = Environment.getExternalStorageDirectory() + "/download/";
String fileName = apkurl.substring(apkurl.lastIndexOf('/') + 1);
File dir = new File(path);
dir.mkdirs(); // creates the download directory if not exist
File outputFile = new File(dir, fileName);
FileOutputStream fos = new FileOutputStream(outputFile);

// Save file from URL to download directory on external storage
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1) {
    fos.write(buffer, 0, len);
}
fos.close();
is.close();

// finally, install the downloaded file
install(path + fileName);