PROSAGA码农传奇-应用市场-Android：以编程方式安装.apk [重复]

我在Android下载二进制文件问题 并在Android上以编程方式安装应用程序的帮助下做到了这一点 。我想立即进行自动更新和自动安装。它是本地的，因此是非市场应用程序。这是我的代码：
<pre><code>public void Update(String apkurl){
 try {
 URL url = new URL(apkurl);
 HttpURLConnection c = (HttpURLConnection) url.openConnection();
 c.setRequestMethod("GET");
 c.setDoOutput(true);
 c.connect();

String PATH = Environment.getExternalStorageDirectory() + "/download/";
        File file = new File(PATH);
        file.mkdirs();
        File outputFile = new File(file, "app.apk");
        FileOutputStream fos = new FileOutputStream(outputFile);

InputStream is = c.getInputStream();

byte[] buffer = new byte[1024];
        int len1 = 0;
        while ((len1 = is.read(buffer)) != -1) {
            fos.write(buffer, 0, len1);
        }
        fos.close();
        is.close();//till here, it works fine - .apk is download to my sdcard in download file

Intent promptInstall = new Intent(Intent.ACTION_VIEW)
            .setData(Uri.parse(PATH+"app.apk"))
            .setType("application/android.com.app");
        startActivity(promptInstall);//installation is not working

} catch (IOException e) {
 Toast.makeText(getApplicationContext(), "Update error!", Toast.LENGTH_LONG).show();
 }
} 
</code></pre>我的权限是INTERNET，WRITE_EXTERNAL_STORAGE，INSTALL_PACKAGES，和DELETE_PACKAGES。promptInstall加载Intent后，应用程序崩溃= /那么，我是缺少权限还是代码不正确，或者有更好的方法来执行此操作？

我解决了问题。我在setData(Uri)和中犯了错误setType(String)。

```
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory() + "/download/" + "app.apk")), "application/vnd.android.package-archive");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
```

现在是正确的，我的自动更新正在运行。感谢帮助。=）

编辑20.7.2016：

过了很长时间，我不得不在另一个项目中再次使用这种更新方式。我在使用旧解决方案时遇到了许多问题。那个时候很多事情都发生了变化，所以我不得不用另一种方法来做到这一点。这是代码：

```
    //get destination to update file and set Uri
    //TODO: First I wanted to store my update .apk file on internal storage for my app but apparently android does not allow you to open and install
    //aplication with existing package from there. So for me, alternative solution is Download directory in external storage. If there is better
    //solution, please inform us in comment
    String destination = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "/";
    String fileName = "AppName.apk";
    destination += fileName;
    final Uri uri = Uri.parse("file://" + destination);

//Delete update file if exists
    File file = new File(destination);
    if (file.exists())
    //file.delete() - test this, I think sometimes it doesnt work
        file.delete();

//get url of app on server
    String url = Main.this.getString(R.string.update_app_url);

//set downloadmanager
    DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
    request.setDescription(Main.this.getString(R.string.notification_description));
    request.setTitle(Main.this.getString(R.string.app_name));

//set destination
    request.setDestinationUri(uri);

// get download service and enqueue file
    final DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
    final long downloadId = manager.enqueue(request);

//set BroadcastReceiver to install app when .apk is downloaded
    BroadcastReceiver onComplete = new BroadcastReceiver() {
        public void onReceive(Context ctxt, Intent intent) {
            Intent install = new Intent(Intent.ACTION_VIEW);
            install.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            install.setDataAndType(uri,
                    manager.getMimeTypeForDownloadedFile(downloadId));
            startActivity(install);

unregisterReceiver(this);
            finish();
        }
    };
    //register receiver for when .apk download is compete
    registerReceiver(onComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
```