Android DownloadManager-下载并安装APK

Question

我到处都在寻找如何下载不是从市场上下载的APK。 APK已存储在我的服务器中。 所有样本均无效。

我希望我的应用为我的服务器下载一个APK，并提示用户安装它。

到目前为止，我设法将apk下载到用户sd上。 但我无法知道他的路径在哪里保存并开始安装。

private void downloadAPK() {
    String url="https://www.example.com/app.apk”;
    downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
    request = new Request(Uri.parse(url));
    request.setTitle(“My App“);
    enqueue = downloadManager.enqueue(request);


      new Thread(new Runnable() {

        @Override
        public void run() {

            boolean downloading = true;

            while (downloading) {

                try {
                    Thread.sleep(10000);
                     DownloadManager.Query q = new DownloadManager.Query();
                        q.setFilterById(enqueue);

                        Cursor cursor = downloadManager.query(q);
                        cursor.moveToFirst();
                        int bytes_downloaded = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
                        int bytes_total = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));

                        if (cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS)) == DownloadManager.STATUS_SUCCESSFUL) {
                            downloading = false;
                        }

                        final int dl_progress = (int) ((double)bytes_downloaded / (double)bytes_total * 100f);

                        runOnUiThread(new Runnable() {

                            @Override
                            public void run() {

                                Log.d("Prog", Integer.toString(dl_progress));
                            }
                        });


                        cursor.close();
                } catch (InterruptedException e) {

                }

            }

        }
    }).start();
}}


BroadcastReceiver receiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();


        if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
             Log.w(“”, “Downloaded”)

        }
        else {
            //do something here
       }

    }
};


onCreate ...
registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));

Answer 1

根据文档，您可以指定要保存文件的位置。 您所要做的就是在将请求设置为DownloadManager之前添加此行：

request.setDestinationInExternalFilesDir (context, dirType, subPath);

Answer 2

您可以使用以下代码查询下载的本地文件：

请注意：如果下载失败，将返回null。

String path = Uri.parse(cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI))).getPath()