java - Android:不是文件 URI:下载 .apk 文件时

Question

我想下载 .apk 文件并安装它。当我不使用 FileProvider 时，一切顺利，但是当我使用 FileProvider 从文件创建 uri 时，我遇到了 IllegalArgumentException:不是文件 URI:content://pl.rasztabiga.klasa1a.provider/external_storage_root/klasa1a。 apk上线

final long downloadId = manager.enqueue(request);

我尝试了 stackoverflow 中的所有方法，但没有任何帮助。这是我的代码:

File file = new File(Environment.getExternalStorageDirectory(), "klasa1a.apk");
final Uri uri = FileProvider.getUriForFile(MainActivity.this, getApplicationContext().getPackageName() + ".provider", file);

        //Delete update file if exists
        //File file = new File(destination);
        if (file.exists())
            file.delete();

        //get url of app on server
        String url = "http://rasztabiga.ct8.pl/klasa1a.apk";

        //set downloadmanager
        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
        request.setDescription("Downloading new version");
        request.setTitle(MainActivity.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.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                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));

Answer 1

ACTION_VIEW 和 ACTION_INSTALL_PACKAGE 仅支持自 Android 7.0 起的 content 方案。在此之前，您别无选择，只能使用 file。所以，改变:

final Uri uri = FileProvider.getUriForFile(MainActivity.this, getApplicationContext().getPackageName() + ".provider", file);

到:

final Uri uri = (Build.VERSION.SDK_INT>=Build.VERSION_CODES.N) ?
    FileProvider.getUriForFile(MainActivity.this, BuildConfig.APPLICATION_ID + ".provider", file) :
    Uri.fromFile(file);