Question

我的应用程序是关于带有recycleview的列表，您可以在其中选择文件并单击下载按钮，然后打开一个webview，开始下载该文件。

我的应用程序适合我，但我注意到有些用户无法下载这些文件，而是使用他们拥有的默认媒体播放器自动打开。无论如何，当我能阻止它时？请查看webview类的代码：

private WebView webView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.webview);

    webView = (WebView) findViewById(R.id.webview);

    webView.setHorizontalScrollBarEnabled(true);
    webView.getSettings().setLoadsImagesAutomatically(true);
    webView.getSettings().setAllowFileAccess(true);
    webView.getSettings().setJavaScriptEnabled(true);
    webView.setWebViewClient(new webviewclient());


    // ALLOW DOWNLOAD
    webView.setDownloadListener(new DownloadListener() {

        @Override
        public void onDownloadStart(String url, String userAgent,
                                    String contentDisposition, String mimetype,
                                    long contentLength) {
            DownloadManager.Request request = new DownloadManager.Request(
                    Uri.parse(url));

            request.allowScanningByMediaScanner();
            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); //Notify client once download is completed!
            final String filename= URLUtil.guessFileName(url, contentDisposition, mimetype);
            request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, filename);
            DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
            dm.enqueue(request);
            Toast.makeText(getApplicationContext(), "Downloading File", //To notify the Client that the file is being downloaded
                    Toast.LENGTH_LONG).show();

        }
    });

    // LOAD URL ( here where the download url start )
    String url = getIntent().getStringExtra("url");
    webView.loadUrl(url);

    if (savedInstanceState != null) {
        webView.restoreState(savedInstanceState);
    }   
}

@Override
public void onBackPressed()
{
    super.onBackPressed();
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    webView.saveState(outState);
}

public class webviewclient extends WebViewClient {

    @Override
    public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
        view.loadData("<html><head></head><body><center></br></br></br></br></br></br></br></br><h1>OOPS! Error Occurred</br> </br>Error occuring due to internet connection Issue or server on maintanance.</br></br>Please check your internet connection and relaunch application.</br></br>Or</br></br> Try after sometime. </h1></body></html>", "text/html", null);
        webview_java.this.finish();
    }


    @Override
    public boolean shouldOverrideUrlLoading(WebView client, String request) {
      client.loadUrl(request);
      return true;
    }

}

}

Manifest Permissions：

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.READ_PHONE_STATE" tools:node="remove"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" tools:node="remove"/>

下载文件 - 如何？

0 个答案: