Question

我搜索了有关如何从WebView下载文件的其他问题。

我希望能够使用网站下载文件，并允许用户从WebView打开Playstore。例如，某些网站会在其应用中添加链接或广告，打开对话框以使用Playstore或浏览器打开。我该怎么做呢？

以下是我的代码：

import android.os.Build;
import android.os.Bundle;
import android.view.KeyEvent;
import android.webkit.CookieManager;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.webkit.GeolocationPermissions;
import android.webkit.WebChromeClient;
import android.app.Activity;
import android.webkit.DownloadListener;
import android.app.DownloadManager.Request;
import android.app.DownloadManager;
import android.os.Environment;
import android.net.Uri;

public class MainActivity extends Activity {
    private WebView mWebView;

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

        // Allow third party cookies for Android Lollipop
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            mWebView = (WebView) findViewById(R.id.activity_main_webview);
            CookieManager cookieManager = CookieManager.getInstance();
            cookieManager.setAcceptThirdPartyCookies(mWebView,true);
        }

        mWebView = (WebView) findViewById(R.id.activity_main_webview);
        mWebView.setWebViewClient(new WebViewClient());
        mWebView.getSettings().setGeolocationEnabled(true);
        mWebView.setWebChromeClient(new WebChromeClient() {
            public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) {
                // callback.invoke(String origin, boolean allow, boolean remember);
                callback.invoke(origin, true, false);
            }
        });

        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.getSettings().setAppCacheEnabled(true);
        mWebView.getSettings().setDatabaseEnabled(true);
        mWebView.getSettings().setDomStorageEnabled(true);
        mWebView.getSettings().setAllowFileAccess(true);
        mWebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
        mWebView.getSettings().setSupportMultipleWindows(true);
        String appCachePath = getApplicationContext().getCacheDir().getAbsolutePath();
        mWebView.getSettings().setAllowFileAccess(true);
        mWebView.getSettings().setAppCachePath(appCachePath);

        mWebView.loadUrl("http://www.mywebsite.com/");
        mWebView.setDownloadListener(new DownloadListener() {
            public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
                //for downloading directly through download manager
                Request request = new Request(Uri.parse(url));
                request.allowScanningByMediaScanner();
                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "download.mp3");
                DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
                dm.enqueue(request);
            }
        });
    }
}

修改忘记提到它确实有效，但在文件下载后，它说＆＃34;无法打开文件＆＃34;

Answer 1

您有哪些与“无法打开文件”相关的日志？请提供更多与此相关的信息....

作为第一种方法，我建议添加缺失：

    request.setMimeType(mimeType);

如何从webview下载文件并从webview打开playstore

1 个答案: