创建网络视图应用程序后,每当我从其中下载文件时,它都会下载并保存在本地存储中,并在栏中显示通知,但是当我单击该文件以从通知栏中打开它时,它将强制关闭该应用程序并关闭也有PDF阅读器
我的主要activity.java文件代码
ackage net.jptechsolutions.jptechinvoice;
import android.app.DownloadManager;
import android.net.Uri;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.CookieManager;
import android.webkit.DownloadListener;
import android.webkit.URLUtil;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
public WebView mywebview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mywebview=(WebView)findViewById(R.id.webview);
WebSettings webSettings=mywebview.getSettings();
webSettings.setJavaScriptEnabled(true);
mywebview.loadUrl("https://*******"****""*n");
mywebview.setWebViewClient(new WebViewClient());
mywebview.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.setMimeType(mimeType);
String cookies = CookieManager.getInstance().getCookie(url);
request.addRequestHeader("cookie", cookies);
request.addRequestHeader("User-Agent", userAgent);
request.setDescription("Downloading file...");
request.setTitle(URLUtil.guessFileName(url, contentDisposition,
mimeType));
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setDestinationInExternalPublicDir(
Environment.DIRECTORY_DOWNLOADS, URLUtil.guessFileName(
url, contentDisposition, mimeType));
DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
dm.enqueue(request);
Toast.makeText(getApplicationContext(), "Downloading File",
Toast.LENGTH_LONG).show();
}});
}
@Override
public void onBackPressed() {
if (mywebview.canGoBack())
{
mywebview.goBack();
}
else
{
super.onBackPressed();
}
}
}
我该怎么办。