Android Studio WebView -下载扩展名为admin-ajax.php的文件 &g

Question

我一直在学习Android Studio(我不是专家)。然而，我设法从一个网站编码我的WebView应用程序，我不能让它下载文件作为他们的原始文件名…由于某些原因，我得到一个"admin-ajax。php">

这是MainActivity.java上的代码:

mywebView.setDownloadListener(new DownloadListener() {
@Override
public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long l) {
//file name
String fileName = URLUtil.guessFileName(url,contentDisposition,getFileType(url));
sFileName = fileName.substring(fileName.lastIndexOf('/')+1);
sURL = url;
sUserAgent = userAgent;
//check android version
if (Build.VERSION.SDK_INT>= Build.VERSION_CODES.M){
if (ContextCompat.checkSelfPermission( MainActivity.this,Manifest.permission.WRITE_EXTERNAL_STORAGE)
==PackageManager.PERMISSION_GRANTED){
downloadFile(fileName,url,userAgent);
}else {
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}
,  1001);
}
}else{
downloadFile(fileName,url,userAgent);
}

}
public void onPageStarted(WebView view,String url, Bitmap favicon){
onPageStarted (view,url, favicon);
}
});
}
@Override
public void onBackPressed() {
if (webView.canGoBack())
webView.goBack();
else
super.onBackPressed();
}
public String getFileType(String url){
ContentResolver contentResolver = getContentResolver();
MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
return mimeTypeMap.getExtensionFromMimeType(contentResolver.getType(Uri.parse(url)));
}
private void downloadFile(String fileName, String url, String userAgent){
try {
DownloadManager downloadManager = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);
DownloadManager.Request request = new DownloadManager.Request (Uri.parse(url));
String cookie  = CookieManager.getInstance().getCookie(url);
request.setTitle(fileName)
.setDescription("is being downloaded")
.addRequestHeader("cookie",cookie)
.addRequestHeader("User - Agent", userAgent)
.setMimeType(getFileType(url))
.setAllowedOverMetered(true)
.setAllowedOverRoaming(true)
.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE
|DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
downloadManager.enqueue(request);
sURL = "";
sUserAgent = "";
sFileName = "";
Toast.makeText( this, "Download Started", Toast.LENGTH_SHORT).show();
}catch (Exception ignored){
Toast.makeText( this, "error"+ignored, Toast.LENGTH_SHORT).show();
}
}

public void onRequestPermissionResult(int requestCode, @NonNull String [] permissions, int[] grantResults){
super.onRequestPermissionsResult(requestCode,permissions,grantResults);
if (requestCode==1001){
if (grantResults.length>0&&grantResults[0]==PackageManager.PERMISSION_GRANTED){
if (!sURL.equals("")&&!sFileName.equals("")&&!sUserAgent.equals("")){
downloadFile(sFileName,sURL,sUserAgent);
}
}
}
}

有什么问题吗?

感谢大家的支持

亲切的问候,

Answer 1

使用下面的代码。

将i.setDataAndType(uri, "application/pdf");替换为另一种类型的文件扩展名

1. 文件扩展名不是pdf;和

2. 你想在下载后打开文件。

   public class WebViewActivity extends AppCompatActivity {
   ...
   private String fileName;
   @Override
   protected void onCreate(@Nullable Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   ...
   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));
   //setup the fileName
   //fileName = URLUtil.guessFileName(url,contentDisposition,mimeType);
   fileName = (contentDisposition.substring(contentDisposition.lastIndexOf("filename*=UTF-8")+17));
   request.setMimeType(mimeType);
   String cookies = CookieManager.getInstance().getCookie(url);
   request.addRequestHeader("cookie",cookies);
   request.addRequestHeader("User-Agent",userAgent);
   request.setDescription("Downloading File");
   request.setTitle(fileName));
   request.allowScanningByMediaScanner();
   request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
   request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,
   fileName);
   DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
   //Registering receiver in Download Manager
   registerReceiver(onCompleted, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));    
   downloadManager.enqueue(request);
   Toast.makeText(getApplicationContext(), "Downloading File", Toast.LENGTH_SHORT).show();
   }
   });
   ...
   BroadcastReceiver onCompleted = new BroadcastReceiver() {
   @Override
   public void onReceive(Context context, Intent intent) {
   Toast.makeText(context.getApplicationContext(), "Download Finish", Toast.LENGTH_SHORT).show();
   File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "/" + fileName);
   Uri uri = FileProvider.getUriForFile(WebViewActivity.this, "com.example.app"+".provider",file);
   Intent i = new Intent(Intent.ACTION_VIEW);
   i.setDataAndType(uri, "application/pdf");
   i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_GRANT_READ_URI_PERMISSION);
   startActivity(i);
   }
   };
   }