Question

I’m using the following code to download a pdf from a list of pdfs depending on which is selected. I want to then open the pdf downloaded. The problem is that the code to open the pdf occurs before the download is finished. How do I make it so that the code to open the pdf doesn’t run until the download is finished…..

Note: the reason i’m reading in the pdf originally as a text/html is because I originally have the pdf as a website url and then it automatically downloads when opened in a url.

  public class pdfSelectedListener implements OnItemClickListener{

    @Override
    public void onItemClick(AdapterView<?> parent,
            View view, int pos, long id) {
        String pdfName = "";

        for(int i=0;i<nameList.size();i++){
            if(nameList.get(i).equals(parent.getItemAtPosition(pos).toString())){
                try{
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setDataAndType(Uri.parse(websiteList.get(i)), "text/html");


                int slashIndex = websiteList.get(i).lastIndexOf('/');
                pdfName = websiteList.get(i).substring(slashIndex+1, websiteList.get(i).length());

                startActivity(intent);
                }catch(Exception e){
                    Toast.makeText(PDFActivity.this, "Invalid link.", Toast.LENGTH_LONG).show();
                }
            }
        }

//I dont want the the following code to excute until the above code is done downloading the pdf from the internet.

                    File file = new File("/mnt/sdcard/Download/"+pdfName);
                        if (file.exists()) {
                            Uri path = Uri.fromFile(file);
                            Intent intent = new Intent(Intent.ACTION_VIEW);
                            intent.setDataAndType(path, "application/pdf");
                            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

                            try {
                                startActivity(intent);
                            } 
                            catch (ActivityNotFoundException e) {
                                Toast.makeText(PDFActivity.this, 
                                    "No Application Available to View PDF", 
                                    Toast.LENGTH_SHORT).show();
                            }
                        }else{
                            Toast.makeText(PDFActivity.this, 
                                    "File doesn't exist.", 
                                    Toast.LENGTH_SHORT).show();
                        }
        }
    }   

Answer 1

You should implement AsyncTask for downloading PDF files.

• Inside doInBackground(), download PDF files
• Inside onPostExecute(), do whatever you want to do for downloaded PDFs.