title: Firebase Android: How to cancel download?
body: <p>How can I cancel my downloading task from Firebase?</p>
  
  <p>I want to cancel the download whenever I click somewhere off the <code>ProgressDialog</code>.</p>
  
  <p>Here is the part where my Download Activity <code>ExamesActivity.java</code> is. It looks like:</p>
  
  <pre><code>//Download the File on Button(Download) click:
          bDownload.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
  
                  //Initalizing teh Spinner-to-String functions:
                  Grade = spClasse.getSelectedItem().toString();
                  Type = spEpoca.getSelectedItem().toString();
                  Subject = spDisciplina.getSelectedItem().toString();
                  Year = spAno.getSelectedItem().toString();
  
                  //Download the File:
                  //First Check if ON the Spinner, everything is choosen. It should be. If not, show error Toast.
                  if (Grade.equals("...") | Type.equals("...") | Disciplina.equals("...") | Year.equals("..."){
  
                      //Show the The Error Toast:
                      Toast.makeText(ExamesActivity.this, "everything shall be choosen", Toast.LENGTH_SHORT).show();
  
                  } else {                                          //What the dir would look like: "Subject/Grade/Year-Type.extension"
                      pdfRef = mStorageRef.child(Subject + "/" + Grade + "/" + Year + "-" + Type + ".pdf");
                      File root = android.os.Environment.getExternalStorageDirectory();
                      File dir = new File(root.getAbsolutePath() + "/Exams-App/");
  
                      //Show the ProgressDialog while downloading:
                      progressDialog.show();
  
                      if (!dir.exists()) {
                          dir.mkdirs();
                      }
  
                      localFile = new File(dir, Subject + "-" + Year + "-" + Grade + "-" + Type + ".pdf");
  
  
                      pdfRef.getFile(localFile).addOnSuccessListener(new OnSuccessListener&lt;FileDownloadTask.TaskSnapshot&gt;() {
                          @Override
                          public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {
                              // Local temp file has been created
                              progressDialog.dismiss();
                              Toast.makeText(ExamesActivity.this, "Exam was successfully downloaded!️",  Toast.LENGTH_SHORT).show();
                          }
                      }).addOnFailureListener(new OnFailureListener() {
                          @Override
                          public void onFailure(@NonNull Exception exception) {
                              // Handle any errors
                              progressDialog.dismiss();
                              Toast.makeText(ExamesActivity.this, "Exam not found on the server.", Toast.LENGTH_LONG).show();
                          }
  
                      }).addOnProgressListener(new OnProgressListener&lt;FileDownloadTask.TaskSnapshot&gt;() {
                          @Override
                          public void onProgress(FileDownloadTask.TaskSnapshot taskSnapshot) {
                              //Some math to get the Percentage of the Download :)
                              double progressPercentage = (100.0 * taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount();
                              double size = (taskSnapshot.getTotalByteCount()) / (1000000);
                              progressDialog.setMessage("PDF Size: " + (size) + " - " + ((int) progressPercentage) + "% - Click away to cancel the download.");
  
                          }
                      });
                  }
              }
          });
  </code></pre>