如何从 Firebase 取消我的下载任务？
每当我单击ProgressDialog.
这是我的下载活动所在的部分ExamesActivity.java。看起来像：
//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();
} …