我的 AsyncTask 的 progressDialog 没有显示。它似乎是正确的，但它不显示对话框。内部操作完美运行，但似乎忽略了 onPreExecute() 和 onPostExecute() 方法。
private class copyApk extends AsyncTask<Void, Void, Void> {
int appPosition;
ProgressDialog mProgressDialog = new ProgressDialog(getActivity());
@Override
protected void onPreExecute(Void pre) {
super.onPreExecute();
mProgressDialog.setTitle("Copy apk");
mProgressDialog.setMessage("Copying...");
mProgressDialog.setIndeterminate(false);
mProgressDialog.show();
}
@Override
protected Void doInBackground(Void... apks) {
final File customfolder = new File(Environment.getExternalStorageDirectory().toString()+File.separator+"HazyApkBackup");
if(!customfolder.exists()){
customfolder.mkdirs();
}
try
{
vacca = getActivity().getPackageManager().getApplicationInfo(app.getPackageName(), packageManager.GET_META_DATA).sourceDir.toString();
//Toast.makeText(getActivity(), "Boh "+vacca, Toast.LENGTH_SHORT).show();
process = Runtime.getRuntime().exec("cp " + vacca + " " + customfolder);
//Toast.makeText(getActivity(), "Apk copied in "+customfolder, Toast.LENGTH_SHORT).show();
}
catch (PackageManager.NameNotFoundException | IOException e)
{
Toast.makeText(getActivity(), "Sorry, the apk was not copied correctly", Toast.LENGTH_SHORT).show();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if(mProgressDialog.isShowing())
Toast.makeText(getActivity(), "Apk copied in "+customfolder, Toast.LENGTH_SHORT).show();
mProgressDialog.dismiss();
}
}
谢谢
最佳答案
您的 onPreExecute() 方法没有被调用，因为它的签名不正确。正确的方法没有参数。
@Override
protected void onPreExecute()
{
...
关于java - AsyncTask 在运行期间不显示对话框，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25427906/