Android progressBar not showing

I have a progressbar that is supposed to run in an AsyncTask , but it is not appearing, although the task runs

XML:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:background="@drawable/splashportrait">
<ProgressBar android:layout_alignParentBottom="true" android:indeterminate="true"
    android:layout_centerHorizontal="true" android:paddingBottom="450dip"
    android:layout_width="200dip" android:layout_height="200dip"
    android:id="@+id/progressBar1"></ProgressBar>
</RelativeLayout>

CODE:

ProgressBar diagProgress;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splashscreen);

    diagProgress = (ProgressBar)findViewById(R.id.progressBar1);
    DiagnosticsTask diag = new DiagnosticsTask();
    diag.execute();

  /**rest of class ommitted here**/
}

private class DiagnosticsTask extends AsyncTask<String, String, Boolean> {

    //Show spinner
    protected void onPreExecute() {
        //dialog.setMessage("Loading corresponding destinations...");
        //dialog.show();
        diagProgress.setVisibility(View.VISIBLE);
        diagProgress.showContextMenu();
        Log.e("AsyncStatus", 开发者_开发技巧"spinner shown");
    }
 /*other parts of the thread ommitted here*/

}

I had that issue when I forgot to turn on animations after testing xD

Try this replace your ProgressBar with the one below.

<ProgressBar
    android:id="@+id/progressBar1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:indeterminate="true"
    />

Let me know if it works, I would explain the rationale.

Rationale: Now I am putting your code below for ProgressBar

<ProgressBar
    android:id="@+id/progressBar1"
    android:layout_width="200dip"
    android:layout_height="200dip"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:indeterminate="true"
    android:paddingBottom="450dip"
    />

RelativeLayout allows you Z-ordering. So since you needed ProgressBar on top you need not do the kind of manipulations you are doing.

android:layout_alignParentBottom="true"  

This sets the Progress Bar at the botton of the layout:

android:paddingBottom="450dip" android:layout_width="200dip" android:layout_height="200dip"

All the three values here are absolute which is a strict no-no as far as Android is concerned. Most Likely your paddingBottom was pushing your ProgressBar out of View. As your padding is greater than the actual width/height of the control

As a thumb rule always use relative values for it to work on all the devices and form factors.

Let me know if this makes sense.

Did you forget to execute your task?

  ...
  diagProgress = (ProgressBar)findViewById(R.id.progressBar1);
  new DiagnosticsTask().execute();


  ....

I had that issue when I make visibility gone and visible instant of gone make invisible in my case working invisible and visible

private fun hideShowProgressBar(isShowProgress:Boolean){
    if(isShowProgress){
            progressBar.visibility = View.VISIBLE
            tvSetProgress.visibility = View.VISIBLE
    }else{
        progressBar.visibility = View.INVISIBLE
        tvSetProgress.visibility = View.INVISIBLE
    }
}