Question 127777 in Android Studio Question posted in
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Android Studio – How to get viewId to use on another class?

I want to make a class to process ProgressBar.
But i cant find a way to transfer the viewId, which make null pointer error.

This the helperclass:

public class HelperProgressBar {
ProgressBar progressBar;
Activity activity;
int ID;

public HelperProgressBar(Activity activity, int ID) {
    this.activity = activity;
    this.ID = ID;
    progressBar.findViewById(ID);
}

public void showProgressBar(){
    progressBar.setVisibility(View.VISIBLE);
    activity.getWindow().setFlags(
            WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
            WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);
}

public void hideProgressBar(){
    activity.getWindow().clearFlags(
            WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);
}}

And this how i call it:

HelperProgressBar helperProgressBar = new HelperProgressBar(getApplicationContext(), progressBar.getId());
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2

Answers


  1. 0

    because progressBar is in your parent layout, not in progressBar.

    Just pass the view so that you can handle it.

    public HelperProgressBar(Activity activity, ProgressBar progressBar) {
    this.activity = activity;
    this.progressBar = progressBar;
}
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  2. 0

    The constructor does not assign progressBar, only calls progressBar.findViewById(ID)

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