How to get viewId to use on another class?-CodePudding

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());

CodePudding user response：

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;
}

CodePudding user response：

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