Question

I don’t need threads, I just want to increment the value of the progress bar manually by clicking a button.

Here’s the XML code

<ProgressBar
    android:id="@+id/progressBar1"
    style="?android:attr/progressBarStyleHorizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

And in the Java file I have

    ProgressBar pb;

    ...

    pb = (ProgressBar)findViewById(R.id.progressBar1);
    pb.setMax(100);
    pb.setProgress(0);

Now in a method that is called when a button is clicked, I want to increment the progress by one

public void increment(View view) {

    int progress = pb.getProgress();
    pb.setProgress(progress++);

}

This causes the program to crash. How can I control the ProgressBar from the Java program like this?

Answer 1

2 options:

final ProgressBar pb = (ProgressBar)findViewById(R.id.progressBar1);

or

private ProgressBar pb = null; placed as global variable.