Android SeekBar set progress value

问题

I want the SeekBar progress to change whenever I click a button. Using setProgress() works only for initial value. It throws an error if I use it after some changes.

回答1:

Perhaps you should try to use a handler? I use this in an app of mine and works fine.

1) When creating your SeekBar:

// ...
seekBarHandler = new Handler(); // must be created in the same thread that created the SeekBar
seekBar = (SeekBar) findViewById(R.id.my_seekbar);
// you should define max in xml, but if you need to do this by code, you must set max as 0 and then your desired value. this is because a bug in SeekBar (issue 12945) (don't really checked if it was corrected)
seekBar.setMax(0);
seekBar.setMax(max);
seekBar.setProgress(progress);
// ...

2) When your button is clicked

// ...
seekBarHandler.post(new Runnable() {
    @Override
    public void run() {
        if (seekBar != null) {
            seekBar.setMax(0);
            seekBar.setMax(max);
            seekBar.setProgress(newProgress);
        }
    }
});
// ...

回答2:

You can also use :

mSeekBar.refreshDrawableState();

after you set progress .

回答3:

Try this :

seekBar.setMax(50);
seekBar.setProgress(22);

instead of :

seekBar.setProgress(22); seekBar.setMax(50);

Only if you set the Max Value first, can the SeekBar get an idea of how much progress is actually made, when you set the progressValue.

This actually made a difference for me when I wanted a default value for my Progress Bar

回答4:

You need to call setOnSeekbarChangeListener() on your seekbar object and let for example your activity implement OnSeekbarChangeListener() and in that function you can do whatever you want.

回答5:

The solution that works for me:

mSeekbaBar.setProgress(progress);
mSeekbaBar.post(new Runnable() {
            @Override
            public void run() {
                mSeekbaBar.setProgress(progress);
            }
        });

It removes the blinking of the thumb

回答6:

As of support library 28.0.0 anyway, I can set the progress simply like this

mySeekBar.setProgress(17);

and the position gets updated without a problem.

来源：https://stackoverflow.com/questions/9792888/android-seekbar-set-progress-value

标签

android

seekbar