I have created a Custom SeekBarPreference
such that it displays a range of time to be selected from (say 0.2
sec to 2.2
sec). My problem is onProgressChanged() is called twice - once with progress = 0
and the second time with progress = "actual value"
. I am storing the value in a SharedPreference
so that I can use it later in my application.
Here is my code snippet -
@Override
protected View onCreateDialogView() {
LayoutInflater inflator = ((PreferenceActivity) mContext)
.getLayoutInflater();
View view = inflator.inflate(R.layout.seek_bar, null);
mCurrentValue = PreferenceManager.getDefaultSharedPreferences(mContext)
.getFloat(this.getKey(), mDefaultValue);
......
SeekBar mSeekBar = (SeekBar) view.findViewById(R.id.seekbar);
mSeekBar.setOnSeekBarChangeListener(this);
mSeekBar.setMax(20);
mSeekBar.setProgress((int) ((mCurrentValue - mMinValue)
/ (mMaxValue - mMinValue) * 20)); // 20 = progress bar max value.
return view;
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
if (progress != 0) {
mCurrentValue = (float) ((float) progress / 20
* (mMaxValue - mMinValue) + mMinValue);
}
mValueText.setText(Float.toString(mCurrentValue));
/* mValueText is a TextBox where I display my Current Value */
}
Here, I have checked the value of progress such that it is not equal to 0
and hence it avoids the first call. However, the side-effect of this is that I am not able to set anything to 0
.
What can be the work around for this?
The callback method onProgressChanged()
has a boolean
parameter fromUser
.
Using this parameter we can determine if the changes are coming from the Framework or are made by the User himself.
Thus, an implementation like -
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
if (fromUser) { // If the changes are from the User only then accept the
// changes
/* Instead of -> if (progress != 0) { */
mCurrentValue = (float) ((float) progress / 20
* (mMaxValue - mMinValue) + mMinValue);
mCurrentValue *= 10;
mCurrentValue = Math.round(mCurrentValue);
mCurrentValue /= 10;
}
mValueText.setText(Float.toString(mCurrentValue));
}
sets the value of TextView
only when it is changed by the User.
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