Android Open Source - gps-lock-lock Seek Bar Preference

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.github.tdudziak.gps_lock_lock;
/*from   www. j av a  2s. c o m*/
import android.content.Context;
import android.content.res.TypedArray;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

/***
 * An integer {@link Preference} that can be changed by moving a {@link SeekBar}
 * inside {@link PreferenceActivity}. It supports following XML parameters
 * (all living in the namespace <code>http://github.com/tdudziak/gps-lock-lock/schema</code>):
 * <dl>
 *      <dt><code>min</code></dt><dd>minimal value (1 by default)</dd>
 *      <dt><code>max</code></dt><dd>maximal value (100 by default)</dd>
 * </dl>
 */
public class SeekBarPreference extends Preference implements OnSeekBarChangeListener
{
    private static final String XML_NAMESPACE = "http://github.com/tdudziak/gps-lock-lock/schema";

    private SeekBar mSeekBar;
    private TextView mValue;

    private int mMin;
    private int mMax;

    public SeekBarPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
        loadXml(attrs);
    }

    public SeekBarPreference(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        loadXml(attrs);
    }

    private void loadXml(AttributeSet attrs) {
        mMax = attrs.getAttributeIntValue(XML_NAMESPACE, "max", 100);
        mMin = attrs.getAttributeIntValue(XML_NAMESPACE, "min", 1);
    }

    @Override
    protected void onBindView(View view) {
        // Restore value. If necessary, clamp to desired range.
        int value = getPersistedInt(getDefaultDefault());
        if(value < mMin) value = mMin;
        if(value > mMax) value = mMax;

        mSeekBar.setOnSeekBarChangeListener(this);
        mSeekBar.setMax(mMax-mMin);
        mSeekBar.setProgress(value - mMin);
        mValue.setText(Integer.toString(value));

        super.onBindView(view);
    }

    @Override
    protected View onCreateView(ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        LinearLayout layout = (LinearLayout) inflater.inflate(R.layout.seek_bar_preference, parent, false);

        // Add default Preference view created by the superclass. It contains the title and summary which
        // may be styled in some special, hard to detect way. This way of doing this ensures consistency
        // between different preferences.
        View title = super.onCreateView(parent);
        layout.addView(title, 0);

        mSeekBar = (SeekBar) layout.findViewById(R.id.preferenceSeekBar);
        mValue = (TextView) layout.findViewById(R.id.preferenceTextValue);

        return layout;
    }

    @Override
    protected void onSetInitialValue(boolean restore, Object defaultValue) {
        if(!restore) {
            persistInt((Integer) defaultValue);
        }
    }

    @Override
    protected Object onGetDefaultValue(TypedArray a, int index) {
        return a.getInt(index, getDefaultDefault());
    }

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        int value = progress + mMin;
        mValue.setText(Integer.toString(value));
        persistInt(value);
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {}

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        notifyChanged();
    }

    private int getDefaultDefault() {
        return (mMin+mMax)/2;
    }
}

Java Source Code List

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