SeekBarPreference.java :  » News » ttnews4android » name » flurl » android » tt_news4android » Android Open Source

package name.flurl.android.tt_news4android;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.TypedArray;
import android.graphics.Typeface;
import android.preference.Preference;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class SeekBarPreference extends Preference implements
    OnSeekBarChangeListener {

  public int maximum = 20;
  public int interval = 1;

  private float oldValue = 4;
  private TextView monitorBox;

  public SeekBarPreference(Context context) {
    super(context);
  }

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

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

  @Override
  protected View onCreateView(ViewGroup parent) {

    LinearLayout layout = new LinearLayout(getContext());

    LinearLayout.LayoutParams params1 = new LinearLayout.LayoutParams(
        LinearLayout.LayoutParams.WRAP_CONTENT,
        LinearLayout.LayoutParams.WRAP_CONTENT);
    params1.gravity = Gravity.LEFT;
    params1.weight = 1.0f;

    LinearLayout.LayoutParams params2 = new LinearLayout.LayoutParams(80,
        LinearLayout.LayoutParams.WRAP_CONTENT);
    params2.gravity = Gravity.RIGHT;

    LinearLayout.LayoutParams params3 = new LinearLayout.LayoutParams(30,
        LinearLayout.LayoutParams.WRAP_CONTENT);
    params3.gravity = Gravity.CENTER;

    layout.setPadding(15, 5, 10, 5);
    layout.setOrientation(LinearLayout.HORIZONTAL);

    TextView view = new TextView(getContext());
    view.setText(getTitle());
    view.setTextSize(18);
    view.setTypeface(Typeface.SANS_SERIF, Typeface.BOLD);
    view.setGravity(Gravity.LEFT);
    view.setLayoutParams(params1);

    SeekBar bar = new SeekBar(getContext());
    bar.setMax(maximum);
    bar.setProgress((int) this.oldValue);
    bar.setLayoutParams(params2);
    bar.setOnSeekBarChangeListener(this);

    this.monitorBox = new TextView(getContext());
    this.monitorBox.setTextSize(12);
    this.monitorBox.setTypeface(Typeface.MONOSPACE, Typeface.ITALIC);
    this.monitorBox.setLayoutParams(params3);
    this.monitorBox.setPadding(2, 5, 0, 0);
    this.monitorBox.setText(bar.getProgress() + "");

    layout.addView(view);
    layout.addView(bar);
    layout.addView(this.monitorBox);
    layout.setId(android.R.id.widget_frame);

    return layout;
  }

  @Override
  public void onProgressChanged(SeekBar seekBar, int progress,
      boolean fromUser) {

    progress = Math.round(((float) progress) / interval) * interval;

    if (!callChangeListener(progress)) {
      seekBar.setProgress((int) this.oldValue);
      return;
    }

    seekBar.setProgress(progress);
    this.oldValue = progress;
    this.monitorBox.setText(progress + "");
    updatePreference(progress);

    notifyChanged();
  }

  @Override
  public void onStartTrackingTouch(SeekBar seekBar) {
  }

  @Override
  public void onStopTrackingTouch(SeekBar seekBar) {
  }

  @Override
  protected Object onGetDefaultValue(TypedArray ta, int index) {

    int dValue = (int) ta.getInt(index, 50);

    return validateValue(dValue);
  }

  @Override
  protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {

    int temp = restoreValue ? getPersistedInt(50) : (Integer) defaultValue;

    if (!restoreValue)
      persistInt(temp);

    this.oldValue = temp;
  }

  private int validateValue(int value) {

    if (value > maximum)
      value = maximum;
    else if (value < 0)
      value = 0;
    else if (value % interval != 0)
      value = Math.round(((float) value) / interval) * interval;

    return value;
  }

  private void updatePreference(int newValue) {

    SharedPreferences.Editor editor = getEditor();
    editor.putInt(getKey(), newValue);
    editor.commit();
  }

}