Android Open Source - android-memorytrainer Edit Preferences Activity

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License

The source code is released under:

GNU General Public License

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Java Source Code

package org.hoffimar.android.memorytrainer;
//w  ww . j  a va  2  s  .c  om
import java.util.ArrayList;
import java.util.List;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.PreferenceActivity;

public class EditPreferencesActivity extends PreferenceActivity implements
    SharedPreferences.OnSharedPreferenceChangeListener {

  private ListPreference lowerBoundaryPreference;
  private ListPreference upperBoundaryPreference;
  private SharedPreferences sharedPreferences;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    addPreferencesFromResource(R.xml.preferences);

    sharedPreferences = getSharedPreferences(Overview.PREFS_NAME, 0);
    String lowerString = sharedPreferences.getString("lowerBoundary", "1");
    String upperString = sharedPreferences.getString("upperBoundary", "100");

    lowerBoundaryPreference = (ListPreference) findPreference("lowerBoundary");
    fillPreferenceWithEntries(true, 1, Integer.parseInt(upperString) - 1);

    upperBoundaryPreference = (ListPreference) findPreference("upperBoundary");
    fillPreferenceWithEntries(false, Integer.parseInt(lowerString) + 1, 100);


  }

  private void fillPreferenceWithEntries(boolean lower, int low, int up) {
    List<String> entriesList = new ArrayList<String>();
    List<String> entryValuesList = new ArrayList<String>();

    for (int i = low; i <= up; i++) {
      entriesList.add((new Integer(i)).toString());
      entryValuesList.add((new Integer(i)).toString());
    }

    CharSequence[] entries = new CharSequence[entriesList.size()];
    CharSequence[] entryValues = new CharSequence[entryValuesList.size()];

    if (lower) {
      lowerBoundaryPreference.setEntries(entriesList.toArray(entries));
      lowerBoundaryPreference.setEntryValues(entryValuesList.toArray(entryValues));
    } else {
      upperBoundaryPreference.setEntries(entriesList.toArray(entries));
      upperBoundaryPreference.setEntryValues(entryValuesList.toArray(entryValues));
    }

  }

  @Override
  protected void onResume() {
    super.onResume();
    // Set up a listener whenever a key changes
    getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
  }

  @Override
  protected void onPause() {
    super.onPause();
    // Unregister the listener whenever a key changes
    getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(
        this);
  }

  @Override
  public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
    SharedPreferences.Editor editor = this.sharedPreferences.edit();
    
    if (key.equalsIgnoreCase("lowerBoundary")) {
      String lowerString = sharedPreferences.getString("lowerBoundary", "1");
      fillPreferenceWithEntries(false, Integer.parseInt(lowerString) + 1, 100);
      editor.putString("lowerBoundary", lowerString);
    }
    if (key.equalsIgnoreCase("upperBoundary")) {
      String upperString = sharedPreferences.getString("upperBoundary", "100");
      fillPreferenceWithEntries(true, 1, Integer.parseInt(upperString) - 1);
      editor.putString("upperBoundary", upperString);
    }
    editor.commit();

  }

}

Java Source Code List