Android Open Source - Speedometer Speedometer Preference Activity

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License

The source code is released under:
Apache License
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Java Source Code

/* Copyright 2012 Google Inc.
 *//from  w  ww .  ja  v a 2s  . c o m
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.wireless.speed.speedometer;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;
import android.util.Log;
import android.widget.Toast;

/**
 * Activity that handles user preferences
 * 
 * @author wenjiezeng@google.com (Steve Zeng)
 *
 */
public class SpeedometerPreferenceActivity extends PreferenceActivity {
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    addPreferencesFromResource(R.xml.preference);
    
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(
        getApplicationContext());
    Preference intervalPref = findPreference(getString(R.string.checkinIntervalPrefKey));
    Preference batteryPref = findPreference(getString(R.string.batteryMinThresPrefKey));
    
    /* This should never occur. */
    if (intervalPref == null || batteryPref == null) {
      Logger.w("Cannot find some of the preferences");
      Toast.makeText(SpeedometerPreferenceActivity.this, 
        getString(R.string.menuInitializationExceptionToast), Toast.LENGTH_LONG).show();
      return;
    }
    
    OnPreferenceChangeListener prefChangeListener = new OnPreferenceChangeListener() {
      @Override
      public boolean onPreferenceChange(Preference preference, Object newValue) {
        String prefKey = preference.getKey();
        if (prefKey.compareTo(getString(R.string.checkinIntervalPrefKey)) == 0) {
          try {
            Integer val = Integer.parseInt((String) newValue);
            if (val <= 0 || val > 24) {
              Toast.makeText(SpeedometerPreferenceActivity.this,
                  getString(R.string.invalidCheckinIntervalToast), Toast.LENGTH_LONG).show();
              return false;
            }
            return true;
          } catch (ClassCastException e) {
            Logger.e("Cannot cast checkin interval preference value to Integer");
            return false;
          } catch (NumberFormatException e) {
            Logger.e("Cannot cast checkin interval preference value to Integer");
            return false;
          }
        } else if (prefKey.compareTo(getString(R.string.batteryMinThresPrefKey)) == 0) {
          try {
            Integer val = Integer.parseInt((String) newValue);
            if (val < 0 || val > 100) {
              Toast.makeText(SpeedometerPreferenceActivity.this,
                  getString(R.string.invalidBatteryToast), Toast.LENGTH_LONG).show();
              return false;
            }
            return true;
          } catch (ClassCastException e) {
            Logger.e("Cannot cast battery preference value to Integer");
            return false;
          } catch (NumberFormatException e) {
            Logger.e("Cannot cast battery preference value to Integer");
            return false;
          }
        }
        return true;
      }
    };
    
    intervalPref.setOnPreferenceChangeListener(prefChangeListener);
    batteryPref.setOnPreferenceChangeListener(prefChangeListener);
  }
  
  /** 
   * As we leave the settings page, changes should be reflected in various applicable components
   * */
  @Override
  protected void onDestroy() {
    super.onDestroy();
    // The scheduler has a receiver monitoring this intent to get the update
    // TODO(Wenjie): Only broadcast update intent when there is real change in the settings
    this.sendBroadcast(new UpdateIntent("", UpdateIntent.PREFERENCE_ACTION));
  }
}
Java Source Code List
