PreferenceActivity使用示例代码,Java代码库,德仔网

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【Java】 PreferenceActivity使用示例
作者:dezai / 发布于2014/2/24/ 302
MainActivity如下:

package cn.testpreferenceactivity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.CheckBoxPreference;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.Preference.OnPreferenceClickListener;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;
/**
* Demo描述:
* PreferenceActivity的使用示例
*
* 注意事项:
* 1 不要ListPreference的属性android:dialogMessage
*  若设置则无法弹出选择列表.
*  这和单选,多选对话框类似不能设置其Message.
* 2 不要ListPreference的属性android:positiveButtonText
*  即使设置也无效
* 3 注意ListPreference的默认值的设定
*  android:defaultValue="222"
*  该值必须是 android:entryValues="@array/values_array"
*  这个数组中包含的值!!!!!!!!!!!!!
* 
* 
* 参考资料:
* 1 http://www.cnblogs.com/adm1989/archive/2012/08/01/2618403.html
* 2 http://www.eoeandroid.com/forum.php?mod=viewthread&tid=188859
*  Thank you very much
*/
public class MainActivity extends PreferenceActivity {
 private CheckBoxPreference mCheckBoxPreference;
 private ListPreference mListPreference;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    addPreferencesFromResource(R.xml.preferenceactivity);
    init();
  }
  private void init(){
    mCheckBoxPreference=
    (CheckBoxPreference) findPreference(getResources().getString(R.string.first_key));
    mCheckBoxPreference.setOnPreferenceChangeListener(new PreferenceChangeListenerImpl());
    mCheckBoxPreference.setOnPreferenceClickListener(new PreferenceClickListenerImpl());

    mListPreference=
    (ListPreference) findPreference(getResources().getString(R.string.listpreference_key));
    mListPreference.setOnPreferenceChangeListener(new PreferenceChangeListenerImpl());
    mListPreference.setOnPreferenceClickListener(new PreferenceClickListenerImpl());
  }

  private class PreferenceClickListenerImpl implements OnPreferenceClickListener{
    @Override
    public boolean onPreferenceClick(Preference preference) {
      String preferenceKey=preference.getKey().toString();
      if (preferenceKey.equals(getResources().getString(R.string.first_key))) {
        System.out.println("点击了CheckBoxPreference");
      }
      if (preferenceKey.equals(getResources().getString(R.string.listpreference_key))) {
        System.out.println("点击了ListPreference");
      }
      return true;
    }
  }

  /**
  * 注意事项:
  * 在OnPreferenceChangeListener的onPreferenceChange()
  * 可知改变后的值,但该值还未真正存入尚在内存中贮存.
  * 所以此时调用getValuesFromSP得到的只是改变前的值.
  *
  */
  private class PreferenceChangeListenerImpl implements OnPreferenceChangeListener{
    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
      String preferenceKey=preference.getKey().toString();
      if (preferenceKey.equals(getResources().getString(R.string.first_key))) {
        System.out.println("切换后值为:"+newValue.toString());
      }
      if (preferenceKey.equals(getResources().getString(R.string.listpreference_key))) {
        System.out.println("切换后值为:"+newValue.toString());
      }
      return true;
    }

  }

  @Override
  public void onBackPressed() {
    getValuesFromSP();
    super.onBackPressed();
  }

  // 从PreferenceActivity的SharedPreferences中取数据
  private void getValuesFromSP(){
    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
    Boolean first_value = sp.getBoolean(getResources().getString(R.string.first_key), false);
    String listpreference_key = sp.getString(getResources().getString(R.string.listpreference_key), null);
    System.out.println("从SharedPreferences中取出的是:" + first_value);
    System.out.println("从SharedPreferences中取出的是:" + listpreference_key);
  }
}
                preferenceactivity.xml如下:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >

  <CheckBoxPreference
    android:key="@string/first_key"
    android:summary="@string/first_default"
    android:summaryOff="@string/first_off"
    android:summaryOn="@string/first_on"
    android:title="@string/first_title"
  />

  <ListPreference
    android:dialogIcon="@drawable/ic_launcher"
    android:dialogTitle="@string/listpreference_title"
    android:entries="@array/names_array"
    android:entryValues="@array/values_array"
    android:key="@string/listpreference_key"
    android:negativeButtonText="@string/listpreference_no"
    android:summary="@string/listpreference_summary"
    android:title="@string/listpreference_title"
    android:defaultValue="222"
  />

</PreferenceScreen>
                strings.xml如下:
<?xml version="1.0" encoding="utf-8"?>
<resources>

  <string name="app_name">TestPreferenceActivity</string>
  <string name="action_settings">Settings</string>
  <string name="hello_world">Hello world!</string>

  <string name="first_key">first_key</string>
  <string name="first_on">first_on</string>
  <string name="first_off">first_off</string>
  <string name="first_title">first_title</string>
  <string name="first_default">first_default</string>

  <string name="listpreference_key">listpreference_key</string>
  <string name="listpreference_title">listpreference_title</string>
  <string name="listpreference_summary">listpreference_summary</string>
  <string name="listpreference_message">listpreference_message</string>
  <string name="listpreference_ok">OK</string>
  <string name="listpreference_no">NO</string>

</resources>
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