Android 如何在不同的布局中更新TextView

如何从MyPreferenceFragment.java更新TextView genderTextView？
提前谢谢你

• gender.xml：

  I'm just trying to update TextView (@id/pref_gender_textView) in the "gender.xml" where gender.xml is defined in preference.xml.  I'd like to update the TextView from MyPreferenceFragment.java
  

  ---

  Android框架负责将首选项保存在设备上应用程序的/data目录中的XML文件中。API提供了几种方法来处理存储的首选项
  您确实不想在其他布局中更新TextView。这样做会在首选项视图和其他视图之间引入不必要的紧密耦合。您真正想要的只是在设置更改时更新TextView中的文本。这可以通过实现SharedReferences.OnSharedPreferenceChangeListener来实现。为此，请将您的活动注册为侦听器，例如：

  import android.os.Bundle;
  import android.preference.ListPreference;
  import android.preference.Preference;
  import android.preference.Preference.OnPreferenceChangeListener;
  import android.preference.PreferenceFragment;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.TextView;
  
  public class MyPreferenceFragment extends PreferenceFragment{   
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
          addPreferencesFromResource(R.xml.preferences);
  
          /** Defining PreferenceChangeListener */
          OnPreferenceChangeListener onPreferenceChangeListener = new OnPreferenceChangeListener() {
  
              @Override
              public boolean onPreferenceChange(Preference preference, Object newValue) {             
                  OnPreferenceChangeListener listener = ( OnPreferenceChangeListener) getActivity();
                  listener.onPreferenceChange(preference, newValue);
                  return true;
              }
          };  
  
      }
  
  }
  

  ---

  性别文本视图在哪里？其他活动的一部分还是什么？

  <?xml version="1.0" encoding="utf-8"?>
  <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
  
      <ListPreference
              android:key="lp_gender"
              android:entries="@array/array_lp_gender"
              android:entryValues="@array/array_lp_gender_values"
              android:title="@string/str_lp_android_choice_gender"
              android:layout="@layout/gender"/>
  
  </PreferenceScreen>
  

  import android.os.Bundle;
  import android.preference.ListPreference;
  import android.preference.Preference;
  import android.preference.Preference.OnPreferenceChangeListener;
  import android.preference.PreferenceFragment;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.TextView;
  
  public class MyPreferenceFragment extends PreferenceFragment{   
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
          addPreferencesFromResource(R.xml.preferences);
  
          /** Defining PreferenceChangeListener */
          OnPreferenceChangeListener onPreferenceChangeListener = new OnPreferenceChangeListener() {
  
              @Override
              public boolean onPreferenceChange(Preference preference, Object newValue) {             
                  OnPreferenceChangeListener listener = ( OnPreferenceChangeListener) getActivity();
                  listener.onPreferenceChange(preference, newValue);
                  return true;
              }
          };  
  
      }
  
  }
  

  public class YourActivity extends Activity implements OnSharedPreferenceChangeListener {
  
     private TextView mMyText;
  
     @Override
      public void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
          setContentView(R.layout.your_layout);
  
          mMyText = (TextView) findViewById(android.R.id.my_text);
  
          // listen to preference changes
          SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
          sharedPref.registerOnSharedPreferenceChangeListener(this);
  
          ...
      }
  
      @Override
      public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
              String key) {
  
          if(key.equals(getString(R.string.pref_key_myText))){
  
              mMyText.setText(sharedPreferences.getString(key, getString(R.string.pref_myText_defaultValue)));
          }
      }
  }