如何更新不同布局的TextView

Question

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 

如何从MyPreferenceFragment.java更新TextView genderTextView？
非常感谢您提前！

• gender.xml：

  <LinearLayout style="@style/PrefHorizontalLayout2" 
         android:theme="@style/AppTheme"> 
  
      <TextView style="@style/PrefTextTitle2" 
         android:text="@string/pref_gender"/> 
  
      <TextView android:layout_height="wrap_content" 
         android:layout_width="fill_parent" 
         android:id="@+id/pref_gender_textView" 
  </LinearLayout> 
  

- preference.xml样子：

<?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> 

现在，我想访问“genderTextView”从某处“MyPreferenceFragment.java”

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; 
      } 
     }; 

    } 

} 

Answer 1

Android框架需要对应用程序/数据目录中的XML文件坚持喜好的护理设备。该API提供了几种方法来处理存储的首选项。

你并不是真的想更新不同布局的TextView。这样做会引入您偏好视图和其他视图之间不必要的紧密耦合。你真正想要的只是在设置发生变化时更新TextView中的文本。这可以通过实现SharedPreferences.OnSharedPreferenceChangeListener来实现。要这样做注册例如您的活动作为侦听器：

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))); 
     } 
    } 
}