訪問EditText首選項對話框

Question

我很困惑我應該在哪裏使用sharedPreferences放置此代碼。我試圖找出如何創建對話框。我想訪問EditTextPreference對話框，一旦用戶輸入他們的名字，我想使用此代碼，將其保存到一個文件下面

SharedPreferences mySharedPreferences = getSharedPreferences("MyData", 

     Context.MODE_PRIVATE); 
     SharedPreferences.Editor editor = mySharedPreferences.edit(); 

     editor.putString("user_name",userName.getText().toString()); 

     editor.commit(); 

這是我的主要活動

public class MainActivity extends AppCompatActivity { 

    EditText userName; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
         .setAction("Action", null).show(); 
      } 
     }); 

     Button myButton = (Button) findViewById(R.id.show_button_id); 
     myButton.setOnClickListener(new View.OnClickListener(){ 
      @Override 
     public void onClick(View view){ 


      } 
     }); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
      Intent i = new Intent(MainActivity.this,UserPreferenceActivity.class); 
      startActivity(i); 
      //return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 
    } 

這裏是我的UserPreferenceFragment Java類

public class UserPreferenceFragment extends PreferenceFragment { 

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

     //LOAD THE PRFERENCE FROM AN XML RESOURCE FILE 
     addPreferencesFromResource(R.xml.preferences); 
    }//ends OnCreate 




    } 

這裏是我的UserPreferenceActivity java類

public class UserPreferenceActivity extends Activity { 

@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
/* 
setContentView(R.layout.content_main); 
FragmentManager fm = getFragmentManager(); 
FragmentTransaction ft = fm.beginTransaction(); 
ft. 
*/ 

getFragmentManager().beginTransaction() 
.replace(android.R.id.content,new UserPreferenceFragment()) 
.commit(); 

} 

這裏是我的喜好的xml文件

<?xml version="1.0" encoding="utf-8"?> 
<PreferenceScreen  xmlns:android="http://schemas.android.com/apk/res/android"> 
<CheckBoxPreference 
    android:key="show_background_pic" 
    android:title="@string/show_background_pic_title" 
    android:summary="@string/show_background_pic_summary" 
    android:defaultValue="true"> 

</CheckBoxPreference> 

<EditTextPreference 
    android:key="user_name" 
    android:title="@string/user_acct_name_title" 
    android:summary="@string/user_acct_name_summary" 
    android:defaultValue="NONAME"> 


</EditTextPreference> 

最後我的主要內容

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
app:layout_behavior="@string/appbar_scrolling_view_behavior" 

tools:showIn="@layout/activity_main"> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="@string/Shared_preferences_label" 
    android:id="@+id/textView" 
    android:layout_alignParentTop="true" 
    android:layout_alignParentStart="true" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@string/show_button_label" 
    android:id="@+id/show_button_id" 
    android:layout_below="@+id/textView" 
    android:layout_alignParentStart="true" /> 

</RelativeLayout> 

Answer 1

Using setOnPreferenceChangeListener method of Preference class and Preference.OnPreferenceChangeListener interface.something like this 

pref_general.xml file 

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"> 


    <EditTextPreference 
     android:capitalize="words" 
     android:defaultValue="@string/pref_default_display_name" 
     android:inputType="textCapWords" 
     android:key="@string/key_example_text" 
     android:maxLines="1" 
     android:selectAllOnFocus="true" 
     android:singleLine="true" 
     android:title="@string/pref_title_display_name" /> 
</PreferenceScreen> 

SettingPreferenceFragment.java 

package com.example.sunshine; 

import android.content.SharedPreferences; 
import android.os.Bundle; 
import android.preference.PreferenceManager; 
import android.util.Log; 
import android.view.View; 
import android.preference.PreferenceFragment; 
import android.preference.EditTextPreference; 
import android.preference.Preference; 
import android.preference.Preference.OnPreferenceChangeListener; 


public class SettingPreferenceFragment extends PreferenceFragment { 


    public final String TAG = "SettingActivity"; 


    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

     View view = super.onCreateView(inflater, container, savedInstanceState); 
     addPreferencesFromResource(R.xml.pref_general); 
     EditTextPreference location = (EditTextPreference) findPreference("example_text"); 
     location.setOnPreferenceChangeListener(new OnPreferenceChangeListener() { 
      @Override 
      public boolean onPreferenceChange(Preference preference, Object newValue) { 
       String locstr = newValue.toString(); 
       SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity().getApplicationContext()); 
       SharedPreferences.Editor editor = sharedPreferences.edit(); 
       editor.putString("example_text", locstr); 
       editor.commit(); 
       Log.e(TAG, "" + locstr); 
       return true; 
      } 
     }); 

     return view; 

    } 
}