Android的共享選項編輯器(SharedPreferences.Editor)

共享選項編輯器(SharedPreferences.Editor)是一個用於修改SharedPreferences對象值的接口. 編輯選項值後, 調用commit()或apply()方法以更新SharedPreferences.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<CheckBox 
    android:id="@+id/pref_checkbox"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"    
 />
<EditText
    android:id="@+id/pref_edittext"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"    
 />
<Button
    android:id="@+id/saveedittext"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"    
    android:text="Save EditText"
 />
</LinearLayout>

package com.AndroidSharedPreferencesEditor;

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;

public class AndroidSharedPreferencesEditor extends Activity {
 
 CheckBox checkBox;
 EditText editText;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        checkBox = (CheckBox)findViewById(R.id.pref_checkbox);
        editText = (EditText)findViewById(R.id.pref_edittext);
        Button buttonSaveEditText = (Button)findViewById(R.id.saveedittext);
        LoadPreferences();
        
        checkBox.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener(){

   @Override
   public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
    // TODO Auto-generated method stub
    SavePref();
   }});
        
        buttonSaveEditText.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    SavePref();
   }});
        
    }
    
    private void LoadPreferences(){
        SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
        
        boolean savedBoolean = sharedPreferences.getBoolean("PREF_BOOLEAN", false);
        String savedString = sharedPreferences.getString("PREF_STRING", "");

        checkBox.setChecked(savedBoolean);
        editText.setText(savedString);
    }
    
    private void SavePref(){
     boolean booleanCheckBox = checkBox.isChecked();
     String stringEditText = editText.getText().toString();
     
     SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putBoolean("PREF_BOOLEAN", booleanCheckBox);
        editor.putString("PREF_STRING", stringEditText);
        editor.commit();
    }
}

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- getPreferences() vs getSharedPreferences()