技術標籤：Android

using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using System.IO;
using System.Text;
using Android.Util;

namespace File_QuickEdit
{
    [Activity(Label = "File_QuickEdit", MainLauncher = true , Icon = "@drawable/icon")]
    public class QuickEdit : Activity
    {
        const int MENU_GROUP = 0;
        const int SAVE_FILE_MENU_ID = 1;
        const int SAVE_FILE_MENU_ORDER = 1;
        const string QUICKEDIT_TAG = "QUICKEDIT";
        const string QUICKEDIT_FILENAME = "quickedit.txt";


        protected override void OnCreate( Bundle bundle)
        {
            base.OnCreate(bundle);

            // Set our view from the "main" layout resource
            SetContentView( Resource.Layout .Main);
            OpenFileInput();
        }
        /// <summary>
        /// 建立選項選單
        /// </summary>
        /// <param name=" menu"></param>
        /// <returns></returns>
        public override bool OnCreateOptionsMenu( IMenu menu)
        {
            base.OnCreateOptionsMenu(menu);
            menu.Add(MENU_GROUP,
                SAVE_FILE_MENU_ID,
                SAVE_FILE_MENU_ORDER,
                Resource.String .Save);
            return true ;
        }
        public override bool OnOptionsItemSelected( IMenuItem item)
        {
            base.OnOptionsItemSelected(item);
            switch(item.ItemId)
            {
                case SAVE_FILE_MENU_ID:
                    SaveFile();
                    return true ;
            }
            return false ;
        }

        private void SaveFile()
        {
            EditText editText = (EditText )FindViewById(Resource. Id.fileEditor);
            String content = editText.Text;
            try
            {
                Stream fos = OpenFileOutput(QUICKEDIT_FILENAME, FileCreationMode.Private);
                UTF8Encoding enc = new UTF8Encoding();
                fos.Write(enc.GetBytes(content), 0, enc.GetBytes(content).Length);
                fos.Close();
            }
            catch(Java.IO.FileNotFoundException e)
            {
                Log.Error(QUICKEDIT_TAG, e.Message);
            }
            catch (Java.IO.IOException e)
            {
                Log.Error(QUICKEDIT_TAG, e.Message);
            }
        }
        void SaveExternalFile()
        {
            EditText editText = (EditText )FindViewById(Resource. Id.fileEditor);
            String content = editText.Text.ToString();
            try
            {
                if(Android.OS.Environment .ExternalStorageState == Android.OS.Environment.MediaMounted)
                {
                    Java.IO. File dataDir = this .GetExternalFilesDir(Android.OS.Environment.DataDirectory.Path);
                    Stream fos = OpenFileOutput(dataDir+QUICKEDIT_FILENAME, FileCreationMode.Private);
                    UTF8Encoding enc = new UTF8Encoding();
                    fos.Write(enc.GetBytes(content), 0, enc.GetBytes(content).Length);
                    fos.Close();
                }
            }
            catch (Java.IO.FileNotFoundException e)
            {
                Log.Error(QUICKEDIT_TAG, e.Message);
            }
            catch (Java.IO.IOException e)
            {
                Log.Error(QUICKEDIT_TAG, e.Message);
            }
        }
        private void OpenFileInput()
        {
            byte[] content = new byte[1024];
            try
            {
                Stream fis = OpenFileInput(QUICKEDIT_FILENAME);
                if((fis.Read(content,0,content.Length))>0)
                {
                    EditText editText = (EditText )FindViewById(Resource. Id.fileEditor);
                    UTF8Encoding enc = new UTF8Encoding();
                    char[] chars = enc.GetChars(content);
                    int charLength = chars.Length;
                    if(charLength>0)
                    {
                        editText.SetText( new string (chars), Android.Widget.TextView. BufferType.Editable);
                    }
                }
         
            }
            catch (Java.IO.FileNotFoundException e)
            {
                Log.Error(QUICKEDIT_TAG, e.Message);
            }
            catch (Java.IO.IOException e)
            {
                Log.Error(QUICKEDIT_TAG, e.Message);
            }
        }
    }
}