Android操做文件存儲信息 利用SharedReference存儲信息（獲取SDCARD大小）

一、機身內存

package com.pas.loginservice;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;

public class LoginService
{
	public static boolean saveUserInfo(Context context,String username,String password)
	{
		File file=new File(context.getFilesDir(),"info.txt");
		try
		{
			FileOutputStream fos=new FileOutputStream(file);
			fos.write((username+"##"+password).getBytes());
			fos.close();
			return true;
		} catch (FileNotFoundException e)
		{
			return false;
		} catch (IOException e)
		{
			return false;
		}
	}
	
	public static Map<String,String> getUserInfo(Context context)
	{
		File file=new File(context.getFilesDir(),"info.txt");
		FileInputStream fis;
		try
		{
			fis = new FileInputStream(file);
			BufferedReader br=new BufferedReader(new InputStreamReader(fis));
			String[] info=br.readLine().split("##");
			
			HashMap<String, String> map=new HashMap<String, String>();
			map.put("username", info[0]);
			map.put("password", info[1]);
			return map;
		} catch (Exception e)
		{
			return null;
		}
	}
}

二、外部SDCARD（包含利用SharedReference存儲信息）

package com.pas.loginservice;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Environment;
import android.os.StatFs;
import android.widget.Toast;
import android.text.format.Formatter;
public class LoginService
{
	/**
	 * 使用sharedPreferences存儲數據
	 * @param context
	 * @param username
	 * @param password
	 */
	public static void saveUserInfoToPF(Context context, String username, String password)
	{
		SharedPreferences SP=context.getSharedPreferences("config", Context.MODE_PRIVATE);
		Editor ed=SP.edit();
		ed.putString("username", username);
		ed.putString("password",password);
		ed.commit();
		Toast.makeText(context, "保存信息成功", Toast.LENGTH_SHORT).show();

	}
	
	public static Map<String, String> getUserInfoToPF(Context context)
	{
		SharedPreferences SP=context.getSharedPreferences("config", Context.MODE_PRIVATE);
		HashMap<String, String> map = new HashMap<String, String>();
		map.put("username", SP.getString("username",null));
		map.put("password", SP.getString("password",null));
		return map;
	}
	
	public static boolean saveUserInfo(Context context, String username, String password)
	{
		if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
		{
			File file = new File(context.getExternalFilesDir(null), "info.txt");
			try
			{
				FileOutputStream fos = new FileOutputStream(file);
				fos.write((username + "##" + password).getBytes());
				fos.close();
				return true;
			} catch (FileNotFoundException e)
			{
				return false;
			} catch (IOException e)
			{
				return false;
			}
		} else
		{
			Toast.makeText(context, "SD卡未掛載", Toast.LENGTH_SHORT).show();
			return false;
		}
	}

	public static Map<String, String> getUserInfo(Context context)
	{
		if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
		{
			File file = new File(context.getExternalFilesDir(null), "info.txt");
			FileInputStream fis;
			try
			{
				fis = new FileInputStream(file);
				BufferedReader br = new BufferedReader(new InputStreamReader(fis));
				String[] info = br.readLine().split("##");

				HashMap<String, String> map = new HashMap<String, String>();
				map.put("username", info[0]);
				map.put("password", info[1]);
				return map;
			} catch (Exception e)
			{
				return null;
			}
		} else
		{
			Toast.makeText(context, "SD卡未掛載", Toast.LENGTH_SHORT).show();
			return null;
		}

	}
	
	public static void getSDCardSize(Context context)
	{
		StatFs stat=new StatFs(Environment.getExternalStorageDirectory().getPath());
		long blocksize=stat.getBlockSize();
		long blockcount=stat.getBlockCount();
		long availableblockcount=stat.getAvailableBlocks();
		
		long sdsize=blockcount* blocksize;
		long avail_sdsize=availableblockcount*blocksize;
		
		String totalSize=Formatter.formatFileSize(context, sdsize);
		String availSize=Formatter.formatFileSize(context, avail_sdsize);
		
		Toast.makeText(context, "總共"+totalSize+"MB,可用"+availSize+"MB", 0).show();
	}
}