file/Shareference 用法

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Android中常见的数据存储方式，存文件和存 SharedPrefrence , 他们都是存在在/data/data/com.xxxx.xxxx/ 下面。
常用写法如下：

package com.example.file;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

import android.content.Context;
import android.content.SharedPreferences;

public class FileAdapter {
private static final String NAME = “data”;
private Context mContext;

private SharedPreferences mSp;private SharedPreferences.Editor mSpEditor;public FileAdapter(Context context) {    mContext = context;    initSharedPreference();}public void saveStr(String inputTxt) {    FileOutputStream outstream = null;    BufferedWriter writer = null;    try {        outstream = mContext.openFileOutput(NAME, Context.MODE_PRIVATE);        writer = new BufferedWriter(new OutputStreamWriter(outstream));        writer.write(inputTxt);    } catch (IOException e) {        e.printStackTrace();    } finally {        try {            if (writer != null) {                writer.close();            }        } catch (IOException e2) {            e2.printStackTrace();        }    }}public String getStr() {    FileInputStream instream = null;    BufferedReader reader = null;    StringBuilder content = new StringBuilder();    try {        instream = mContext.openFileInput(NAME);        reader = new BufferedReader(new InputStreamReader(instream));        String line = "";        while ((line = reader.readLine()) != null) {            content.append(line);        }    } catch (IOException e) {        e.printStackTrace();    } finally {        try {            if (reader != null) {                reader.close();            }        } catch (IOException e2) {            e2.printStackTrace();        }    }    return content.toString();}private void initSharedPreference() {    mSp = mContext.getSharedPreferences("sp", Context.MODE_PRIVATE);    mSpEditor = mSp.edit();}// sp put intpublic void putSpString(String key, String value) {    if (mSp != null && mSpEditor != null) {        mSpEditor.putString(key, value);        mSpEditor.commit();    }}public String getSpString(String key) {    if (mSp != null) {       return mSp.getString(key, "");    }    return null;}

}

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