Android文件读写，保存数据

package com.king.android.db;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.os.Environment;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import com.king.android.R;

/**

 * 描述：文件存储

 * 作者：Andy.Liu

 * 时间： 2012-7-9  上午08:06:23

 **/

public class FileStoreActivity extends Activity  implements OnClickListener{

/**保存字符串的key*/

public static final String STRING_KEY ="string_key";

/**保存字符串的的名字*/

public static final String STRING_NAME ="string_name";

public static final String FILE_NAME = "hello.txt";//保存的文件名

Context mContext = null;

EditText edSave,edRead;

Button btnSave,btnRead;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

mContext = FileStoreActivity.this;

initView();

}

private void initView(){

setContentView(R.layout.store_layout);

edSave = (EditText) findViewById(R.id.ed_edit);

edRead = (EditText) findViewById(R.id.ed_show);

btnSave = (Button) findViewById(R.id.btn_save);

btnSave.setOnClickListener(this);

btnRead = (Button) findViewById(R.id.btn_read);

btnRead.setOnClickListener(this);

}

@Override

public void onClick(View v) {

switch(v.getId()){

case R.id.btn_save:

FileStoreTools.saveFile(edSave.getText().toString(), FileStoreTools.getSDPath()+File.separator+FILE_NAME);

break;

case R.id.btn_read:

edRead.setText(FileStoreTools.readFile(FileStoreTools.getSDPath()+File.separator+FILE_NAME));

break;

}

}

final static  class FileStoreTools{

/**

* 

*TODO：保存文件 根目录

*Author：Andy.Liu

*Create Time：2012-7-10 上午08:54:14

*TAG：@return

*Return：String

*/

public static String getSDPath(){

boolean hasSDCard = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);

if(hasSDCard){

return Environment.getExternalStorageDirectory().toString();

}else

return Environment.getDownloadCacheDirectory().toString();

}

/**

* 

*TODO：保存文件

*Author：Andy.Liu

*Create Time：2012-7-10 上午08:42:40

*TAG：@param str文件的内容

*TAG：@param filePath保存路径

*Return：void

*/

public static void saveFile(String str,String filePath){

FileOutputStream fos = null;

try {

File file = new File(filePath);

if(!file.exists())

file.mkdirs();

fos = new FileOutputStream(file);

fos.write(str.getBytes());

fos.flush();

} catch (FileNotFoundException e) {

e.printStackTrace();

}catch(IOException e){

e.printStackTrace();

}finally{

try {

if(null!=fos)

fos.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

/**

* 

*TODO：读取文件

*Author：Andy.Liu

*Create Time：2012-7-10 上午08:48:40

*TAG：@param filePath

*TAG：@return

*Return：String

*/

public static String readFile(String filePath){

FileInputStream fis = null;

byte[] mByte = new byte[512];

try {

fis = new FileInputStream(new File(filePath));

fis.read(mByte);

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}finally{

try {

if(null!=fis)

fis.close();

} catch (IOException e) {

e.printStackTrace();

}

}

return new String(mByte).toString();

}

}

}