<?xml version="1.0" encoding="utf-8"?>

<resources>

<string name="hello">Hello World, FileRW!</string>

<string name="app_name">文件读写</string>

<string name="file_name">文件名</string>

<string name="file_content">文件内容</string>

<string name="button_file_save">保存</string>

<string name="button_file_read">读取</string>

<string name="file_save_success">保存文件成功</string>

<string name="file_save_failed">保存文件失败</string>

<string name="file_read_failed">读取文件失败</string>

</resources>

<?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">

<!-- 文件名 -->

<TextView android:layout_width="fill_parent"

android:layout_height="wrap_content" android:text="@string/file_name" />

<EditText android:layout_width="fill_parent"

android:layout_height="wrap_content" android:id="@+id/et_file_name" />

<!-- 文件内容 -->

<TextView android:layout_width="fill_parent"

android:layout_height="wrap_content" android:text="@string/file_content" />

<EditText android:layout_width="fill_parent"

android:layout_height="wrap_content" android:minLines="3"

android:id="@+id/et_file_content" />

<!-- 保存和读取按钮，采用相对布局 -->

<RelativeLayout android:layout_width="fill_parent"

android:layout_height="wrap_content">

<!-- 保存按钮 -->

<Button android:layout_width="wrap_content"

android:layout_height="wrap_content" android:text="@string/button_file_save"

android:id="@+id/bt_save" />

<!-- 读取按钮 -->

<Button android:layout_width="wrap_content"

android:layout_height="wrap_content" android:layout_toRightOf="@id/bt_save"

android:text="@string/button_file_read" android:id="@+id/bt_read" />

</RelativeLayout>

</LinearLayout>

package com.changcheng.file.service;

import java.io.ByteArrayOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import android.content.Context;

public class FileService {

Context context;

public FileService(Context context) {

this.context = context;

}

/**

* 保存文件

*

* @param fileName

* @param fileContent

* @throws Exception

*/

public void save(String fileName, String fileContent) throws Exception {

// Activity的父类的父类就是context，context与其他框架中的context相同为我们以供了一些核心操作工具。

FileOutputStream fileOutputStream = this.context.openFileOutput(

fileName, Context.MODE_PRIVATE);

fileOutputStream.write(fileContent.getBytes());

}

/**

* 读取文件

*

* @param fileName

* @return

* @throws Exception

*/

public String read(String fileName) throws Exception {

FileInputStream fileInputStream = this.context.openFileInput(fileName);

ByteArrayOutputStream byteArray = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int len = 0;

while ((len = fileInputStream.read(buffer)) > 0) {

byteArray.write(buffer, 0, len);

};

return byteArray.toString();

}

}

package com.changcheng.file.event;

import com.changcheng.file.R;

import com.changcheng.file.service.FileService;

import android.app.Activity;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

/**

* 按钮事件类

* @author Administrator

*

*/

public class FileButtonOnClickEvent implements OnClickListener {

// 通过activity获取其他控件

private Activity activity;

// 通过FileService读写文件

private FileService fileService;

// 打印信息用的标签

private static final String TAG = "FileButtonOnClickEvent";

public FileButtonOnClickEvent(Activity activity) {

this.fileService = new FileService(activity);

this.activity = activity;

}

@Override

public void onClick(View v) {

Button button = (Button) v;

switch (button.getId()) {

case R.id.bt_save:

// 获取文件名

EditText etFileNameS = (EditText) this.activity

.findViewById(R.id.et_file_name);

String fileNameS = etFileNameS.getText().toString();

// 获取文件内容

EditText etFileConS = (EditText) this.activity

.findViewById(R.id.et_file_content);

String fileContentS = etFileConS.getText().toString();

// 保存

try {

this.fileService.save(fileNameS, fileContentS);

// 在窗口中显示一个特效信息框

Toast.makeText(this.activity, R.string.file_save_success,

Toast.LENGTH_LONG).show();

Log.i(TAG, "save file success!");

} catch (Exception e) {

Toast.makeText(this.activity, R.string.file_save_failed,

Toast.LENGTH_LONG).show();

Log.e(TAG, e.toString());

}

break;

case R.id.bt_read:

// 获取文件名

EditText etFileNameR = (EditText) this.activity

.findViewById(R.id.et_file_name);

String fileNameR = etFileNameR.getText().toString();

// 读取文件

try {

String fielContentR = this.fileService.read(fileNameR);

EditText etFileConR = (EditText) this.activity

.findViewById(R.id.et_file_content);

etFileConR.setText(fielContentR);

Log.i(TAG, "read file success!");

} catch (Exception e) {

Toast.makeText(this.activity, R.string.file_read_failed,

Toast.LENGTH_LONG).show();

Log.e(TAG, e.toString());

}

break;

default:

break;

}

}

}

package com.changcheng.file;

import com.changcheng.file.event.FileButtonOnClickEvent;

import android.app.Activity;

import android.os.Bundle;

import android.widget.Button;

public class FileRW extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

// 获取所有按钮

Button buttonRead = (Button) this.findViewById(R.id.bt_read);

Button buttonSave = (Button) this.findViewById(R.id.bt_save);

// 为按钮添加事件

FileButtonOnClickEvent fileBtOnClickEve = new FileButtonOnClickEvent(this);

buttonRead.setOnClickListener(fileBtOnClickEve);

buttonSave.setOnClickListener(fileBtOnClickEve);

}

}