Android中文件简单存储（写入 读取）

package cn.tedu.file;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity implements View.OnClickListener {
private EditText etTitle;
private EditText etContent;
private Button btnSubmit;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

etTitle = (EditText) findViewById(R.id.et_title);
etContent = (EditText) findViewById(R.id.et_content);
btnSubmit = (Button) findViewById(R.id.btn_submit);

btnSubmit.setOnClickListener(this);

// 从文件中读取内容
FileInputStream fis = null;
InputStreamReader isr = null;
BufferedReader br = null;
String title = null;
String content = null;

try {
fis = openFileInput("riji.txt");
isr = new InputStreamReader(fis);
br = new BufferedReader(isr);

title = br.readLine();
content = br.readLine();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if(br != null) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

// 将读取到的内容显示在控件上
etTitle.setText(title);
etContent.setText(content);
}

@Override
public void onClick(View v) {
// 读取数据
String title = etTitle.getText().toString().trim();
String content = etContent.getText().toString();

// 数据验证

// 保存到文件
FileOutputStream fos = null;
PrintWriter pw = null;

try {
fos = openFileOutput("riji.txt", MODE_PRIVATE);
pw = new PrintWriter(fos);
pw.println(title);
pw.println(content);
pw.flush();
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
if(pw != null) {
pw.close();
}
}

// 提示
Toast.makeText(this, "保存成功！！！", Toast.LENGTH_SHORT).show();
}
}