Android - 只读文件系统 IOException

问题描述

我正在尝试在 Android 系统上写入一个简单的文本文件.这是我的代码:

I am trying to write to a simple text file on the Android system. This is my code:

public void writeClassName() throws IOException{
    String FILENAME = "classNames";
    EditText editText = (EditText) findViewById(R.id.className);
    String className = editText.getText().toString();

    File logFile = new File("classNames.txt");
       if (!logFile.exists())
       {
          try
          {
             logFile.createNewFile();
          } 
          catch (IOException e)
          {
             // TODO Auto-generated catch block
             e.printStackTrace();
          }
       }
       try
       {
          //BufferedWriter for performance, true to set append to file flag
          BufferedWriter buf = new BufferedWriter(new FileWriter(logFile, true)); 
          buf.append(className);
          buf.newLine();
          buf.close();
       }
       catch (IOException e)
       {
          // TODO Auto-generated catch block
          e.printStackTrace();
       }

但是，此代码会产生java.io.IOException:打开失败:EROFS(只读文件系统)"错误.我尝试按如下方式向我的清单文件添加权限，但没有成功:

However, this code produces a "java.io.IOException: open failed: EROFS (Read-only file system)" error. I have tried adding permissions to my Manifest file as follows with no success:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="hellolistview.com"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="15" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:name=".ClassView"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

     <activity 
        android:name=".AddNewClassView" 
        />

</application>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

有谁知道问题出在哪里?

Anyone have any idea what the problem is?

推荐答案

因为你正在尝试将文件写入root，所以你需要将文件路径传递给你的文件目录.

Because you are trying to write the file to root, you need to pass the file path to your file directory.

例子

String filePath = context.getFilesDir().getPath().toString() + "/fileName.txt";
File f = new File(filePath);

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