0

我有一个按钮，我想在 onClick 方法中创建一个文件，但我总是得到一个FileNotFoundException. 写入内部存储的权限已经在 manifest.xml 中

这是代码：

registerButton.setOnClickListener(new OnClickListener() 
    {
        @Override
        public void onClick(View v) 
        {
            try 
            {
                bufferedWriter = new BufferedWriter(new FileWriter("sample.txt"));
                bufferedWriter.write(getString(R.string.emailString));
                bufferedWriter.newLine();
                bufferedWriter.write(getString(R.string.passwordString));
                System.out.println("Done!");
            } 
            catch (IOException e) 
            {
                e.printStackTrace();
                Log.d("MainActivity", "Bad luck!");
            }
            finally
            {
                try
                {
                    if(bufferedWriter != null)
                        bufferedWriter.close();
                }
                catch (IOException e) 
                {
                    e.printStackTrace();
                    Log.d("MainActivity", "Sorry for that!");
                }
            }
        }
    });

以下是错误日志

03-28 01:00:11.537: W/System.err(2610): java.io.FileNotFoundException: /sample.txt: open failed: EROFS (Read-only file system)
03-28 01:00:11.557: W/System.err(2610): at libcore.io.IoBridge.open(IoBridge.java:406)
03-28 01:00:11.557: W/System.err(2610): at java.io.FileOutputStream.<init>(FileOutputStream.java:88)
03-28 01:00:11.567: W/System.err(2610): at java.io.FileOutputStream.<init>(FileOutputStream.java:73)
03-28 01:00:11.588: W/System.err(2610): at java.io.FileWriter.<init>(FileWriter.java:80)
03-28 01:00:11.588: W/System.err(2610): at
org.eirich.way.MainActivity$1.onClick(MainActivity.java:34)
03-28 01:00:11.607: W/System.err(2610): at android.view.View.performClick(View.java:3480)
03-28 01:00:11.607: W/System.err(2610): at android.view.View$PerformClick.run(View.java:13983)
03-28 01:00:11.628: W/System.err(2610): at android.os.Handler.handleCallback(Handler.java:605)
03-28 01:00:11.628: W/System.err(2610): at android.os.Handler.dispatchMessage(Handler.java:92)
03-28 01:00:11.647: W/System.err(2610): at android.os.Looper.loop(Looper.java:137)
03-28 01:00:11.667: W/System.err(2610): at android.app.ActivityThread.main(ActivityThread.java:4340)
03-28 01:00:11.667: W/System.err(2610): at java.lang.reflect.Method.invokeNative(Native Method)
03-28 01:00:11.687: W/System.err(2610): at java.lang.reflect.Method.invoke(Method.java:511)
03-28 01:00:11.687: W/System.err(2610): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
4

3 回答 3

3

在内部存储中创建文件为：

bufferedWriter = new BufferedWriter(new FileWriter(new 
                            File(getFilesDir()+"/sample.txt")));

因为目前您没有使用 file.use getFilesDir()传递目录路径，它返回文件系统上目录的绝对路径

于 2013-03-30T13:18:26.807 回答
1

这是因为您没有将目录路径传递给FileWriter.

采用：

bufferedWriter = new BufferedWriter(new FileWriter(newFile(getFilesDir()+File.separator+"sample.txt")));

反而：

bufferedWriter = new BufferedWriter(new FileWriter("sample.txt"));

甚至检查下面的链接，它可以帮助你。

向/从 Android 手机的内部存储器写入/读取文件

于 2013-03-30T13:19:28.167 回答
0

您可以使用以下功能写入内部存储openFileOutput：

String string = "My data";

FileOutputStream os = openFileOutput("sample.txt", Context.MODE_PRIVATE);
os.write(string.getBytes());
os.close();

And make sure you have the following permission :

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
于 2013-03-30T13:21:25.827 回答