安卓的FileReader意外抛出FileNotFoundException异常 [英] Android: FileReader unexpectedly throwing FileNotFoundException

问题描述

所以我意外收到FileNotFoundException异常。正如你所看到的，前不久我打电话的FileReader，我称之为的FileInputStream工作正常。我试图把的FileReader在自己的try / catch子句，但得到相同的结果。我已经烧毁大部分不必要的线路从该块我的问题。 （最后我呼吁LineNumberReader为好，但我删除它从块，因为我还没有得到那么远。）

So I'm unexpectedly receiving a FileNotFoundException. As you can see, shortly before I call the FileReader, I call FileInputStream which works fine. I've tried putting the FileReader in its own Try/Catch clause, but receive the same result. I've gutted most of the lines unnecessary to my question from this block. (Ultimately I call LineNumberReader as well, though I removed it from the block because I'm not even getting that far.)

        String FILENAME = "file.txt";
            try {
                    byte[] buffer = new byte[128];
                    String toStr = new String();
                    TextView view = (TextView)findViewById(R.id.textview);
                    FileInputStream fis = openFileInput(FILENAME); /////File is found successfully here/////
                    fis.read(buffer);
                    fis.close();
                    toStr = new String(buffer);
                    view.append(toStr);
                    FileReader fr = new FileReader(FILENAME); /////FileNotFoundExceptionThrownHere/////
                    /////do stuff here/////
                    fr.close();
                } 
             catch (FileNotFoundException e) {
                    TextView view = (TextView)findViewById(R.id.textview);
                    view.append("file not found!");
                } 
             catch (IOException e) {
                    TextView view = (TextView)findViewById(R.id.textview);
                    view.append("IO error!");
            }

此外，请记住在回答这个我还是有点新手，当涉及到Java的时候。我有一对夫妇的其他语言的经验，但Java是一个有点不同的品种怪物给我的。任何帮助将是巨大的AP preciated！

Also, please keep in mind when answering that I'm still somewhat of a novice when it comes to java. I have experience in a couple other languages but java is a bit of a different breed of monster to me. Any help would be tremendously appreciated!

推荐答案

openFileInput（）和新的FileReader（）不采取同样的参数。

openFileInput() and new FileReader() do not take the same parameter.

openFileInput（file.txt的）等同于新的FileReader（新文件（getFilesDir（），file.txt的）） 。

这篇关于安卓的FileReader意外抛出FileNotFoundException异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！