如何在Android中读取文本文件？

我想从文本文件中读取文本。 在下面的代码中，发生了一个exception（这意味着它进入catch块）。 我把文本文件放在应用程序文件夹中。 我应该在哪里把这个文本文件（mani.txt）为了正确的阅读？

  try { InputStream instream = openFileInput("E:\\test\\src\\com\\test\\mani.txt"); if (instream != null) { InputStreamReader inputreader = new InputStreamReader(instream); BufferedReader buffreader = new BufferedReader(inputreader); String line,line1 = ""; try { while ((line = buffreader.readLine()) != null) line1+=line; }catch (Exception e) { e.printStackTrace(); } } } catch (Exception e) { String error=""; error=e.getMessage(); } 

Answer 1

尝试这个 ：

我假设你的文本文件是在SD卡上

  //Find the directory for the SD Card using the API //*Don't* hardcode "/sdcard" File sdcard = Environment.getExternalStorageDirectory(); //Get the text file File file = new File(sdcard,"file.txt"); //Read text from file StringBuilder text = new StringBuilder(); try { BufferedReader br = new BufferedReader(new FileReader(file)); String line; while ((line = br.readLine()) != null) { text.append(line); text.append('\n'); } br.close(); } catch (IOException e) { //You'll need to add proper error handling here } //Find the view by its id TextView tv = (TextView)findViewById(R.id.text_view); //Set the text tv.setText(text.toString()); 

以下链接也可以帮助您：

如何从Android的SD卡读取文本文件？

如何阅读Android中的文本文件？

Android阅读文本原始资源文件

Answer 2

如果你想从SD卡读取文件。 那么下面的代码可能对你有帮助。

  StringBuilder text = new StringBuilder(); try { File sdcard = Environment.getExternalStorageDirectory(); File file = new File(sdcard,"testFile.txt"); BufferedReader br = new BufferedReader(new FileReader(file)); String line; while ((line = br.readLine()) != null) { text.append(line); Log.i("Test", "text : "+text+" : end"); text.append('\n'); } } catch (IOException e) { e.printStackTrace(); } finally{ br.close(); } TextView tv = (TextView)findViewById(R.id.amount); tv.setText(text.toString()); ////Set the text to text view. } } 

如果你想从资产文件夹中读取文件，那么

 AssetManager am = context.getAssets(); InputStream is = am.open("test.txt"); 

或者如果你想从res/raw foldery中读取这个文件，那么这个文件将被编入索引，并且可以被R文件中的一个id访问：

 InputStream is = getResources().openRawResource(R.raw.test); 

从res / raw文件夹读取文本文件的好例子

Answer 3

将您的文本文件放在资源文件夹中…并读取文件夹中的文件…

见下面的参考链接…

http://www.technotalkative.com/android-read-file-from-assets/

http://sree.cc/google/reading-text-file-from-assets-folder-in-android

读一个简单的文本文件

希望这将有助于…

Answer 4

首先，将文本文件存储到原始文件夹中。

 private void loadWords() throws IOException { Log.d(TAG, "Loading words..."); final Resources resources = mHelperContext.getResources(); InputStream inputStream = resources.openRawResource(R.raw.definitions); BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream)); try { String line; while ((line = reader.readLine()) != null) { String[] strings = TextUtils.split(line, "-"); if (strings.length < 2) continue; long id = addWord(strings[0].trim(), strings[1].trim()); if (id < 0) { Log.e(TAG, "unable to add word: " + strings[0].trim()); } } } finally { reader.close(); } Log.d(TAG, "DONE loading words."); } 

Answer 5

尝试这个

 try { reader = new BufferedReader(new InputStreamReader(in,"UTF-8")); } catch (UnsupportedEncodingException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } String line=""; String s =""; try { line = reader.readLine(); } catch (IOException e) { e.printStackTrace(); } while (line != null) { s = s + line; s =s+"\n"; try { line = reader.readLine(); } catch (IOException e) { e.printStackTrace(); } } tv.setText(""+s); } 

Answer 6

试试这个代码

 public static String pathRoot = "/sdcard/system/temp/"; public static String readFromFile(Context contect, String nameFile) { String aBuffer = ""; try { File myFile = new File(pathRoot + nameFile); FileInputStream fIn = new FileInputStream(myFile); BufferedReader myReader = new BufferedReader(new InputStreamReader(fIn)); String aDataRow = ""; while ((aDataRow = myReader.readLine()) != null) { aBuffer += aDataRow; } myReader.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return aBuffer; } 

Answer 7

 // working public static String getStringFromFile (String filename) throws Exception { //Find the directory for the SD Card using the API //*Don't* hardcode "/sdcard" File sdcard = Environment.getExternalStorageDirectory(); //Get the text file File file = new File(sdcard,filename); FileInputStream fin = new FileInputStream(file); String ret = convertStreamToString(fin); //Make sure you close all streams. fin.close(); return ret; }