我如何在Android中读取文本文件?

I want to read the text from a text file. In the code below, an exception occurs (that means it goes to the catch block). I put the text file in the application folder. Where should I put this text file (mani.txt) in order to read it correctly?

我想从文本文件中读取文本。在下面的代码中，出现了一个异常(这意味着它会进入catch块)。我将文本文件放在应用程序文件夹中。我应该把这个文本文件(mani.txt)放在哪里，以便正确地读取它?

    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();
    }

7 个解决方案

#1

Try this :

试试这个:

I assume your text file is on sd card

我假设你的文本文件在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());

following links can also help you :

以下链接也可以帮助你:

How can I read a text file from the SD card in Android?

我如何在Android中读取SD卡上的文本文件?

How to read text file in Android?

如何在Android中读取文本文件?

Android read text raw resource file

Android读取文本原始资源文件。

#2

If you want to read file from sd card. Then following code might be helpful for you.

如果你想从sd卡读取文件。下面的代码可能对您有帮助。

 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.
  }

    }

If you wan to read file from asset folder then

如果你想从资产文件夹中读取文件。

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

Or If you wan to read this file from res/raw foldery, where the file will be indexed and is accessible by an id in the R file:

或者，如果您想从res/raw foldery读取这个文件，该文件将被索引，并且可以通过R文件中的id访问:

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

Good example of reading text file from res/raw folder

从res/raw文件夹中读取文本文件的好例子。

#3

Put your text file in Asset Folder...& read file form that folder...

将你的文本文件放入资产文件夹…和读取文件格式的文件夹…

see below reference links...

参见下面参考链接……

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

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

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

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

Reading a simple text file

阅读一个简单的文本文件。

hope it will help...

希望这将有助于……

#4

First you store your text file in to raw folder.

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.");
}

#5

Try this

试试这个

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);
  }

#6

Try this code

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;
}

#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;
}