How do I read the file content from the Internal storage - Android App

Question

I am a newbie working with Android  A file is already created in the location data data myapp files hello txt  the contents of this file is  hello   How do I read the file s content

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For others looking for an answer to why a file is not readable especially on a sdcard  write the file like this first   Notice the MODE WORLD READABLE  try               FileOutputStream fos   Main this openFileOutput  exported data csv   MODE WORLD READABLE               fos write csv getBytes                 fos close                File file   Main this getFileStreamPath  exported data csv                return file getAbsolutePath              catch  Exception e                e printStackTrace                return null

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Call To the following function with argument as you file path   private String getFileContent String targetFilePath              File file   new File targetFilePath              try                       fileInputStream   new FileInputStream file                             catch  FileNotFoundException e                         TODO Auto-generated catch block                   Log e       e printStackTrace                             StringBuilder sb             while fileInputStream available    gt  0                      if null   sb   sb   new StringBuilder                 sb append  char fileInputStream read                         String fileContent         if null  sb               fileContent  sb toString                   This is your fileContent in String                    try             fileInputStream close                    catch Exception e                 TODO Auto-generated catch block            Log e       e printStackTrace                         return fileContent

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To read a file from internal storage      Call openFileInput   and pass it the name of the file to read  This   returns a FileInputStream  Read bytes from the file with read    Then   close the stream with close      code    StringBuilder sb   new StringBuilder            try              BufferedReader reader   new BufferedReader new InputStreamReader is   UTF-8                 String line   null              while   line   reader readLine       null                    sb append line  append   n                              is close              catch OutOfMemoryError om               om printStackTrace              catch Exception ex               ex printStackTrace                      String result   sb toString

User · Answer

Read a file as a string full version  handling exceptions  using UTF-8  handling new line       Calling          Context context   getApplicationContext        String filename    log txt       String str   read file context  filename        public String read file Context context  String filename            try               FileInputStream fis   context openFileInput filename               InputStreamReader isr   new InputStreamReader fis   UTF-8                BufferedReader bufferedReader   new BufferedReader isr               StringBuilder sb   new StringBuilder                String line              while   line   bufferedReader readLine       null                    sb append line  append   n                              return sb toString              catch  FileNotFoundException e                return               catch  UnsupportedEncodingException e                return               catch  IOException e                return                       Note  you don t need to bother about file path only with file name

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I prefer to use java util Scanner   try       Scanner scanner   new Scanner context openFileInput filename   useDelimiter    Z        StringBuilder sb   new StringBuilder         while  scanner hasNext              sb append scanner next                scanner close         String result   sb toString       catch  IOException e

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String path   Environment getExternalStorageDirectory   toString        Log d  Files    Path      path       File f   new File path       File file     f listFiles        Log d  Files    Size      file length       for  int i   0  i  lt  file length  i                here populate your listview         Log d  Files    FileName     file i  getName

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Take a look this how to use storages in android http   developer android com guide topics data data-storage html filesInternal  To read data from internal storage you need your app files folder and read content from here   String yourFilePath   context getFilesDir            hello txt   File yourFile   new File  yourFilePath      Also you can use this approach  FileInputStream fis   context openFileInput  hello txt    InputStreamReader isr   new InputStreamReader fis   BufferedReader bufferedReader   new BufferedReader isr   StringBuilder sb   new StringBuilder    String line  while   line   bufferedReader readLine       null        sb append line

[android] How do I read the file content from the Internal storage - Android App

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