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

Question

I am new to Android development   I need to read a text file from the SD card and display that text file  Is there any way to view a text file directly in Android or else how can I read and display the contents of a text file

User · Answer

package com example readfilefromexternalresource   import java io BufferedReader  import java io File  import java io FileNotFoundException  import java io FileReader  import java io IOException   import android app Activity  import android app ActionBar  import android app Fragment  import android os Bundle  import android os Environment  import android view LayoutInflater  import android view Menu  import android view MenuItem  import android view View  import android view ViewGroup  import android widget TextView  import android widget Toast  import android os Build   public class MainActivity extends Activity       private TextView textView        Override     protected void onCreate Bundle savedInstanceState               TODO Auto-generated method stub         super onCreate savedInstanceState           setContentView R layout main           textView    TextView findViewById R id textView           String state   Environment getExternalStorageState             if    state equals Environment MEDIA MOUNTED                  Toast makeText this   There is no any sd card   Toast LENGTH LONG  show                else               BufferedReader reader   null              try                   Toast makeText this   Sd card available   Toast LENGTH LONG  show                    File file   Environment getExternalStorageDirectory                    File textFile   new File file getAbsolutePath   File separator    chapter xml                    reader   new BufferedReader new FileReader textFile                    StringBuilder textBuilder   new StringBuilder                    String line                  while  line   reader readLine       null                        textBuilder append line                       textBuilder append   n                                       textView setText textBuilder                  catch  FileNotFoundException e                       TODO  handle exception                 e printStackTrace                  catch  IOException e                       TODO Auto-generated catch block                 e printStackTrace                              finally                  if reader    null                       try                           reader close                          catch  IOException e                               TODO Auto-generated catch block                         e printStackTrace

User · Answer

In response to      Don t hardcode  sdcard    Sometimes we HAVE TO hardcode it as in some phone models the API method returns the internal phone memory    Known types  HTC One X and Samsung S3    Environment getExternalStorageDirectory   getAbsolutePath   gives a different path - Android

User · Answer

You should have READ EXTERNAL STORAGE permission for reading sdcard  Add permission in manifest xml   lt uses-permission android name  android permission READ EXTERNAL STORAGE    gt    From android 6 0 or higher  your app must ask user to grant the dangerous permissions at runtime  Please refer this link Permissions overview  if  Build VERSION SDK INT  gt   Build VERSION CODES M        if  checkSelfPermission Manifest permission READ EXTERNAL STORAGE     PackageManager PERMISSION GRANTED            ActivityCompat requestPermissions this  new String   Manifest permission READ EXTERNAL STORAGE   0

User · Answer

In your layout you ll need something to display the text   A TextView is the obvious choice   So you ll have something like this    lt TextView      android id    id text view       android layout width  fill parent       android layout height  fill parent   gt    And your code will look like this     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     This could go in the onCreate   method of your Activity  or somewhere else depending on just what it is you want to do

User · Answer

Beware  some phones have 2 sdcards   an internal fixed one and a removable card  You can find the name of the last one via a standard app  Mijn Bestanden       in English   MyFiles       When I open this app  item all files  the path of the open folder is   sdcard   scrolling down there is an entry  external-sd    clicking this opens the folder   sdcard external sd     Suppose I want to open a text-file   MyBooks txt   I would use something as        String Filename     mnt sdcard external sd MyBooks txt       File file   new File fname     etc

User · Answer

BufferedReader br   null  try           String fpath   Environment getExternalStorageDirectory      lt your file name gt           try               br   new BufferedReader new FileReader fpath              catch  FileNotFoundException e1                e1 printStackTrace                      String line               while   line   br readLine       null               Do something here

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

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