Android – Read text file from SD-card
-
Paresh Mayani
- November 21, 2011
- 1 min read
- 3 Comments
Problem: How to read simple text file from SD-card?
Description:
First of all, let me give you a link: Environment class and getExternalStorageDirectory() method, through this method we gets the root directory of sd-card, because if we write only “/sdcard” as a static value then there may be a chance of problem because there may be having /mnt/sdcard as a root directory in some of android devices.
Now, we use this method as below:
File dir = Environment.getExternalStorageDirectory();
And the rest of the procedure I have given and described by making comments in the example so now go through the full solutions provided below with the output snap.
Solution:
ReadFileSDCardActivity.java
package com.paresh.readfilesdcard;
package com.paresh.readfilesdcard;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.widget.TextView;
/**
* @author Paresh N. Mayani
* @Website https://technotalkative.com
*/
public class ReadFileSDCardActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//Find the view by its id
TextView tv = (TextView)findViewById(R.id.fileContent);
File dir = Environment.getExternalStorageDirectory();
//File yourFile = new File(dir, "path/to/the/file/inside/the/sdcard.ext");
//Get the text file
File file = new File(dir,"text.txt");
// i have kept text.txt in the sd-card
if(file.exists()) // check if file exist
{
//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');
}
}
catch (IOException e) {
//You'll need to add proper error handling here
}
//Set the text
tv.setText(text);
}
else
{
tv.setText("Sorry file doesn't exist!!");
}
}
}
Download Full source code from here: Android – Read text file from SD-Card.
