Read Write File Manager : File « File « Android






  1. Android
  2. File
  3. File

Read Write File Manager

    

//package com.application.esmaker.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import android.content.Context;
import android.util.Log;
import android.widget.Toast;

public class ReadWriteFileManager {

  public void start(Context cx) {
    final String TEMP_FILE_NAME = "temp.txt";
    String contentToWrite = "THIS IS THE CONTENT TO WRITE!";

    Log.d("DEBUG", "Instantiating ReadWriteManager..");

    ReadWriteFileManager readWriteFileManager = new ReadWriteFileManager();

    Log.d("DEBUG", "Writing to file...");

    readWriteFileManager.writeToFile(cx, contentToWrite.getBytes(),
        TEMP_FILE_NAME);

    Log.d("DEBUG", "Reading from file..");

    String contentRead = readWriteFileManager.readFromFile(cx,
        TEMP_FILE_NAME);

    Log.d("DEBUG", "Content read: " + contentRead);

    Toast.makeText(cx, contentRead, Toast.LENGTH_LONG).show();
  }

  public String readFromFile(Context context, String sourceFileName) {
    /*
     * Reading will be file type specific.. Here I'm considering text file
     * alone..
     */
    FileInputStream fis = null;
    InputStreamReader isr = null;

    char[] inputBuffer = null;
    String file_content = null;

    try {
      // As this requires full path of the file...
      // i.e data/data/package_name/files/your_file_name
      File sourceFile = new File(context.getFilesDir().getPath()
          + File.separator + sourceFileName);

      if (sourceFile.exists()) {
        // Probably you will get an exception if its
        // a huge content file..
        // I suggest you to handle content here
        // itself, instead of
        // returning it as return value..
        inputBuffer = new char[(int) sourceFile.length()];

        fis = context.openFileInput(sourceFileName);

        isr = new InputStreamReader(fis);
        isr.read(inputBuffer);

        file_content = new String(inputBuffer);

        try {
          isr.close();
          fis.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }

    } catch (Exception e) {
      e.printStackTrace();
      file_content = null;
    }

    return file_content;
  }

  public boolean writeToFile(Context context, byte[] contentToWrite,
      String destinationFileName) {
    FileOutputStream fos = null;
    boolean retValue = false;
    try {
      // Note that your file will be created and stored
      // under the path: data/data/your_app_package_name/files/
      fos = context.openFileOutput(destinationFileName,
          Context.MODE_PRIVATE);

      // Note that we are not buffering of contents to write..
      // So, this will work best for files with less content....
      fos.write(contentToWrite);
      // Successfully completed writing..
      retValue = true;
      try {
        fos.flush();
        fos.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    } catch (Exception e) {
      // You can catch exceptions specifically for low mem,
      // file cant be created, and so on..
      e.printStackTrace();
      // Failed to write..
      retValue = false;
    }

    return retValue;
  }

}








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