copies all files within a directory to another directory - Android java.io

Android examples for java.io:Directory

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Description

copies all files within a directory to another directory

Demo Code

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import android.util.Log;

public class Main {

  private static final String TAG = "";

  /**//from  w  w w .j a va  2  s .c  om
   * copies all files within a directory to another directory
   * 
   * @param destinationDirectory
   *          the target directory
   * @param sourceDirectory
   *          the source directory
   * @return true if all contents were copied successfully, false otherwise
   */
  public static boolean copyDirectoryContents(File destinationDirectory, File sourceDirectory) {
    if (destinationDirectory == null) {
      Log.e(TAG, "Unable to copy: destinationDirectory is null");
      return false;
    }
    if (sourceDirectory == null) {
      Log.e(TAG, "Unable to copy: sourceDirectory is null");
      return false;
    }

    // If the source and destination directories exist then copy the files
    if (sourceDirectory.exists() && sourceDirectory.isDirectory() && destinationDirectory.exists()
        && destinationDirectory.isDirectory() && destinationDirectory.canWrite()) {

      List<String> failedCopy = null;
      for (File fileToCopy : sourceDirectory.listFiles()) {
        // Find and copy the file to the output directory
        Log.i(TAG, "Copying link file [" + fileToCopy.getName() + "] from [" + sourceDirectory.getAbsolutePath()
            + "] to [" + destinationDirectory + "]");

        if (!copyFile(destinationDirectory, fileToCopy, fileToCopy.getName())) {
          if (failedCopy == null) {
            failedCopy = new ArrayList<String>();
          }
          failedCopy.add(fileToCopy.getName());
        }
      }

      if (failedCopy != null) {
        // Report on the files that could not be copied
        Log.w(TAG, "Failed to copy the following files: ");
        for (String fileName : failedCopy) {
          Log.w(TAG, "\t [" + fileName + "]");
        }
      } else {
        return true;
      }
    }

    return false;
  }

  /**
   * Copy copy file sourceFile to the directory destination directory
   * 
   * @param destinationDirectory
   *          location where the file to be copied
   * @param sourceFile
   *          the location of the file to copy
   * @param targetFileName
   *          name of the target file
   * @return true if the file was copied successfully, false otherwise
   */
  public static boolean copyFile(final File destinationDirectory, final File sourceFile, final String targetFileName) {
    boolean _return = false;

    if (null != destinationDirectory && null != sourceFile) {
      FileInputStream inputStream = null;
      FileOutputStream outputStream = null;
      byte[] dataBuffer = new byte[1024];
      File outputFile = new File(destinationDirectory.getAbsoluteFile() + File.separator + targetFileName);
      try {
        inputStream = new FileInputStream(sourceFile);
        outputStream = new FileOutputStream(outputFile);

        try {
          int bytesRead = inputStream.read(dataBuffer);
          while (-1 != bytesRead) {
            outputStream.write(dataBuffer, 0, bytesRead);
            bytesRead = inputStream.read(dataBuffer);
          }

          // No errors copying the file, look like we're good
          _return = true;
        } catch (IOException e) {
          Log.w(TAG, "IOException trying to write copy file [" + sourceFile.getAbsolutePath() + "] to ["
              + destinationDirectory.getAbsolutePath() + "]: [" + e.getMessage() + "]");
        }
      } catch (FileNotFoundException e) {
        Log.w(TAG, "File not found exception trying to write copy file [" + sourceFile.getAbsolutePath() + "] to ["
            + destinationDirectory.getAbsolutePath() + "]: [" + e.getMessage() + "]");
      }
    }
    return _return;
  }

}

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