(Android™) File Read Blocks

Demonstrates how to read a file in fixed-size blocks (except for the very last block).

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Demonstrates how to read a file in blocks,
    // which can be useful when uploading to cloud storage
    // services such as Azure, S3, Google, etc.

    // For this example, we're simply writing the blocks
    // to an output file, and then checking to see if the
    // resulting file contents equals the original file contents.

    CkByteData dataBlock = new CkByteData();

    CkFileAccess facSrc = new CkFileAccess();
    CkFileAccess facDest = new CkFileAccess();

    String srcPath = "qa_data/xml/hamlet.xml";
    String destPath = "qa_output/hamletOut.xml";

    boolean success = facSrc.OpenForRead(srcPath);
    success = facDest.OpenForWrite(destPath);
    // Assuming success for the example..

    // How many 1024-byte blocks?  (Including 1 for the last partial block)
    int numBlocks = facSrc.GetNumBlocks(1024);

    int i = 0;
    while ((i < numBlocks)) {
        success = facSrc.ReadBlock(i,1024,dataBlock);
        if (facSrc.get_LastMethodSuccess() != true) {
            Log.i(TAG, facSrc.lastErrorText());
            return;
            }

        success = facDest.FileWrite(dataBlock);
        if (success != true) {
            Log.i(TAG, facDest.lastErrorText());
            return;
            }

        i = i + 1;
        }

    facSrc.FileClose();
    facDest.FileClose();

    boolean bEqual = facSrc.FileContentsEqual(srcPath,destPath);
    if (bEqual != true) {
        Log.i(TAG, "Something went wrong!");
        return;
        }

    Log.i(TAG, "File successfully copied by blocks.");

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}