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Adlight Sibanda
5,701 PointsWriting files
The following code is similar to what you just wrote. Modify this code to only write the file if it does not already exist. Hint: Use the method from the File class that checks to see if a file exists or not.
import java.io.InputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
public class FileUtilities {
public static boolean copyResult;
public static void saveAssetImage(Context context, String assetName) {
File fileToWrite = new File(context.getFilesDir(), assetName);
AssetManager assetManager = context.getAssets();
if (fileToWrite.exists() == false) { copyResult = copyFile(in, out); }
try {
InputStream in = assetManager.open(assetName);
FileOutputStream out = new FileOutputStream(fileToWrite);
copyResult = copyFile(in, out);
} catch(FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private static boolean copyFile(InputStream in, FileOutputStream out) {
// Copy magic intentionally omitted
return true;
}
}
2 Answers

Steve Hunter
57,684 PointsHi there,
You're very close indeed!! Rather than testing for .exists() == false
(which is odd; if it doesn't exist does it know that?) test for that being not true:
if(!fileToWrite.exists()){
copyResult = copyFile(in, out);
}
I hope that helps!
Steve.

Alwin Lazar V
5,267 PointsI have solved and it works for me
public class FileUtilities {
public static boolean copyResult;
public static void saveAssetImage(Context context, String assetName) {
File fileToWrite = new File(context.getFilesDir(), assetName);
AssetManager assetManager = context.getAssets();
try {
InputStream in = assetManager.open(assetName);
FileOutputStream out = new FileOutputStream(fileToWrite);
// here I changed
if (fileToWrite.exists() == false) { copyResult = copyFile(in, out); }
} catch(FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private static boolean copyFile(InputStream in, FileOutputStream out) {
// Copy magic intentionally omitted
return true;
}
}
Happy coding
[MOD: edited code block]

Steve Hunter
57,684 PointsGood work.
As in the above post, an alternative test to fileToWrite.exists() == false
, you can use !fileToWrite.exists()
- it amounts to the same thing.
Steve.
Adlight Sibanda
5,701 PointsAdlight Sibanda
5,701 PointsThanx Steve
seems in my code I had Capitalized: if (FileToWrite.exists() == false) { copyResult = copyFile(in, out); }
Instead of:
if (fileToWrite.exists() == false) { copyResult = copyFile(in, out); }
and it passed .... :-}
Steve Hunter
57,684 PointsSteve Hunter
57,684 PointsGreat work - glad you got it sorted out. :-)
Steve.