CODEWITHSUNDEEP
androidserializationandroid-activityandroid-filedata-access
Cristiano
Cristiano

Reputation: 3199

How to write file to Android device from outside of activity?

I have main activity where I'm creating a new object called fileSaver. I'm trying to sarialize object 'data' to file. FileSave has a method serialize() which creates file.

private String FILE_NAME = "file.dat";
FileSaver fileSaver = new FileSaver();
Data data = new Data();
data.setEmail("[email protected]");
fileSaver.serialize((Object) data,FILE_NAME);

The problem is that I can't create a file outside activity. When I try the same inside activity, it creates that file. I was experimenting with paths but without success. I know when the file is created from activity it is saved in /data/data/my_package_name/files but how to access that file from outside activity class?

Class FileSaver:

public class FileSaver {

public void serialize(Object objToSerialize,String fileName) {

    try {
        ObjectOutputStream out = new ObjectOutputStream(
                new FileOutputStream(fileName));
        out.writeObject(objToSerialize);
        out.close();
        System.out.println("Object : " + objToSerialize.getClass()
                + " serialized successfully");
    } catch (Exception ex) {
        System.out.println("Error Saving Object to File :"
                + ex.getMessage());
        ex.printStackTrace();
    }
}
}

Thank you.

Upvotes: 2

Views: 1270

Answers (2)

Debarshi Dutta
Debarshi Dutta

Reputation: 442

You can save the file in the SDCARD instead.

ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(Environment.getExternalStorageDirectory()+File.separator+filename));

//here filename is your input filename in String and Environment.getExternalStorageDirectory() gives you the SDCard directory.

Also make sure you add the <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> in the Android Manifest file

Upvotes: 0

kumar_android
kumar_android

Reputation: 2263

you have to pass context to outside java class and using the context, use this openFileOutput() method to create and write a file in android device memory

Upvotes: 1

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