CODEWITHSUNDEEP
androidsharedpreferences
Denis Lolik
Denis Lolik

Reputation: 329

How to reset all data in android app programmatically?

I want to create a reset button in Settings. When I'll press this button, all data and shared preferences must be deleted like when I press to Clear data in Manage applications option.

Is there any way to do that?

public class Settings extends MainActivity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_settings);
}

 public static void delete(File file, boolean deleteDir) 
 {
        if (file.isDirectory()) {
            File[] files = file.listFiles();
            if (files != null) {
                for (File f : files) {
                    delete(f, true);
                }
            }
            if (deleteDir) {
                file.delete();
            }
        } else {
            file.delete();
        }
  }

 public static void clearData(Context context) 
 {
        File files = context.getDir("tmp", Context.MODE_PRIVATE);
        delete(files.getParentFile(), false);
 }

public void OnClickReset(View v)
{
    clearData(this);
}

}

Upvotes: 1

Views: 3137

Answers (1)

Oleksii K.
Oleksii K.

Reputation: 5419

I'm not sure, but I think you can use method Context.getFilesDir(). It returns File object which refers on internal app directory.

After that you can access to parent directory and delete all content of it.

EDITED:

Well, this code works:

File AppUtils.java

import android.content.Context;
import java.io.File;

public class AppUtils {    
    public static void delete(File file, boolean deleteDir) {
        if (file.isDirectory()) {
            File[] files = file.listFiles();
            if (files != null) {
                for (File f : files) {
                    delete(f, true);
                }
            }

            if (deleteDir) {
                file.delete();
            }
        } else {
            file.delete();
        }
    }

    public static void clearData(Context context) {
        File files = context.getDir("tmp", Context.MODE_PRIVATE);
        delete(files.getParentFile(), false);
    }
}

But I use method getDir() instead of getFilesDir() because second one may return null.

NOTE: If you will have opened SharedPreferences.Editor, then you won't delete it! Also, opened database or any opened file descriptor may cause same issue.

Upvotes: 2

Related Questions