Android static vs nonstatic issue

I've been trying to call the following:

public static void startfile() {
    Log.i("File Works", "working2 ");

    try {
        FileOutputStream fos = openFileOutput("sdcard/sdtext.txt", MODE_WORLD_WRITEABLE);
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

I get an error that tells me that "Cannot make a static reference to the non-static method openFileOutput(String, int) from the type ContextWrapper"

So I searched for that error and found this site.

I implemented this:

public static void startfile(Trackfile O) {
    Log.i("File Works", "working2 ");
    O.nonstatstartfile();
}

public void nonstatstartfile(){
    Log.i("File Works", "nonStat");
    try {
        FileOutputStream fos = openFileOutput("sdcard/sdtext.txt", MODE_WORLD_WRITEABLE);
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } 
}

When I call startfile from another 开发者_开发问答class getting a Null pointer error. What argument do I need to send to avoid the null pointer error?

You can pass context from activity like below

public static void startfile(Context c) {
    Log.i("File Works", "working2 ");

    try {
        FileOutputStream fos = c.openFileOutput("sdcard/sdtext.txt", MODE_WORLD_WRITEABLE);
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

public void startfile() {
    Log.i("File Works", "working2 ");

    try {
        FileOutputStream fos = openFileOutput("sdcard/sdtext.txt", MODE_WORLD_WRITEABLE);
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

Add this method to your class, and use it without problems. If you need it in main class, use it over object.