Using Application context everywhere?

In an Android app, is there anything wrong with the following approach:

Android - what"s the difference between the various methods to get a Context?

In various bits of Android code I've seen:

public class MyActivity extends Activity {

    public void method() {

       mContext = this;    // since Activity extends Context

       mContext = getApplicationContext();

       mContext = getBaseContext();

    }

 }