Viewの幅と高さを取得する方法を考える

View#getWidth();
View#getHeight();

@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
 
  setContentView(R.layout.main);
  LinearLayout ll = (LinearLayout) findViewById(R.id.main_layout);
 
  int width = ll.getWidth(); //この値が０になる
  int height = ll.getHeight(); //この値も０になる
}

private final static int FP = ViewGroup.LayoutParams.FILL_PARENT;
 
@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
 
  LinearLayout ll = new LinearLayout(this) {
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
      int width = w; //これで幅が取得できる
      int height = h; //これで高さが取得できる
    }
  };
  ll.setLayoutParams(mkParams(FP, FP));
 
  setContentView(ll);
}
 
private ViewGroup.LayoutParams mkParams(int w, int h) {
  return new ViewGroup.LayoutParams(w, h);
}