How to get height and width of Button

I have created an array of buttons. Now I want to find the height and width of the button, and for that, I have used getWidth() and getHeight(). But the thing is that it always returns 0. Why is this happening? I have send my code, please check if anything is wrong.

LinearLayout layoutVertical = (LinearLayout) findViewById(R.id.liVLayout);
LinearLayout rowLayout = null;
LayoutParams param = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT, 1);

public static void main(String[] args)
{
    DBFacade dbFacade = new DBFacade();
    dbFacade.pick();
}

//Create Button
for(int i=0;i<6;i++)
{
rowLayout=new LinearLayout(this);
rowLayout.setWeightSum(7);
layoutVertical.addView(rowLayout,param);

for(int j=0;j<7;j++)
{
m_pBtnDay[i][j]=new Button(this);

rowLayout.addView(m_pBtnDay[i][j],param);

m_pBtnDay[i][j].setOnLongClickLi开发者_如何转开发stener(this);

m_pBtnDay[i][j].setGravity(Gravity.CENTER_HORIZONTAL|Gravity.CENTER_VERTICAL);
m_pBtnDay[i][j].setTextSize(12);
}
}
x=m_pBtnDay[i][j].getWidth();
y=m_pBtnDay[i][j].getHeight();
Log.d("width",Integer.toString(x));
Log.d("Height",Integer.toString(y));
return true;

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Probably you are calling getWidth() and getHeight() too early: I think the UI has not been sized and laid out on the screen yet...
You can try to put that code inside this:

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    // Call here getWidth() and getHeight()
 }

---

Another way

ViewTreeObserver vto = button.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {

        width = button.getWidth();
        height = button.getHeight();
    }
});

---

put this in your loop

x =  m_pBtnDay[i][j].getWidth();
y =  m_pBtnDay[i][j].getHeight();
Log.d("width", Integer.toString(x));
Log.d("Height", Integer.toString(y));

try it

---

You try to use the count-variable "i" and "j" to use outside from both for-loops. That should raise an exception because the are only availabil in each for-block.

Try to make the output in the second for-loop...

for (int i = 0; i<6; i++)
{
    ...
    for(int j=0; j<7; j++)
    {
        ....   
        x =  m_pBtnDay[i][j].getWidth();
        y =  m_pBtnDay[i][j].getHeight();
        Log.d("width", Integer.toString(x));
        Log.d("Height", Integer.toString(y));
    }
}

---

You can override the following View method, called during the layout phase.

protected void onSizeChanged (int w, int h, int oldw, int oldh)

This seems more appropriate, as it expressly accounts for the zero width and height you're observing:

This is called during layout when the size of this view has changed. If you were just added to the view hierarchy, you're called with the old values of 0.

Parameters w Current width of this view. h Current height of this view. oldw Old width of this view. oldh Old height of this view.

See here.

---

Try this can also work:

btn.getDrawingCache().getHeight() and btn.getDrawingCache().getWidth()