content view width and height

Question

I am using below steps to know the width and height of contentview on my display screen

ContentViewWidth = getWindow().findViewById(Window.ID_ANDROID_CONTENT         


        

Answer 1

Here's what I did in my activity to figure out the content layout of a particular view child that I knew stretched end-to-end on the screen (a webview in this case):

First, inherit from OnGlobalLayoutListener:

public class ContainerActivity extends Activity implements ViewTreeObserver.OnGlobalLayoutListener {
...

Next, implement onGlobalLayout method of listener's interface (note I do some pixel calcs that pertain to figuring out the medium-zoom dip :

@Override
public void onGlobalLayout() {
    int nH = this.mWebView.getHeight();
    int nW = this.mWebView.getWidth();

    if (nH > 0 && nW > 0)
    {
        DisplayMetrics oMetrics = new DisplayMetrics();

        this.getWindowManager().getDefaultDisplay().getMetrics(oMetrics); 

        nH = (nH * DisplayMetrics.DENSITY_DEFAULT) / oMetrics.densityDpi;
        nW = (nW * DisplayMetrics.DENSITY_DEFAULT) / oMetrics.densityDpi;

        // do something with nH and nW                  

        this.mWebView.getViewTreeObserver().removeGlobalOnLayoutListener
            ( this
            );

            ...         
    }
}

Finally, make sure to tell the view element (mWebView in this case) inside onCreate() that you're listening to layout events:

this.setContentView(this.mWebView = new WebView(this));

this.mWebView.getViewTreeObserver().addOnGlobalLayoutListener
    ( this
    );

This approach works for older android versions. I believe ics+ has a layout listener for each view you can bind to, and as such, would be used in a similar way.