[android help] Can not update Value

Can not update Value

I have a class(constant.class). Which contain all the constant value that needs to be updated. I have a method in main activity. It update constant value(a url) and execute a view class(contain webview). But the value of url can not update in constant.class. so in the view the webview looks white. I have to update the value of url in constant.class. here is my constant class:

public class Constant {

public static boolean isCapturedOk = false;

public static int imagePickerStatus = -1;

public static byte[] imageData;

public static int result = 0;

public static String printUrl = "";

public static String rotationValue="";

public static String rotationValueForCamera="";

public static boolean isPrintButtonVisible = true;

}

Here is my View class:

public class PrintView extends LinearLayout {

WebView wev;
public PrintView(Context context) {
    super(context);
    // TODO Auto-generated constructor stub
    View.inflate(context, R.layout.printscreen, this);
    wev = (WebView) findViewById(R.id.webViewPrint);
    wev.loadUrl("http://www.vividworks.com/");

}

public PrintView(Context context, AttributeSet attrs, int defStyle) {
    super(context);
    // TODO Auto-generated constructor stub
    View.inflate(context, R.layout.printscreen, this);
    wev = (WebView) findViewById(R.id.webViewPrint);
    wev.loadUrl("http://www.vividworks.com/");

}

public PrintView(Context context, AttributeSet attrs) {
    super(context);
    // TODO Auto-generated constructor stub
    View.inflate(context, R.layout.printscreen, this);
    wev = (WebView) findViewById(R.id.webViewPrint);
    wev.loadUrl("http://www.vividworks.com/");

}



@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
    // TODO Auto-generated method stub
    for(int i = 0 ; i < getChildCount() ; i++){
        getChildAt(i).layout(l, t, r, b);
    }
}

}

Here is the method in main activity:

  public void loadPrintActivity(String printUrl){
   Constant.printUrl = printUrl;
   Constant.isPrintButtonVisible  =true;
   pv.setVisibility(View.VISIBLE);}

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