cordova-android/framework/src/com/phonegap/WebViewReflect.java

package com.phonegap;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import android.webkit.WebSettings;

public class WebViewReflect {
	   private static Method mWebSettings_setDatabaseEnabled;

	   static 
	   {
		   checkCompatibility();
	   }
	   
	   private static void setDatabaseEnabled(boolean e) throws IOException {
		   try
		   {
			   mWebSettings_setDatabaseEnabled.invoke(e);
		   }
		   catch (InvocationTargetException ite) {
	           /* unpack original exception when possible */
	           Throwable cause = ite.getCause();
	           if (cause instanceof IOException) {
	               throw (IOException) cause;
	           } else if (cause instanceof RuntimeException) {
	               throw (RuntimeException) cause;
	           } else if (cause instanceof Error) {
	               throw (Error) cause;
	           } else {
	               /* unexpected checked exception; wrap and re-throw */
	               throw new RuntimeException(ite);
	           }
	       } catch (IllegalAccessException ie) {
	           System.err.println("unexpected " + ie);
	       }	   
	   }	   
	   
	   public static void checkCompatibility() {
	       try {
	           mWebSettings_setDatabaseEnabled = WebSettings.class.getMethod(
	                   "setDatabaseEnabled", new Class[] { boolean.class } );
	           /* success, this is a newer device */
	       } catch (NoSuchMethodException nsme) {
	           /* failure, must be older device */
	       }
	   }


	   public static void setStorage(WebSettings setting, boolean enable, String path) {
	       if (mWebSettings_setDatabaseEnabled != null) {
	           /* feature is supported */
	           setting.setDatabaseEnabled(enable);
	           setting.setDatabasePath(path);
	       } else {
	           /* feature not supported, do something else */
	           System.out.println("dump not supported");
	       }
	   }
}