Android中WebView加载的网页被放大的解决办法

int screenDensity = getResources().getDisplayMetrics().densityDpi; 
   Logger.d(TAG, "screenDensity = " + screenDensity); 
   WebSettings.ZoomDensity zoomDensity = WebSettings.ZoomDensity.MEDIUM; 
   switch (screenDensity) 
   { 
     case DisplayMetrics.DENSITY_LOW: 
       zoomDensity = WebSettings.ZoomDensity.CLOSE; 
       break; 
     case DisplayMetrics.DENSITY_MEDIUM: 
       zoomDensity = WebSettings.ZoomDensity.MEDIUM; 
       break; 
     case DisplayMetrics.DENSITY_HIGH: 
     case DisplayMetrics.DENSITY_XHIGH: 
     case DisplayMetrics.DENSITY_XXHIGH: 
     default: 
       zoomDensity = WebSettings.ZoomDensity.FAR; 
       break; 
   } 
   webSettings.setDefaultZoom(zoomDensity);