android WebView设置setInitialScale(...)后，修改设置的值，问题解决

package com.hy; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import android.app.Activity; import android.graphics.Color; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.webkit.WebSettings; import android.webkit.WebView; import android.widget.Button; /** * 通过反射调用,修改webview的mInitialScaleInPercent初始值 * @author yang_hao * 2012-5-9 15:01:49 */ public class WebView_ChangeScaleValueActivity extends Activity implements OnClickListener{ private Button btn; private WebView mWebView; private WebSettings mWebSetting; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); String url = "http://yueyang.2smtc.com/upload/user/20081223125326.jpg"; mWebView = (WebView)this.findViewById(R.id.webview); btn = (Button)this.findViewById(R.id.btn); mWebView.setBackgroundColor(Color.BLACK); mWebView.setInitialScale(100);//设置缩放比例 mWebSetting = mWebView.getSettings(); mWebView.loadUrl(url); btn.setOnClickListener(this); } public static void setScaleValue(View view){ Class classType; Method method = null; try { classType = WebView.class; ; for(Method item :classType.getDeclaredMethods()){ if(item.getName().equals("setNewZoomScale")){ method=item; } } method.setAccessible(true); ////修改缩放比例1.0f为图片正常, method.invoke(view, new Object[] {0.5f,true,true}); } catch (SecurityException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } } @Override public void onClick(View v) { if(btn==v){ setScaleValue(mWebView); //修改缩放比例 } } }