Android 在webview中设置代理

在android1.6之前的api中有有直接的方法来对webview设置代码，但是在之后的API中去掉了。所以只能寻求别的方法来设置代码。

下面代码是用反射原理来对webview设置代理：

publicstaticbooleansetProxy(Contextctx,Stringhost,intport){
booleanret=false;
try{
Log.d("WebViewProxySettings","setProxydefaulthost="+host+"port="+port);
ObjectrequestQueueObject=getRequestQueue(ctx);
if(requestQueueObject!=null){
//CreateProxyconfigobjectandsetitintorequestQ
HttpHosthttpHost=newHttpHost(host,port,"http");
setDeclaredField(requestQueueObject,"mProxyHost",httpHost);
ret=true;
}
}catch(Exceptione){
e.printStackTrace();
}
returnret;
}


publicstaticStringgetProxyHostname(Contextctx){
Stringres=null;
try{
ObjectrequestQueueObject=getRequestQueue(ctx);
if(requestQueueObject!=null){
Objectfild=getDeclaredField(requestQueueObject,"mProxyHost");
if(fild!=null){
HttpHosthost=(HttpHost)fild;
res=host.getHostName();
}
}
}catch(Exceptione){
e.printStackTrace();
}
returnres;
}

publicstaticvoidcancelProxy(Contextctx){
try{
ObjectrequestQueueObject=getRequestQueue(ctx);
if(requestQueueObject!=null){
setDeclaredField(requestQueueObject,"mProxyHost",null);
}
}catch(Exceptione){
e.printStackTrace();
}
}

publicstaticObjectgetRequestQueue(Contextctx)throwsException{
Objectret=null;
ClassnetworkClass=Class.forName("android.webkit.Network");
if(networkClass!=null){
ObjectnetworkObj=invokeMethod(networkClass,"getInstance",newObject[]{ctx},Context.class);
if(networkObj!=null){
ret=getDeclaredField(networkObj,"mRequestQueue");
}
}
returnret;
}

privatestaticObjectgetDeclaredField(Objectobj,Stringname)
throwsSecurityException,NoSuchFieldException,
IllegalArgumentException,IllegalAccessException{
Fieldf=obj.getClass().getDeclaredField(name);
f.setAccessible(true);
Objectout=f.get(obj);
//System.out.println(obj.getClass().getName()+"."+name+"="+out);
returnout;
}

privatestaticvoidsetDeclaredField(Objectobj,Stringname,Objectvalue)
throwsSecurityException,NoSuchFieldException,
IllegalArgumentException,IllegalAccessException{
Fieldf=obj.getClass().getDeclaredField(name);
f.setAccessible(true);
f.set(obj,value);
}

privatestaticObjectinvokeMethod(Objectobject,StringmethodName,Object[]params,Class...types)throwsException{
Objectout=null;
Classc=objectinstanceofClass?(Class)object:object.getClass();
if(types!=null){
Methodmethod=c.getMethod(methodName,types);
out=method.invoke(object,params);
}else{
Methodmethod=c.getMethod(methodName);
out=method.invoke(object);
}
//System.out.println(object.getClass().getName()+"."+methodName+"()="+out);
returnout;
}