Qt5.6 安卓下的WebView如何實現(xiàn)JavaScript通信？

時間：2018-11-16 12:12:01

關鍵字： QT webview javascript通信

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[導讀]Qt官方的Webview僅僅在Qtquick中支持安卓和ios,安卓的官方實現(xiàn)是調(diào)用安卓系統(tǒng)自帶的瀏覽器API,但是Qt官方?jīng)]有寫js交互,于是研究了一通宵得出幾個解決方案: 1.使用Qt官方的QM

Qt官方的Webview僅僅在Qtquick中支持安卓和ios,安卓的官方實現(xiàn)是調(diào)用安卓系統(tǒng)自帶的瀏覽器API,但是Qt官方?jīng)]有寫js交互,于是研究了一通宵得出幾個解決方案: 1.使用Qt官方的QML webview和HTML5的Websockt,在js中使用websockt,在qt qucik中使用websocket服務器,結果可行,可惜安卓很多版本不支持Websockt,于是乎3個小時過去了。

2.既然websockt行不通，就想了下socket.io庫,能運行~可惜qt quick的Websockt服務器不支持socket.io的協(xié)議,于是乎 3小時又浪費了

3.使用HTML sockt或post,post要執(zhí)行的函數(shù),用QML的eval函數(shù)來執(zhí)行字符串代碼,于是乎用xhl來發(fā)送post數(shù)據(jù),然后用C++建立TcpSocket來接收,但是我放棄了,解析HTML封包不劃算,為了發(fā)送4個字符他會發(fā)一大堆HTML協(xié)議字符串…因為 socket由C++接收.websockt在 qt quick中,js post->sockt->qt quick 要跨3層交互才收的到數(shù)據(jù),實在蛋疼…更重要的是還要避免意外情況,于是乎2小時又浪費了

4.最后花了5個小時,在國外看到一些開源代碼,經(jīng)過修改實現(xiàn)了原生交互,依然是調(diào)用安卓的webview,內(nèi)嵌到qt中具體實現(xiàn):c++ –> java ?–> js

因為安卓的瀏覽器和java的交互是最穩(wěn)定的

先生成Qt 安卓項目，先編譯一次,在目錄下新建android文件夾(QT中可以創(chuàng)建) 和 assets文件夾

把androud-build中的src目錄下全部文件復制到android目錄,打開eclipse,在QtActivity包下添加一個類:
下面代碼是參考過來的:

package?org.qtproject.qt5.android.bindings;

public?interface?NativeCalls?{
????public?void?createNewWebView(int?tag);
????public?void?removeWebView(int?tag);
????public?void?moveWebView(int?tag,?int?x,?int?y);
????public?void?resizeWebView(int?tag,?int?w,?int?h);
????public?void?attachWebViewToMainLayout(int?tag);
????public?void?loadUrlAtWebView(int?tag,?String?url);
????public?void?loadHtmlAtWebView(int?tag,?String?html);?
}

然后再添加一個類,用來繼承webview,定制一些功能,比如開啟js和彈窗等,并且添加JavaScript交互接口，接口函數(shù)在C++中定義,在JAVA中聲明、

package?org.qtproject.qt5.android.bindings;
import?android.webkit.WebView;
import?android.webkit.WebViewClient;
import?android.widget.FrameLayout;
import?android.webkit.*;
import?android.content.Context;
import?android.util.Log;

public?class?Cjavascript??{

????public?Cjavascript??(?)?{


????}

????public??native?int??testcall2();
????public??native?void??testcall3();
????public??native?void??testcall4();
????public??void?testcall()
????{
????????Log.i("testcalltestcalltestcalltestcall",?"call:");
????}
}

package?org.qtproject.qt5.android.bindings;

import?android.annotation.SuppressLint;
import?android.content.Context;
import?android.graphics.Color;
import?android.webkit.JsResult;
import?android.webkit.WebChromeClient;
import?android.webkit.WebView;
import?android.webkit.WebViewClient;


public?class?MyWebView?extends?WebView?{

????public?MyWebView(Context?context)?{

????????super(context);?
????????init();

????????//?TODO?自動生成的構造函數(shù)存根
????}



????@SuppressLint("SetJavaScriptEnabled")
????public?void??init()?{
????????this.getSettings().setJavaScriptEnabled(true);
????????this.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
????????????//否則不會執(zhí)行js的Alert
????????this.setWebChromeClient(new?WebChromeClient()
????????????{???public?boolean?onJsAlert(WebView?view,?String?url,?String?message,
????????????????????????JsResult?result)
????????????????{
????????????????????//Auto-generated?method?stub
????????????????????return?super.onJsAlert(view,?url,?message,?result);
????????????????}

????????????});
????????this.setWebViewClient(new?WebViewClient());
????????this.setBackgroundColor(Color.BLACK);?

????????this.addJavascriptInterface(new?Cjavascript(),?"obj");
????}
}

最后就是修改Qt自己生成的QtActivity類，在作用域中添加以下代碼即可:
下面的代碼大部分參考別人的,少量修改。官方源碼中都是使用RunOnUiThread,下面的是用handle進行多線程界面操作。

?//-------------WEBVIEW----------------
????protected?ArrayListwebViewsList?=?new?ArrayList();

????//-----------------------------------------------------------------------------
????protected?MyWebView?findWebViewByTag(int?tag)?{
????????MyWebView?webViewRes?=?null;
????????for?(int?i?=?0;?i?<?webViewsList.size();?i++)?{
????????????MyWebView?wv?=?(MyWebView)?webViewsList.get(i);
????????????if?(((Integer)wv.getTag()).intValue()?==?tag)?{
????????????????webViewRes?=?wv;
????????????????break;
????????????}
????????}

????????return?webViewRes;
????}

????//-----------------------------------------------------------------------------
????@Override
????public?void?createNewWebView(int?tag)?{
????????Message?msg?=?new?Message();
????????msg.what?=?tag;

????????createNewWebViewHandler.sendMessage(msg);
????}

????protected?Handler?createNewWebViewHandler?=?new?Handler()?{
????????@SuppressLint("SetJavaScriptEnabled")
????????@Override
????????public?void?handleMessage(Message?msg)?{
????????????MyWebView?webView?=?new?MyWebView(QtActivity.this);

????????????webView.setTag(msg.what);
//??????????????webView.getSettings().setJavaScriptEnabled(true);
//??????????????webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
//??????????????//否則不會執(zhí)行js的Alert
//??????????????webView.setWebChromeClient(new?WebChromeClient()
//??????????????{???public?boolean?onJsAlert(WebView?view,?String?url,?String?message,
//??????????????????????????JsResult?result)
//??????????????????{
//??????????????????????//Auto-generated?method?stub
//??????????????????????return?super.onJsAlert(view,?url,?message,?result);
//??????????????????}
//
//??????????????});
//??????????????webView.setWebViewClient(new?WebViewClient());
//??????????????webView.setBackgroundColor(Color.BLACK);?

????????????webViewsList.add(webView);?

????????}
????};

????//-----------------------------------------------------------------------------
????@Override
????public?void?removeWebView(int?tag)?{
????????Message?msg?=?new?Message();
????????msg.what?=?tag;

????????removeWebViewHandler.sendMessage(msg);
????}

????protected?Handler?removeWebViewHandler?=?new?Handler()?{
????????@Override
????????public?void?handleMessage(Message?msg)?{
????????????MyWebView?webView?=?findWebViewByTag(msg.what);
????????????if?(webView?!=?null)?{
????????????????webViewsList.remove(webView);
????????????????FrameLayout?mainLayout?=?(FrameLayout)?findViewById(R.id.content);
????????????????mainLayout.removeView(webView);
????????????}
????????}
????};

????//-----------------------------------------------------------------------------
????@Override
????public?void?moveWebView(int?tag,?int?x,?int?y)?{
????????Message?msg?=?new?Message();
????????msg.what?=?tag;
????????msg.arg1?=?x;
????????msg.arg2?=?y;

????????moveWebViewHandler.sendMessage(msg);
????}


????protected?Handler?moveWebViewHandler?=?new?Handler()?{
????????@Override
????????public?void?handleMessage(Message?msg)?{
????????????View?viewToMove?=?null;
????????????viewToMove?=?findWebViewByTag(msg.what);

????????????if?(viewToMove?!=?null)?{
????????????????FrameLayout.LayoutParams?params?=?(android.widget.FrameLayout.LayoutParams)?viewToMove
????????????????????????.getLayoutParams();
????????????????params.leftMargin?=?msg.arg1;
????????????????params.topMargin?=?msg.arg2;
????????????????viewToMove.setLayoutParams(params);
????????????}
????????}
????};

????//-----------------------------------------------------------------------------
????@Override
????public?void?resizeWebView(int?tag,?int?w,?int?h)?{
????????Message?msg?=?new?Message();
????????msg.what?=?tag;
????????msg.arg1?=?w;
????????msg.arg2?=?h;

????????resizeWebViewHandler.sendMessage(msg);
????}


????protected?Handler?resizeWebViewHandler?=?new?Handler()?{
????????@Override
????????public?void?handleMessage(Message?msg)?{
????????????View?viewToResize?=?null;
????????????viewToResize?=?findWebViewByTag(msg.what);

????????????if?(viewToResize?!=?null)?{
????????????????FrameLayout.LayoutParams?params?=?(android.widget.FrameLayout.LayoutParams)?viewToResize
????????????????????????.getLayoutParams();
????????????????params.width?=?msg.arg1;
????????????????params.height?=?msg.arg2;
????????????????viewToResize.setLayoutParams(params);
????????????}
????????}
????};

????//-----------------------------------------------------------------------------
????@Override
????public?void?attachWebViewToMainLayout(int?tag)?{
????????Message?msg?=?new?Message();
????????msg.what?=?tag;

????????attachWebViewToMainLayoutHandler.sendMessage(msg);
????}

????protected?Handler?attachWebViewToMainLayoutHandler?=?new?Handler()?{
????????@Override
????????public?void?handleMessage(Message?msg)?{
????????????View?viewToAttach?=?null;
????????????viewToAttach?=?findWebViewByTag(msg.what);

????????????if?(viewToAttach?!=?null)?{
????????????????FrameLayout?mainLayout?=?(FrameLayout)?findViewById(R.id.content);
????????????????FrameLayout.LayoutParams?params?=?new?FrameLayout.LayoutParams(100,?100);
????????????????params.leftMargin?=?0;
????????????????params.topMargin?=?0;

????????????????mainLayout.addView(viewToAttach,?params);
????????????}
????????}
????};

????//-----------------------------------------------------------------------------
????@Override
????public?void?loadUrlAtWebView(int?tag,?String?url)?{
????????Log.i("url",?"curid:"+Thread.currentThread().getId());
????????Message?msg?=?new?Message();
????????msg.what?=?tag;
????????msg.obj?=?url;


?????????loadUrlAtWebViewHandler.sendMessage(msg);
????}

????protected?Handler?loadUrlAtWebViewHandler?=?new?Handler()?{
????????@Override
????????public?void?handleMessage(Message?msg)?{
????????????Log.i("url",?"mainid:"+Thread.currentThread().getId());
????????????MyWebView?webView?=?findWebViewByTag(msg.what);
????????????if?(webView?!=?null)?{
????????????????webView.loadUrl(msg.obj.toString());
????????????????Log.i("url",?msg.obj.toString());
????????????}
????????????//Log.i("TestNative*********",?"call:");
????????????//TestNative??testNative??=?new?TestNative();
????????????//testNative.Test();
????????}
????};

????//-----------------------------------------------------------------------------

????@Override
????public?void?loadHtmlAtWebView(int?tag,?String?html)?{
????????Message?msg?=?new?Message();
????????msg.what?=?tag;
????????msg.obj?=?html;

????????loadHtmlAtWebViewHandler.sendMessage(msg);
????}

????protected?Handler?loadHtmlAtWebViewHandler?=?new?Handler()?{
????????@Override
????????public?void?handleMessage(Message?msg)?{
????????????MyWebView?webView?=?findWebViewByTag(msg.what);
????????????if?(webView?!=?null)?{
????????????????webView.loadData(msg.obj.toString(),?"text/html;?charset=UTF-8",?"UTF-8");

????????????}
????????}
????};

C++層,注冊JavaScript函數(shù):

#ifndef?JAVA_JAVASCTRIPTFUNC_H
#define?JAVA_JAVASCTRIPTFUNC_H
#include#include#includeclass?JAVA_javasctriptFunc
{
public:
????JAVA_javasctriptFunc();
????bool?regfuc();
};

#endif?//?JAVA_JAVASCTRIPTFUNC_H

#include?"java_javasctriptfunc.h"
int?cout=0;
static?jint?testcall2(JNIEnv?*env,?jobject?thiz)
{
????cout++;
???qInfo()?<<?"MY?C+++:?testcall2"<<QThread::currentThreadId()?;

???return?cout;
???????//?QMessageBox::information(NULL,"HEHE","33");
}
static?void?testcall3(JNIEnv?*env,?jobject?thiz)
{
???qInfo()?<<?"MY?C+++:?testcall3"<<QThread::currentThreadId()??;
???????//?QMessageBox::information(NULL,"HEHE","33");
}
static?void?testcall4(JNIEnv?*env,?jobject?thiz)
{
???qInfo()?<<?"MY?C+++:?testcall4"<GetObjectClass(javaClass.object());
?????qDebug()?<<?"find?ExtendsQtNative?-?"?<<?clazz;
?????bool?result?=?false;
?????if(clazz)
?????{
?????????jint?ret?=?env->RegisterNatives(clazz,
?????????????????????????????????????????methods,
?????????????????????????????????????????sizeof(methods)?/?sizeof(methods[0]));
?????????env->DeleteLocalRef(clazz);
?????????qDebug()?<<?"RegisterNatives?return?-?"?<<?ret;
?????????result?=?ret?>=?0;
?????}
?????if(env->ExceptionCheck())?env->ExceptionClear();
?????return?result;
?}

WEBVIEW的C++層實現(xiàn):

#pragma?once

#include#include#includeclass?CAndroidNativeCallsSender
{
public:
????CAndroidNativeCallsSender();
????~CAndroidNativeCallsSender();

????void?createNewWebView(?int?id?)?const;
????void?removeWebView(?int?id?)?const;
????void?attachWebViewToMainLayout(?int?id?)?const;
????void?moveWebView(?int?id,?int?x,?int?y?)?const;
????void?resizeWebView(?int?id,?int?w,?int?h?)?const;
????void?loadUrlAtWebView(?int?id,?QString?const&?url?)?const;
????void?loadHtmlAtWebView(?int?id,?QString?const&?html?)?const;

protected:
????jmethodID?m_createNewWebViewMID;
????jmethodID?m_removeWebViewMID;
????jmethodID?m_attachWebViewToMainLayoutMID;
????jmethodID?m_moveWebViewMID;
????jmethodID?m_resizeWebViewMID;
????jmethodID?m_loadUrlAtWebViewMID;
????jmethodID?m_loadHtmlAtWebViewMID;

????jobject?m_objectRef;
};

#include?"AndroidNativeCallsSender.h"
#include//-----------------------------------------------------------------------------
CAndroidNativeCallsSender::CAndroidNativeCallsSender()
{
????QAndroidJniEnvironment?jniEnv;
????QAndroidJniObject?qObjAct?=?QAndroidJniObject::callStaticObjectMethod(?"org/qtproject/qt5/android/QtNative",
???????????????????????????????????????????????????????????????????????????"activity",
???????????????????????????????????????????????????????????????????????????"()Landroid/app/Activity;"?);
????jobject?objAct?=?qObjAct.object();
????m_objectRef?=?jniEnv->NewGlobalRef(?objAct?);
????jclass?cls?=?jniEnv->GetObjectClass(?objAct?);

????if(?cls?)
????{
????????m_createNewWebViewMID?=?jniEnv->GetMethodID(?cls,?"createNewWebView",?"(I)V"?);
????????m_removeWebViewMID?=?jniEnv->GetMethodID(?cls,?"removeWebView",?"(I)V"?);
????????m_attachWebViewToMainLayoutMID?=?jniEnv->GetMethodID(?cls,?"attachWebViewToMainLayout",?"(I)V"?);
????????m_moveWebViewMID?=?jniEnv->GetMethodID(?cls,?"moveWebView",?"(III)V"?);
????????m_resizeWebViewMID?=?jniEnv->GetMethodID(?cls,?"resizeWebView",?"(III)V"?);
????????m_loadUrlAtWebViewMID?=?jniEnv->GetMethodID(?cls,?"loadUrlAtWebView",?"(ILjava/lang/String;)V"?);
????????m_loadHtmlAtWebViewMID?=?jniEnv->GetMethodID(?cls,?"loadHtmlAtWebView",?"(ILjava/lang/String;)V"?);
????}
}

//-----------------------------------------------------------------------------
CAndroidNativeCallsSender::~CAndroidNativeCallsSender()
{
????if(?m_objectRef?!=?NULL?)
????{
????????QAndroidJniEnvironment?jniEnv;
????????jniEnv->DeleteGlobalRef(?m_objectRef?);
????}
}

//-----------------------------------------------------------------------------
void?CAndroidNativeCallsSender::createNewWebView(?int?id?)?const
{
????if(?m_createNewWebViewMID?)
????{
????????QAndroidJniEnvironment?jniEnv;
????????jniEnv->CallVoidMethod(?m_objectRef,?m_createNewWebViewMID,?id?);
????}
}

//-----------------------------------------------------------------------------
void?CAndroidNativeCallsSender::removeWebView(?int?id?)?const
{
????if(?m_removeWebViewMID?)
????{
????????QAndroidJniEnvironment?jniEnv;
????????jniEnv->CallVoidMethod(?m_objectRef,?m_removeWebViewMID,?id?);
????}
}

//-----------------------------------------------------------------------------
void?CAndroidNativeCallsSender::attachWebViewToMainLayout(?int?id?)?const
{
????if(?m_attachWebViewToMainLayoutMID?)
????{
????????QAndroidJniEnvironment?jniEnv;

????????jniEnv->CallVoidMethod(?m_objectRef,?m_attachWebViewToMainLayoutMID,?id?);
????}
}

//-----------------------------------------------------------------------------
void?CAndroidNativeCallsSender::moveWebView(?int?id,?int?x,?int?y?)?const
{
????if(?m_moveWebViewMID?)
????{
????????QAndroidJniEnvironment?jniEnv;
????????jniEnv->CallVoidMethod(?m_objectRef,?m_moveWebViewMID,?id,?x,?y?);
????}
}

//-----------------------------------------------------------------------------
void?CAndroidNativeCallsSender::resizeWebView(?int?id,?int?w,?int?h?)?const
{
????if(?m_resizeWebViewMID?)
????{
????????QAndroidJniEnvironment?jniEnv;

????????jniEnv->CallVoidMethod(?m_objectRef,?m_resizeWebViewMID,?id,?w,?h?);
????}
}

//-----------------------------------------------------------------------------
void?CAndroidNativeCallsSender::loadUrlAtWebView(?int?id,?QString?const&?url?)?const
{
????if(?m_loadUrlAtWebViewMID?)
????{
????????QAndroidJniEnvironment?jniEnv;
????????jstring?jurl?=?jniEnv->NewStringUTF(?url.toUtf8().constData()?);
????????jniEnv->CallVoidMethod(?m_objectRef,
????????????????????????????????m_loadUrlAtWebViewMID,
????????????????????????????????id,
????????????????????????????????jurl?);
????????jniEnv->DeleteLocalRef(?jurl?);
????}
}

//-----------------------------------------------------------------------------
void?CAndroidNativeCallsSender::loadHtmlAtWebView(?int?id,?QString?const&?html?)?const
{
????if(?m_loadUrlAtWebViewMID?)
????{
????????QAndroidJniEnvironment?jniEnv;
????????jstring?jhtml?=?jniEnv->NewStringUTF(?html.toUtf8().constData()?);
????????jniEnv->CallVoidMethod(?m_objectRef,
????????????????????????????????m_loadHtmlAtWebViewMID,
????????????????????????????????id,
????????????????????????????????jhtml?);
????????jniEnv->DeleteLocalRef(?jhtml?);
????}
}

#pragma?once

#include#include#include?"AndroidNativeCallsSender.h"

class?QtCustomAndroidWebView?:?public?QWidget
{
????Q_OBJECT
public:
????explicit?QtCustomAndroidWebView(?QWidget?*parent?=?0?);
????~QtCustomAndroidWebView();

????void?loadURL(?QString?const&?url?)?const;
????void?loadHtmlData(?QString?const&?data?)?const;

????void?move(?int?x,?int?y?);
????void?move(?QPoint?const&?p?);
????void?resize(?int?w,?int?h?);

????int?androidID()?const?{?return?m_androidID;?}

protected:
????static?int?sm_tag;
????int?m_androidID;
????CAndroidNativeCallsSender?m_nativeSender;

????int?generateNewTag();

signals:

public?slots:
};

#include?"QtCustomAndroidWebView.h"

//#include//-----------------------------------------------------------------------------
int?QtCustomAndroidWebView::sm_tag?=?0;

//-----------------------------------------------------------------------------
QtCustomAndroidWebView::QtCustomAndroidWebView(?QWidget?*parent?)
????:?QWidget(?parent?)
????,?m_androidID(?generateNewTag()?)
{
//????if(?parent?&&?parent->layout()?)
//????????parent->layout()->addWidget(?this?);

????m_nativeSender.createNewWebView(?androidID()?);
????m_nativeSender.attachWebViewToMainLayout(?androidID()?);
}

//-----------------------------------------------------------------------------
QtCustomAndroidWebView::~QtCustomAndroidWebView()
{
????m_nativeSender.removeWebView(?androidID()?);
}

//-----------------------------------------------------------------------------
void?QtCustomAndroidWebView::loadURL(?QString?const&?url?)?const
{
????m_nativeSender.loadUrlAtWebView(?androidID(),?url?);
}

//-----------------------------------------------------------------------------
void?QtCustomAndroidWebView::loadHtmlData(?QString?const&?data?)?const
{
????m_nativeSender.loadHtmlAtWebView(?androidID(),?data?);
}

//-----------------------------------------------------------------------------
void?QtCustomAndroidWebView::move(?int?x,?int?y?)
{
????QWidget::move(?x,?y?);
????m_nativeSender.moveWebView(?androidID(),?x,?y?);
}

//-----------------------------------------------------------------------------
void?QtCustomAndroidWebView::move(?QPoint?const&?p?)
{
????QtCustomAndroidWebView::move(?p.x(),?p.y()?);
}

//-----------------------------------------------------------------------------
void?QtCustomAndroidWebView::resize(?int?w,?int?h?)
{
????QWidget::resize(?w,?h?);
????m_nativeSender.resizeWebView(?androidID(),?w,?h?);
}

//-----------------------------------------------------------------------------
int?QtCustomAndroidWebView::generateNewTag()
{
????sm_tag++;
????return?sm_tag;
}

測試代碼

#include?"mytest.h"
#include?"QtCustomAndroidWebView.h"
#include#include#include#includeMyTest::MyTest(QWidget?*parent)?:?QWidget(parent)
{
????vbox?=?new?QVBoxLayout(this);

????btn?=?new?QPushButton("call");
????btn->setText("CALL");
????edit?=?new?QTextEdit();
??????vbox->addWidget(btn);
??????vbox->addWidget(edit);

//????webview?=?new?QtCustomAndroidWebView();

//????webview->resize(this->width(),this->height());
//???webview->move(0,0);
//???webview->loadURL("http://www.baidu.com");
//???vbox->addWidget(webview);

?QScreen?*screen?=?QApplication::primaryScreen();

???webview?=?new?QtCustomAndroidWebView(?);

?????webview->resize(this->width(),?200);
?????webview->loadURL("file:///android_asset/index.html");

????//注冊js函數(shù)
?????javajavasctriptFunc?=?new?JAVA_javasctriptFunc();
?????if(javajavasctriptFunc->regfuc()==false)
?????{
????????????????qDebug()<addWidget(webview);

??????connect(btn,SIGNAL(clicked(bool)),this,SLOT(onclick()));
}


?void??MyTest::onclick()
?{
?????int?cout=0;
?????while?(1)?{
?????????QThread::msleep(200);
?????????QString?s;
?????????s.sprintf("javascript:test2(%d)",cout);
?????????cout++;
?????????webview->loadURL(s);
//??????執(zhí)行js腳本?返回值可參考Qt?android?src中WebView的實現(xiàn)?????webview->loadURL("javascript:test()");
?????}

?}

$(function(){

????$("button").click(function(){
????var??x=obj.testcall2();

?????????$("#list1").append("Inbox"+x+"");
????????$('#list1').listview("refresh");

??});


});

如何調(diào)用JavaScript能獲取返回值,可參考Qt的源碼，其實沒啥必要,只需要注冊一個函數(shù)給js調(diào)用,讓他把返回值弄進來就是

?m_webSettingsSetDisplayZoomControls?=?webSettings.getClass().getMethod("setDisplayZoomControls",?boolean.class);
????????????????????????if?(Build.VERSION.SDK_INT?>?18)?{
????????????????????????????m_webViewEvaluateJavascript?=?m_webView.getClass().getMethod("evaluateJavascript",
?????????????????????????????????????????????????????????????????????????????????????????String.class,
?????????????????????????????????????????????????????????????????????????????????????????ValueCallback.class);
????????????????????????}

????public?void?runJavaScript(final?String?script,?final?long?callbackId)
????{
????????if?(script?==?null)
????????????return;

????????if?(Build.VERSION.SDK_INT?<?19?||?m_webViewEvaluateJavascript?==?null)
????????????return;

????????m_activity.runOnUiThread(new?Runnable()?{
????????????@Override
????????????public?void?run()?{
????????????????try?{
????????????????????m_webViewEvaluateJavascript.invoke(m_webView,?script,?callbackId?==?-1???null?:
????????????????????????new?ValueCallback()?{
????????????????????????????@Override
????????????????????????????public?void?onReceiveValue(String?result)?{
????????????????????????????????c_onRunJavaScriptResult(m_id,?callbackId,?result);
????????????????????????????}
????????????????????????});
????????????????}?catch?(Exception?e)?{
????????????????????e.printStackTrace();
????????????????}
????????????}
????????});
????}