我正在尝试从浏览器捕获HTML代码响应。我创建了一个浏览器并试图捕获HTML内容并在logcat中打印。 我在logcat中收到以下错误消息：
01-28 13：36：18.914 4079-4079 / com.aseelarbazanny.myweb D / PocketMagic：onPageFinished 01-28 13：36：18.954 4079-4079 / com.aseelarbazanny.myweb I / chromium：[INFO：CONSOLE（1）]＆＃34; Uncaught TypeError：Object [object Object]没有方法＆＃39; showHTML＆＃ 39;＆＃34;，来源：http://www.pocketmagic.net/（1）
这是我到目前为止所做的代码：
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.Typeface;
import android.net.http.SslError;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.view.Window;
import android.webkit.SslErrorHandler;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class AndroidBrowserGUI extends Activity implements View.OnClickListener {
// constants
final static String LOG_TAG = "PocketMagic";
final static int idTopLayout = Menu.FIRST + 100,
idBack = Menu.FIRST + 101,
idBotLayout = Menu.FIRST + 102,
idAddr = Menu.FIRST + 103,
idButBack = Menu.FIRST + 104,
idButFwd = Menu.FIRST + 105,
idButReload = Menu.FIRST + 106,
idButStop = Menu.FIRST + 107,
idButGo = Menu.FIRST + 108;
// interface controls
String m_szPage = "http://www.pocketmagic.net";
int m_nHTMLSize = 0;
WebView m_web;
EditText m_etAddr;
TextView m_tv;
Button m_bButBack, m_bButFwd, m_bButReload, m_bButStop, m_bButGo;
@Override
@SuppressLint("JavascriptInterface")
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Hide titlebar
requestWindowFeature(Window.FEATURE_NO_TITLE);
//Create our top content holder
RelativeLayout global_panel = new RelativeLayout (this);
global_panel.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.FILL_PARENT));
global_panel.setGravity(Gravity.FILL);
global_panel.setBackgroundDrawable(getResources().getDrawable( R.drawable.back));
// +++++++++++++ TOP COMPONENT: the header
RelativeLayout ibMenu = new RelativeLayout(this);
ibMenu.setId(idTopLayout);
ibMenu.setBackgroundDrawable(getResources().getDrawable(R.drawable.line));
int ibMenuPadding = (int) 6;
ibMenu.setPadding(ibMenuPadding,ibMenuPadding,ibMenuPadding,ibMenuPadding);
RelativeLayout.LayoutParams topParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
topParams.addRule(RelativeLayout.ALIGN_PARENT_TOP);
global_panel.addView(ibMenu,topParams);
//
int nTextH = 12;
// go button
m_bButGo = new Button(this);
m_bButGo.setId(idButGo);
m_bButGo.setOnClickListener((View.OnClickListener) this);
m_bButGo.setText("Go");
m_bButGo.setTextSize(nTextH);
m_bButGo.setTypeface(Typeface.create("arial", Typeface.BOLD));
RelativeLayout.LayoutParams lpb5 =
new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
lpb5.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
lpb5.addRule(RelativeLayout.ALIGN_PARENT_TOP);
ibMenu.addView(m_bButGo, lpb5);
// address field
m_etAddr = new EditText(this);
m_etAddr.setId(idAddr);
m_etAddr.setText(m_szPage);
nTextH = 12;
m_etAddr.setTextSize(nTextH);
m_etAddr.setTypeface(Typeface.create("arial", Typeface.NORMAL));
RelativeLayout.LayoutParams lpbEdit =
new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
lpbEdit.addRule(RelativeLayout.RIGHT_OF, idButGo);
lpbEdit.addRule(RelativeLayout.ALIGN_PARENT_TOP);
ibMenu.addView(m_etAddr, lpbEdit);
// +++++++++++++ BOTTOM COMPONENT: the footer
RelativeLayout ibMenuBot = new RelativeLayout(this);
ibMenuBot.setId(idBotLayout);
ibMenuBot.setBackgroundDrawable(getResources().getDrawable(R.drawable.line));
ibMenuBot.setPadding(ibMenuPadding,ibMenuPadding,ibMenuPadding,ibMenuPadding);
RelativeLayout.LayoutParams botParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
botParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
global_panel.addView(ibMenuBot,botParams);
m_bButBack = new Button(this);
m_bButBack.setId(idButBack);
m_bButBack.setOnClickListener((View.OnClickListener) this);
m_bButBack.setText("Back");
m_bButBack.setTextSize(nTextH);
m_bButBack.setTypeface(Typeface.create("arial", Typeface.BOLD));
RelativeLayout.LayoutParams lpb1 =
new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
lpb1.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
lpb1.addRule(RelativeLayout.ALIGN_PARENT_TOP);
ibMenuBot.addView(m_bButBack, lpb1);
// fwd button
m_bButFwd = new Button(this);
m_bButFwd.setId(idButFwd);
m_bButFwd.setOnClickListener((View.OnClickListener) this);
m_bButFwd.setText("Fwd");
m_bButFwd.setTextSize(nTextH);
m_bButFwd.setTypeface(Typeface.create("arial", Typeface.BOLD));
RelativeLayout.LayoutParams lpb2 =
new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
lpb2.addRule(RelativeLayout.RIGHT_OF, idButBack);
lpb2.addRule(RelativeLayout.ALIGN_PARENT_TOP);
ibMenuBot.addView(m_bButFwd, lpb2);
// reload button
m_bButReload = new Button(this);
m_bButReload.setId(idButReload);
m_bButReload.setOnClickListener((View.OnClickListener) this);
m_bButReload.setText("Rld");
m_bButReload.setTextSize(nTextH);
m_bButReload.setTypeface(Typeface.create("arial", Typeface.BOLD));
RelativeLayout.LayoutParams lpb3 =
new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
lpb3.addRule(RelativeLayout.RIGHT_OF, idButFwd);
lpb3.addRule(RelativeLayout.ALIGN_PARENT_TOP);
ibMenuBot.addView(m_bButReload, lpb3);
// stop button
m_bButStop = new Button(this);
m_bButStop.setId(idButStop);
m_bButStop.setOnClickListener((View.OnClickListener) this);
m_bButStop.setText("Stop");
m_bButStop.setTextSize(nTextH);
m_bButStop.setTypeface(Typeface.create("arial", Typeface.BOLD));
RelativeLayout.LayoutParams lpb4 =
new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
lpb4.addRule(RelativeLayout.RIGHT_OF, idButReload);
lpb4.addRule(RelativeLayout.ALIGN_PARENT_TOP);
ibMenuBot.addView(m_bButStop, lpb4);
// status
m_tv = new TextView(this);
m_tv.setText("Status");
m_tv.setTextColor(Color.rgb(255,255,255));
m_tv.setTextSize(nTextH);
m_tv.setTypeface(Typeface.create("arial", Typeface.BOLD));
RelativeLayout.LayoutParams lpcTV = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
lpcTV.addRule(RelativeLayout.RIGHT_OF, idButStop);
lpcTV.addRule(RelativeLayout.CENTER_VERTICAL);
ibMenuBot.addView(m_tv, lpcTV);
// +++++++++++++ MIDDLE COMPONENT: only a webview control
m_web = new WebView(this);
m_web.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.FILL_PARENT));
RelativeLayout.LayoutParams midParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.FILL_PARENT);
midParams.addRule(RelativeLayout.ABOVE,ibMenuBot.getId());
midParams.addRule(RelativeLayout.BELOW,ibMenu.getId());
global_panel.addView(m_web,midParams );
// Configure our webview object
m_web.getSettings().setJavaScriptEnabled(true);
m_web.setWebViewClient(new MyWebViewClient());
// set starting page
if (m_szPage != null) m_web.loadUrl(m_szPage);
// set java script used to get the HTML code
m_web.addJavascriptInterface(new JavaScriptInterface(), "HTMLOUT");
// Interface READY
setContentView(global_panel);
}
// Used with Webview, to get the HTML code
class JavaScriptInterface{
public void showHTML(String html) {
m_nHTMLSize = 0;
if (html !=null) {
//int i = html.lastIndexOf(""); //search for something in the text
m_nHTMLSize = html.length();
Log.d(LOG_TAG, "HTML content is: "+html+"\nSize:"+m_nHTMLSize+" bytes");
}
}
}
private class MyWebViewClient extends WebViewClient {
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
Log.d(LOG_TAG, "onPageStarted");
m_tv.setText("Loading page...");
//stop button is enabled only when pages are loading
m_bButStop.setEnabled(true);
}
@Override
public void onPageFinished(WebView view, String url) {
Log.d(LOG_TAG, "onPageFinished");
m_tv.setText("Ready");
//stop button is disabled when pages are already loaded
m_bButStop.setEnabled(false);
// This call inject JavaScript into the page which just finished loading.
m_web.loadUrl("javascript:window.HTMLOUT.showHTML('<head>'+document.getElementsByTagName('html')[0].innerHTML+'</head>');");
// adjust prev/next buttons, only if history is available
m_bButBack.setEnabled(m_web.canGoBack());
m_bButFwd.setEnabled(m_web.canGoForward());
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
public void onClick(View arg0) {
// TODO Auto-generated method stub
int id = arg0.getId();
// If cancel is pressed, close our app
if (id == idBack) finish();
if (id == idButGo) {
m_szPage = m_etAddr.getText().toString();
Log.d(LOG_TAG, "Go for page:"+m_szPage);
if (m_szPage != null) m_web.loadUrl(m_szPage);
}
if (id == idButBack) {
Log.d(LOG_TAG, "Go back");
m_web.goBack();
}
if (id == idButFwd) {
Log.d(LOG_TAG, "Go forward");
m_web.goForward();
}
if (id == idButReload) {
Log.d(LOG_TAG, "Reload page");
m_web.reload();
}
if (id == idButStop) {
Log.d(LOG_TAG, "Stop loading page");
m_web.stopLoading();
}
}
}
答案 0 :(得分：0)
从API级别JELLY_BEAN_MR1及更高版本开始，只有明确标有@JavascriptInterface注释的方法才可用于Javascript代码。
您只需在showHTML方法上方添加此项，例如：
class JavaScriptInterface{
@JavascriptInterface
public void showHTML(String html) {
m_nHTMLSize = 0;
if (html !=null) {
//int i = html.lastIndexOf(""); //search for something in the text
m_nHTMLSize = html.length();
Log.d(LOG_TAG, "HTML content is: "+html+"\nSize:"+m_nHTMLSize+" bytes");
}
}
}
还需要从你的JS调用中删除window：
m_web.loadUrl("javascript:window.HTMLOUT.showHTML('<head>'+document.getElementsByTagName('html')[0].innerHTML+'</head>');");
到
m_web.loadUrl("javascript:HTMLOUT.showHTML('<head>'+document.getElementsByTagName('html')[0].innerHTML+'</head>');");