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JsObject.java
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JsObject.java
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package com.stackdeveloper.lib;
import android.annotation.SuppressLint;
import android.content.Context;
import android.webkit.JavascriptInterface;
import android.webkit.WebView;
import android.widget.Toast;
public class JsObject
{
private Context mContext;
private WebView mWebView;
private byte[] mDecodedImage;
private HandlerImageDataResult mImageDataResultHandler;
private HandlerWebViewHtmlContent mWebViewHtmlContentHandler;
public JsObject(Context context)
{
mContext = context;
mWebView = new WebView(mContext);
registerObject();
}
public JsObject(Context context,WebView webView)
{
mContext = context;
mWebView = webView;
registerObject();
}
@SuppressLint("SetJavaScriptEnabled")
public void registerObject()
{
mWebView.getSettings().setDomStorageEnabled(true);
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.getSettings().setLoadsImagesAutomatically(true);
mWebView.addJavascriptInterface(this, "jsObject");
}
public WebView getWebView()
{
return mWebView;
}
/**
* alone can not be called!
* @param base64Image
*/
@JavascriptInterface
public void getBase64ImageString(String base64Image)
{
String cleanBase64Image = base64Image.replace("data:image/png;base64,", "");
try
{
mDecodedImage = android.util.Base64.decode(cleanBase64Image, android.util.Base64.DEFAULT);
if (mDecodedImage.length == 0) return;
if (mDecodedImage != null) mImageDataResultHandler.onConvertComplete(mDecodedImage);
} catch (Exception e)
{
Toast.makeText(mContext, "Byte Conversion Error ! \n"+e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
public void addImageDataResultHandler(HandlerImageDataResult handler)
{
mImageDataResultHandler = handler;
}
/**
* alone can not be called!
* @param html
*/
@JavascriptInterface
public void onGetHtmlContent(String html)
{
if (mWebViewHtmlContentHandler != null)
mWebViewHtmlContentHandler.onGetHtmlContent(html);
}
public void jsGetHtmlContent(HandlerWebViewHtmlContent handler)
{
mWebViewHtmlContentHandler = handler;
jsExecute("jsObject.onGetHtmlContent(document.documentElement.innerHTML);");
}
public String jsElementsByAttributeName()
{
StringBuilder sb = new StringBuilder();
sb.append("function getElementsByAttributeName(tagName, attributeName, attributeValue) { ");
sb.append(" var i, n, objs=[], els=document.getElementsByTagName(tagName), len=els.length;");
sb.append(" for (i=0; i<len; i++) { ");
sb.append(" n = els[i][attributeName]; ");
sb.append(" if (n && (n==attributeValue)) { ");
sb.append(" objs.push(els[i]);");
sb.append(" }");
sb.append(" }");
sb.append(" return objs;");
sb.append("}");
return sb.toString();
}
public String jsElementsByName(String elementName,String elementValue)
{
StringBuilder sb = new StringBuilder();
sb.append("document.getElementsByName('"+elementName+"')[0].value ='" + elementValue + "';");
return sb.toString();
}
public String jsAlert(String message)
{
StringBuilder sb = new StringBuilder();
sb.append("alert('"+message+"');");
return sb.toString();
}
public String jsSumbitFormByName(String name)
{
StringBuilder sb = new StringBuilder();
sb.append("document.forms['"+name+"'].submit();");
return sb.toString();
}
public String jsDrawImage()
{
StringBuilder sb = new StringBuilder();
sb.append(JsToDataUrl.buidScript());
sb.append("var canvas = document.createElement(\"canvas\");");
sb.append("document.body.appendChild(canvas);");
sb.append("canvas.width = img.width;");
sb.append("canvas.height = img.height;");
sb.append("var ctx = canvas.getContext(\"2d\");");
sb.append("ctx.drawImage(img,0,0,img.clientWidth,img.clientHeight);");
sb.append("var dataURL = canvas.toDataURL();");
sb.append("jsObject.getBase64ImageString(dataURL.toString());");
return sb.toString();
}
public void getCaptchaImageFromImgAttributeSrc(String src,HandlerImageDataResult handler)
{
mImageDataResultHandler = handler;
StringBuilder sb = new StringBuilder();
sb.append(jsElementsByAttributeName().toString());
sb.append("var img = getElementsByAttributeName('img', 'src', '"+src+"')[0];");
sb.append(jsDrawImage());
jsExecute(sb.toString());
}
public void getCaptchaImageFromImgAttributeAlt(String alt,HandlerImageDataResult handler)
{
mImageDataResultHandler = handler;
StringBuilder sb = new StringBuilder();
sb.append(jsElementsByAttributeName().toString());
sb.append("var img = getElementsByAttributeName('img', 'alt', '"+alt+"')[0];");
sb.append(jsDrawImage());
jsExecute(sb.toString());
}
public void getCaptchaImageFromImgAttributeId(String id,HandlerImageDataResult handler)
{
mImageDataResultHandler = handler;
StringBuilder sb = new StringBuilder();
sb.append(jsElementsByAttributeName().toString());
sb.append("var img = document.getElementById('"+id+"');");
sb.append(jsDrawImage());
jsExecute(sb.toString());
}
public void jsExecute(String javaScript)
{
StringBuilder sb = new StringBuilder();
sb.append("javascript:");
sb.append("{ ");
sb.append(javaScript);
sb.append("}");
mWebView.loadUrl(sb.toString());
}
}