package com.eoeandorid.reader;
import java.io.IOException;
import android.content.Context;
import android.graphics.Bitmap;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings.LayoutAlgorithm;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.LinearLayout;
import android.widget.TextView;
public class EpubWebView extends WebView {
private String epubHtmlFileUrl = "";
private String basedir = "";
private EpubReaderActivity activity;
private int scrollWidth = 0;
private int totalPage = 0;
private float anchorPosition = 0;
private boolean isLoadComplete = false;
private int curPosition = 0;
private TextView mTextView = null;
//private InputStream mInputStream = null;
public EpubWebView(Context context) {
super(context);
}
public EpubWebView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public EpubWebView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
private byte lock_loadUrl[] = new byte[1];
public void setAct(EpubReaderActivity activity){
this.activity = activity;
}
public void execJavaScript (String js) {
super.loadUrl("javascript:"+js);
}
public int getTotalPage(){
return this.totalPage;
}
public float getAnchorPostion(){
return this.anchorPosition;
}
public boolean isComplete(){
return this.isLoadComplete;
}
public void setCurWebViewPosition(int position){
this.curPosition = position;
}
@Override
public void loadUrl(String url) {
int widthDip = UIHelper.getScreenWidthDip(activity);
int heightDip = UIHelper.getScreenHeightDip(activity);
String css = EpubJavaScript.getWebCss(widthDip,heightDip,10,activity);
if(!this.epubHtmlFileUrl.equals(url)){
this.epubHtmlFileUrl = url;
}
synchronized (lock_loadUrl) {
freeMemory();
String file=this.epubHtmlFileUrl.replace("file:///", "");
this.basedir = this.epubHtmlFileUrl.substring(0,this.epubHtmlFileUrl.lastIndexOf("/")+1);
String html = "";
String data = "";
try {
byte [] bHtmlData = FileUtil.readFileByBytes(file);
html = new String(bHtmlData,"UTF-8");
int pos = html.indexOf("</head>");
if (pos != -1 ){
data = html.substring(0, pos)+"\n<meta name=\"viewport\" content=\"width=device-width; initial-scale=1.0; minimum-scale=1.0; maximum-scale=1.0\"/>\n<style type='text/css'> \n<!--\n"
+ css +"\n-->\n </style>\n" + html.substring(pos,html.length()) ;
}else {
pos = html.indexOf("<body");
if(pos != -1){
data = "<head>"+html.substring(0, pos)+"\n<meta name=\"viewport\" content=\"width=device-width; initial-scale=1.0; minimum-scale=1.0; maximum-scale=1.0\"/>\n<style type='text/css'> \n<!--\n"
+ css +"\n-->\n </style>\n" +"</head>\n" + html.substring(pos,html.length()) ;
}else{
data = html;
}
}
super.loadDataWithBaseURL(this.basedir, data, "text/html", "UTF-8", null);
setEpubProperties();
} catch (IOException e) {
e.printStackTrace();
}
}
}
//set setting of webview
private void setEpubProperties(){
//unable scroll bar
this.setHorizontalScrollBarEnabled(false);
//enable JavaScript
this.getSettings().setJavaScriptEnabled(true);
//add new interface that contract with Javascript
this.addJavascriptInterface(new JavaScriptInterface(), "Android");
//set setWebChromeClient object and get onProgressChanged and onConsoleMessage methonds
this.setWebChromeClient(new EpubWebChromeClient());
//set WebviewClient object and get onPageFinished methond
this.setWebViewClient(new EpubWebviewClient());
//make the webview can't scroll
this.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return true;
}
});
}
private class EpubWebChromeClient extends WebChromeClient{
@Override
public void onProgressChanged(WebView view, int newProgress) {
super.onProgressChanged(view, newProgress);
if(mTextView != null){
mTextView.setText(newProgress+"%");
if(newProgress == 100){
mTextView.setText("99%");
}
}
}
@Override
public void onConsoleMessage(String message, int lineNumber,
String sourceID) {
super.onConsoleMessage(message, lineNumber, sourceID);
}
}
//calling after webview object finish loading html
private class EpubWebviewClient extends WebViewClient{
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
setProcessBar();
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
//through Javascript to get the scollWidth of webview
String js = " var scrollWidth = document.documentElement.scrollWidth;" +
" Android.setScrollWidthInterface(scrollWidth);" +
//可以用来记忆当前的位置，直接使用scrollTo设置到某x轴
" window.scrollTo("+EpubWebView.this.curPosition+",0);" +
" Android.setCompleteInterface();";
execJavaScript(js);
}
}
//set process bar
private void setProcessBar(){
mTextView = new TextView(activity);
mTextView.setTextSize(50);
mTextView.setGravity(Gravity.CENTER);
EpubWebView.this.addView(mTextView,new LinearLayout.LayoutParams( UIHelper.getScreenWidth(activity),
UIHelper.getScreenHeight(activity)));
}
//set the value of scrollWidth
private class JavaScriptInterface{
public void setScrollWidthInterface(int scrollWidth){
EpubWebView.this.scrollWidth = scrollWidth;
EpubWebView.this.totalPage = (int)Math.ceil(((double)scrollWidth)/UIHelper.getScreenWidthDip(activity));
}
public void setCompleteInterface(){
EpubWebView.this.isLoadComplete = true;
//make progress bar disappear
if(mTextView != null){
EpubWebView.this.post(new Runnable() {
@Override
public void run() {
removeView(mTextView);
}
});
}
}
}
}