Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
79 views
in Technique[技术] by (71.8m points)

android - how to get html content from a webview?

Which is the simplest method to get html code from a webview? I have tried several methods from stackoverflow and google, but can't find an exact method. Please mention an exact way.

public class htmldecoder extends Activity implements OnClickListener,TextWatcher
{
TextView txturl;
Button btgo;
WebView wvbrowser;
TextView txtcode;
ImageButton btcode;
LinearLayout llayout;
int flagbtcode;
public void onCreate(Bundle savedInstanceState)
{
            super.onCreate(savedInstanceState);
                setContentView(R.layout.htmldecoder);

    txturl=(TextView)findViewById(R.id.txturl);

    btgo=(Button)findViewById(R.id.btgo);
    btgo.setOnClickListener(this);

    wvbrowser=(WebView)findViewById(R.id.wvbrowser);
    wvbrowser.setWebViewClient(new HelloWebViewClient());
    wvbrowser.getSettings().setJavaScriptEnabled(true);
    wvbrowser.getSettings().setPluginsEnabled(true);
    wvbrowser.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
    wvbrowser.addJavascriptInterface(new MyJavaScriptInterface(),"HTMLOUT");
    //wvbrowser.loadUrl("http://www.google.com");
    wvbrowser.loadUrl("javascript:window.HTMLOUT.showHTML('<html>'+document.getElementsByTagName('html')[0].innerHTML+'</html>');");


    txtcode=(TextView)findViewById(R.id.txtcode);
    txtcode.addTextChangedListener(this);

    btcode=(ImageButton)findViewById(R.id.btcode);
    btcode.setOnClickListener(this);

    }

public void onClick(View v)
{
    if(btgo==v)
    {
        String url=txturl.getText().toString();
        if(!txturl.getText().toString().contains("http://"))
        {
            url="http://"+url;
        }
        wvbrowser.loadUrl(url);
        //wvbrowser.loadData("<html><head></head><body><div style='width:100px;height:100px;border:1px red solid;'></div></body></html>","text/html","utf-8");
    }
    else if(btcode==v)
    {
        ViewGroup.LayoutParams params1=wvbrowser.getLayoutParams();
        ViewGroup.LayoutParams params2=txtcode.getLayoutParams();
        if(flagbtcode==1)
        {
            params1.height=200;
            params2.height=220;
            flagbtcode=0;
            //txtcode.setText(wvbrowser.getContentDescription());
        }
        else
        {
            params1.height=420;
            params2.height=0;
            flagbtcode=1;
        }
        wvbrowser.setLayoutParams(params1);
        txtcode.setLayoutParams(params2);

    }
}

public class HelloWebViewClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {

        view.loadUrl(url);
        return true;
    }
    /*@Override
    public void onPageFinished(WebView view, String url)
    {
        // This call inject JavaScript into the page which just finished loading. 
        wvbrowser.loadUrl("javascript:window.HTMLOUT.processHTML('<head>'+document.getElementsByTagName('html')[0].innerHTML+'</head>');");
    }*/

}
class MyJavaScriptInterface
{
    @SuppressWarnings("unused")
    public void showHTML(String html)
    {

        txtcode.setText(html);
    }
}

public void afterTextChanged(Editable s) {
    // TODO Auto-generated method stub

}

public void beforeTextChanged(CharSequence s, int start, int count,
        int after) {
    // TODO Auto-generated method stub

}

public void onTextChanged(CharSequence s, int start, int before, int count) {
    wvbrowser.loadData("<html><div"+txtcode.getText().toString()+"></div></html>","text/html","utf-8");

}

}
Question&Answers:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Actually this question has many answers. Here are 2 of them :

  • This first is almost the same as yours, I guess we got it from the same tutorial.

public class TestActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.webview);
        final WebView webview = (WebView) findViewById(R.id.browser);
        webview.getSettings().setJavaScriptEnabled(true);
        webview.addJavascriptInterface(new MyJavaScriptInterface(this), "HtmlViewer");

        webview.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageFinished(WebView view, String url) {
                webview.loadUrl("javascript:window.HtmlViewer.showHTML" +
                        "('<html>'+document.getElementsByTagName('html')[0].innerHTML+'</html>');");
            }
        });

        webview.loadUrl("http://android-in-action.com/index.php?post/" +
                "Common-errors-and-bugs-and-how-to-solve-avoid-them");
    }

    class MyJavaScriptInterface {

        private Context ctx;

        MyJavaScriptInterface(Context ctx) {
            this.ctx = ctx;
        }

        public void showHTML(String html) {
            new AlertDialog.Builder(ctx).setTitle("HTML").setMessage(html)
                    .setPositiveButton(android.R.string.ok, null).setCancelable(false).create().show();
        }

    }
}

This way your grab the html through javascript. Not the prettiest way but when you have your javascript interface, you can add other methods to tinker it.


  • An other way is using an HttpClient like there.

The option you choose also depends, I think, on what you intend to do with the retrieved html...


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...