Android WebView Component Usage _android

This example describes the Android WebView component usage. Share to everyone for your reference, specific as follows:
If you want WebView to be able to access the network, you must add permissions within Androidmanifest.xml

<uses-permission android:name= "Android.permission.INTERNET"/>

Main.xml is very simple, is a webview

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android=
"http://schemas.android.com/apk/" Res/android "
  android:layout_width=" fill_parent "
  android:layout_height=" fill_parent "
  android:o" rientation= "vertical" >
  <webview
    android:id= "@+id/webview" android:layout_width= "Fill_parent"
    android:layout_height= "fill_parent"/>
</LinearLayout>

Webviewdemoactivity.java Code:

Package COM.TIANJF;
Import android.app.Activity;
Import Android.os.Bundle;
Import Android.webkit.WebView;
public class Webviewdemoactivity extends activity {
  private webview Mwebview;
  @Override public
  void OnCreate (Bundle savedinstancestate) {
    super.oncreate (savedinstancestate);
    Setcontentview (r.layout.main);
    Mwebview = (webview) Findviewbyid (R.id.webview);
    Get WebSettings object, set support JavaScript parameters
    //If JavaScript is available on the page you are accessing, WebView must be set to support JavaScript, otherwise a blank page
    will be displayed Mwebview.getsettings (). Setjavascriptenabled (true);
    Load URL
    mwebview.loadurl ("http://www.baidu.com/");
  }

When you run it, you will see that the URL is properly load out.

But there is a problem, when click on the link to continue browsing, it will pop-up system default browser, in order to be able to continue browsing in WebView, to use the Shouldoverrideurlloading method:

@Override public
void OnCreate (Bundle savedinstancestate) {.............
  .
  //Although the Google homepage is displayed in WebView, if you click on the link to continue browsing, it will be displayed to the system default browser//to
  continue displaying in WebView, You need to rewrite the Shouldoverrideurlloading method
  mwebview.setwebviewclient (New Mywebviewclient ());
  ...........
    }
Private class Mywebviewclient extends Webviewclient {
  @Override public
  boolean shouldoverrideurlloading ( WebView view, String URL) {
    view.loadurl (URL);
    return true;
  }

Also, if you want to return to the previous page by pressing the rollback key,

/**
 * Press the back key to return to the previous page * *
@Override public
boolean onKeyDown (int keycode, keyevent event) {
  if ((keycode = = keyevent.keycode_back) && mwebview.cangoback ()) {
    mwebview.goback ();
    return true;
  }
  Return Super.onkeydown (KeyCode, event);
}

For Android 2.0 There is a new way to start, for the activity can get the back key of the press event, directly rewrite the onbackpressed method, the code is as follows

@Override public
void onbackpressed () {
 ///Here handles the logical code, which applies only to 2.0 or later SDK return
;

If you want to load the HTML in your project, you can use the following method (provided HTML is placed in the assets directory)

Mwebview.loadurl ("file:///android_asset/test.html");

If you want to load an HTML text directly, you can use the following method

Mwebview.loaddata (" 
 

Here are WebView other uses:

Setting allow access to file data

Mwebview.getsettings (). Setallowfileaccess (True);

Setting support Scaling

Mwebview.getsettings (). Setbuiltinzoomcontrols (True);

Set whether to save passwords

Mwebview.getsettings (). Setsavepassword (false);

Setting up support for a variety of different devices

Copy Code code as follows:

Mwebview.getsettings () setuseragentstring ("mozilla/5.0" (IPad; U CPU os 3_2 like Mac os x;en-us) applewebkit/531.21.10 (khtml, like Gecko) version/4.0.4 mobile/7b334bsafari/531.21.10 ");

Some methods to perform when loading an WebView Web page

Mwebview.setwebviewclient (New Webviewclient () {
    //when opening the page with its own definition of webview to display, without the system with the browser to display
    @Override
    public boolean shouldoverrideurlloading (webview view, String URL) {
      view.loadurl (URL);
      return true;
    }
    The work to do when you start loading a Web page
    @Override public
    void onpagestarted (webview view, String URL, Bitmap favicon) {
      super.onpagestarted (view, URL, favicon);
    The work to do when the load completes
    @Override public
    void onpagefinished (webview view, String URL) {
      super.onpagefinished ( view, URL);
    The work to do when loading errors
    @Override public
    void Onreceivederror (webview view, int errorcode,
        String description, String failingurl) {
      super.onreceivederror (view, errorcode, description, Failingurl);
    }
);

Process some dialog box information in a Web page (prompt dialog, with selected dialog box, with Input dialog box)

Mwebview.setwebchromeclient (New Webchromeclient () {//prompt dialog box @Override public boolean Onjsalert (WebView view, String URL, String message, final Jsresult result) {//Build a Builder to display the Alert dialog box in the Web page Builder Builder =
      New Builder (Webviewdemoactivity.this);
      Builder.settitle ("Prompt dialog box");
      Builder.setmessage (message); Builder.setpositivebutton (Android. R.string.ok, New Alertdialog.onclicklistener () {@Override public void OnClick (dialogint
            Erface dialog, int which) {result.confirm ();
      }
          });
      Builder.setcancelable (FALSE);
      Builder.create ();
      Builder.show ();
    return true; ///Button Dialog @Override public boolean onjsconfirm (WebView view, string URL, String message, final Jsre
      Sult result) {Builder Builder = new Builder (webviewdemoactivity.this);
      Builder.settitle ("dialog box with Selection");
      Builder.setmessage (message); BuIlder.setpositivebutton (Android. R.string.ok, New Alertdialog.onclicklistener () {@Override public void OnClick (dialogint
            Erface dialog, int which) {result.confirm ();
      }
          }); Builder.setneutralbutton (Android. R.string.cancel, New Alertdialog.onclicklistener () {@Override public void OnClick (Dialo
            Ginterface dialog, int which) {result.cancel ();
      }
          });
      Builder.setcancelable (FALSE);
      Builder.create ();
      Builder.show ();
    return true; dialog box with input box @Override public boolean onjsprompt (WebView view, string URL, String message, String def Aultvalue, final jspromptresult result) {Layoutinflater Inflater = Layoutinflater. from (Webviewdemoactivi
      Ty.this);
      Final View v = inflater.inflate (r.layout.mydialog, NULL); Sets the hint information ((TextView) v in the TextView corresponding Web page.Findviewbyid (R.id.textview)). SetText (message);
      Sets the input box ((edittext) V.findviewbyid (R.id.edittext) in the EditText corresponding Web page. SetText (defaultvalue);
      Builder Builder = new Builder (webviewdemoactivity.this);
      Builder.settitle ("dialog box with input");
      Builder.setview (v); Builder.setpositivebutton (Android. R.string.ok, New Alertdialog.onclicklistener () {@Override public void OnClick (dialogint Erface dialog, int which) {String value = (edittext) v. Findviewbyid (R.I
              D.edittext)). GetText (). toString ();
            Result.confirm (value);
      }
          }); Builder.setnegativebutton (Android. R.string.cancel, New Alertdialog.onclicklistener () {@Override public void OnClick (Dialo
            Ginterface dialog, int which) {result.cancel ();
      }
          }); Builder.setoncancellistener (New DialogiNterface.
        Oncancellistener () {@Override public void OnCancel (Dialoginterface dialog) {result.cancel ();
      }
      });
      Builder.create ();
      Builder.show ();
    return true; //Set the Web page load progress bar @Override public void onprogresschanged (webview view, int newprogress) {Webviewdemoacti
      Vity.this.getWindow (). Setfeatureint (window.feature_progress, newprogress * 100);
    Super.onprogresschanged (view, newprogress); //Set the title of the application @Override public void Onreceivedtitle (WebView view, String title) {webviewdemoactivity.t
      His.settitle (title);
    Super.onreceivedtitle (view, title);

 }
});

For more information on Android-related content readers can view the site topics: "Android Development Introduction and Advanced Course", "Android Multimedia operating skills Summary (audio, video, recording, etc.)", "Android Basic Components Usage Summary", " Android View tips Summary, Android layout layout tips and a summary of Android controls usage

I hope this article will help you with the Android program.