Android Development--------------WebView (ii) WebView slide bottom Top monitor, load progress bar and other settings

<span id="Label3"></p><p><p>WebView Some of the common settings, sliding monitoring, so that the jump page is also displayed in the webview, loading progress, get title and so on</p></p><p><p><span style="font-size:18px"><strong>one, Slide Monitoring</strong></span></p></p><p><p>Sliding monitoring is required on the basis of WebView on the strengthening, because in WebView no direct monitoring of the sliding method, see WebView Source will find that there is a</p></p><p><p><strong><span style="font-size:18px">protected void onscrollchanged (int l, int t, int oldl, int oldt);</span></strong></p></p><p><p>This method. is protected so we can't use it directly, so we write a reinforced webview, using an interface callback.</p></p><p><p>Scrollwebview</p></p><p><p></p></p><pre code_snippet_id="659516" snippet_file_name="blog_20150505_1_5787745" class="java" name="code">Package Com.song.webviewtest;import Android.content.context;import Android.util.attributeset;import Android.util.log;import android.webkit.webview;/** * Title:ScrollWebView.java * Description: * @author Liusong * @versio N V1.0 */public class Scrollwebview extends WebView {public onscrollchangelistener listener;public scrollwebview (Context context, attributeset attrs, int defstyle) {super (context, attrs, defstyle);} Public Scrollwebview (context context, attributeset attrs) {super (context, attrs);} Public Scrollwebview (context Context) {super (context);} @Overrideprotected void onscrollchanged (int l, int t, int oldl, int oldt) {super.onscrollchanged (l, t, oldl, oldt), float W Ebcontent = getcontentheight () * Getscale ();//webview height float webnow = getheight () + getscrolly ();//current webview height log.i (" TAG1 "," webview.getscrolly () ====>> "+ getscrolly ()), if (math.abs (webcontent-webnow) < 1) {//already at the bottom//log.i (" T AG1 "," already at the bottom "); listener.onpageend (l, t, oldl, oldt);} else if (getscrolly () = = 0) {//log.i ("TAG1", "already at the top"), listener.onpagetop (l, t, oldl, oldt);} else {listener.onscrollchanged (l, t, oldl, oldt);} }public void Setonscrollchangelistener (onscrollchangelistener listener) {this.listener = listener;} public interface Onscrollchangelistener {public void onpageend (int l, int t, int oldl, int oldt);p ublic void Onpagetop (int l, int t, int oldl, int oldt);p ublic void onscrollchanged (int l, int t, int oldl, int oldt);}}</pre><p><p></p></p><p><p><br>then, with this enhanced webview, you can Listen.</p></p><pre code_snippet_id="659516" snippet_file_name="blog_20150505_2_7767684" class="java" name="code">Package Com.song.webviewtest;import Java.util.hashmap;import Java.util.map;import android.app.activity;import Android.os.bundle;import Android.os.handler;import Android.os.message;import Android.webkit.websettings;import Com.song.webviewtest.scrollwebview.onscrollchangelistener;public class Webviewactivity extends Activity {private String URL = "http://192.168.30.199:8080/song/test.html";//execute action public static final int select_image = 0;//open Gallery Public STA Tic Final int open_page = 1;//jump Other specific page public static final int close_or_back = 2;//off or private Scrollwebview mwebview; @Ove rrideprotected void onCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview ( r.layout.activity_webviw); Getintentdatas (); Initview ();} private void Getintentdatas () {//TODO auto-generated Method stuburl = getintent (). Getstringextra ("url");} private void Initview () {mwebview = (scrollwebview) Findviewbyid (r.id.webview);//or webview settingwebsettings Settings = mwebview.getsettings ();//set support js, See squareThe name of the law knows what it means settings.setjavascriptenabled (true);//mwebview.addjavascriptinterface (new javascriptinterface (handler) , "Android"); mwebview.setonscrollchangelistener (new onscrollchangelistener () {@Overridepublic void onscrollchanged ( int l, int t, int oldl, int oldt) {//sliding} @Overridepublic void onpagetop (int l, int t, int oldl, int Oldt) {//swipe to top} @Overri depublic void onpageend (int l, int t, int oldl, int oldt) {//slide to bottom}});//load page path Mwebview.loadurl (url);}}</pre><p><p><br><strong><span style="font-size:18px">2. Let the Web page always show in WebView</span></strong></p></p><p><p><strong><span style="font-size:18px"></span></strong></p></p><p><p>This requires the use of setwebviewclient this method, in the above code to add this sentence can be</p></p><pre code_snippet_id="659516" snippet_file_name="blog_20150505_3_4863193" class="java" name="code"><pre code_snippet_id="659516" snippet_file_name="blog_20150505_3_4863193" class="java" name="code">Webview.setwebviewclient (new webviewclient () {public boolean shouldoverrideurlloading (webview view, String url) {// Override this method to indicate whether to click on the link in the page or in the current WebView jump, do not jump to the browser side//log.i ("TAG", "url--=====>>>" + url); View.loadurl (url); return true;} @Overridepublic void onpagestarted (WebView view, String url, Bitmap favicon) {bar.setvisibility (view.visible); Progbar.setvisibility (view.visible);//log.i ("TAG", "start");} @Overridepublic void onpagefinished (WebView view, String url) {//log.i ("TAG", "end"); bar.setvisibility (view.gone);});</pre></pre><p><p><br>Rewrite public boolean shouldoverrideurlloading (WebView view, String url), add view.loadurl (url) inside, ok.</p></p><p><p><span style="font-size:14px"><strong>3. Then the load progress bar</strong></span></p></p><p><p>Setwebviewclient and setwebchromeclient need to be used together,</p></p><p><p>First of all to add ProgressBar control in the layout, the concrete style defines</p></p><pre code_snippet_id="659516" snippet_file_name="blog_20150505_4_845886" class="html" name="code"><pre code_snippet_id="659516" snippet_file_name="blog_20150505_4_845886" class="html" name="code"><linearlayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http// Schemas.android.com/tools " android:layout_width=" match_parent " android:layout_height=" match_parent " android:orientation= "vertical" > <include layout= "@layout/web_top"/> <progressbar android:id= "@+id/webprogress" style= "? android:attr/progressbarstylehorizontal" android:layout_width= " Fill_parent " android:layout_height=" wrap_content " android:maxheight=" 3dip " android:minheight=" 3dip " /> <com.appsino.bingluo.fycz.ui.web.scrollwebview android:id=" @+id/wv_load " Android:layout_width= "match_parent" android:layout_height= "match_parent"/></pre></pre><p><p>Then you get the control,</p></p><pre code_snippet_id="659516" snippet_file_name="blog_20150505_5_449650" class="java" name="code"><pre code_snippet_id="659516" snippet_file_name="blog_20150505_5_449650" class="java" name="code">Bar = (ProgressBar) Findviewbyid (r.id.webprogress); bar.setmax (100);</pre></pre><p><p>Then it is set up, in Setwebchromeclien there is a specific method to return the page loading progress</p></p><pre code_snippet_id="659516" snippet_file_name="blog_20150505_6_7545157" class="java" name="code"><pre code_snippet_id="659516" snippet_file_name="blog_20150505_6_7545157" class="java" name="code">Webview.setwebchromeclient (new webchromeclient () {public boolean onconsolemessage (consolemessage cm) {return true;} @Overridepublic void onprogresschanged (WebView view, int Newprogress) {bar.setprogress (newprogress);} @Overridepublic void Onreceivedtitle (WebView view, String title) {super.onreceivedtitle (view, title);// Tvtitle.settext (title);}});</pre></pre><p><p><br>Onprogresschanged This method returns, and then setwebviewclient inside the onpagestarted and onpagefinished control the progress bar displayed in the hidden</p></p><p><p><br><span style="font-size:18px"><strong>4. Get the page title</strong></span></p></p><p><p>You can get the title of the page in the webview.setwebchromeclient (new webchromeclient () onreceivedtitle</p></p><p><p> Android Development--------------WebView (ii) WebView slide Bottom Top listening, loading progress bar and other settings </p> </p></span>