Android: webview implements a simple browser

Android: webview implements a simple browser

Enables the browser to return to the forward homepage and exit the URL entry function.

The comment is very clear.

First, layout files

 

<Linearlayout xmlns: android = "http://schemas.android.com/apk/res/android" android: layout_width = "fill_parent" android: layout_height = "fill_parent" android: orientation = "vertical"> <linearlayout android: orientation = "horizontal" android: layout_width = "fill_parent" android: layout_height = "wrap_content"> <edittext android: id = "@ + id/et_url" android: layout_width = "320dp" android: layout_height = "wrap_content"> <button android: id = "@ + id/btn_login" android: layout_height = "wrap_content" android: layout_width = "wrap_content" android: text = "login"> <webview android: layout_weight = "2" android: id = "@ + id/webView" android: layout_width = "fill_parent" android: layout_height = "fill_parent"> <linearlayout android: layout_weight = "7.5" android: layout_width = "fill_parent" android: layout_height = "fill_parent" android: orientation = "horizontal" android: background = "#000000"> </linearlayout> </webview> </button> <button android: id = "@ + id/btn_back" android: layout_weight = "1" android: layout_height = "wrap_content" android: layout_width = "wrap_content" android: text = "Courier"> </button> <button android: id = "@ + id/btn_menu" android: layout_weight = "1" android: layout_height = "wrap_content" android: layout_width = "wrap_content" android: text = "Homepage"> </button> <button android: id = "@ + id/btn_forward" android: layout_weight = "1" android: layout_height = "wrap_content" android: layout_width = "wrap_content" android: text = "→"> </button> <button android: id = "@ + id/btn_exit" android: layout_weight = "1" android: layout_height = "wrap_content" android: layout_width = "wrap_content" android: text = "exit"> </button> </edittext> </linearlayout>

MainActivity

Package com. example. webview; import android. OS. bundle; import android. app. activity; import android. view. keyEvent; import android. view. view; import android. view. view. onClickListener; import android. view. window; import android. webkit. webChromeClient; import android. webkit. webSettings; import android. webkit. webView; import android. webkit. webViewClient; import android. widget. button; import android. widget. editText; public class MainActivity extends Activity implements OnClickListener {private String url = null; private WebView webView; private EditText et_url; private Button btn_login; private Button btn_back; private Button btn_exit; private Button btn_forward; private Button btn_menu; @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); // Window progress bar requestWindowFeature (Window. FEATURE_INDETERMINATE_PROGRESS); setContentView (R. layout. activity_main); setProgressBarIndeterminate (true); webView = (WebView) findViewById (R. id. webView); et_url = (EditText) findViewById (R. id. et_url); btn_login = (Button) findViewById (R. id. btn_login); btn_back = (Button) findViewById (R. id. btn_back); btn_exit = (Button) findViewById (R. id. btn_exit); btn_forward = (Button) findViewById (R. id. btn_forward); btn_menu = (Button) findViewById (R. id. btn_menu); // Add the listener event listener (this); btn_back.setOnClickListener (this); listener (this); btn_forward.setOnClickListener (this); listener (this );} // After the btn_login trigger event is clicked, webView starts to read urlprotected void startReadUrl (String url) {// TODO Auto-generated method stub // webView loads the web Resource webView. loadUrl (url); // overwrite webView by default, the web page is opened through the system or a third-party browser. // webView is called if false. setWebViewClient (new WebViewClient () {@ Overridepublic boolean shouldOverrideUrlLoading (WebView view, String url) {// TODO Auto-generated method stub // webView loads the web resource view. loadUrl (url); return true ;}}); // enables support for javascriptWebSettings settings = webView. getSettings (); settings. setJavaScriptEnabled (true); // The cache is used to load settings on the web page. setCacheMode (WebSettings. LOAD_CACHE_ELSE_NETWORK); // when the page is opened, the progress bar webView is hidden when the page is fully opened. setWebChromeClient (new WebChromeClient () {@ Overridepublic void onProgressChanged (WebView view, int newProgress) {// TODO Auto-generated method stubsetTitle ("this page has been loaded" + newProgress + "%"); if (newProgress = 100) {closeProgressBar ();} else {openProgressBar (newProgress);} super. onProgressChanged (view, newProgress) ;}}); // open the progress bar protected void openProgressBar (int x) {// TODO Auto-generated method stubsetProgressBarIndeterminateVisibility (true ); setProgress (x);} // close the progress bar protected void closeProgressBar () {// TODO Auto-generated method stubsetProgressBarIndeterminateVisibility (false );} // rewrite the logic of the physical button return key @ Overridepublic boolean onKeyDown (int keyCode, KeyEvent event) {// TODO Auto-generated method stubif (keyCode = KeyEvent. KEYCODE_BACK) {if (webView. canGoBack () {// returns the webView on the previous page. goBack (); return true;} else {// exit program finish () ;}} return super. onKeyDown (keyCode, event);} // handle button events @ Overridepublic void onClick (View v) {// TODO Auto-generated method stubswitch (v. getId () {case R. id. btn_login: url = "http: //" + et_url.getText (). toString (); url = url. replace ("", ""); startReadUrl (url); break; case R. id. btn_back: if (webView. canGoBack () {webView. goBack () ;}else {finish () ;}break; case R. id. btn_forward: if (webView. canGoForward () {webView. goForward ();} break; case R. id. btn_exit: finish (); break; case R. id. btn_menu: startReadUrl ("http://www.baidu.com"); break ;}}}

Do not forget to configure the network access permission in the AndroidManifest. xml file.

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