如何回到previous页面,如果后退按钮是pssed中的WebView $ P $? [英] How to go back to previous page if back button is pressed in WebView?
问题描述
我有一个应用程序中,我有一个的WebView
在这里我展示一些网站。它的工作原理,点击网页的链接进入下一个页面里面我的应用程序的网站。但是,当我点击手机的返回按钮,它需要我直入我的应用程序。我想回到previous页面在网站上代替。我怎样才能做到这一点?
下面是我使用的code样品:</ P>
公共类Webdisplay延伸活动{
@覆盖
公共无效的onCreate(包savedInstanceState){
// TODO自动生成方法存根
super.onCreate(savedInstanceState);
。this.getWindow()requestFeature(Window.FEATURE_PROGRESS);
的setContentView(R.layout.webdisplay);
getWindow()。setFeatureInt(Window.FEATURE_PROGRESS,
Window.PROGRESS_VISIBILITY_ON);
吐司loadingmess = Toast.makeText(这一点,
Cargando厄尔尼诺日报霍伊,Toast.LENGTH_SHORT);
loadingmess.show();
的WebView myWebView;
myWebView =(web视图)findViewById(R.id.webview);
myWebView.getSettings()setJavaScriptEnabled(真)。
myWebView.loadUrl(http://www.elsalvador.com);
myWebView.setWebViewClient(新WebViewClient());
myWebView.setInitialScale(1);
。myWebView.getSettings()setBuiltInZoomControls(真正的);
。myWebView.getSettings()setUseWideViewPort(真正的);
最后活动MyActivity =这一点;
myWebView.setWebChromeClient(新WebChromeClient()
{
公共无效onProgressChanged(web视图来看,INT进度)
{
MyActivity.setTitle(载入中...);
MyActivity.setProgress(进度* 100);
如果(进度== 100)
MyActivity.setTitle(R.string.app_name);
}
});
}
}
我用这样的事情在我的活动WebViews:
@覆盖
公共布尔的onkeydown(INT键code,KeyEvent的事件){
如果(event.getAction()== KeyEvent.ACTION_DOWN){
开关(钥匙code){
案例KeyEvent.KEY code_BACK:
如果(mWebView.canGoBack()){
mWebView.goBack();
} 其他 {
完();
}
返回true;
}
}
返回super.onKeyDown(键code,事件);
}
编辑:
有关此code的工作,你需要一个字段添加到活动
包含web视图:
私人的WebView mWebView;
初始化它在的onCreate()
方法,你应该是好去。
mWebView =(web视图)findViewById(R.id.webView);
I have an app in which I have a WebView
where I display some websites. It works, clicking a link in the webpage goes to the next page in the website inside my app. But when I click the phone's back button, it takes me straight into my app. I want to go back to the previous page in the website instead. How can I do this?
Here is the code sample I'm using:
public class Webdisplay extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
setContentView(R.layout.webdisplay);
getWindow().setFeatureInt(Window.FEATURE_PROGRESS,
Window.PROGRESS_VISIBILITY_ON);
Toast loadingmess = Toast.makeText(this,
"Cargando El Diario de Hoy", Toast.LENGTH_SHORT);
loadingmess.show();
WebView myWebView;
myWebView = (WebView) findViewById(R.id.webview);
myWebView.getSettings().setJavaScriptEnabled(true);
myWebView.loadUrl("http://www.elsalvador.com");
myWebView.setWebViewClient(new WebViewClient());
myWebView.setInitialScale(1);
myWebView.getSettings().setBuiltInZoomControls(true);
myWebView.getSettings().setUseWideViewPort(true);
final Activity MyActivity = this;
myWebView.setWebChromeClient(new WebChromeClient()
{
public void onProgressChanged(WebView view, int progress)
{
MyActivity.setTitle("Loading...");
MyActivity.setProgress(progress * 100);
if(progress == 100)
MyActivity.setTitle(R.string.app_name);
}
});
}
}
I use something like this in my activities with WebViews:
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
if (mWebView.canGoBack()) {
mWebView.goBack();
} else {
finish();
}
return true;
}
}
return super.onKeyDown(keyCode, event);
}
Edit:
For this code to work, you need to add a field to the Activity
containing the WebView:
private WebView mWebView;
Initialize it in the onCreate()
method and you should be good to go.
mWebView = (WebView) findViewById(R.id.webView);
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