没有互联网消息的WebView片段与拉做刷新 [英] No internet message webview fragment with pull do to refresh
问题描述
我在这里搜索了有关无互联网消息"的网页视图,并尝试了一些代码,但没有成功.我在片段中有一个WebView,我想检查设备是否具有Internet.如果是,则将加载Webview.如果否,则将加载另一个片段,并且该新片段将在没有互联网消息的情况下使布局膨胀,并且该布局将具有刷新按钮(或下拉菜单刷新).那么,我该如何实施网络检查和刷新?
I searched here about "no internet message" for a webview, and i tried some codes, but no sucess. I have one WebView in fragment and i want to check if the device have internet or no. If yes, the webview will load. If no, another fragment will be load, and this new fragment will inflate a layout with the no internet message, and this layout will have a button to refresh (or a pull down to refresh). So, how can i implement the network check and refresh ?
主要活动
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(null == savedInstanceState) {
// set you initial fragment object
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.content, InicioPagina.newInstance());
transaction.commit();
}
WebView片段
public class InicioPagina extends Fragment {
private ProgressBar prg;
SwipeRefreshLayout mySwipeRefreshLayout;
public WebView myWebView;
public static InicioPagina newInstance() {
InicioPagina fragment = new InicioPagina();
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.iniciopagina, container, false);
prg = (ProgressBar)rootView.findViewById(R.id.progressBar2);
mySwipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.swipelayout);
myWebView = (WebView) rootView.findViewById(R.id.inicio_pagina);
myWebView.loadUrl("http://example.com.br/");
//*Ativar JavaScript
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
//*Forçar links para abrir no WebView ao invés do navegador
myWebView.setWebViewClient(new WebViewClient());
myWebView.setVerticalScrollBarEnabled(false);
mySwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
myWebView.reload();
mySwipeRefreshLayout.setRefreshing(false);
}
});
myWebView.setOnKeyListener(new View.OnKeyListener()
{
@Override
public boolean onKey(View v, int keyCode, KeyEvent event)
{
if(event.getAction() == KeyEvent.ACTION_DOWN)
{
WebView webView = (WebView) v;
switch(keyCode)
{
case KeyEvent.KEYCODE_BACK:
if(webView.canGoBack())
{
webView.goBack();
return true;
}
break;
}
}
return false;
}
});
return rootView;
}
public class WebViewClient extends android.webkit.WebViewClient{
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
prg.setVisibility(View.VISIBLE);
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view, String url) {
prg.setVisibility(View.GONE);
super.onPageFinished(view, url);
}
}
内容主xml
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/app_bar_main"
tools:context="br.com.example.example.MainActivity">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<FrameLayout
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"></FrameLayout>
</RelativeLayout>
无互联网布局
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Sem acesso a internet"
android:textAlignment="center"
android:textSize="30sp" />
推荐答案
您可以通过访问网络状态来检查Internet可用性:
You can check internet availability by access to network state :
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
,您可以通过以下方法检查互联网:
and you can check the internet by depend on this method :
private boolean haveNetworkConnection() {
boolean haveConnectedWifi = false;
boolean haveConnectedMobile = false;
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo[] netInfo = cm.getAllNetworkInfo();
for (NetworkInfo ni : netInfo) {
if (ni.getTypeName().equalsIgnoreCase("WIFI"))
if (ni.isConnected())
haveConnectedWifi = true;
if (ni.getTypeName().equalsIgnoreCase("MOBILE"))
if (ni.isConnected())
haveConnectedMobile = true;
}
return haveConnectedWifi || haveConnectedMobile;
}
ex:
if (!haveNetworkConnection()) {
//inflate your fragment, THERE IS NO INTERNET!!
}else {
//you can reload or what ever you want now.
}
这篇关于没有互联网消息的WebView片段与拉做刷新的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!