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我想我应该开始说我对eclipse和java完全陌生。我正在尝试使用eclipse创建一个启动我的网页的android应用程序。我有一个我的代码很好用的例子，但它非常复制并粘贴到我在网上找到的示例中，所以请原谅我的草率代码。我想知道如何检查互联网或无线连接是否可用..如果没有连接显示警报（无互联网连接）..我发现了一些类似的问题，但是，我只是不知道在哪里放置码？有人可以告诉我吗？检查互联网连接
package com.mysite.news;
import com.mysite.news.R;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class WebActivity extends Activity {
private WebView wv;
private String LASTURL = "";
Menu myMenu = null;
private static final String PREFS_NAME = "MyPrefs";
private Boolean imgOn;
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
setContentView(R.layout.web_view);
wv = (WebView) findViewById(R.id.web_view);
WebSettings webSettings = wv.getSettings();
webSettings.setSavePassword(true);
webSettings.setSaveFormData(true);
webSettings.setJavaScriptEnabled(true);
webSettings.setUseWideViewPort(true);
webSettings.setLoadWithOverviewMode(true);
webSettings.setSupportZoom(false);
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
imgOn = settings.getBoolean("IMGMODE", false);
webSettings.setLoadsImagesAutomatically(imgOn);
final Activity activity = this;
// start ProgressDialog with "Page loading..."
final ProgressDialog dialog = new ProgressDialog(activity);
dialog.setMessage("Page loading...");
dialog.setIndeterminate(true);
dialog.setCancelable(true);
dialog.show();
wv.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
// set address bar and progress
// activity.setTitle(" " + LASTURL);
// activity.setProgress(progress * 100);
if(progress == 100) {
// stop ProgressDialog after loading
dialog.dismiss();
// activity.setTitle(" " + LASTURL);
}
}
});
wv.setWebViewClient(new WebViewClient() {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(getApplicationContext(), "Error: " + description + " " + failingUrl, Toast.LENGTH_LONG).show();
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if(url.indexOf("mysite") <= 0) {
// the link is not for a page on my site, so launch another Activity that handles URLs
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(intent);
return true;
}
return false;
}
public void onPageStarted(WebView view, String url, Bitmap favicon) {
LASTURL = url;
view.getSettings().setLoadsImagesAutomatically(true);
view.getSettings().setBuiltInZoomControls(true);
}
public void onPageFinished(WebView view, String url) {
view.loadUrl("javascript:(function() { " +
"hide('sidebar');" +
//"var parent = document.getElementsByClassName('page-navigation')[0];"+
//"var panel = document.getElementsByClassName('panel-tools')[0];"+
//"var div = document.createElement('div');"+
//"div.innerHTML = panel.innerHTML;"+
//"parent.appendChild(div);"+
//"panel.innerHTML = '';"+
//"div.style['margin-left'] = '31px';"+
"var panel = document.getElementById('search');" +
"panel.style['width'] = '55px';" +
//"var imgs=document.getElementsByTagName('IMG');for(var i=0;i<imgs.length;i++){if (imgs[i].height=60) {imgs[i].src='';imgs[i].width=0;} }"+
//"var urls=document.getElementsByTagName('li');for(var i=0;i<urls.length;i++){if (urls[i].style='margin: -14px 0pt 0pt;'){urls[i].style['display'] = 'none';}}"+
//"hideByClass('panel-tools');"+
"function hide(id){if (document.getElementById(id)){document.getElementById(id).style['display'] = 'none';}}" +
//"function hideByClass(c){var e=document.getElementsByClassName(c);for(var i=0;i<e.length;i++){e[i].style['display'] = 'none';}}"+
"})()");
if(imgOn) {
view.getSettings().setLoadsImagesAutomatically(true);
view.getSettings().setSupportZoom(false);
}
}
});
wv.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
wv.setScrollbarFadingEnabled(false);
wv.loadUrl("http://www.mysite.com");
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if((keyCode == KeyEvent.KEYCODE_BACK) && wv.canGoBack()) {
wv.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
this.myMenu = menu;
MenuItem item = menu.add(0, 1, 0, "MAIN PAGE");
item.setIcon(R.drawable.home);
MenuItem item2 = menu.add(0, 2, 0, "BACK");
item2.setIcon(R.drawable.arrowleft);
MenuItem item3 = menu.add(0, 3, 0, "Reload");
item3.setIcon(R.drawable.s);
MenuItem item4 = menu.add(0, 4, 0, "CLEAR CACHE");
item4.setIcon(R.drawable.trash);
MenuItem item5 = menu.add(0, 5, 0, "Rate");
item5.setIcon(R.drawable.vote);
MenuItem item6 = menu.add(0, 6, 0, "Exit");
item6.setIcon(R.drawable.close);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()) {
case 1:
wv.loadUrl("http://mysite.com");
break;
case 2:
if(wv.canGoBack()) {
wv.goBack();
}
break;
case 3:
wv.loadUrl(LASTURL);
break;
case 4:
wv.clearCache(true);
break;
case 5:
Intent marketIntent2 = new Intent(Intent.ACTION_VIEW, Uri.parse(
"https://play.google.com/store/apps/details?id=" + getPackageName()));
startActivity(marketIntent2);
break;
case 6:
finish();
break;
}
return true;
}
private void saveSettings(Boolean val) {
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("IMGMODE", val);
editor.commit();
}
}
所以下半场（你想放置的代码）在哪里。你只是想在活动启动时进行测试。也许只是在另一个活动中，如果你有互联网连接开始这个活动或以其他方式显示其他内容。这是一个很好的问题分离。 – Blundell 2012-04-22 19:18:21
在执行wv.loadurl（）之前，您必须检查是否有Internet连接。如果有互联网连接 - >继续，如果没有 - >显示消息 – 2012-04-22 19:23:43