Android检查Internet连接碎片选项卡
我正在尝试检查到我的碎片选项卡的Internet连接。它似乎没有运行。有人能查一下我的密码吗。我希望我的应用程序在加载片段选项卡之前检查互联网连接Android检查Internet连接碎片选项卡,android,Android,我正在尝试检查到我的碎片选项卡的Internet连接。它似乎没有运行。有人能查一下我的密码吗。我希望我的应用程序在加载片段选项卡之前检查互联网连接 public class FreeFragment extends SherlockListFragment implements ActionBar.TabListener { static final String URL = "https://myxml.xml"; static final String KE
public class FreeFragment extends SherlockListFragment implements
ActionBar.TabListener {
static final String URL = "https://myxml.xml";
static final String KEY_SONG = "song";
static final String KEY_ID = "id";
static final String KEY_TITLE = "title";
static final String KEY_CAT_ARTIST = "artistcat";
static final String KEY_DURATION = "duration";
static final String KEY_THUMB_URL = "thumb_url";
static final String KEY_BIG_URL = "big_url";
static final String KEY_CAT_URL = "cat_url";
static final String KEY_DESC = "cat_desc";
ArrayList<HashMap<String, String>> menuItems;
ListAdapter adapter;
Context appContext;
private Fragment mFragment;
@Override
public void onActivityCreated(Bundle savedInstanceState) {
checkInternetConnection();
super.onActivityCreated(savedInstanceState);
}
public class loadListView extends AsyncTask<Integer, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(Integer... args) {
// updating UI from Background Thread
menuItems = new ArrayList<HashMap<String, String>>();
XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL); // getting XML
Document doc = parser.getDomElement(xml); // getting DOM element
NodeList nl = doc.getElementsByTagName(KEY_SONG);
// looping through all item nodes <item>
for (int i = 0; i < nl.getLength(); i++) {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
map.put(KEY_ID, parser.getValue(e, KEY_ID));
map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE));
map.put(KEY_CAT_ARTIST, parser.getValue(e, KEY_CAT_ARTIST));
map.put(KEY_DURATION, parser.getValue(e, KEY_DURATION));
map.put(KEY_THUMB_URL, parser.getValue(e, KEY_THUMB_URL));
map.put(KEY_BIG_URL, parser.getValue(e, KEY_BIG_URL));
map.put(KEY_CAT_URL, parser.getValue(e, KEY_CAT_URL));
map.put(KEY_DESC, parser.getValue(e, KEY_DESC));
// adding HashList to ArrayList
menuItems.add(map);
}
return null;
}
@Override
protected void onPostExecute(String args) {
if (getActivity() != null) {
adapter = new MainPageLazyAdapter(getActivity(), menuItems);
setListAdapter(adapter);
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String thumburl;
String bigurl;
String caturl;
String title;
String desc;
String artist;
Intent in;
title = ((TextView) view.findViewById(R.id.title))
.getText().toString();
artist = ((TextView) view.findViewById(R.id.artist))
.getText().toString();
desc = ((TextView) view.findViewById(R.id.desc))
.getText().toString();
thumburl = ((TextView) view
.findViewById(R.id.thumb_image)).getText()
.toString();
caturl = ((TextView) view.findViewById(R.id.cat))
.getText().toString();
bigurl = ((TextView) view.findViewById(R.id.big_image))
.getText().toString();
in = new Intent(getActivity(),
SingleImageViewActivity.class);
in.putExtra(KEY_TITLE, title);
in.putExtra(KEY_DESC, desc);
in.putExtra(KEY_CAT_URL, caturl);
in.putExtra(KEY_THUMB_URL, thumburl);
in.putExtra(KEY_BIG_URL, bigurl);
in.putExtra(KEY_CAT_ARTIST, artist);
startActivity(in);
}
});
}
}
}
private boolean checkInternetConnection() {
ConnectivityManager cm = (ConnectivityManager) appContext.getSystemService(Context.CONNECTIVITY_SERVICE);
// test for connection
if (cm.getActiveNetworkInfo() != null
&& cm.getActiveNetworkInfo().isAvailable()
&& cm.getActiveNetworkInfo().isConnected()) {
new loadListView().execute();
return true;
} else {
Toast.makeText(appContext, "Internet Connection Required" , Toast.LENGTH_LONG).show();
AlertDialog.Builder builder = new AlertDialog.Builder(appContext);
builder.setMessage("Internet Connection Required")
.setCancelable(false)
.setPositiveButton("Exit", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
System.exit(0);
}
});
AlertDialog alert = builder.create();
alert.show();
}
return false;
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
mFragment = new FreeFragment();
ft.add(android.R.id.content, mFragment);
ft.attach(mFragment);
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
ft.remove(mFragment);
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
}
xml中的问题
String xml = parser.getXmlFromUrl(URL); // getting XML
Document doc = parser.getDomElement(xml); // getting DOM element
// check internet connection
public class MainActivity extends FragmentActivity {
Fragment1 fragment1 = new Fragment1();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(!checkInternet()){
// show error View
}
setContentView(R.layout.activity_main);
}
}
永远不要使用System.exit（0），显示您的doInBackGround方法抱歉，我粘贴了错误的日志。我的应用程序在运行时崩溃了。我没有显示任何应该显示的日志。那是你的申请表吗？11-01 16:28:33.945:E/AndroidRuntime（24539）：在in.wptrafficanalyzer.actionbarsherlocknavtab.XMLParser.getDoElement（XMLParser.java:72）中显示此代码这是我的代码。从主活动到我的子活动，我刚才给你看的logcat是个错误。我想让我的应用程序在加载片段选项卡之前检查internet连接。将ConnectionManager验证添加到FramAgent活动（onCreate方法）中，如果没有连接显示错误对话框或视图，请检查我的编辑。我在片段活动中添加了一个ConnectionManager。但我有一个例外，你对活动对象有问题。将checkInternet方法移到主活动中的onCreate方法。不要打电话给appContext，只要这个。GetSystemService我不明白你的意思。你能告诉我怎么做吗？
// check internet connection
public class MainActivity extends FragmentActivity {
Fragment1 fragment1 = new Fragment1();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(!checkInternet()){
// show error View
}
setContentView(R.layout.activity_main);
}
}