我在我的应用程序中解析rss feed我在加载rss时尝试使用进度条。这是我第一次使用AsyncTask。当我按下rss的按钮时，对话框出现并且当rss停止时load.So，它的工作..但是，我从我的logcat检查，当wifi关闭时，我得到以下错误：
06-22 19:43:16.744: ERROR/OSFP.News(2316): java.lang.RuntimeException: java.net.ConnectException: feeds.feedburner.com/209.85.146.118:80 - Network is unreachable
06-22 19:43:16.744: ERROR/OSFP.News(2316): java.lang.RuntimeException: java.lang.RuntimeException: java.net.ConnectException: feeds.feedburner.com/209.85.146.118:80 - Network is unreachable
06-22 19:43:16.744: ERROR/OSFP.News(2316): at com.example.async.DomFeedParser.parse(DomFeedParser.java:54)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at com.example.async.nea.loadFeed(nea.java:62)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at com.example.async.nea.onCreate(nea.java:51)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at android.os.Handler.dispatchMessage(Handler.java:99)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at android.os.Looper.loop(Looper.java:123)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at android.app.ActivityThread.main(ActivityThread.java:3687)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at java.lang.reflect.Method.invokeNative(Native Method)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at java.lang.reflect.Method.invoke(Method.java:507)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at dalvik.system.NativeStart.main(Native Method)
06-22 19:43:16.744: ERROR/OSFP.News(2316): Caused by: java.lang.RuntimeException: java.net.ConnectException: feeds.feedburner.com/209.85.146.118:80 - Network is unreachable
06-22 19:43:16.744: ERROR/OSFP.News(2316): at com.example.async.BaseFeedParser.getInputStream(BaseFeedParser.java:32)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at com.example.async.DomFeedParser.parse(DomFeedParser.java:26)
06-22 19:43:16.744: ERROR/OSFP.News(2316): ... 15 more
06-22 19:43:16.744: ERROR/OSFP.News(2316): Caused by: java.net.ConnectException: feeds.feedburner.com/209.85.146.118:80 - Network is unreachable
06-22 19:43:16.744: ERROR/OSFP.News(2316): at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:207)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:437)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at java.net.Socket.connect(Socket.java:1002)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:75)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:48)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection$Address.connect(HttpConnection.java:322)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:89)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHttpConnection(HttpURLConnectionImpl.java:285)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.makeConnection(HttpURLConnectionImpl.java:267)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.retrieveResponse(HttpURLConnectionImpl.java:1018)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:512)
06-22 19:43:16.744: ERROR/OSFP.News(2316): at com.example.async.BaseFeedParser.getInputStream(BaseFeedParser.java:30)
06-22 19:43:16.744: ERROR/OSFP.News(2316): ... 16 more
在我的新闻活动中，我已将其用于关闭wifi：
catch (Throwable t){
Log.e("OSFP.News",t.getMessage(),t);
Toast.makeText(nea.this, "Please enable your wifi",
Toast.LENGTH_SHORT).show();
finish();
}
另外，当我按下按钮开始在我的主要活动中加载新闻时，我会使用asyncTask：
nea = (Button) findViewById(R.id.nea);
nea.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new BackgroundAsyncTask().execute();
nea.setClickable(false);
}});
//.......
public class BackgroundAsyncTask extends
AsyncTask<Void, Integer, Void> {
private ProgressDialog dialog;
int myProgress;
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
nea.setClickable(true);
dialog.dismiss();
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
dialog = ProgressDialog.show(main.this, "", "Loading. Please wait...", true);
myProgress = 0;
}
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
Intent newActivity111 = new Intent(main.this, nea.class);
startActivity(newActivity111);
return null;
}
}
另外，在我的DomFeedParser课程中，我有一个例外：
catch (Exception e) {
throw new RuntimeException(e);
}
答案 0 :(得分：1)
不要捕获Exception类
catch (Exception e) {
throw new RuntimeException(e);
}
相反，您应该优雅地处理连接错误
点击此处查看如何正确执行：http://source.android.com/source/code-style.html