Question

我正在成功访问asmx Web服务，但是当没有互联网时，应用程序崩溃了。我已经尝试了一切手段来检测和处理异常是徒劳的请检查我的代码和logcat 的 logcat的：

10-13 14:22:34.748: W/System.err(275):  at java.lang.Thread.run(Thread.java:1096)
10-13 14:22:34.759: W/dalvikvm(275): threadid=7: thread exiting with uncaught exception (group=0x4001d800)
10-13 14:22:34.858: D/dalvikvm(275): GC_FOR_MALLOC freed 4242 objects / 236920 bytes in 62ms
10-13 14:22:34.858: E/AndroidRuntime(275): FATAL EXCEPTION: AsyncTask #1
10-13 14:22:34.858: E/AndroidRuntime(275): java.lang.RuntimeException: An error occured while executing doInBackground()
10-13 14:22:34.858: E/AndroidRuntime(275):  at android.os.AsyncTask$3.done(AsyncTask.java:200)
10-13 14:22:34.858: E/AndroidRuntime(275):  at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
10-13 14:22:34.858: E/AndroidRuntime(275):  at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
10-13 14:22:34.858: E/AndroidRuntime(275):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
10-13 14:22:34.858: E/AndroidRuntime(275):  at java.util.concurrent.FutureTask.run(FutureTask.java:137)
10-13 14:22:34.858: E/AndroidRuntime(275):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
10-13 14:22:34.858: E/AndroidRuntime(275):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
10-13 14:22:34.858: E/AndroidRuntime(275):  at java.lang.Thread.run(Thread.java:1096)
10-13 14:22:34.858: E/AndroidRuntime(275): Caused by: android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
10-13 14:22:34.858: E/AndroidRuntime(275):  at android.view.ViewRoot.checkThread(ViewRoot.java:2802)
10-13 14:22:34.858: E/AndroidRuntime(275):  at android.view.ViewRoot.requestLayout(ViewRoot.java:594)
10-13 14:22:34.858: E/AndroidRuntime(275):  at android.view.View.requestLayout(View.java:8125)
10-13 14:22:34.858: E/AndroidRuntime(275):  at android.view.View.requestLayout(View.java:8125)
10-13 14:22:34.858: E/AndroidRuntime(275):  at android.view.View.requestLayout(View.java:8125)
10-13 14:22:34.858: E/AndroidRuntime(275):  at android.view.View.requestLayout(View.java:8125)
10-13 14:22:34.858: E/AndroidRuntime(275):  at android.widget.RelativeLayout.requestLayout(RelativeLayout.java:254)
10-13 14:22:34.858: E/AndroidRuntime(275):  at android.view.View.requestLayout(View.java:8125)
10-13 14:22:34.858: E/AndroidRuntime(275):  at android.widget.TextView.checkForRelayout(TextView.java:5371)
10-13 14:22:34.858: E/AndroidRuntime(275):  at android.widget.TextView.setText(TextView.java:2688)
10-13 14:22:34.858: E/AndroidRuntime(275):  at android.widget.TextView.setText(TextView.java:2556)
10-13 14:22:34.858: E/AndroidRuntime(275):  at android.widget.TextView.setText(TextView.java:2531)
10-13 14:22:34.858: E/AndroidRuntime(275):  at com.bibleverses.BibleverseActivity$ws.doInBackground(BibleverseActivity.java:190)
10-13 14:22:34.858: E/AndroidRuntime(275):  at com.bibleverses.BibleverseActivity$ws.doInBackground(BibleverseActivity.java:1)
10-13 14:22:34.858: E/AndroidRuntime(275):  at android.os.AsyncTask$2.call(AsyncTask.java:185)
10-13 14:22:34.858: E/AndroidRuntime(275):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
10-13 14:22:34.858: E/AndroidRuntime(275):  ... 4 more
10-13 14:22:35.158: W/IInputConnectionWrapper(275): showStatusIcon on inactive InputConnection
10-13 14:22:36.009: E/WindowManager(275): Activity com.bibleverses.BibleverseActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44f14620 that was originally added here
10-13 14:22:36.009: E/WindowManager(275): android.view.WindowLeaked: Activity com.bibleverses.BibleverseActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44f14620 that was originally added here
10-13 14:22:36.009: E/WindowManager(275):   at android.view.ViewRoot.<init>(ViewRoot.java:247)
10-13 14:22:36.009: E/WindowManager(275):   at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
10-13 14:22:36.009: E/WindowManager(275):   at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
10-13 14:22:36.009: E/WindowManager(275):   at android.view.Window$LocalWindowManager.addView(Window.java:424)
10-13 14:22:36.009: E/WindowManager(275):   at android.app.Dialog.show(Dialog.java:241)
10-13 14:22:36.009: E/WindowManager(275):   at com.bibleverses.BibleverseActivity$ws.onPreExecute(BibleverseActivity.java:240)
10-13 14:22:36.009: E/WindowManager(275):   at android.os.AsyncTask.execute(AsyncTask.java:391)
10-13 14:22:36.009: E/WindowManager(275):   at com.bibleverses.BibleverseActivity$1.onClick(BibleverseActivity.java:107)
10-13 14:22:36.009: E/WindowManager(275):   at android.view.View.performClick(View.java:2408)
10-13 14:22:36.009: E/WindowManager(275):   at android.view.View$PerformClick.run(View.java:8816)
10-13 14:22:36.009: E/WindowManager(275):   at android.os.Handler.handleCallback(Handler.java:587)
10-13 14:22:36.009: E/WindowManager(275):   at android.os.Handler.dispatchMessage(Handler.java:92)
10-13 14:22:36.009: E/WindowManager(275):   at android.os.Looper.loop(Looper.java:123)
10-13 14:22:36.009: E/WindowManager(275):   at android.app.ActivityThread.main(ActivityThread.java:4627)
10-13 14:22:36.009: E/WindowManager(275):   at java.lang.reflect.Method.invokeNative(Native Method)
10-13 14:22:36.009: E/WindowManager(275):   at java.lang.reflect.Method.invoke(Method.java:521)
10-13 14:22:36.009: E/WindowManager(275):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
10-13 14:22:36.009: E/WindowManager(275):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
10-13 14:22:36.009: E/WindowManager(275):   at dalvik.system.NativeStart.main(Native Method)
10-13 14:22:40.798: I/Process(275): Sending signal. PID: 275 SIG: 9

代码：

private class ws extends AsyncTask<String, String, String> {

    @Override
    protected String doInBackground(String... params) {
        // try {

        SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);

        String bk = ed.getText().toString();


        tx1 = (EditText) findViewById(R.id.editText1);
        String Chapter = tx1.getText().toString();
        int chp = Integer.parseInt(Chapter);

        EditText tx2 = (EditText) findViewById(R.id.editText2);
        String verse = tx2.getText().toString();
        int vs = Integer.parseInt(verse);

        //
        //

        request.addProperty("BookTitle", bk);
        request.addProperty("chapter", chp);
        request.addProperty("Verse", vs);

        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
                SoapEnvelope.VER12);
        envelope.dotNet = true;
        envelope.setOutputSoapObject(request);

        HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
        try {

            androidHttpTransport.call(SOAP_ACTION, envelope);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            tv.setText(e.toString());
        } catch (XmlPullParserException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        Object result = null;
        try {
            result = (Object) envelope.getResponse();
        } catch (SoapFault e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        String html = result.toString();

        Document doc = Jsoup.parse(html);

        Elements result2 = doc.select("biblewords");
        String result3 = result2.toString();
        String res = Html.fromHtml(result3).toString();



        return res;
    }

    @Override
    protected void onPostExecute(String res) {
        dialog.dismiss();
        tv.setText(res); // txt.setText(result);

    }

Answer 1

您从AsyncTask主题更改了UI。除了Android中的主线程之外，从任何地方改变UI通常都是一个坏主意，但在AsyncTasks的情况下，明确不允许这样做。

使用onProgressUpdate将消息发送到主线程并更新UI。

Answer 2

我相信你的问题在于这一行：

} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
    tv.setText(e.toString());

注意tv.setText(e.toString());行？您正在AsyncTask线程中设置UI值。我相信这是被禁止的。

尝试将其更改为：

return e.toString();

Answer 3

doInBackgorund()是非UI线程，您无法访问其中的UI元素。 doInBackground（）中的代码在一个单独的非ui线程上运行，该线程无法访问布局中定义的UI元素。

因此，请删除代码“ tv.setText(e.toString()); ”，从doInBackground（）内部访问UI元素，然后将其放入 onPostExecute() 中，这是一个UI线程，在doInBackground（）完成后台处理后调用。

没有网络时崩溃

3 个答案: