阅读网页时出错

时间：2014-05-14 19:07:01

标签： android broadcastreceiver html-parsing

我的应用程序的一部分包括访问网页并解析其文本以获得每日圣经经文。对于主应用程序，我已将代码抛入ASyncTask并且它运行良好，但我试图得到它，以便我可以在广播接收器中做同样的事情并且遇到问题。我已经从doInBackground（）方法复制了代码并设置了以下方法。我所做的唯一更改是在找到它时直接保存收集的数据，而不是将它们存储在临时变量中，以便在onPostExecute（）方法中处理。

public void getVOTD() {
    BufferedReader in = null;
    try {
        HttpClient client = new DefaultHttpClient();
        URI website = new URI("http://verseoftheday.com");
        HttpGet request = new HttpGet();
        request.setURI(website);
        HttpResponse response = client.execute(request);
        response.getStatusLine().getStatusCode();

        in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
        StringBuffer sb = new StringBuffer("");
        String l = "";
        String nl = System.getProperty("line.separator");

        //Read line by line, looking for the sepcific lines on the webpage
        while((l = in.readLine()) != null) {
            sb.append(l + nl);

            if(l.contains("og:title")) {
                ref.setText(l.substring(55, l.length() - 4));
                Toast.makeText(context, ref.getText().toString(), Toast.LENGTH_SHORT).show();
            }
            else if(l.contains("og:description")) {
                String des = l.substring(43,l.length() - 4);
                des = des.replaceAll(""", "\"");
                des = des.replaceAll("'", "'");
                des = des.replaceAll("—", "--");
                ver.setText(des);
                Toast.makeText(context, ver.getText().toString(), Toast.LENGTH_SHORT).show();
            }
        }
        in.close();             
    }
    catch(Exception e) {
        e.printStackTrace();
        ref.setText("Error");
        ver.setText(e.getMessage());
    }
    finally {
        if(in != null) {
            try {
                in.close();
            }
            catch(Exception e) {
                e.printStackTrace();
            }
        }
    }
}

问题是这个方法在尝试读取一行时会抛出异常。该异常没有消息，但我得到以下堆栈跟踪：

05-14 13:54:19.288: W/System.err(23789): android.os.NetworkOnMainThreadException
0

5-14 13:54:19.288: W/System.err(23789):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
05-14 13:54:19.298: W/System.err(23789):    at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
05-14 13:54:19.298: W/System.err(23789):    at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
05-14 13:54:19.298: W/System.err(23789):    at java.net.InetAddress.getAllByName(InetAddress.java:214)
05-14 13:54:19.298: W/System.err(23789):    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
05-14 13:54:19.298: W/System.err(23789):    at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
05-14 13:54:19.298: W/System.err(23789):    at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
05-14 13:54:19.298: W/System.err(23789):    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
05-14 13:54:19.298: W/System.err(23789):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
05-14 13:54:19.298: W/System.err(23789):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
05-14 13:54:19.298: W/System.err(23789):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
05-14 13:54:19.298: W/System.err(23789):    at com.caseybrooks.scripturememory.views.VOTDCard.getVOTD(VOTDCard.java:85)
05-14 13:54:19.298: W/System.err(23789):    at com.caseybrooks.scripturememory.views.VOTDCard.initialize(VOTDCard.java:74)
05-14 13:54:19.298: W/System.err(23789):    at com.caseybrooks.scripturememory.views.VOTDCard.<init>(VOTDCard.java:50)
05-14 13:54:19.298: W/System.err(23789):    at com.caseybrooks.scripturememory.fragments.DashboardFragment.initialize(DashboardFragment.java:76)
05-14 13:54:19.298: W/System.err(23789):    at com.caseybrooks.scripturememory.fragments.DashboardFragment.onCreateView(DashboardFragment.java:50)
05-14 13:54:19.298: W/System.err(23789):    at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
05-14 13:54:19.298: W/System.err(23789):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
05-14 13:54:19.298: W/System.err(23789):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
05-14 13:54:19.298: W/System.err(23789):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
05-14 13:54:19.298: W/System.err(23789):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
05-14 13:54:19.298: W/System.err(23789):    at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:570)
05-14 13:54:19.298: W/System.err(23789):    at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1164)
05-14 13:54:19.298: W/System.err(23789):    at android.app.Activity.performStart(Activity.java:5114)
05-14 13:54:19.298: W/System.err(23789):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2271)
05-14 13:54:19.298: W/System.err(23789):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2358)
05-14 13:54:19.298: W/System.err(23789):    at android.app.ActivityThread.access$600(ActivityThread.java:153)
05-14 13:54:19.298: W/System.err(23789):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247)
05-14 13:54:19.298: W/System.err(23789):    at android.os.Handler.dispatchMessage(Handler.java:99)
05-14 13:54:19.298: W/System.err(23789):    at android.os.Looper.loop(Looper.java:137)
05-14 13:54:19.298: W/System.err(23789):    at android.app.ActivityThread.main(ActivityThread.java:5227)
05-14 13:54:19.298: W/System.err(23789):    at java.lang.reflect.Method.invokeNative(Native Method)
05-14 13:54:19.298: W/System.err(23789):    at java.lang.reflect.Method.invoke(Method.java:511)
05-14 13:54:19.298: W/System.err(23789):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
05-14 13:54:19.298: W/System.err(23789):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
05-14 13:54:19.298: W/System.err(23789):    at dalvik.system.NativeStart.main(Native Method)
05-14 13:54:19.368: D/libEGL(23789): loaded /system/lib/egl/libEGL_adreno200.so
05-14 13:54:19.368: D/libEGL(23789): loaded /system/lib/egl/libGLESv1_CM_adreno200.so
05-14 13:54:19.368: D/libEGL(23789): loaded /system/lib/egl/libGLESv2_adreno200.so
05-14 13:54:19.378: I/Adreno200-EGL(23789): <qeglDrvAPI_eglInitialize:269>: EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_JB_VANILLA.04.02.02.60.051_msm8960_JB_VANILLA_CL2997615_release_AU (CL2997615)
05-14 13:54:19.378: I/Adreno200-EGL(23789): Build Date: 04/11/13 Thu
05-14 13:54:19.378: I/Adreno200-EGL(23789): Local Branch: 
05-14 13:54:19.378: I/Adreno200-EGL(23789): Remote Branch: quic/mako_jb_mr1
05-14 13:54:19.378: I/Adreno200-EGL(23789): Local Patches: NONE
05-14 13:54:19.378: I/Adreno200-EGL(23789): Reconstruct Branch: AU_LINUX_ANDROID_JB_VANILLA.04.02.02.60.051 +  NOTHING
05-14 13:54:19.398: E/(23789): <s3dReadConfigFile:75>: Can't open file for reading
05-14 13:54:19.398: E/(23789): <s3dReadConfigFile:75>: Can't open file for reading
05-14 13:54:19.398: E/(23789): <s3dReadConfigFile:75>: Can't open file for reading
05-14 
13:54:19.398: D/OpenGLRenderer(23789): Enabling debug mode 0

我在这里做错了什么？

1 个答案:

答案 0 :(得分：2)

您遇到的问题是您正在尝试从主线程进行网络连接。这就是你得到这个例外的原因：

NetworkOnMainThreadException

  

当应用程序尝试在其主线程上执行网络操作时引发的异常。

==＆GT;坚持你的第一个想法，并继续从AsyncTask做到这一点，以保持您的应用程序响应。这也适用于BroadcastReceivers，see this guide here：

  

BroadcastReceiver执行时间的具体约束强调了广播接收器的意图：在后台进行小的，离散的工作量，例如保存设置或注册通知。因此，与UI线程中调用的其他方法一样，应用程序应避免在广播接收器中进行长时间运行或计算。

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