如何在Android中修复NetworkonMainThreadException？[副本]

Question

<uses-permission android:name="android.permission.INTERNET"/>

首选项：我的android首选项是

<uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

1. API级别18
2. Android 4.3

这就是我如何读取url

static InputStream is = null;

DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);

HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();

11-02 05:23:47.843: E/AndroidRuntime(2207): FATAL EXCEPTION: main
11-02 05:23:47.843: E/AndroidRuntime(2207): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.me.countrypedia/com.me.countrypedia.MainActivity}: android.os.NetworkOnMainThreadException
11-02 05:23:47.843: E/AndroidRuntime(2207):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
11-02 05:23:47.843: E/AndroidRuntime(2207):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
11-02 05:23:47.843: E/AndroidRuntime(2207):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
11-02 05:23:47.843: E/AndroidRuntime(2207):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)

Answer 1

您的异常实际上准确地告诉您哪里做错了。您没有使用另一个线程来执行网络操作。相反，您在UI线程上执行网络操作，这在Android上不能（不）工作。

连接到url的代码应该在AsyncTasksdoinbackground()方法中执行，离开UI线程。

请看这个关于如何使用AsyncTask的问题：如何使用AsyncTask