我遇到了网络速度非常慢的问题。出于测试目的，我尝试使用 Android 4.0.4 完全删除 asynctask，当然我需要避免在主线程上进行网络调用，否则会出现 networkNotOnMainThread 异常。所以我将我的电话包裹在一个线程中，但我仍然收到此错误。这到底是怎么回事？？
public class DrupalTestActivity extends Activity {
private Context mCtx;
final static String URL = "http://www.mytestsite.com/";
final static String ENDPOINT = "rest/";
String mResponse = null;
TextView textView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
textView = (TextView) findViewById(R.id.textView);
//retrieves the user account JSON object.
JSONObject mUserAccount = UserAccount.getJSONUserAccount(this);
//login using the JSON
userLogin(mUserAccount);
}
public void userLogin(final JSONObject mUserAccount) {
Thread t = new Thread() {
public void run() {
String uri = URL + ENDPOINT + "user/login";
HttpPost httppost = new HttpPost(uri);
httppost.setHeader("Content-type", "application/json");
StringEntity se;
try {
HttpClient mHttpClient = new DefaultHttpClient();
HttpParams mHttpParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(mHttpParams,
10000);
HttpConnectionParams.setSoTimeout(mHttpParams, 10000);
se = new StringEntity(mUserAccount.toString());
se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,
"application/json"));
httppost.setEntity(se);
Log.d("STATUS", "CALLING DRUPAL");
ResponseHandler<String> handler = new BasicResponseHandler();
mResponse = mHttpClient.execute(httppost, handler);
mHttpClient.getConnectionManager().shutdown();
Log.d("STATUS", "LOGIN COMPLETE");
Log.d("RESPONSE", mResponse);
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
t.run();
}
}
用户帐户方法..我认为这甚至不是问题的一部分。
public static JSONObject getJSONUserAccount(Context ctx) {
SharedPreferences accountSettings = PreferenceManager
.getDefaultSharedPreferences(ctx);
String nUsername = accountSettings.getString("username", "tester");
String nPassword = accountSettings.getString("password", "password");
JSONObject JSONUser = new JSONObject();
try {
JSONUser.put("password", nPassword);
JSONUser.put("username", nUsername);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return JSONUser;
}
日志是..
07-05 10:34:58.377: E/AndroidRuntime(32538): FATAL EXCEPTION: main
07-05 10:34:58.377: E/AndroidRuntime(32538): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.seine.drupal/com.seine.drupal.DrupalTestActivity}: android.os.NetworkOnMainThreadException
07-05 10:34:58.377: E/AndroidRuntime(32538): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2049)
07-05 10:34:58.377: E/AndroidRuntime(32538): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2083)
07-05 10:34:58.377: E/AndroidRuntime(32538): at android.app.ActivityThread.access$600(ActivityThread.java:134)
07-05 10:34:58.377: E/AndroidRuntime(32538): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1233)
07-05 10:34:58.377: E/AndroidRuntime(32538): at android.os.Handler.dispatchMessage(Handler.java:99)
07-05 10:34:58.377: E/AndroidRuntime(32538): at android.os.Looper.loop(Looper.java:137)
07-05 10:34:58.377: E/AndroidRuntime(32538): at android.app.ActivityThread.main(ActivityThread.java:4697)
07-05 10:34:58.377: E/AndroidRuntime(32538): at java.lang.reflect.Method.invokeNative(Native Method)
07-05 10:34:58.377: E/AndroidRuntime(32538): at java.lang.reflect.Method.invoke(Method.java:511)
07-05 10:34:58.377: E/AndroidRuntime(32538): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
07-05 10:34:58.377: E/AndroidRuntime(32538): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
07-05 10:34:58.377: E/AndroidRuntime(32538): at dalvik.system.NativeStart.main(Native Method)
07-05 10:34:58.377: E/AndroidRuntime(32538): Caused by: android.os.NetworkOnMainThreadException
07-05 10:34:58.377: E/AndroidRuntime(32538): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1119)
07-05 10:34:58.377: E/AndroidRuntime(32538): at java.net.InetAddress.lookupHostByName(InetAddress.java:441)
07-05 10:34:58.377: E/AndroidRuntime(32538): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:243)
07-05 10:34:58.377: E/AndroidRuntime(32538): at java.net.InetAddress.getAllByName(InetAddress.java:220)
07-05 10:34:58.377: E/AndroidRuntime(32538): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
07-05 10:34:58.377: E/AndroidRuntime(32538): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
07-05 10:34:58.377: E/AndroidRuntime(32538): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
07-05 10:34:58.377: E/AndroidRuntime(32538): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
07-05 10:34:58.377: E/AndroidRuntime(32538): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
07-05 10:34:58.377: E/AndroidRuntime(32538): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:653)
07-05 10:34:58.377: E/AndroidRuntime(32538): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:627)
07-05 10:34:58.377: E/AndroidRuntime(32538): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:616)
07-05 10:34:58.377: E/AndroidRuntime(32538): at com.seine.drupal.DrupalTestActivity.userLogin(DrupalTestActivity.java:90)
07-05 10:34:58.377: E/AndroidRuntime(32538): at com.seine.drupal.DrupalTestActivity$1.run(DrupalTestActivity.java:65)
07-05 10:34:58.377: E/AndroidRuntime(32538): at com.seine.drupal.DrupalTestActivity.onCreate(DrupalTestActivity.java:69)
07-05 10:34:58.377: E/AndroidRuntime(32538): at android.app.Activity.performCreate(Activity.java:4539)
07-05 10:34:58.377: E/AndroidRuntime(32538): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
07-05 10:34:58.377: E/AndroidRuntime(32538): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2013)
07-05 10:34:58.377: E/AndroidRuntime(32538): ... 11 more
我很困惑，这在 ICS 中一定是新事物，因为这一切都适用于早期版本的 android。我真的被迫使用 AsyncTask 吗？我简直不敢相信。