我试图从服务器获取一些json字符串,但是当我想连接到服务器时收到此错误:
10-07 10:57:47.410:E / AndroidRuntime(11050):致命异常:主要 10-07 10:57:47.410:E / AndroidRuntime(11050):java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.stampp / com.example.stampp.UI.MainActivity}:android.os.NetworkOnMainThreadException 10-07 10:57:47.410:E / AndroidRuntime(11050):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1970) 10-07 10:57:47.410:E / AndroidRuntime(11050):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995) 10-07 10:57:47.410:E / AndroidRuntime(11050):在android.app.ActivityThread.access $ 600(ActivityThread.java:128) 10-07 10:57:47.410:E / AndroidRuntime(11050):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1161) 10-07 10:57:47.410:E / AndroidRuntime(11050):在android.os.Handler.dispatchMessage(Handler.java:99) 10-07 10:57:47.410:E / AndroidRuntime(11050):在android.os.Looper.loop(Looper.java:137) 10-07 10:57:47.410:E / AndroidRuntime(11050):在android.app.ActivityThread.main(ActivityThread.java:4517) 10-07 10:57:47.410:E / AndroidRuntime(11050):at java.lang.reflect.Method.invokeNative(Native Method) 10-07 10:57:47.410:E / AndroidRuntime(11050):at java.lang.reflect.Method.invoke(Method.java:511) 10-07 10:57:47.410:E / AndroidRuntime(11050):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:993) 10-07 10:57:47.410:E / AndroidRuntime(11050):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760) 10-07 10:57:47.410:E / AndroidRuntime(11050):at dalvik.system.NativeStart.main(Native Method) 10-07 10:57:47.410:E / AndroidRuntime(11050):引起:android.os.NetworkOnMainThreadException 10-07 10:57:47.410:E / AndroidRuntime(11050):在android.os.StrictMode $ AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099) 10-07 10:57:47.410:E / AndroidRuntime(11050):at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84) 10-07 10:57:47.410:E / AndroidRuntime(11050):at libcore.io.IoBridge.connectErrno(IoBridge.java:127) 10-07 10:57:47.410:E / AndroidRuntime(11050):at libcore.io.IoBridge.connect(IoBridge.java:112) 10-07 10:57:47.410:E / AndroidRuntime(11050):at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) 10-07 10:57:47.410:E / AndroidRuntime(11050):at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459) 10-07 10:57:47.410:E / AndroidRuntime(11050):at java.net.Socket.connect(Socket.java:848) 10-07 10:57:47.410:E / AndroidRuntime(11050):at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119) 10-07 10:57:47.410:E / AndroidRuntime(11050):at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144) 10-07 10:57:47.410:E / AndroidRuntime(11050):at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 10-07 10:57:47.410:E / AndroidRuntime(11050):at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 10-07 10:57:47.410:E / AndroidRuntime(11050):at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 10-07 10:57:47.410:E / AndroidRuntime(11050):at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:674) 10-07 10:57:47.410:E / AndroidRuntime(11050):at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:511) 10-07 10:57:47.410:E / AndroidRuntime(11050):at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:489) 10-07 10:57:47.410:E / AndroidRuntime(11050):at com.example.stampp.Services.ConfigurateAPI.ConnectApi.postAuthorization(ConnectApi.java:51) 10-07 10:57:47.410:E / AndroidRuntime(11050):at com.example.stampp.UI.MainActivity.onCreate(MainActivity.java:61) 10-07 10:57:47.410:E / AndroidRuntime(11050):在android.app.Activity.performCreate(Activity.java:4470) 10-07 10:57:47.410:E / AndroidRuntime(11050):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1053) 10-07 10:57:47.410:E / AndroidRuntime(11050):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1934) 10-07 10:57:47.410:E / AndroidRuntime(11050):... 11更多
这是我的代码:
public void getAuthorization(String password, String user) {
String responseString="empty response from api";
String userPassword = user+":"+password;
try {
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(_url);
httpGet.setHeader("Authorization", "Basic "+Base64.encode(userPassword.getBytes(),Base64.NO_WRAP));
HttpResponse httpResponse = httpClient.execute(httpGet);
StatusLine statusLine = httpResponse.getStatusLine();
if(statusLine.getStatusCode() == HttpStatus.SC_OK){
ByteArrayOutputStream out = new ByteArrayOutputStream();
httpResponse.getEntity().writeTo(out);
out.close();
responseString = out.toString();
} else{
//Closes the connection.
httpResponse.getEntity().getContent().close();
throw new IOException(statusLine.getReasonPhrase());
}
}catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
有人可以帮助我吗?
答案 0 :(得分:2)
由于 Android 3.0 ,您无法在主线程上使用网络连接。您最好使用AsynTask
创建doInBackground
来执行httpget
。
答案 1 :(得分:0)
使用一些AsyncTask来完成它。请参阅this基本示例。