java - HTTP POST 请求与 Android 崩溃

Question

我有以下java代码:

try{
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost("http://192.168.1.105/test.php");

    List<NameValuePair> teste = new ArrayList<NameValuePair>(1);
    teste.add(new BasicNameValuePair("test", "test"));
    httppost.setEntity(new UrlEncodedFormEntity(test));

    HttpResponse response = (HttpResponse) httpclient.execute(httppost);
} catch (IOException e) {
    e.printStackTrace();
}

每当我取消注释/注释行 HttpResponse response = (HttpResponse) httpclient.execute(httppost); 时应用程序分别崩溃/不崩溃。 我拥有 list 上的互联网权限，并且我想从服务器获取 json_encoded 消息。我尝试了“一切”，但仍然无法让它发挥作用。

日志:

07-10 15:04:30.197: E/AndroidRuntime(19382): FATAL EXCEPTION: main 07-10 15:04:30.197: E/AndroidRuntime(19382): java.lang.IllegalStateException: Could not execute method of the activity 07-10 15:04:30.197: E/AndroidRuntime(19382): at android.view.View$1.onClick(View.java:3591) 07-10 15:04:30.197: E/AndroidRuntime(19382): at android.view.View.performClick(View.java:4084) 07-10 15:04:30.197: E/AndroidRuntime(19382): at android.view.View$PerformClick.run(View.java:16966) 07-10 15:04:30.197: E/AndroidRuntime(19382): at android.os.Handler.handleCallback(Handler.java:615) 07-10 15:04:30.197: E/AndroidRuntime(19382): at android.os.Handler.dispatchMessage(Handler.java:92) 07-10 15:04:30.197: E/AndroidRuntime(19382): at android.os.Looper.loop(Looper.java:137) 07-10 15:04:30.197: E/AndroidRuntime(19382): at android.app.ActivityThread.main(ActivityThread.java:4745) 07-10 15:04:30.197: E/AndroidRuntime(19382): at java.lang.reflect.Method.invokeNative(Native Method) 07-10 15:04:30.197: E/AndroidRuntime(19382): at java.lang.reflect.Method.invoke(Method.java:511) 07-10 15:04:30.197: E/AndroidRuntime(19382): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 07-10 15:04:30.197: E/AndroidRuntime(19382): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 07-10 15:04:30.197: E/AndroidRuntime(19382): at dalvik.system.NativeStart.main(Native Method) 07-10 15:04:30.197: E/AndroidRuntime(19382): Caused by: java.lang.reflect.InvocationTargetException 07-10 15:04:30.197: E/AndroidRuntime(19382): at java.lang.reflect.Method.invokeNative(Native Method) 07-10 15:04:30.197: E/AndroidRuntime(19382): at java.lang.reflect.Method.invoke(Method.java:511) 07-10 15:04:30.197: E/AndroidRuntime(19382): at android.view.View$1.onClick(View.java:3586) 07-10 15:04:30.197: E/AndroidRuntime(19382): ... 11 more 07-10 15:04:30.197: E/AndroidRuntime(19382): Caused by: android.os.NetworkOnMainThreadException 07-10 15:04:30.197: E/AndroidRuntime(19382): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) 07-10 15:04:30.197: E/AndroidRuntime(19382): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84) 07-10 15:04:30.197: E/AndroidRuntime(19382): at libcore.io.IoBridge.connectErrno(IoBridge.java:127) 07-10 15:04:30.197: E/AndroidRuntime(19382): at libcore.io.IoBridge.connect(IoBridge.java:112) 07-10 15:04:30.197: E/AndroidRuntime(19382): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) 07-10 15:04:30.197: E/AndroidRuntime(19382): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459) 07-10 15:04:30.197: E/AndroidRuntime(19382): at java.net.Socket.connect(Socket.java:842) 07-10 15:04:30.197: E/AndroidRuntime(19382): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119) 07-10 15:04:30.197: E/AndroidRuntime(19382): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144) 07-10 15:04:30.197: E/AndroidRuntime(19382): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 07-10 15:04:30.197: E/AndroidRuntime(19382): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 07-10 15:04:30.197: E/AndroidRuntime(19382): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 07-10 15:04:30.197: E/AndroidRuntime(19382): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 07-10 15:04:30.197: E/AndroidRuntime(19382): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 07-10 15:04:30.197: E/AndroidRuntime(19382): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 07-10 15:04:30.197: E/AndroidRuntime(19382): at com.diverse.just.LoginActivity.newAccount(LoginActivity.java:92) 07-10 15:04:30.197: E/AndroidRuntime(19382): ... 14 more

Answer 1

您必须在另一个线程上执行 HTTP 请求部分。

例如:

        AsyncTask<String, Void, Void> db = null;
    try {
        db = new db_conn(this);
        db.execute("http://192.168.1.5/request.php").get();
    } catch (InterruptedException e) {
        e.printStackTrace();
    } catch (ExecutionException e) {
        e.printStackTrace();
    }

.get() 方法等待 AsyncTask 完成，然后主线程继续执行。

和数据库类:

class db_conn extends AsyncTask<String, Void, Void> {    
    @Override
    protected Void doInBackground(String... params) {
        GetDataFromDB db = new GetDataFromDB();
        String url = params[0];
        System.out.println(url);
        jObject = db.makeHttpRequest(url, "GET", null);
        return null;
    }
....
.....

}