Question

try
    {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://10.0.2.2/insert.php");
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        is = entity.getContent();
        Log.e("pass 1", "connection success ");
    }
    catch(Exception e)
    {
        Log.e("Fail 1", e.toString());
        Toast.makeText(getApplicationContext(), "Invalid IP Address",
                Toast.LENGTH_LONG).show();
    }

我想从我的android应用程序中插入一些值到mysql数据库，它显示错误“无效的IP地址”请帮忙。提前谢谢。

Logcat错误 09-21 12：57：12.084 912-912 / com.srg.ibc.appointmentapplication E / Fail 1：android.os.NetworkOnMainThreadException 09-21 12:57:12.114 912-912 / com.srg.ibc.appointmentapplication E / Fail 2：java.lang.NullPointerException：lock == null 09-21 12：57：12.114 912-912 / com.srg.ibc.appointmentapplication E / Fail 3：java.lang.NullPointerException

Answer 1

您正尝试在主线程上执行网络操作。见How to fix android.os.NetworkOnMainThreadException?

Answer 2

@SuppressLint("NewApi")
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);
    setContentView(R.layout.login);

将此代码添加到您的代码中然后它会工作

Answer 3

我使用Angry IP扫描程序扫描路由器中的主机，获取了路由器分配给我的机器的IP地址，然后将其替换为URL； http://xxx.xxx.x.xxx/cropkeeper/spinner/soilCategory.php

这是我的尝试之物

`try {
        // connectivity to database
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://xxx.xxx.x.xxx/cropkeeper/spinner/soilCategory.php");
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        is = entity.getContent();
    }
    catch(Exception e) {
        Log.e("Fail 3", e.toString());
        Toast.makeText(getApplicationContext(), "Invalid IP Address", Toast.LENGTH_LONG).show();
        finish();
    }`

其中xxx.xxx.x.xxx是我的IP地址。

无效的IP地址Android插入MySQL

3 个答案: