如何使用 android http 客户端在网站上发布数据？

Question

我必须制作一个可以控制游戏车的安卓应用！ 我有一个搜索栏，我可以控制它的速度！ 并且每一次，它都会改变应用程序将数据发送到朋友的网站上！ 我的问题是，如果我尝试测试应用程序，应用程序就会崩溃！它显示没有失败它只是崩溃！代码如下：

activity_main.xml： '''

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <SeekBar
        android:id="@+id/seekbar"
        style="@style/Widget.AppCompat.SeekBar.Discrete"
        android:layout_width="200dp"
        android:layout_height="50dp"
        android:layout_marginBottom="380dp"
        android:max="10"
        android:rotation="270"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/textseek"
        android:layout_width="100sp"
        android:layout_height="36sp"
        android:layout_marginStart="62sp"
        android:layout_marginLeft="62sp"
        android:layout_marginTop="120sp"
        android:text="@string/_1"
        android:textColor="#00FF00"
        android:textSize="30sp"
        android:textStyle="bold"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageButton
        android:id="@+id/imageButton1"
        android:layout_width="62dp"
        android:layout_height="57dp"
        android:layout_marginStart="62dp"
        android:layout_marginLeft="62dp"
        android:layout_marginBottom="163dp"
        android:contentDescription="@string/leftround"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:srcCompat="@drawable/left" />

    <ImageButton
        android:id="@+id/imageButton2"
        android:layout_width="62dp"
        android:layout_height="57dp"
        android:layout_marginEnd="95dp"
        android:layout_marginRight="95dp"
        android:layout_marginBottom="163dp"
        android:contentDescription="@string/rightround"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:srcCompat="@drawable/right" />


</androidx.constraintlayout.widget.ConstraintLayout>
'''
'''
MainActivity.java:

...
package com.example.unwichtig;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.SeekBar;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.annotation.SuppressLint;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.support.v4.app.RemoteActionCompatParcelizer;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

public class MainActivity extends AppCompatActivity {

    public TextView text;
    public ImageButton left;
    public ImageButton right;
    public int prozess = 0;
    public int AppRichtungL;
    public int AppRichtungR;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        SeekBar sSeekBar = findViewById(R.id.seekbar);
        text = findViewById(R.id.textseek);
        left = (ImageButton) findViewById(R.id.imageButton1);
        right = (ImageButton) findViewById(R.id.imageButton2);

sSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){

            @Override
            public void onProgressChanged(SeekBar sSeekBar, final int progress,
                                          boolean fromUser) {
               // text.setText(String.valueOf(progress*51));
            prozess = Integer.valueOf((progress*51) - 255);
               text.setText(String.valueOf(prozess));

               //stellt je nach Stellung der SeekBar die Richtung ein
                VorRueckwaerts();


               left.setOnTouchListener(new View.OnTouchListener() {
                   @Override
                   public boolean onTouch(View v, MotionEvent event) {
                      switch(event.getAction()){
                          //Wenn Button gedrückt:
                          case MotionEvent.ACTION_DOWN: {
                              prozess = 51;
                              //Microcontroller();
                              //postData();
                                break;
                          }
                          //Wenn Button losgelassen wird:
                          case MotionEvent.ACTION_UP: {
                              prozess = (progress*51)-255;
                              VorRueckwaerts();
                                break;
                          }

                      }
                       return false;
                   }

               });
                right.setOnTouchListener(new View.OnTouchListener() {
                    @Override
                    public boolean onTouch(View v, MotionEvent event) {
                        switch(event.getAction()){
                            //Wenn Button gedrückt:
                            case MotionEvent.ACTION_DOWN: {
                                //Microcontroller();
                                //postData();
                                prozess = 51;
                                AppRichtungL = 0;
                                AppRichtungR = 1;
                                break;
                            }
                            //Wenn Button losgelassen wird:
                            case MotionEvent.ACTION_UP: {
                              prozess = (progress*51)-255;
                                VorRueckwaerts();
                                break;
                            }

                        }
                        return false;
                    }

                });

            }

            @Override
            public void onStartTrackingTouch(SeekBar sSeekBar) {
            }

            @Override
            public void onStopTrackingTouch(SeekBar sSeekBar) {
            }
        });

    }

    public void VorRueckwaerts(){
        if(prozess < 0)
        {
            AppRichtungL = 0;
            AppRichtungR = 0;
        }

        if(prozess > 0)
        {
            AppRichtungL = 1;
            AppRichtungR = 1;
        }
        //Microcontroller();
        //postData();
        send();
    }

    public void send()
    {
        // get the message from the message text box

        // make sure the fields are not empty
        String msg = text.getText().toString();

            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("https://schueler.bulme.at//~maximilian.rupp/spycar");
            try {
                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
                nameValuePairs.add(new BasicNameValuePair("id", "12345"));
                nameValuePairs.add(new BasicNameValuePair("message", msg));
                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                httpclient.execute(httppost);

            } catch (ClientProtocolException e) {
                // TODO Auto-generated catch block
            } catch (IOException e) {
                // TODO Auto-generated catch block
            }


    }
}

'''

Answer 1

您正在尝试从应用程序的 UI（主）线程发送 HTTPS 请求。

这在 Android 和 throws an exception 中是不允许的。

您应该使用AsyncTask 来运行http 代码。

AsyncTask 即将在下一版本的 Android 中被弃用，但它是一种更简单的解决方案（至少在测试期间），然后是 Google 推荐的替代方案 coroutines。