I must make an android app, that can controll a playcar! I have a seekbar and with this can i controll how fast it is! And every time, it change the app should send the data on a website of a friend! My Problem is that, if i try to test the app, the app crashs! It shows no fails it simply crash! Here is the code:
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
}
}
}
'''
