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Я пытался создать генератор случайных чисел для Android, но, похоже, я не могу запустить приложение на виртуальном устройстве без сбоев.

Вот эти ошибки:

 07-01 11:37:00.768: D/AndroidRuntime(2022): Shutting down VM
07-01 11:37:00.808: W/dalvikvm(2022): threadid=1: thread exiting with uncaught exception (group=0xb0d5cb20)
07-01 11:37:00.808: E/AndroidRuntime(2022): FATAL EXCEPTION: main
07-01 11:37:00.808: E/AndroidRuntime(2022): Process: com.bruinstech.numbergen, PID: 2022
07-01 11:37:00.808: E/AndroidRuntime(2022): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.bruinstech.numbergen/com.bruinstech.numbergen.MainAcitivity}: java.lang.ClassNotFoundException: Didn't find class "com.bruinstech.numbergen.MainAcitivity" on path: DexPathList[[zip file "/data/app/com.bruinstech.numbergen-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.bruinstech.numbergen-1, /system/lib]]
07-01 11:37:00.808: E/AndroidRuntime(2022):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at android.os.Handler.dispatchMessage(Handler.java:102)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at android.os.Looper.loop(Looper.java:136)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at android.app.ActivityThread.main(ActivityThread.java:5017)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at java.lang.reflect.Method.invokeNative(Native Method)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at java.lang.reflect.Method.invoke(Method.java:515)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at dalvik.system.NativeStart.main(Native Method)
07-01 11:37:00.808: E/AndroidRuntime(2022): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.bruinstech.numbergen.MainAcitivity" on path: DexPathList[[zip file "/data/app/com.bruinstech.numbergen-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.bruinstech.numbergen-1, /system/lib]]
07-01 11:37:00.808: E/AndroidRuntime(2022):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
07-01 11:37:00.808: E/AndroidRuntime(2022):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2112)
07-01 11:37:00.808: E/AndroidRuntime(2022):     ... 11 more
  

Мой MainActivity.java:
пакет com.bruinstech.numbergen;

 import java.util.Random;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {

EditText nu1;
EditText nu2;
TextView number;
Button button1;
Random randomGenerator = new Random();

@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
            Button button1 = (Button) findViewById(R.id.button1);
    button1.setOnClickListener(new Button.OnClickListener()
    {
        public void onClick(View v){
            int y = Integer.parseInt(nu1.getText().toString());
            int x = Integer.parseInt(nu2.getText().toString());
            number.setText("Random Number: "   randomGenerator(x, y));
        }
    });


    AdView adView = (AdView)this.findViewById(R.id.adView1);
    AdRequest adRequest = new AdRequest.Builder().build();
    adView.loadAd(adRequest);
}

public static int randomGenerator(int y, int x) {


    Random rand = new Random();

    int randomNum = rand.nextInt((y - x)   1)   y;

    return randomNum;
}

}
  

И мой activity_main.xml

 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.android.gms.ads"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<EditText
    android:id="@ id/editText1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="54dp"
    android:ems="10"
    android:hint="@string/value"
    android:inputType="number" />

<EditText
    android:id="@ id/editText2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@ id/editText1"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="41dp"
    android:ems="10"
    android:hint="@string/value"
    android:inputType="number" >

    <requestFocus />
</EditText>

<TextView
    android:id="@ id/nu2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@ id/editText2"
    android:layout_alignRight="@ id/editText2"
    android:layout_below="@ id/editText1"
    android:layout_marginTop="18dp"
    android:text="@string/no2"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:gravity="center" />

<TextView
    android:id="@ id/nu1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@ id/editText1"
    android:layout_alignParentTop="true"
    android:layout_alignRight="@ id/editText1"
    android:layout_marginTop="16dp"
    android:gravity="center"
    android:text="@string/no1"
    android:textAppearance="?android:attr/textAppearanceMedium" />

<Button
    android:id="@ id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@ id/editText2"
    android:layout_alignRight="@ id/editText2"
    android:layout_centerVertical="true"
    android:text="@string/but" />

<TextView
    android:id="@ id/number"
    android:layout_width="wrap_content"
    android:layout_height="20dp"
    android:layout_alignLeft="@ id/button1"
    android:layout_alignRight="@ id/button1"
    android:layout_below="@ id/button1"
    android:layout_marginTop="16dp" />

<com.google.android.gms.ads.AdView 
    android:id="@ id/adView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    ads:adUnitId="@string/ad_unit_id"
    ads:adSize="BANNER"/>

</RelativeLayout>
  

Любая помощь была бы высоко оценена

У вас опечатка в вашем AndroidManifest.xml файл.

com.bruinstech.numbergen.MainAcitivity вместо этого должно быть com.bruinstech.numbergen.MainActivity (в общем, оно должно соответствовать имени вашего класса).

Проблема в вашем AndroidManifest.xml . Проверьте путь к MainActivity, который вы там указали, исправьте его, и ваша проблема должна быть решена.