MainActivity.java :
package com.example.agendajava;
import android.app.Activity;
public class MainActivity extends Activity{
}
AndroidManifest.xml:
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme"
    tools:ignore="GoogleAppIndexingWarning">
    <activity android:name=".MainActivity">
        <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>Compilador: Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'.
Fala para instalar um tal de Intel HAXM, mas quando faz download não consegue instalar.
Versão:Android Studio 3.5.3 Build #AI-191.8026.42.35.6010548, built on November 15, 2019 JRE: 1.8.0_202-release-1483-b03 amd64 JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o Windows 10 10.0
 
            