Hello, I recently started learning Android, got this error:

E/AndroidRuntime: FATAL EXCEPTION: main Process: ru.icerock.eventman, PID: 10401 java.lang.RuntimeException: Unable to start activity ComponentInfo{ru.madechaos.test/ru.madechaos.test.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2521) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2595) at android.app.ActivityThread.access$800(ActivityThread.java:178) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1470) at android.os.Handler.dispatchMessage(Handler.java:111) at android.os.Looper.loop(Looper.java:194) at android.app.ActivityThread.main(ActivityThread.java:5631) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754) Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity. at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:355) at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:324) at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:285) at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:143) at ru.icerock.eventman.MainActivity.onCreate(MainActivity.java:16) at android.app.Activity.performCreate(Activity.java:6092) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1112) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2468) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2595) at android.app.ActivityThread.access$800(ActivityThread.java:178) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1470) at android.os.Handler.dispatchMessage(Handler.java:111) at android.os.Looper.loop(Looper.java:194) at android.app.ActivityThread.main(ActivityThread.java:5631) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)

Code:

 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="fill_parent" android:layout_height="fill_parent" tools:context="ru.madechaos.test.MainActivity"> <com.google.android.gms.maps.MapFragment android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/mapView" /> 

 package ru.madechaos.test; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import com.google.android.gms.maps.GoogleMap; import com.google.android.gms.maps.MapFragment; import com.google.android.gms.maps.OnMapReadyCallback; public class MainActivity extends AppCompatActivity implements OnMapReadyCallback { private GoogleMap gMap; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); MapFragment mapFragment = ((MapFragment) getFragmentManager().findFragmentById(R.id.mapView)); mapFragment.getMapAsync(this); } @Override public void onMapReady(GoogleMap googleMap) { gMap = googleMap; setUpMap(); } private void setUpMap() { } }

    1 answer 1

    Error in Manifest.xml file. The current theme is not compatible with the activity from the support library.

    Select the android:theme="@style/Theme.AppCompat.Light" as the theme and it will work.