エラー - スプラッシュ画面、アンドロイドアプリ

Question

私はアンドロイドの初心者です

私のアンドロイドアプリのスプラッシュ画面を作りたいと思います。私のアプリはスプラッシュ画面の後に続かない - アプリケーションが停止した。問題はどこですか？

はここでここでAndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> 
    <manifest xmlns:android="http://schemas.android.com/apk/res/android" 
     package="com.example.marcin.wirtualnyportfel"> 

     <application 
      android:allowBackup="true" 
      android:icon="@mipmap/ic_launcher" 
      android:label="@string/app_name" 
      android:supportsRtl="true" 
      android:theme="@style/AppTheme"> 
      <activity 
       android:name=".SplashScreen" 
       android:label="@string/app_name" 
       android:screenOrientation="portrait" 
       android:theme="@style/AppTheme.NoActionBar"> 
       <intent-filter> 
        <action android:name="android.intent.action.MAIN" /> 

        <category android:name="android.intent.category.LAUNCHER" /> 
       </intent-filter> 
      </activity> 

だし、ここでlogcat

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.marcin.wirtualnyportfel/com.example.marcin.wirtualnyportfel.MainActivity}: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead. 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707) 
        at android.app.ActivityThread.-wrap12(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:154) 
        at android.app.ActivityThread.main(ActivityThread.java:6077) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 
       Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead. 
        at android.support.v7.app.AppCompatDelegateImplV9.setSupportActionBar(AppCompatDelegateImplV9.java:199) 
        at android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:130) 
        at com.example.marcin.wirtualnyportfel.MainActivity.onCreate(MainActivity.java:34) 
        at android.app.Activity.performCreate(Activity.java:6664) 
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)  
        at android.app.ActivityThread.-wrap12(ActivityThread.java)  
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)  
        at android.os.Handler.dispatchMessage(Handler.java:102)  
        at android.os.Looper.loop(Looper.java:154)  
        at android.app.ActivityThread.main(ActivityThread.java:6077)  
        at java.lang.reflect.Method.invoke(Native Method)  
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)  
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 

Answer 1

のuを行く私のSplashScreen.java

public class SplashScreen extends AppCompatActivity { 
    private static int SPLASH_TIME_OUT = 1500; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_splash_screen); 

     new Handler().postDelayed(new Runnable() { 
      @Override 
      public void run() { 
       Intent i = new Intent(SplashScreen.this, MainActivity.class); 
       startActivity(i); 
       finish(); 
      } 
     }, SPLASH_TIME_OUT); 
    }} 

ですあなたのMainActivityのためのSE android:theme="@style/AppTheme.NoActionBar"