问Splash屏幕加载后应用程序崩溃

EN

package com.example.myapplication;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.view.WindowManager;

import androidx.annotation.RequiresApi;

import com.example.myapplication.MainActivity;
import com.example.myapplication.R;

public class Splash extends MainActivity {
public static int splashTimeout=2000;
    @RequiresApi(api = Build.VERSION_CODES.P)
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);

        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);

        new android.os.Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                Intent intent=new Intent(Splash.this,MainActivity.class);
                startActivity(intent);
                finish();
            }
        } ,splashTimeout );
    }
}

<?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"
    android:background="@drawable/java_bg2"
    tools:context=".Splash">

    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="203dp"
        android:layout_height="172dp"
        android:layout_marginTop="136dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:background="@drawable/java_bg1"
        app:srcCompat="@drawable/java_logo" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="376dp"
        android:layout_height="77dp"
        android:fontFamily="@font/courgette"
        android:gravity="center_horizontal|center_vertical"
        android:outlineAmbientShadowColor="@color/black"
        android:shadowColor="@color/black"

        android:text="@string/software_sucks_because_users_demand_it_to"
        android:textAllCaps="true"
        android:textColor="#FFFFFF"
        android:textSize="24sp"
        android:textStyle="bold|italic"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.457"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/imageView2"
        app:layout_constraintVertical_bias="0.84" />
</androidx.constraintlayout.widget.ConstraintLayout>

package com.example.myapplication;

import android.content.Intent;
import android.os.Bundle;

import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Handler;
import android.view.View;

import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;

import com.example.myapplication.databinding.ActivityMainBinding;

import android.view.Menu;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {


    private AppBarConfiguration appBarConfiguration;
    private ActivityMainBinding binding;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);



        binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        setSupportActionBar(binding.toolbar);

        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);
        appBarConfiguration = new AppBarConfiguration.Builder(navController.getGraph()).build();
        NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);

        binding.fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(MainActivity.this, "Thoda Wait Kar Na Bhai", Toast.LENGTH_SHORT).show();
            }
        });


    }

    private void activity3() {
        System.out.println("Activity3");
    }

    private void activity2() {
        System.out.println("Activity2");
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public boolean onSupportNavigateUp() {
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);
        return NavigationUI.navigateUp(navController, appBarConfiguration)
                || super.onSupportNavigateUp();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/Theme.MyApplication.AppBarOverlay">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/Theme.MyApplication.PopupOverlay" />

    </com.google.android.material.appbar.AppBarLayout>

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType = "centerCrop"
        app:layout_anchor="@+id/include"
        app:layout_anchorGravity="center"
        app:srcCompat="@drawable/background" />

    <include
        android:id="@+id/include"
        layout="@layout/content_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        app:srcCompat="@android:drawable/ic_dialog_email" />



</androidx.coordinatorlayout.widget.CoordinatorLayout>

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

    <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/Theme.MyApplication">
        <activity android:name=".decToHex"/>
        <activity android:name=".MainActivity" />
        <activity android:name=".decToOct" />
        <activity android:name=".decToBin" />
        <activity android:name=".binToHex" />
        <activity android:name=".binToOct" />
        <activity android:name=".binToDec" />
        <activity
            android:name=".Splash"
            android:label="@string/app_name"
            android:theme="@style/Theme.MyApplication.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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


        <meta-data
            android:name="preloaded_fonts"
            android:resource="@array/preloaded_fonts" />
    </application>

</manifest>

2021-06-28 17:41:29.470 6195-6195/com.example.myapplication I/zygote: Not late-enabling -Xcheck:jni (already on)
2021-06-28 17:41:29.493 6195-6195/com.example.myapplication W/zygote: Unexpected CPU variant for X86 using defaults: x86
2021-06-28 17:41:30.696 6195-6273/com.example.myapplication D/OpenGLRenderer: HWUI GL Pipeline
2021-06-28 17:41:30.758 6195-6273/com.example.myapplication I/OpenGLRenderer: Initialized EGL, version 1.4
2021-06-28 17:41:30.758 6195-6273/com.example.myapplication D/OpenGLRenderer: Swap behavior 1
2021-06-28 17:41:30.758 6195-6273/com.example.myapplication W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
2021-06-28 17:41:30.759 6195-6273/com.example.myapplication D/OpenGLRenderer: Swap behavior 0
2021-06-28 17:41:30.789 6195-6273/com.example.myapplication D/EGL_emulation: eglCreateContext: 0xac8b1e60: maj 2 min 0 rcv 2
2021-06-28 17:41:30.802 6195-6273/com.example.myapplication D/EGL_emulation: eglMakeCurrent: 0xac8b1e60: ver 2 0 (tinfo 0xac88b280)
2021-06-28 17:41:30.858 6195-6273/com.example.myapplication D/EGL_emulation: eglMakeCurrent: 0xac8b1e60: ver 2 0 (tinfo 0xac88b280)
2021-06-28 17:41:32.770 6195-6204/com.example.myapplication I/zygote: Do partial code cache collection, code=29KB, data=30KB
2021-06-28 17:41:32.772 6195-6204/com.example.myapplication I/zygote: After code cache collection, code=29KB, data=30KB
2021-06-28 17:41:32.772 6195-6204/com.example.myapplication I/zygote: Increasing code cache capacity to 128KB
2021-06-28 17:41:32.806 6195-6195/com.example.myapplication D/AndroidRuntime: Shutting down VM
2021-06-28 17:41:32.808 6195-6195/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.myapplication, PID: 6195
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.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:2817)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
        at android.app.ActivityThread.-wrap11(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6541)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
     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 androidx.appcompat.app.AppCompatDelegateImpl.setSupportActionBar(AppCompatDelegateImpl.java:575)
        at androidx.appcompat.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:183)
        at com.example.myapplication.MainActivity.onCreate(MainActivity.java:45)
        at android.app.Activity.performCreate(Activity.java:6975)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892) 
        at android.app.ActivityThread.-wrap11(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593) 
        at android.os.Handler.dispatchMessage(Handler.java:105) 
        at android.os.Looper.loop(Looper.java:164) 
        at android.app.ActivityThread.main(ActivityThread.java:6541) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)