由于我已经上传了启动画面，因此我的应用程序一直崩溃而没有显示任何内容

Question

我在原始视频中添加了4秒的视频（视频名称是第一个） 我已经尝试了很长时间，但是找不到任何解决方案。.这里的任何人都可以帮助我

这是Splash Java文件：

打包com.example.aninterface;

import android.content.Intent;
import android.media.MediaPlayer;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.WindowManager;
import android.widget.VideoView;


public class Videoactivity extends AppCompatActivity {

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

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

        setContentView(R.layout.activity_main);

        getSupportActionBar().hide();

        videoView =(VideoView) findViewById(R.id.videoView);

        Uri video = Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.first);

        videoView.setVideoURI(video);

        videoView.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {

                if(isFinishing())

                    return;

                startActivity(new Intent(Videoactivity.this, MainActivity.class));

            }
        });

        videoView.start();
    }
}

这是我的android manifest.xml文件：

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="Interface"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity
            android:name=".Videoactivity"
            android:label="Interface" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <activity
            android:name=".MainActivity"
            android:label="Interface">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
        </intent-filter>

        </activity>
        <activity android:name=".Signup" />
        <activity android:name=".Login" />


    </application>

</manifest> 

我也尝试过该清单，但是仍然无法正常工作：

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="Interface"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity
            android:name=".Videoactivity"
            android:label="Interface" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <activity
            android:name=".MainActivity"
            android:label="Interface">
        </activity>
        <activity android:name=".Signup" />
        <activity android:name=".Login" />


    </application>

</manifest>

我的日志：

2019-03-14 18:04:43.849 10824-10824/com.example.aninterface E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.aninterface, PID: 10824
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.aninterface/com.example.aninterface.Videoactivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.VideoView.setVideoURI(android.net.Uri)' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.VideoView.setVideoURI(android.net.Uri)' on a null object reference
        at com.example.aninterface.Videoactivity.onCreate(Videoactivity.java:29)
        at android.app.Activity.performCreate(Activity.java:7136)
        at android.app.Activity.performCreate(Activity.java:7127)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:193) 
        at android.app.ActivityThread.main(ActivityThread.java:6669) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 

有人可以帮助我。