Musicpleer помогите java android studio

помогите разобратся, что-то не правильно и прога теперь не работает:( а редактор показывает что ошибок нет прога просто вылетает manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.musicpleer">
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <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.MusicPleer">
        <service android:name="com.example.musicpleer.MainActivity"/>

        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:label="@string/app_name"
            android:launchMode="singleTop"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

Mainactivity:

package com.example.musicpleer;

import androidx.appcompat.app.AppCompatActivity;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import android.net.Uri;
import android.content.ContentResolver;
import android.database.Cursor;
import android.widget.ListView;
import android.os.Bundle;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import android.net.Uri;
import android.content.ContentResolver;
import android.database.Cursor;
import android.widget.ListView;

public class MainActivity extends AppCompatActivity {
    private ArrayList<Song> songList;
    private ListView songView;
    public void getSongList() {

        ContentResolver musicResolver = getContentResolver();
        Uri musicUri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
        Cursor musicCursor = musicResolver.query(musicUri, null, null, null, null);
        if (musicCursor != null && musicCursor.moveToFirst()) {
            //get columns
            int titleColumn = musicCursor.getColumnIndex
                    (android.provider.MediaStore.Audio.Media.TITLE);
            int idColumn = musicCursor.getColumnIndex
                    (android.provider.MediaStore.Audio.Media._ID);
            int artistColumn = musicCursor.getColumnIndex
                    (android.provider.MediaStore.Audio.Media.ARTIST);
            //add songs to list
            do {
                long thisId = musicCursor.getLong(idColumn);
                String thisTitle = musicCursor.getString(titleColumn);
                String thisArtist = musicCursor.getString(artistColumn);
                songList.add(new Song(thisId, thisTitle, thisArtist));
            }

            while (musicCursor.moveToNext());


        }
    }
        @Override

    protected void onCreate(Bundle savedInstanceState){
            Collections.sort(songList, new Comparator<Song>(){
                public int compare(Song a, Song b){
                    return a.getTitle().compareTo(b.getTitle());
                }
            });


        songView = (ListView)findViewById(R.id.song_list);
        songList = new ArrayList<Song>();

        getSongList();



        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        Collections.sort(songList, new Comparator<Song>(){
            public int compare(Song a, Song b){
                return a.getTitle().compareTo(b.getTitle());
            }

        });
        songView.setAdapter(songView.getAdapter());


    }

}

Song:

package com.example.musicpleer;

public class Song {
    private long id;
    private String title;
    private String artist;
    public Song(long songID, String songTitle, String songArtist) {
        id=songID;
        title=songTitle;
        artist=songArtist;
    }
    public long getID(){return id;}
    public String getTitle(){return title;}
    public String getArtist(){return artist;}
}

musicservise

package com.example.musicpleer;

public class MusicServise {
}

SongAdapter:

package com.example.musicpleer;

import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;
public class SongAdapter extends BaseAdapter {
    private ArrayList<Song> songs;
    private LayoutInflater songInf;

    @Override
    public int getCount() {
        return songs.size();
    }


    @Override
    public Object getItem(int arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getItemId(int arg0) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        //map to song layout
        LinearLayout songLay = (LinearLayout)songInf.inflate
                (R.layout.song, parent, false);
        //get title and artist views
        TextView songView = (TextView)songLay.findViewById(R.id.song_title);
        TextView artistView = (TextView)songLay.findViewById(R.id.song_artist);
        //get song using position
        Song currSong = songs.get(position);
        //get title and artist strings
        songView.setText(currSong.getTitle());
        artistView.setText(currSong.getArtist());
        //set position as tag
        songLay.setTag(position);
        return songLay;
    }

    public SongAdapter(Context c, ArrayList<Song> theSongs){
        songs=theSongs;
        songInf=LayoutInflater.from(c);
    }

}

layout activitymail:

<?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"
    tools:context=".MainActivity">

    <LinearLayout xmlns:android="https://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical"
        android:background="#FF330000"
        tools:context=".MainActivity" >

        <ListView
            android:id="@+id/song_list"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" >
        </ListView>

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>
song

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:onClick="songPicked"
    android:orientation="vertical"
    android:padding="5dp" >

    <TextView
        android:id="@+id/song_title"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textColor="#FFFFFF99"
        android:textSize="20sp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/song_artist"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textColor="#FFFFFF99"
        android:textSize="18sp" />

</LinearLayout>

menu/main

<menu xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/action_shuffle"
        android:icon="@drawable/sd"
        android:orderInCategory="1"
        android:title="Shuffle"
        app:showAsAction="always" />

    <item
        android:id="@+id/action_end"
        android:icon="@drawable/we"
        android:orderInCategory="2"
        android:title="End"
        app:showAsAction="always" />

</menu>

в drawable добавил картинки, к меню, ошибка

/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.musicpleer, PID: 5654
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.musicpleer/com.example.musicpleer.MainActivity}: java.lang.NullPointerException: Attempt to invoke interface method 'void java.util.List.sort(java.util.Comparator)' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3449)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
     Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'void java.util.List.sort(java.util.Comparator)' on a null object reference
        at java.util.Collections.sort(Collections.java:206)
        at com.example.musicpleer.MainActivity.onCreate(MainActivity.java:52)
        at android.app.Activity.performCreate(Activity.java:8000)
        at android.app.Activity.performCreate(Activity.java:7984)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3422)