错误:包com.google.android.exoplayer2不存在

dependencies {
    implementation 'com.google.android.exoplayer:exoplayer:2.X.X' // 替换为最新版本号
}

import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.VideoView;
import androidx.appcompat.app.AppCompatActivity;
import com.google.android.exoplayer2.SimpleExoPlayer;
import com.google.android.exoplayer2.ui.PlayerView;
import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
import com.google.android.exoplayer2.util.Util;

public class MainActivity extends AppCompatActivity {

    private PlayerView playerView;
    private SimpleExoPlayer player;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        playerView = findViewById(R.id.player_view);
        Button playButton = findViewById(R.id.play_button);

        Uri videoUri = Uri.parse("https://example.com/video.mp4");

        player = new SimpleExoPlayer.Builder(this).build();
        playerView.setPlayer(player);

        DefaultDataSourceFactory dataSourceFactory = new DefaultDataSourceFactory(this,
                Util.getUserAgent(this, "YourAppName"));

        player.setMediaItem(MediaItem.fromUri(videoUri));
        player.prepare();
        player.play();

        playButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (player.getPlaybackState() == Player.STATE_IDLE) {
                    player.play();
                } else if (player.getPlaybackState() == Player.STATE_READY) {
                    player.pause();
                }
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (player != null) {
            player.release();
            player = null;
        }
    }
}