MusicWork/main/java/com/example/musicwork/MainActivity.java

package com.example.musicwork;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

import androidx.appcompat.app.AppCompatActivity;

import com.example.musicwork.chuangguan.ChooseLevel;
import com.example.musicwork.chuangguan.Teach;
import com.example.musicwork.freeModel.InitActivity;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Intent intent1 = getIntent();
        final String username = intent1.getStringExtra("username");
        Button button_toFree = (Button) findViewById(R.id.button_toFree);
        button_toFree.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, InitActivity.class);//进入自由模式
                //启动
                startActivity(intent);
            }
        });

        Button button_toChooseLevel = (Button) findViewById(R.id.button_toChooseLevel);
        button_toChooseLevel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, ChooseLevel.class);
                //启动
                startActivity(intent);
                Log.i("TAG", "choose_level_button onClick");
            }

        });

    }

}