ADD file via upload

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

@@ -0,0 +1,47 @@
+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");
+            }
+
+        });
+
+    }
+
+}