1、现有两个Activity，分别为UserinfoActivity和ShowActivity，现在要从UserinfoActivity,中通过一个“查看”按钮切换界面到ShowActivity，并传递如下三个参数:id=1:username="eric”:state=True，且ShowActivity使用 Toast 显示接收到的参数，请写出两个Activity中的核心代码。

在UserinfoActivity中，核心代码如下：

public class UserinfoActivity extends AppCompatActivity {
    private Button mBtnCheck;
    private int mId = 1;
    private String mUsername = "eric";
    private boolean mState = true;

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

        mBtnCheck = findViewById(R.id.btn_check);
        mBtnCheck.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(UserinfoActivity.this, ShowActivity.class);
                intent.putExtra("id", mId);
                intent.putExtra("username", mUsername);
                intent.putExtra("state", mState);
                startActivity(intent);
            }
        });
    }
}

在ShowActivity中，核心代码如下：

public class ShowActivity extends AppCompatActivity {
    private TextView mTvShow;

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

        mTvShow = findViewById(R.id.tv_show);

        Intent intent = getIntent();
        int id = intent.getIntExtra("id", 0);
        String username = intent.getStringExtra("username");
        boolean state = intent.getBooleanExtra("state", false);

        String message = String.format("id=%d,username=%s,state=%b", id, username, state);
        Toast.makeText(this, message, Toast.LENGTH_SHORT).show();

        mTvShow.setText(message);
    }
}