语法错误：构造函数调用必须是构造函数中的第一条语句

我正在为应用程序设置创建一个导航应用程序。
为此，我正在创建以下代码，但是，正如我在上面的标题中提到的那样，我遇到了语法错误。
请引导我解决这个问题。

这是我的MainActivity.Java

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.view.Menu;
import android.view.View;

public class MainActivity extends Activity {

    public MainActivity() {

    }

    private boolean MyStartActivity(Intent intent) {
        try {
            startActivity(intent);
        } catch (ActivityNotFoundException activitynotfoundexception) {
            return false;
        }

        return true;
    }

    protected boolean isAppInstalled(String s) {
        PackageManager packagemanager = getPackageManager();

        try {
            packagemanager.getPackageInfo(s, 128);
        } catch (android.content.pm.PackageManager.NameNotFoundException namenotfoundexception) {
            return false;
        }

        return true;
    }

    protected void onCreate(Bundle bundle) {
        super.onCreate(bundle);
        setContentView(0x7f030000);

        if (getIntent().getIntExtra("reload", 0) == 1) {
            if (isAppInstalled("com.sample.test")) {
                Intent intent = new Intent("android.settings.APPLICATION_DETAILS_SETTINGS");
                intent.addCategory("android.intent.category.DEFAULT");
                intent.setData(Uri.parse("package:com.sample.test"));
                startActivity(intent);
            } else {
                Toast.makeText(getApplicationContext(), "Game Not Instaled", 0).show();
            }
        }

        ((Button)findViewById(0x7f080000)).setOnClickListener(new android.view.View.OnClickListener() {
            final MainActivity this$0;

            public void onClick(View view) {
                if (isAppInstalled("com.sample.test")) {
                    Intent intent1 = new Intent("android.settings.APPLICATION_DETAILS_SETTINGS");
                    intent1.addCategory("android.intent.category.DEFAULT");
                    intent1.setData(Uri.parse("package:com.sample.test"));
                    startActivity(intent1);

                    return;
                } else {
                    Toast.makeText(getApplicationContext(), "Game Not Instaled", 0).show();

                    return;
                }
            }

            {
                this$0 = MainActivity.this;
                super(); //Constructor call must be the first statement in a constructor
            }
        });
    }

}