“方法从未使用过”，尽管它正在使用 - Android studio

Question

As it is said, it gives this message although it is being used. It is somehow not being identified. Here is the java class

package com.example.exploringlayouts;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main_menu);


    }
    void loadConstraintLayout(View v){
        setContentView(R.layout.activity_main);
    }

    void loadTableLayout(View v){
       // setContentView(R.layout.my_table_layout);
    }
    void loadMenuLayout(View v){
        setContentView(R.layout.main_menu);
    }
}

and here part of the OnClick segment that involves that method said that is not used.

<Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0.1"
            android:onClick="loadConstraintLayout"       #<-----Here it is.
            android:text="LOAD"
            android:textSize="15sp" />

What can possibly be the problem?

Answer 1

只需将 public 修饰符添加到您的方法中。

Answer 2

Your methods will need to be set to public void. This is important in OOP languages as your function cannot be called outside of the class now.