java - 如何动态设置GridLayout中按钮的文本？

Question

我尝试在每次迭代中使用 i 的值来为按钮设置文本。
正如您可能通过以下代码意识到的那样，我无法这样做。
你能帮我一下吗？

package com.example.sequenceofnumbers;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.GridLayout;

public class MainActivity extends AppCompatActivity {

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

        GridLayout gl = findViewById(R.id.grid_layout);

        for(int i = 1; i <= 16; i++) { 
            Button btn = new Button(this);
            btn.setText(i+""); // I can't set text in this line.
        }
    }
}

Answer 1

package com.example.sequenceofnumbers;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.GridLayout;
import android.widget.Button; //Include this package.

public class MainActivity extends AppCompatActivity {

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

        GridLayout gl = findViewById(R.id.grid_layout);

        for(int i = 1; i <= 16; i++) { 
            Button btn = new Button(this);
            btn.setText(i+"");
            gl.addView(btn); // Add this line instead.
        }
    }
}