如何從按鈕獲取文本以編輯文本？

Question

此代碼運行良好，但現在當我單擊按鈕 3 button1 = INVISIBLE 編輯文本 = A 時，當我單擊按鈕 2 編輯文本 = AI 想要單擊按鈕編輯文本時從按鈕並檢查編輯文本中的文本

要求：編輯文本獲取字符形式按鈕，將此代碼添加到 function，從數組中刪除最后一個索引

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;

import java.util.Random;


public class MainActivity extends AppCompatActivity {

   LinearLayout linearlayout;
   Button button;
   EditText txt;


    String Array[]= {"car","blue","red","fox"};

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


        linearlayout = findViewById(R.id.linearlayout);
        txt = findViewById(R.id.txt);





        int random = (int) (Math.random() * Array.clone().length);

         StringBuilder word = new StringBuilder(Array[random]);



        for (int i = 0; i < Array[random].length(); i++) {

            char id = 'b';
            button = new Button(this);
            button.setId(id + i);
            linearlayout.addView(button);


            int randIndex = new Random().nextInt(word.length());
            button.setText("" + word.charAt(randIndex));
            word.deleteCharAt(randIndex);



            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {


                    button.setVisibility(View.INVISIBLE);

                    txt.setText(txt.getText().toString() + button.getText());





                }
            });



        }


    }


    }

Answer 1

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;

import java.util.Random;


public class MainActivity extends AppCompatActivity {

    LinearLayout linearlayout;
    //Button button; //TODO: is local var!
    EditText txt; //Global var

    String Array[]= {"car","blue","red","fox"};

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

        linearlayout = findViewById(R.id.linearlayout);
        txt = findViewById(R.id.txt);

        int random = (int) (Math.random() * Array.clone().length);

        StringBuilder word = new StringBuilder(Array[random]);

        for (int i = 0; i < Array[random].length(); i++) {

            char id = 'b';
            final Button button = new Button(this); //local var
            button.setId(id + i);
            linearlayout.addView(button);


            int randIndex = new Random().nextInt(word.length());
            button.setText("" + word.charAt(randIndex));
            word.deleteCharAt(randIndex);

            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    //the problem was here (var button)

                    button.setVisibility(View.INVISIBLE);

                    txt.setText(txt.getText().toString() + button.getText());
                }
            });

        }

    }

}

Answer 2

不確定這些問題，但我確實發現一件事是代碼問題。

txt.setText(txt.getText().toString() + button.getText() );

粗體部分不返回字符序列。 應該與編輯文本相同。

button.getText().toString();