用GridLayout布局管理器设计一个界面，如图所示，共7个按钮,3个文本框。当向第一个和第二个文本框中输入数字，并点击运算符按钮时，则第一行第1个按钮文本变为相应的运算符；当点击OK时，将计算的结果添加到第一行最后一个文本框中。 要求：用JAVA代码实现

好的，我会尽力回答您的问题。

首先，您需要在您的项目中添加GridLayout布局管理器。在您的Activity或Fragment中，您可以这样写：

GridLayout gridLayout = new GridLayout(this);
gridLayout.setColumnCount(4);
gridLayout.setRowCount(4);

这将创建一个4列4行的GridLayout。接下来，您需要创建按钮和文本框，并将它们添加到GridLayout中。您可以使用如下代码创建一个按钮：

Button button = new Button(this);
button.setText("Button");

您可以使用如下代码创建一个文本框：

EditText editText = new EditText(this);

然后，您需要将它们添加到GridLayout中。您可以使用如下代码将一个视图添加到GridLayout中：

gridLayout.addView(view, layoutParams);

其中，`view`是您要添加到GridLayout中的视图，`layoutParams`是一个GridLayout.LayoutParams对象，指定视图应该放置在GridLayout中的哪个位置。

最后，您需要添加一些逻辑来处理输入和计算结果。您可以使用如下代码来监听按钮的点击事件：

button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // 处理点击事件
    }
});

在处理点击事件时，您可以获取文本框中的输入，进行计算，并将结果显示在结果文本框中。

综上所述，以下是一个用GridLayout布局管理器设计的界面的示例代码：

public class MainActivity extends AppCompatActivity {

    private EditText editText1;
    private EditText editText2;
    private EditText resultText;

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

        // 创建GridLayout
        GridLayout gridLayout = new GridLayout(this);
        gridLayout.setColumnCount(4);
        gridLayout.setRowCount(4);

        // 创建按钮和文本框
        Button addButton = new Button(this);
        addButton.setText("+");

        Button subtractButton = new Button(this);
        subtractButton.setText("-");

        Button multiplyButton = new Button(this);
        multiplyButton.setText("*");

        Button divideButton = new Button(this);
        divideButton.setText("/");

        Button clearButton = new Button(this);
        clearButton.setText("C");

        Button okButton = new Button(this);
        okButton.setText("OK");

        editText1 = new EditText(this);
        editText2 = new EditText(this);
        resultText = new EditText(this);
        resultText.setEnabled(false);

        // 添加视图到GridLayout中
        gridLayout.addView(editText1, new GridLayout.LayoutParams(GridLayout.spec(0, 1), GridLayout.spec(0, 3)));
        gridLayout.addView(editText2, new GridLayout.LayoutParams(GridLayout.spec(1, 1), GridLayout.spec(0, 3)));
        gridLayout.addView(addButton, new GridLayout.LayoutParams(GridLayout.spec(2, 1), GridLayout.spec(0)));
        gridLayout.addView(subtractButton, new GridLayout.LayoutParams(GridLayout.spec(2, 1), GridLayout.spec(1)));
        gridLayout.addView(multiplyButton, new GridLayout.LayoutParams(GridLayout.spec(2, 1), GridLayout.spec(2)));
        gridLayout.addView(divideButton, new GridLayout.LayoutParams(GridLayout.spec(2, 1), GridLayout.spec(3)));
        gridLayout.addView(clearButton, new GridLayout.LayoutParams(GridLayout.spec(3, 1), GridLayout.spec(0)));
        gridLayout.addView(okButton, new GridLayout.LayoutParams(GridLayout.spec(3, 1), GridLayout.spec(1)));
        gridLayout.addView(resultText, new GridLayout.LayoutParams(GridLayout.spec(3, 1), GridLayout.spec(2, 2)));

        // 添加点击事件处理逻辑
        addButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                performCalculation("+");
            }
        });

        subtractButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                performCalculation("-");
            }
        });

        multiplyButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                performCalculation("*");
            }
        });

        divideButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                performCalculation("/");
            }
        });

        clearButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editText1.setText("");
                editText2.setText("");
                resultText.setText("");
            }
        });

        okButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text1 = editText1.getText().toString();
                String text2 = editText2.getText().toString();

                if (TextUtils.isEmpty(text1) || TextUtils.isEmpty(text2)) {
                    Toast.makeText(MainActivity.this, "请输入数字", Toast.LENGTH_SHORT).show();
                } else {
                    double num1 = Double.parseDouble(text1);
                    double num2 = Double.parseDouble(text2);
                    double result = performCalculation("+", num1, num2);
                    resultText.setText(String.valueOf(result));
                }
            }
        });

        // 设置ContentView为GridLayout
        setContentView(gridLayout);
    }

    private double performCalculation(String operator, double num1, double num2) {
        switch (operator) {
            case "+":
                return num1 + num2;
            case "-":
                return num1 - num2;
            case "*":
                return num1 * num2;
            case "/":
                if (num2 == 0) {
                    Toast.makeText(this, "除数不能为0", Toast.LENGTH_SHORT).show();
                    return 0;
                } else {
                    return num1 / num2;
                }
            default:
                return 0;
        }
    }

    private void performCalculation(String operator) {
        String text1 = editText1.getText().toString();
        String text2 = editText2.getText().toString();

        if (TextUtils.isEmpty(text1) || TextUtils.isEmpty(text2)) {
            Toast.makeText(this, "请输入数字", Toast.LENGTH_SHORT).show();
        } else {
            double num1 = Double.parseDouble(text1);
            double num2 = Double.parseDouble(text2);
            double result = performCalculation(operator, num1, num2);
            Button operatorButton = getOperatorButton();
            operatorButton.setText(operator);
            resultText.setText(String.valueOf(result));
        }
    }

    private Button getOperatorButton() {
        GridLayout gridLayout = (GridLayout) findViewById(R.id.grid_layout);
        return (Button) gridLayout.getChildAt(2);
    }
}

希望这能帮助到您！