安卓开发表格布局案例简易计算器

以下是一个简单的安卓开发表格布局案例简易计算器的示例代码：

1. 首先，在XML布局文件中添加表格布局和按钮组件：

<TableLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:stretchColumns="*">

    <TableRow>
        <Button
            android:id="@+id/button_clear"
            android:text="C" />
        <Button
            android:id="@+id/button_backspace"
            android:text="&lt;-"
            android:layout_span="2" />
        <Button
            android:id="@+id/button_divide"
            android:text="/" />
    </TableRow>

    <TableRow>
        <Button
            android:id="@+id/button_7"
            android:text="7" />
        <Button
            android:id="@+id/button_8"
            android:text="8" />
        <Button
            android:id="@+id/button_9"
            android:text="9" />
        <Button
            android:id="@+id/button_multiply"
            android:text="*" />
    </TableRow>

    <TableRow>
        <Button
            android:id="@+id/button_4"
            android:text="4" />
        <Button
            android:id="@+id/button_5"
            android:text="5" />
        <Button
            android:id="@+id/button_6"
            android:text="6" />
        <Button
            android:id="@+id/button_subtract"
            android:text="-" />
    </TableRow>

    <TableRow>
        <Button
            android:id="@+id/button_1"
            android:text="1" />
        <Button
            android:id="@+id/button_2"
            android:text="2" />
        <Button
            android:id="@+id/button_3"
            android:text="3" />
        <Button
            android:id="@+id/button_add"
            android:text="+" />
    </TableRow>

    <TableRow>
        <Button
            android:id="@+id/button_0"
            android:text="0"
            android:layout_span="2" />
        <Button
            android:id="@+id/button_decimal"
            android:text="." />
        <Button
            android:id="@+id/button_equals"
            android:text="=" />
    </TableRow>

</TableLayout>

2. 在Java代码中添加按钮点击事件和计算逻辑：

public class MainActivity extends AppCompatActivity {

    private TextView mTextView;
    private String mOperand1;
    private String mOperand2;
    private String mOperator;

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

        mTextView = findViewById(R.id.text_view);

        Button buttonClear = findViewById(R.id.button_clear);
        buttonClear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mOperand1 = null;
                mOperand2 = null;
                mOperator = null;
                mTextView.setText("");
            }
        });

        Button buttonBackspace = findViewById(R.id.button_backspace);
        buttonBackspace.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = mTextView.getText().toString();
                if (text.length() > 0) {
                    text = text.substring(0, text.length() - 1);
                    mTextView.setText(text);
                }
            }
        });

        Button buttonDivide = findViewById(R.id.button_divide);
        buttonDivide.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mOperand1 = mTextView.getText().toString();
                mOperator = "/";
                mTextView.setText("");
            }
        });

        Button buttonMultiply = findViewById(R.id.button_multiply);
        buttonMultiply.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mOperand1 = mTextView.getText().toString();
                mOperator = "*";
                mTextView.setText("");
            }
        });

        Button buttonSubtract = findViewById(R.id.button_subtract);
        buttonSubtract.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mOperand1 = mTextView.getText().toString();
                mOperator = "-";
                mTextView.setText("");
            }
        });

        Button buttonAdd = findViewById(R.id.button_add);
        buttonAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mOperand1 = mTextView.getText().toString();
                mOperator = "+";
                mTextView.setText("");
            }
        });

        Button buttonDecimal = findViewById(R.id.button_decimal);
        buttonDecimal.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = mTextView.getText().toString();
                if (!text.contains(".")) {
                    mTextView.append(".");
                }
            }
        });

        Button buttonEquals = findViewById(R.id.button_equals);
        buttonEquals.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mOperand2 = mTextView.getText().toString();
                double result = 0;
                switch (mOperator) {
                    case "/":
                        result = Double.parseDouble(mOperand1) / Double.parseDouble(mOperand2);
                        break;
                    case "*":
                        result = Double.parseDouble(mOperand1) * Double.parseDouble(mOperand2);
                        break;
                    case "-":
                        result = Double.parseDouble(mOperand1) - Double.parseDouble(mOperand2);
                        break;
                    case "+":
                        result = Double.parseDouble(mOperand1) + Double.parseDouble(mOperand2);
                        break;
                }
                mTextView.setText(String.valueOf(result));
            }
        });

        Button button0 = findViewById(R.id.button_0);
        button0.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mTextView.append("0");
            }
        });

        Button button1 = findViewById(R.id.button_1);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mTextView.append("1");
            }
        });

        Button button2 = findViewById(R.id.button_2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mTextView.append("2");
            }
        });

        Button button3 = findViewById(R.id.button_3);
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mTextView.append("3");
            }
        });

        Button button4 = findViewById(R.id.button_4);
        button4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mTextView.append("4");
            }
        });

        Button button5 = findViewById(R.id.button_5);
        button5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mTextView.append("5");
            }
        });

        Button button6 = findViewById(R.id.button_6);
        button6.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mTextView.append("6");
            }
        });

        Button button7 = findViewById(R.id.button_7);
        button7.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mTextView.append("7");
            }
        });

        Button button8 = findViewById(R.id.button_8);
        button8.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mTextView.append("8");
            }
        });

        Button button9 = findViewById(R.id.button_9);
        button9.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mTextView.append("9");
            }
        });

    }
}

3. 运行应用程序并测试计算器。