java - 尝试在android应用程序中为计算器计算代码

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我正在尝试在android中对计算器应用进行排序。我的布局很好，现在我只需要执行将要计算的代码即可。该应用程序需要在按下时显示该数字，然后如果说按+按钮，它将存储第一个数字，将其清除在屏幕外，获取第二个数字，然后将它们加在一起。当按下等号按钮时，它需要显示结果。

到目前为止，我有

public class Calculator extends Activity {

    public EditText display;
    TextView screen;
    int a, result;
    int c;
    Button b1;
    int sum1, sum2;
    String r;

    public int getSum1(int sum1) {
        return sum1;
    }

    public int getSum2(int sum2) {
        return sum2;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    public void buttonEventHandler(View v) {
        screen=(EditText)findViewById(R.id.screen);
        b1=(Button)findViewById(R.id.button1);
        switch(v.getId()) {

        case R.id.button1 :
            screen.setText(screen.getText() + "1");
            c = +1;
            break;

        case R.id.button2 :
            screen.setText(screen.getText() + "2");
            c = +2;
            break;

        case R.id.button3 :
            screen.setText(screen.getText() + "3");
            c = +3;
            break;

        case R.id.button4 :
            screen.setText(screen.getText() + "4");
            c = +4;
            break;

        case R.id.button5 :
            screen.setText(screen.getText() + "5");
            c = +5;
            break;

        case R.id.button6 :
            screen.setText(screen.getText() + "6");
            c = +6;
            break;

        case R.id.button7 :
            screen.setText(screen.getText() + "7");
            c = +7;
            break;

        case R.id.button8 :
            screen.setText(screen.getText() + "8");
            c = +8;
            break;

        case R.id.button9 :
            screen.setText(screen.getText() + "9");
            c = +9;
            break;

        case R.id.button0 :
            screen.setText(screen.getText() + "0");
            c = +0;
            break;

        case R.id.buttonC :
            screen.setText(screen.getText() + "");
            c = 0;
            break;

        case R.id.buttonPlus :


        case R.id.buttonEquals :



        }


    }
}

怎么做计算？

最佳答案

在sum1中将onCreate设置为零。当用户点击+时，请执行以下操作：


将c添加到sum1
显示sum1
将c重置为零，以便可以输入新数字


当用户点击=时，请执行以下操作：


将c添加到sum1
显示sum1
将c和sum1重置为零


例如，这允许您点击4 + 5 + 6 =并查看15。