Android手机计算器(入门级)

【实例截图】

【核心代码】

package org.crazyit.ui;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.GridLayout;
import android.widget.TextView;


public class MainActivity extends Activity
{

    TextView tv;
    int[] buttons;
    int result;
    int result0;
    int result1;

    Button buttonC;
    Button buttonJia;
    Button buttonJian;
    Button buttonCheng;
    Button buttonChu;
    Button buttonDengyu;

    String str1;
    String str2;

    int flag = 0;
    Button temp;

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


        buttonC.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                str1 = "";
                str2 = "";
                tv.setText(str1);
                flag = 0;
            }
        });

        for (int i = 0; i < buttons.length; i  ) {
            temp = (Button) findViewById(buttons[i]);
            temp.setOnClickListener(
                    new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            str1 = tv.getText().toString().trim();
                            str1 = str1   String.valueOf(((Button) v).getText());
                            System.out.println("str1"   ":::"   str1);
                            tv.setText(str1);
                        }
                    });
        }

        buttonListener(buttonJia, 1);
        buttonListener(buttonJian, 2);
        buttonListener(buttonCheng, 3);
        buttonListener(buttonChu, 4);

        buttonDengyu.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                System.out.println(str1);
                result1 = Integer.parseInt(str1);
                if (flag == 1) {
                    result = result0   result1;
                    System.out.println(result0   ":"   result1);
                } else if (flag == 2) {
                    result = result0 - result1;
                } else if (flag == 3) {
                    result = result0 * result1;
                } else if (flag == 4) {
                    result = (int) (result0 / result1);
                }
                String str = (result   "").trim();
                System.out.println(str);

                Bundle data = new Bundle();
                data.putString("Answer",str);
                Intent intent =new Intent(MainActivity.this,LJYActivity.class);
                intent.putExtras(data);
                startActivity(intent);
            }
        });
    }


    public void initButton() {
        tv = (TextView) this.findViewById(R.id.tv);
        str1 = String.valueOf(tv.getText());
        str2 = "";

        buttonC = (Button) this.findViewById(R.id.buttonC);
        buttonJia = (Button) this.findViewById(R.id.buttonJia);
        buttonJian = (Button) this.findViewById(R.id.buttonJian);
        buttonCheng = (Button) this.findViewById(R.id.buttonCheng);
        buttonChu = (Button) this.findViewById(R.id.buttonChu);
        buttonDengyu = (Button) this.findViewById(R.id.buttonDengyu);

        buttons = new int[] {
                R.id.button22, R.id.button17, R.id.button18, R.id.button19,
                R.id.button13, R.id.button14, R.id.button15, R.id.button9,
                R.id.button10, R.id.button11 };
    }


    public void buttonListener(Button button, final int id) {
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String str = tv.getText().toString().trim();
                result0 = Integer.parseInt(str);
                tv.setText("");
                flag = id;
            }
        });
    }
}