Android计算器

Android计算器

主程序:MainActivity.java

package com.example.calcdemo;

import java.text.DecimalFormat;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.*;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.*;

public class MainActivity extends Activity implements OnClickListener,
        OnTouchListener {

    private EditText editText;
    private Button[] btn1 = new Button[10];
    private Button[] btn2 = new Button[8];
    private int data1[] = { R.id.btn0, R.id.btn1, R.id.btn2, R.id.btn3,
            R.id.btn4, R.id.btn5, R.id.btn6, R.id.btn7, R.id.btn8, R.id.btn9 };
    private int data2[] = { R.id.btnChu, R.id.btnDian, R.id.btnJia,
            R.id.btnJian, R.id.btnRes, R.id.btnSheng, R.id.ce, R.id.backspace };
    private StringBuffer s = new StringBuffer();
    private String s1 = null;
    private String s2 = null;
    private String temp = null;
    private String split = null;
    private Double sum1;
    private Double sum2;

    protected void onCreate(Bundle save) {
        super.onCreate(save);
        // requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        editText = (EditText) findViewById(R.id.edit_text);
        initArray();
    }

    private void getRes() {
        DecimalFormat dt = (DecimalFormat) DecimalFormat.getInstance(); dt.applyPattern("0.0000"); 
Double sum = null;
        String t1 = temp;
        String t = s.toString();
        if (t.length() != 0
                && (t.contains("+") || t.contains("-") || t.contains("*") || t
                        .contains("/"))) {
            if (temp.equals("/") || temp.equals("*") || temp.equals("+")) {
                temp = "\\" + t1;
            }
            String ss[] = t.split(temp);
            temp = t1;
            sum1 = Double.parseDouble(ss[0]);
            sum2 = Double.parseDouble(ss[1]);
            if (temp.equals("/"))
                sum = sum1 / sum2;
            else if (temp.equals("*"))
                sum = sum1 * sum2;
            else if (temp.equals("+"))
                sum = sum1 + sum2;
            else if (temp.equals("-"))
                sum = sum1 - sum2;
            if (!(t1.contains("/") || t1.contains(".")))
                dt.applyPattern("0");
            editText.setText(dt.format(sum).toString());
            s = new StringBuffer();
        } else
            editText.setText(t);

    }

    // 初始化Button数组
    private void initArray() {
        int len1 = data1.length;
        int len2 = data2.length;
        for (int i = 0; i < len1; i++) {
            btn1[i] = (Button) findViewById(data1[i]);
            btn1[i].setOnClickListener(this);
            btn1[i].setOnTouchListener(this);
        }
        for (int i = 0; i < len2; i++) {
            btn2[i] = (Button) findViewById(data2[i]);
            btn2[i].setOnClickListener(this);
            btn2[i].setOnTouchListener(this);
        }

    }

    @Override
    public void onClick(View v) {
        int Id = v.getId();
        // v.setBackgroundColor(Color.CYAN);
        switch (Id) {
        case R.id.btn0:
            s.append(btn1[0].getText());
            editText.setText(s);
            break;
        case R.id.btn1:
            s.append(btn1[1].getText());
            editText.setText(s);
            break;
        case R.id.btn2:
            s.append(btn1[2].getText());
            editText.setText(s);
            break;
        case R.id.btn3:
            s.append(btn1[3].getText());
            editText.setText(s);
            break;
        case R.id.btn4:
            s.append(btn1[4].getText());
            editText.setText(s);
            break;
        case R.id.btn5:
            s.append(btn1[5].getText());
            editText.setText(s);
            break;
        case R.id.btn6:
            s.append(btn1[6].getText());
            editText.setText(s);
            break;
        case R.id.btn7:
            s.append(btn1[7].getText());
            editText.setText(s);
            break;
        case R.id.btn8:
            s.append(btn1[8].getText());
            editText.setText(s);
            break;
        case R.id.btn9:
            s.append(btn1[9].getText());
            editText.setText(s);
            break;
        case R.id.backspace:
            try {
                s = new StringBuffer(s.substring(0, s.length() - 1));
                editText.setText(s);

            } catch (Exception e) {
                editText.setText("");
            }
            break;
        case R.id.btnChu:
            temp = "/";
            s.append(btn2[0].getText());
            editText.setText(s);
            break;
        case R.id.btnDian:
            s.append(btn2[1].getText());
            editText.setText(s);
            break;
        case R.id.btnJia:
            temp = "+";
            s.append(btn2[2].getText());
            editText.setText(s);
            break;
        case R.id.btnJian:
            temp = "-";
            s.append(btn2[3].getText());
            editText.setText(s);
            break;
        case R.id.btnRes:
            getRes();
            break;
        case R.id.btnSheng:
            temp = "*";
            s.append(btn2[5].getText());
            editText.setText(s);
            break;
        case R.id.ce:
            editText.setText("");
            s = new StringBuffer();
            break;

        }
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        // v.setBackgroundColor(Color.YELLOW);

        return false;
    }

布局文件：activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_gravity="center" android:background="#404040" android:orientation="vertical" >

    <LinearLayout  android:layout_width="match_parent" android:layout_height="wrap_content" >

        <EditText  android:id="@+id/edit_text" android:layout_width="match_parent" android:layout_height="70dp" android:background="@android:drawable/alert_light_frame" android:focusable="false" android:gravity="right" android:maxLines="1" android:textSize="30sp" />
    </LinearLayout>

    <LinearLayout  android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#404040" android:orientation="horizontal" >

        <Button  android:id="@+id/backspace" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="Backspace" />

        <Button  android:id="@+id/ce" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="CE" />
    </LinearLayout>

    <LinearLayout  android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" >

        <Button  android:id="@+id/btn7" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="7" />

        <Button  android:id="@+id/btn8" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="8" />

        <Button  android:id="@+id/btn9" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="9" />

        <Button  android:id="@+id/btnChu" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="/" />
    </LinearLayout>


    <LinearLayout  android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" >

        <Button  android:id="@+id/btn4" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="4" />

        <Button  android:id="@+id/btn5" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="5" />

        <Button  android:id="@+id/btn6" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="6" />

        <Button  android:id="@+id/btnSheng" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="*" />
    </LinearLayout>

    <LinearLayout  android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" >

        <Button  android:id="@+id/btn1" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="1" />

        <Button  android:id="@+id/btn2" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="2" />

        <Button  android:id="@+id/btn3" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="3" />

        <Button  android:id="@+id/btnJian" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="-" />
    </LinearLayout>

    <LinearLayout  android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" >

        <Button  android:id="@+id/btn0" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="2" android:text="0" />

        <Button  android:id="@+id/btnDian" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="." />

        <Button  android:id="@+id/btnJia" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="+" />
    </LinearLayout>

    <LinearLayout  android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" >

        <Button  android:id="@+id/btnRes" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="=" />
    </LinearLayout>

</LinearLayout>