Android计算器

来源：互联网发布：win7优化系统编辑：程序博客网时间：2024/05/19 04:07

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>

这里写图片描述

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