计算机1

来源：互联网发布：centos 集成环境编辑：程序博客网时间：2024/06/06 10:04
package com.he;import android.app.Activity;import android.os.Bundle;import android.text.InputType;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class CalculatorActivity extends Activity {//加plus     减subtract       乘multiply     除divideprivate EditText etResult;private Button btPlus;private Button btSub;private Button btMultiply;private Button btDivide;private Button btDelete;private Button btCe;private Button btPoint;private Button btDeng;private Button bt0;private Button bt1;private Button bt2;private Button bt3;private Button bt4;private Button bt5;private Button bt6;private Button bt7;private Button bt8;private Button bt9;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        etResult=(EditText)findViewById(R.id.etResult);        btPlus=(Button)findViewById(R.id.btPlus);        btSub=(Button)findViewById(R.id.btSubtract);        btMultiply=(Button)findViewById(R.id.btMultiply);        btDivide=(Button)findViewById(R.id.btDivide);        btDelete=(Button)findViewById(R.id.btDelete);        btDeng=(Button)findViewById(R.id.btDeng);        btPoint=(Button)findViewById(R.id.btPoint);        btCe=(Button)findViewById(R.id.btCe);        bt0=(Button)findViewById(R.id.bt0);        bt1=(Button)findViewById(R.id.bt1);        bt2=(Button)findViewById(R.id.bt2);        bt3=(Button)findViewById(R.id.bt3);        bt4=(Button)findViewById(R.id.bt4);        bt5=(Button)findViewById(R.id.bt5);        bt6=(Button)findViewById(R.id.bt6);        bt7=(Button)findViewById(R.id.bt7);        bt8=(Button)findViewById(R.id.bt8);        bt9=(Button)findViewById(R.id.bt9);                etResult.setInputType(InputType.TYPE_NULL);                /*         * .按钮         */                btPoint.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str1=etResult.getText().toString();if(str1.equals("")){etResult.setText("");}else{etResult.setText(str1+btPoint.getText().toString());}}});                        /*         * 0---------9的数字按钮         */        bt0.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str1=etResult.getText().toString();if(str1.equals("")){etResult.setText("");}else{etResult.setText(str1+bt0.getText().toString());}}});                bt1.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str1=etResult.getText().toString();etResult.setText(str1+bt1.getText().toString());}});                bt2.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str1=etResult.getText().toString();etResult.setText(str1+bt2.getText().toString());}});                bt3.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str1=etResult.getText().toString();etResult.setText(str1+bt3.getText().toString());}});                bt4.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str1=etResult.getText().toString();etResult.setText(str1+bt4.getText().toString());}});                bt5.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str1=etResult.getText().toString();etResult.setText(str1+bt5.getText().toString());}});                bt6.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str1=etResult.getText().toString();etResult.setText(str1+bt6.getText().toString());}});                bt7.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str1=etResult.getText().toString();etResult.setText(str1+bt7.getText().toString());}});                bt8.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str1=etResult.getText().toString();etResult.setText(str1+bt8.getText().toString());}});                bt9.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str1=etResult.getText().toString();etResult.setText(str1+bt9.getText().toString());}});                /*         * ce键    清空         */        btCe.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {etResult.setText("");}});                /*         * Delete键           */        btDelete.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str=etResult.getText().toString();if(str.length()==0){etResult.setText("");}else{etResult.setText(str.subSequence(0, str.length()-1));}}});                /*         * + 、-、 *  、/四个按钮         */        btPlus.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {final String str=etResult.getText().toString();if(str.equals("")){etResult.setText("");}else{etResult.setText(str+btPlus.getText().toString());}}});                btSub.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str=etResult.getText().toString();if(str.equals("")){etResult.setText("");}else{etResult.setText(str+btSub.getText().toString());}}});                btMultiply.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str=etResult.getText().toString();if(str.equals("")){etResult.setText("");}else{etResult.setText(str+btMultiply.getText().toString());}}});                btDivide.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str=etResult.getText().toString();if(str.equals("")){etResult.setText("");}else{etResult.setText(str+btDivide.getText().toString());}}});                        /*         * = 按钮         */        btDeng.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {String str=etResult.getText().toString();/*if(str.charAt(str.length()-1)=='0' && str.charAt(str.length()-2)=='/'){Toast.makeText(CalculatorActivity.this, "除数不能为0！", Toast.LENGTH_LONG).show();}else{}*/if(str.indexOf('+')>0){Double num1=Double.parseDouble(str.substring(0, str.indexOf('+')));Double num2=Double.parseDouble(str.substring(str.indexOf('+')+1));Double result=num1+num2;etResult.setText(result.toString());}else if(str.indexOf('-')>0){Double num1=Double.parseDouble(str.substring(0, str.indexOf('-')));Double num2=Double.parseDouble(str.substring(str.indexOf('-')+1));Double result=num1-num2;etResult.setText(result.toString());}else if(str.indexOf('*')>0){Double num1=Double.parseDouble(str.substring(0, str.indexOf('*')));Double num2=Double.parseDouble(str.substring(str.indexOf('*')+1));Double result=num1*num2;etResult.setText(result.toString());}else if(str.indexOf('/')>0){Double num1=Double.parseDouble(str.substring(0, str.indexOf('/')));Double num2=Double.parseDouble(str.substring(str.indexOf('/')+1));if(num2==0){Toast.makeText(CalculatorActivity.this, "除数不能为0！", Toast.LENGTH_LONG).show();}else{Double result=num1/num2;etResult.setText(result.toString());}}}});    }}
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