android

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从大二上快结束时接触android，此处留言一计算器代码：
这是活动的java文件，至于他的XML文件，大家可以自由发挥，只要按钮的id可以对应上，就可以
package com.example.administrator.test;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.view.View.OnClickListener;import android.widget.TextView;import java.lang.String;import java.math.*;public class MainActivity extends AppCompatActivity implements OnClickListener {    //按钮声明    TextView text1 = null;    TextView text2 =null;    Button button_0 = null;    Button button_1 = null;    Button button_2 = null;    Button button_3 = null;    Button button_4 = null;    Button button_5 = null;    Button button_6 = null;    Button button_7 = null;    Button button_8 = null;    Button button_9 = null;    Button button_ce = null;    Button button_c = null;    Button button_div = null;    Button button_mul = null;    Button button_sub = null;    Button button_add = null;    Button button_rel = null;    Button button_point = null;    Button button_equal = null;    int op = 0;//操作符    String str = "";    BigDecimal num = BigDecimal.ZERO,ans = BigDecimal.ZERO;    boolean is_op = false;    boolean is_num = false;    boolean rel = false;    boolean equal = false;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.first_layout);        //获取id        text1 = (TextView) findViewById(R.id.text1);        text2 = (TextView)findViewById(R.id.text2);        button_0 = (Button) findViewById(R.id.button_0);        button_1 = (Button) findViewById(R.id.button_1);        button_2 = (Button) findViewById(R.id.button_2);        button_3 = (Button) findViewById(R.id.button_3);        button_4 = (Button) findViewById(R.id.button_4);        button_5 = (Button) findViewById(R.id.button_5);        button_6 = (Button) findViewById(R.id.button_6);        button_7 = (Button) findViewById(R.id.button_7);        button_8 = (Button) findViewById(R.id.button_8);        button_9 = (Button) findViewById(R.id.button_9);        button_ce = (Button) findViewById(R.id.button_ce);        button_c = (Button) findViewById(R.id.button_c);        button_div = (Button) findViewById(R.id.button_div);        button_mul = (Button) findViewById(R.id.button_mul);        button_sub = (Button) findViewById(R.id.button_sub);        button_add = (Button) findViewById(R.id.button_add);        button_rel = (Button)findViewById(R.id.button_rel);        button_point = (Button) findViewById(R.id.button_point);        button_equal = (Button) findViewById(R.id.button_equal);        //添加监听        button_0.setOnClickListener(this);        button_1.setOnClickListener(this);        button_2.setOnClickListener(this);        button_3.setOnClickListener(this);        button_4.setOnClickListener(this);        button_5.setOnClickListener(this);        button_6.setOnClickListener(this);        button_7.setOnClickListener(this);        button_8.setOnClickListener(this);        button_9.setOnClickListener(this);        button_ce.setOnClickListener(this);        button_c.setOnClickListener(this);        button_div.setOnClickListener(this);        button_mul.setOnClickListener(this);        button_sub.setOnClickListener(this);        button_add.setOnClickListener(this);        button_point.setOnClickListener(this);        button_rel.setOnClickListener(this);        button_equal.setOnClickListener(this);        text1.setOnClickListener(this);        text2.setOnClickListener(this);    }    public void onClick(View v){        switch(v.getId()){            case R.id.button_0:                str += 0;                is_num = true;                is_op = false;                break;            case R.id.button_1:                str += "1";                is_num = true;                is_op = false;                break;            case R.id.button_2:                str += "2";                is_num = true;                is_op = false;                break;            case R.id.button_3:                str += "3";                is_num = true;                is_op = false;                break;            case R.id.button_4:                str += "4";                is_num = true;                is_op = false;                break;            case R.id.button_5:                str += "5";                is_num = true;                is_op = false;                break;            case R.id.button_6:                str += "6";                is_num = true;                is_op = false;                break;            case R.id.button_7:                str += "7";                is_num = true;                is_op = false;                break;            case R.id.button_8:                str += "8";                is_num = true;                is_op = false;                break;            case R.id.button_9:                str += "9";                is_num = true;                is_op = false;                break;            case R.id.button_point:                str += ".";                is_num = true;                is_op = false;                break;            case R.id.button_add:                if(op!=0)                    return;                op = 1;                str += "+";                is_op = true;                is_num = false;                break;            case R.id.button_sub:                if(op!=0){                    return;                }                op = 2;                str += "-";                is_op = true;                is_num = false;                break;            case R.id.button_mul:                if(op!=0){                    return;                }                op = 3;                str += "*";                is_op = true;                is_num = false;                break;            case R.id.button_div:                if(op!=0){                    return;                }                op = 4;                str += "/";                is_op = true;                is_num = false;                break;            case R.id.button_ce:                op = 0;                text1.setText("");                str = "";                ans = BigDecimal.ZERO;                num = BigDecimal.ZERO;                break;            case R.id.button_c:                str = "";                num = BigDecimal.ZERO;                break;            case R.id.button_rel:                rel = true;                break;            case R.id.button_equal:                if(num.equals(BigDecimal.ZERO)){                    num = new BigDecimal(str);                 }                switch(op) {                    case 0:                        return;                    case 1:                        ans = ans.add(num);                        break;                    case 2:                        ans = ans.subtract(num);                        break;                    case 3:                        ans = ans.multiply(num);                        break;                    case 4:                        ans = ans.divide(num,3,4);                        break;                    default:                        return;                }                op = 0;                is_num = false;                is_op = false;                equal = true;                num = BigDecimal.ZERO;                text1.setText("");                str = String.valueOf(ans);                break;            default:                break;        }        //首轮计算 等于号问题        if(equal&&is_num){            int len = str.length();            ans = BigDecimal.ZERO;            str = str.substring(len-1,len);            equal = false;        }        //第二次计算        if(is_op&&(!ans.equals(BigDecimal.ZERO))){           // str = ans.toString()+str;            text1.setText(str);            str = "";            equal = false;        }        //第一次遇到操作数        if(is_op&&(ans.equals(BigDecimal.ZERO))){            String temp;            text1.setText(str);            int len = str.length();            if(num.equals(BigDecimal.ZERO)) {                temp = str.substring(0, len - 1);                num  = new BigDecimal(temp);                ans = num;                num = BigDecimal.ZERO;            }            str = "";        }        //正负号处理的部分        if(rel){            num = new BigDecimal(str);            if(op==0){                num = num.negate();                ans = num;                str = num.toString();                num = BigDecimal.ZERO;            }            else{                num = num.negate();                str = num.toString();            }            rel = false;        }        text2.setText(str);        }    }
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