package com.jmi.Jisuanqi;
import java.text.DecimalFormat;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
	private Button btn_1, btn_2, btn_3, btn_4, btn_5, btn_6, btn_7, btn_8,  
    btn_9, btn_0, btn_jia, btn_jian, btn_dengyu, btn_clear, btn_chuyi,  
    btn_chengyi, btn_dian; //各个按钮  
private EditText et_show; //显示输入数字和结果  
public int flag = 0;  //为判断是加减乘除四种运算中的哪一种设定的标志位  
private String text1 = "0",  //获得输入的第一个数  
    text2 = "0";         //获得输入的第二个数  

@Override  
protected void onCreate(Bundle savedInstanceState) {  
super.onCreate(savedInstanceState);  
setContentView(R.layout.main);  
setTitle("计算器");  
//获得各个控件  
et_show = (EditText) findViewById(R.id.et_show);  
btn_0 = (Button) findViewById(R.id.btn_0);  
btn_1 = (Button) findViewById(R.id.btn_1);  
btn_2 = (Button) findViewById(R.id.btn_2);  
btn_3 = (Button) findViewById(R.id.btn_3);  
btn_4 = (Button) findViewById(R.id.btn_4);  
btn_5 = (Button) findViewById(R.id.btn_5);  
btn_6 = (Button) findViewById(R.id.btn_6);  
btn_7 = (Button) findViewById(R.id.btn_7);  
btn_8 = (Button) findViewById(R.id.btn_8);  
btn_9 = (Button) findViewById(R.id.btn_9);  
btn_jia = (Button) findViewById(R.id.btn_jia);  
btn_jian = (Button) findViewById(R.id.btn_jian);  
btn_chengyi = (Button) findViewById(R.id.btn_chengyi);  
btn_chuyi = (Button) findViewById(R.id.btn_chuyi);  
btn_dengyu = (Button) findViewById(R.id.btn_dengyu);  
btn_clear = (Button) findViewById(R.id.btn_clear);  
btn_dian = (Button) findViewById(R.id.btn_dian);  
//设置监听器  
/*
btn_0.setOnClickListener((OnClickListener) this);  
btn_1.setOnClickListener((OnClickListener) this);  
btn_2.setOnClickListener((OnClickListener) this);  
btn_3.setOnClickListener((OnClickListener) this);  
btn_4.setOnClickListener((OnClickListener) this);  
btn_5.setOnClickListener((OnClickListener) this);  
btn_6.setOnClickListener((OnClickListener) this);  
btn_7.setOnClickListener((OnClickListener) this);  
btn_8.setOnClickListener((OnClickListener) this);  
btn_9.setOnClickListener((OnClickListener) this);  
btn_clear.setOnClickListener((OnClickListener) this);  
btn_jia.setOnClickListener((OnClickListener) this);  
btn_jian.setOnClickListener((OnClickListener) this);  
btn_chengyi.setOnClickListener((OnClickListener) this);  
btn_chuyi.setOnClickListener((OnClickListener) this);  
btn_dian.setOnClickListener((OnClickListener) this);  
btn_dengyu.setOnClickListener((OnClickListener) this);  
*/
}  

public void onClick(View arg0) {  
// TODO Auto-generated method stub  
switch (arg0.getId()) {  
case R.id.btn_0:  
    et_show.append("0");  
    break;  
case R.id.btn_1:  
    et_show.append("1");  
    break;  
case R.id.btn_2:  
    et_show.append("2");  
    break;  
case R.id.btn_3:  
    et_show.append("3");  
    break;  
case R.id.btn_4:  
    et_show.append("4");  
    break;  
case R.id.btn_5:  
    et_show.append("5");  
    break;  
case R.id.btn_6:  
    et_show.append("6");  
    break;  
case R.id.btn_7:  
    et_show.append("7");  
    break;  
case R.id.btn_8:  
    et_show.append("8");  
    break;  
case R.id.btn_9:  
    et_show.append("9");  
    break;  

case R.id.btn_dian:  
    et_show.append(".");  
    break;  
case R.id.btn_jia:  
	
    flag = 1;  
    text1 = et_show.getText().toString();  
    et_show.setText("");  
    break;  
case R.id.btn_jian:  
	
    flag = 2;  
    text1 = et_show.getText().toString();  
    et_show.setText("");  

    break;  
case R.id.btn_chengyi:  
	
    flag = 3;  
    text1 = et_show.getText().toString();  
    et_show.setText("");  

    break;  
case R.id.btn_chuyi:  
    flag = 4;  
    text1 = et_show.getText().toString();  
    et_show.setText("");  

    break;  
case R.id.btn_dengyu: 
	
    switch (flag) {  
    case 0:  
        // et_show.setText(text1);  
        et_show.append("0");  
        Log.d("text1", text1);  
        Log.d("text2", text2);  
        break;  
    case 1:  
        text2 = et_show.getText().toString();  
        Double res = Double.parseDouble(text1)  
                + Double.parseDouble(text2);  
        // et_show.setText("flag=1");  
        CharSequence r = res.toString();  
        DecimalFormat df = new DecimalFormat("#.00");
        String stres = df.format(res);
        
        et_show.setText(stres + "");  
        Log.d("text1", text1);  
        Log.d("text2", text2);  
        Log.d("res", res.toString());  
        break;  
    case 2:  
        text2 = et_show.getText().toString();  
        Double res2 = (Double.parseDouble(text1) - Double  
                .parseDouble(text2));  
        CharSequence r2 = res2.toString();  
        DecimalFormat df2 = new DecimalFormat("#.00");
        String stres2 = df2.format(res2);
        et_show.setText(stres2 + "");  
        Log.d("text1", text1);  
        Log.d("text2", text2);  
        Log.d("res", res2.toString());  
        // et_show.setText("flag=2");  
        break;  
    case 3:  

        text2 = et_show.getText().toString();  
        Double res3 = Double.parseDouble(text1)  
                * Double.parseDouble(text2);  
        // et_show.setText("flag=3");  
        CharSequence r3 = res3.toString();   
        DecimalFormat df3 = new DecimalFormat("#.00");
        String stres3 = df3.format(res3);
        et_show.setText(stres3 + "");  
        Log.d("text1", text1);  
        Log.d("text2", text2);  
        Log.d("res", res3.toString());  
        break;  
    case 4:  
        text2 = et_show.getText().toString();  
        Double res4 = Double.parseDouble(text1)  
                / Double.parseDouble(text2);  
        // et_show.setText("flag=4");  
        CharSequence r4 = res4.toString();  
        DecimalFormat df4 = new DecimalFormat("#.00");
        String stres4 = df4.format(res4);
        et_show.setText(stres4 + "");  
        Log.d("text1", text1);  
        Log.d("text2", text2);  
        Log.d("res", res4.toString());  
        break;  

    default:  
        break;  
    }  
    break;  
case R.id.btn_clear:  
    flag = 0;  
    text1 = "0";  
    text2 = "0";  
    et_show.setText("");  
    break;  
default:  
    break;  
}  
}  

}