Android计算器（最初版）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    >
    <TextView
        android:id="@+id/label"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/calculate" />
    <RelativeLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content" >
      <EditText
        android:id="@+id/edit"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/label"
        android:hint="请用户输入"
        ></EditText>
    </RelativeLayout>
    <RelativeLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content" >
      <Button
        android:id="@+id/X7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="15pt"
        android:text="@string/X7"/>
      <Button
        android:id="@+id/X8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/X7"
        android:layout_alignTop="@id/X7"
        android:textSize="15pt"
        android:text="@string/X8"/>
         <Button
        android:id="@+id/X9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
         android:layout_toRightOf="@id/X8"
        android:layout_alignTop="@id/X8"
        android:textSize="15pt"
        android:text="@string/X9"/>
          <Button
        android:id="@+id/Add"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/X9"
        android:layout_alignTop="@id/X9"
        android:textSize="15pt"
        android:text="@string/Add"/>
          <Button
        android:id="@+id/Clear"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/Add"
        android:layout_alignTop="@id/Add"
        android:textSize="15pt"
        android:text="@string/Clear"/>
    </RelativeLayout>
     <RelativeLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content">
       <Button
        android:id="@+id/X4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="15pt"
        android:text="@string/X4"/>
       <Button
        android:id="@+id/X5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/X4"
        android:layout_alignTop="@id/X4"
        android:textSize="15pt"
        android:text="@string/X5"/>
        <Button
        android:id="@+id/X6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/X5"
        android:layout_alignTop="@id/X5"
        android:textSize="15pt"
        android:text="@string/X6"/>
       <Button
        android:id="@+id/Sub"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/X6"
         android:layout_alignTop="@id/X6"
        android:textSize="15pt"
        android:text="@string/Sub"/>
        </RelativeLayout>
        <RelativeLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content" >
         <Button
        android:id="@+id/X1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="15pt"
        android:text="@string/X1"/>
       <Button
        android:id="@+id/X2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
         android:layout_toRightOf="@id/X1"
        android:layout_alignTop="@id/X1"
        android:textSize="15pt"
        android:text="@string/X2"/>
       <Button
        android:id="@+id/X3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
         android:layout_toRightOf="@id/X2"
        android:layout_alignTop="@id/X2"
        android:textSize="15pt"
        android:text="@string/X3"/>
  
   
    <Button
        android:id="@+id/Mult"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/X3"
        android:layout_alignTop="@id/X1"
        android:textSize="15pt"
        android:text="@string/Mult"/>
      </RelativeLayout>
       <RelativeLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content" >
     <Button
        android:id="@+id/Point"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="15pt"
        android:text="@string/Point"/>
     <Button
        android:id="@+id/X0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
         android:layout_toRightOf="@id/Point"
        android:layout_alignTop="@id/Point"
        android:textSize="15pt"
        android:text="@string/X0"/>
     <Button
        android:id="@+id/Calculate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/X0"
        android:layout_alignTop="@id/X0"
        android:textSize="15pt"
        android:text="@string/Calculate"/>
    <Button
        android:id="@+id/Divid"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/Calculate"
         android:layout_alignTop="@id/Calculate"
        android:textSize="15pt"
        android:text="@string/Divid"/>
     </RelativeLayout> 
      
</LinearLayout>

package YY.android.calculate;

import android.app.Activity;
import android.os.Bundle;
import android.text.Selection;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class CalculateActivity extends Activity {
    private Button xAdd;
    private Button xSub;
    private Button xMult;
    private Button xDivid;
    private Button xCalculate;
    private Button xClear;
    private Button xPoint;
    private EditText xedit;
    private Button x1;
    private Button x2;
    private Button x3;
    private Button x4;
    private Button x5;
    private Button x6;
    private Button x7;
    private Button x8;
    private Button x9;
    private Button x0;
    private double result = 0;
    private String flag = "Original";
    private String Get;
    private double one = 0;
 @Override
    public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
     xAdd = (Button)findViewById(R.id.Add);
     xSub = (Button)findViewById(R.id.Sub);
     xMult = (Button)findViewById(R.id.Mult);
     xDivid = (Button)findViewById(R.id.Divid);
     xedit = (EditText)findViewById(R.id.edit);
     xCalculate =(Button)findViewById(R.id.Calculate);
     xClear = (Button)findViewById(R.id.Clear);
     xPoint = (Button)findViewById(R.id.Point);
     x1 = (Button)findViewById(R.id.X1);
     x2 = (Button)findViewById(R.id.X2);
     x3= (Button)findViewById(R.id.X3);
     x4 = (Button)findViewById(R.id.X4);
     x5 = (Button)findViewById(R.id.X5);
     x6 = (Button)findViewById(R.id.X6);
     x7 = (Button)findViewById(R.id.X7);
     x8 = (Button)findViewById(R.id.X8);
     x9= (Button)findViewById(R.id.X9);
     x0 = (Button)findViewById(R.id.X0);
     xAdd.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
       //    Get = xedit.getText().toString();
         //  one =  Double.parseDouble(Get);
           if(flag == "Original"){
              Get = xedit.getText().toString();
              one =  Double.parseDouble(Get);
           result = one;
           xedit.setText("");
           }
           else if(flag == "+"){
           Get = xedit.getText().toString();
           one =  Double.parseDouble(Get);
        result = result + one;
        xedit.setText("");
           }
           else if(flag == "-"){
            Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
            result = result - one;
            xedit.setText("");
           }
           else if(flag == "*"){
            Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
            result = result * one;
            xedit.setText("");
           }
           else{
            Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
            result = result / one;
            xedit.setText("");
           }     
           flag = "+";
   }
  });
      xSub.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
           //Get = xedit.getText().toString();
           //one =  Double.parseDouble(Get);
           if(flag == "Original"){
              Get = xedit.getText().toString();
              one =  Double.parseDouble(Get);
           result = one;
           xedit.setText("");
           }
           else if(flag == "+"){
           Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
        result = result + one;
        xedit.setText("");
           }
           else if(flag == "-"){
            Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
            result = result - one;
            xedit.setText("");
           }
           else if(flag == "*"){
            Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
            result = result * one;
            xedit.setText("");
           }
           else{
            Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
            result = result / one;
            xedit.setText("");
           }     
           flag = "-";
   }
  });
     
     xMult.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
         //  Get = xedit.getText().toString();
           //one =  Double.parseDouble(Get);
           if(flag == "Original"){
              Get = xedit.getText().toString();
              one =  Double.parseDouble(Get);
              result = one;
           xedit.setText("");
           }
           else if(flag == "+"){
           Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
        result = result + one;
        xedit.setText("");
           }
           else if(flag == "-"){
            Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
            result = result - one;
            xedit.setText("");
           }
           else if(flag == "*"){
            Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
            result = result * one;
            xedit.setText("");
           }
           else{
            Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
            result = result / one;
            xedit.setText("");
           }     
           flag = "*";
   }
  });
     xDivid.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
          // Get = xedit.getText().toString();
          // one =  Double.parseDouble(Get);
           if(flag == "Original"){
              Get = xedit.getText().toString();
              one =  Double.parseDouble(Get);
           result = one;
           xedit.setText("");
           }
           else if(flag == "+"){
           Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
        result = result + one;
        xedit.setText("");
           }
           else if(flag == "-"){
            Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
            result = result - one;
            xedit.setText("");
           }
           else if(flag == "*"){
            Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
            result = result * one;
            xedit.setText("");
           }
           else{
            Get = xedit.getText().toString();
            one =  Double.parseDouble(Get);
            result = result / one;
            xedit.setText("");
           }     
           flag = "/";
   }
  });
     xClear.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    xedit.setText(null);
    flag = "Original";
   }
  });
     xCalculate.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    if(flag == "+"){
      Get = xedit.getText().toString();
      one =  Double.parseDouble(Get);
     result = result + one;
     xedit.setText(result+"");
     result = 0;
     flag = "Original";
    }
    else if(flag == "-"){
      Get = xedit.getText().toString();
      one =  Double.parseDouble(Get);
     result = result - one;
     xedit.setText(result+"");
     result = 0;
     flag = "Original";
    }
    else if(flag == "*"){
      Get = xedit.getText().toString();
       one =  Double.parseDouble(Get);
     result = result * one;
     xedit.setText(result+"");
     result = 0;
     flag = "Original";
    }
    else if(flag == "/"){
        Get = xedit.getText().toString();
      one =  Double.parseDouble(Get);
     result = result / one;
     xedit.setText(result+"");
     result = 0;
     flag = "Original";
    }
   }
  });
      xPoint.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
      // if(null == xedit.getText().toString())
       if(null == xedit.getText()){
        xedit.setText("第一个一定要是数字");
       }
         else{
         Get = xedit.getText().toString();
        xedit.setText(Get+".");
        xedit.setSelection(Get.length()+1);
        }
     }
  });
      x1.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
      //if(null == xedit.getText().toString())
      if(null == xedit.getText()){
        xedit.setText("1");
      }
        else{
         Get = xedit.getText().toString();
        xedit.setText(Get+"1");
        xedit.setSelection(Get.length()+1);
       }
     }
   });
      x2.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
      //if(null == xedit.getText().toString())
      if(null == xedit.getText()){
        xedit.setText("2");
      }
        else{
         Get = xedit.getText().toString();
        xedit.setText(Get+"2");
        xedit.setSelection(Get.length()+1);
       }
     }
    });
       x3.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
       //if(null == xedit.getText().toString())
       if(null == xedit.getText()){
         xedit.setText("3");
       }
         else{
          Get = xedit.getText().toString();
         xedit.setText(Get+"3");
         xedit.setSelection(Get.length()+1);
        }
      }
    });
      x4.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
       //if(null == xedit.getText().toString())
       if(null == xedit.getText()){
         xedit.setText("4");
       }
         else{
          Get = xedit.getText().toString();
         xedit.setText(Get+"4");
         xedit.setSelection(Get.length()+1);
        }
      }
    });
      x5.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
       //if(null == xedit.getText().toString())
       if(null == xedit.getText()){
         xedit.setText("5");
       }
         else{
          Get = xedit.getText().toString();
         xedit.setText(Get+"5");
         xedit.setSelection(Get.length()+1);
        }
      }
    });
      x6.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
       //if(null == xedit.getText().toString())
       if(null == xedit.getText()){
         xedit.setText("6");
       }
         else{
          Get = xedit.getText().toString();
         xedit.setText(Get+"6");
         xedit.setSelection(Get.length()+1);
        }
      }
    });
      x7.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
       //if(null == xedit.getText().toString())
       if(null == xedit.getText()){
         xedit.setText("7");
       }
         else{
          Get = xedit.getText().toString();
         xedit.setText(Get+"7");
         xedit.setSelection(Get.length()+1);
        }
      }
    });
      x8.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
       //if(null == xedit.getText().toString())
       if(null == xedit.getText()){
         xedit.setText("8");
       }
         else{
          Get = xedit.getText().toString();
         xedit.setText(Get+"8");
         xedit.setSelection(Get.length()+1);
        }
      }
    });
      x9.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
       //if(null == xedit.getText().toString())
       if(null == xedit.getText()){
         xedit.setText("9");
       }
         else{
          Get = xedit.getText().toString();
         xedit.setText(Get+"9");
         xedit.setSelection(Get.length()+1);
        }
      }
    });
      x0.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
       //if(null == xedit.getText().toString())
       if(null == xedit.getText()){
         xedit.setText("0");
       }
         else{
          Get = xedit.getText().toString();
         xedit.setText(Get+"0");
         xedit.setSelection(Get.length()+1);
        }
      }
    });
    }
}