小学四则运算APP 第二阶段冲刺

第一阶段实现最基本的四则运算计算，最原始的所以还没有美化

xml文件

 

 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity" 

    android:orientation="vertical">

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    tools:context=".MainActivity"

    android:orientation="horizontal">

    

        <EditText 

        android:id="@+id/num1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:textSize="12px"

        android:text="请输入第一个数字"/>

        

        <TextView 

            android:id="@+id/tips"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:text=""/>

        

        <EditText 

        android:id="@+id/num2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:textSize="12px"

        android:text="请输入第二个数字"/>

        

        <TextView 

            android:id="@+id/txt"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:text="="/>

        

        <TextView 

            android:id="@+id/result"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:textSize="12px"

         android:text="计算结果"/>

        

    </LinearLayout>

    

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    tools:context=".MainActivity"

    android:orientation="horizontal">

    

    <Button 

        android:id="@+id/add"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="+"/>

    

    <Button 

        android:id="@+id/sub"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="-"/>

    

    <Button 

        android:id="@+id/mul"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="*"/>

    

    <Button 

        android:id="@+id/div"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="/"/>

    

</LinearLayout>

 

</LinearLayout>

 

.java文件

 

public class MainActivity extends Activity {

private EditText num1=null;

private EditText num2=null;

private TextView result=null;

//表示的是符号

private TextView tips=null;

private Button butAdd=null;

private Button butSub=null;

private Button butMul=null;

private Button butDiv=null;

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

this.num1=(EditText)super.findViewById(R.id.num1);

this.num2=(EditText)super.findViewById(R.id.num2);

this.result=(TextView)super.findViewById(R.id.result);

this.tips=(TextView)super.findViewById(R.id.tips);

this.butAdd=(Button)super.findViewById(R.id.add);

this.butSub=(Button)super.findViewById(R.id.sub);

this.butMul=(Button)super.findViewById(R.id.mul);

this.butDiv=(Button)super.findViewById(R.id.div);

//增加监听

this.butAdd.setOnClickListener(new AddListener());

this.butSub.setOnClickListener(new SubListener());

this.butMul.setOnClickListener(new MulListener());

this.butDiv.setOnClickListener(new DivListener());

this.num1.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

MainActivity.this.num1.setText("");

}

});

this.num2.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

MainActivity.this.num2.setText("");

}

});

}

 

//加法操作 

public class AddListener implements OnClickListener{

int onenum=0;

int twonum=0;

public void onClick(View v) {

onenum=Integer.parseInt(MainActivity.this.num1.getText().toString());

twonum=Integer.parseInt(MainActivity.this.num2.getText().toString());

MainActivity.this.tips.setText("+");

MainActivity.this.result.setText((onenum+twonum)+"");

}

}

 

//减法操作 

public class SubListener implements OnClickListener{

int onenum=0;

int twonum=0;

public void onClick(View v) {

onenum=Integer.parseInt(MainActivity.this.num1.getText().toString());

twonum=Integer.parseInt(MainActivity.this.num2.getText().toString());

MainActivity.this.tips.setText("-");

MainActivity.this.result.setText((onenum-twonum)+"");

}

}

//乘法操作 

public class MulListener implements OnClickListener{

int onenum=0;

int twonum=0;

public void onClick(View v) {

onenum=Integer.parseInt(MainActivity.this.num1.getText().toString());

twonum=Integer.parseInt(MainActivity.this.num2.getText().toString());

MainActivity.this.tips.setText("*");

MainActivity.this.result.setText((onenum*twonum)+"");

}

}

//除法操作 

public class DivListener implements OnClickListener{

int onenum=0;

int twonum=0;

public void onClick(View v) {

onenum=Integer.parseInt(MainActivity.this.num1.getText().toString());

twonum=Integer.parseInt(MainActivity.this.num2.getText().toString());

MainActivity.this.tips.setText("/");

MainActivity.this.result.setText((onenum/twonum)+"");

}

}

}