Android布局

//页面布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
  android:orientation="vertical"
>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="数字1"
        android:layout_marginLeft="10sp"
        android:layout_marginTop="10sp"
        />
   
    <EditText
        android:id="@+id/num1"
        android:inputType="number"
        android:layout_width="240sp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10sp"
        android:layout_marginTop="10sp"
       
        />
   
      <TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="数字2"
       android:layout_marginLeft="10sp"
       android:layout_marginTop="20sp"
       />
   
    <EditText
        android:id="@+id/num2"
        android:inputType="number"
        android:layout_width="240sp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10sp"
        android:layout_marginTop="15sp"
       
        />
   
    <RadioGroup
        android:id="@+id/rg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginTop="5sp"
        android:layout_marginLeft="10sp"
        >
       
        <RadioButton
            android:id="@+id/jia"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="加"
            />
       
        <RadioButton
            android:id="@+id/jian"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="减"
            />
       
        <RadioButton
            android:id="@+id/cheng"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="乘"
            />
       
        <RadioButton
            android:id="@+id/chu"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="除"
            />
       
    </RadioGroup>
   
    <Button
        android:id="@+id/btncomput"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="计算"
        android:textSize="12sp"
        android:layout_marginLeft="10sp"
        android:layout_marginTop="10sp"
        />
   
   
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="计算结果"
        android:layout_marginLeft="10sp"
        android:layout_marginTop="15sp"
        />

    <EditText
        android:id="@+id/result"
        android:inputType="number"
        android:layout_width="240sp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10sp"
        android:layout_marginTop="10sp"
        />
   


</LinearLayout>


//加页面代码
public class MainActivity extends Activity {
//定义变量
private EditText et1,et2,etRes;
private Button btn;
int results;
private RadioGroup group;
private RadioButton r1,r2,r3,r4;
 
    private int num1;
    private int num2;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        //获得ID
        et1 = (EditText) findViewById(R.id.num1);
        et2 = (EditText) findViewById(R.id.num2);
        etRes = (EditText) findViewById(R.id.result);
        btn = (Button) findViewById(R.id.btncomput);
     
       
        group = (RadioGroup) findViewById(R.id.rg);
        r1 = (RadioButton) findViewById(R.id.jia);
        r2 = (RadioButton) findViewById(R.id.jian);
        r3 = (RadioButton) findViewById(R.id.cheng);
        r4 = (RadioButton) findViewById(R.id.chu);
       
      
       
        group.setOnCheckedChangeListener(new OnCheckedChangeListener() {

@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
num1 = Integer.parseInt(et1.getText().toString());
     num2 = Integer.parseInt(et2.getText().toString());

switch(checkedId)
{
case R.id.jia:
results = num1+num2;
break;
case R.id.jian:
results = num1-num2;
break;
case R.id.cheng:
results = num1*num2;
break;
case R.id.chu:
results = num1/num2;
break;
}



}
});
    
       
        //监听Button按钮
        btn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//btn = (Button) v;
//int results = Integer.parseInt(etRes.getText().toString());
etRes.setText(results);
Toast.makeText(MainActivity.this, etRes.getText().toString(), Toast.LENGTH_LONG).show();
//Toast.makeText(MainActivity.this, etRes.setText(results), Toast.LENGTH_LONG).show();
}
} );
     

     
   
    }