android 按钮点击事件

<RelativeLayout 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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.phonecall.MainActivity" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:inputType="phone" >

    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText1"
        android:layout_below="@+id/editText1"
        android:layout_marginTop="17dp"
        android:text="@string/dail" />

</RelativeLayout>

   @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //找到button按钮
        Button btn = (Button)this.findViewById(R.id.button1);
        //对按钮监听点击事件
        btn.setOnClickListener(new CallListener());
        
    }
    
    public class CallListener implements OnClickListener
    {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            //找text文本
            EditText edit = (EditText)MainActivity.this.findViewById(R.id.editText1);
            //得到text文本中的内容
            String number = edit.getText().toString();
            
            //翻译为意图 
            Intent intent = new Intent();
            //对intent设置对应的action
            intent.setAction(Intent.ACTION_CALL);
            //打电话
            intent.setData(Uri.parse("tel:"+number));
            
            startActivity(intent);
            
        }
        
        
    }