Android：为控件绑定监听器

为控件绑定监听器主要分为以下步骤：

1、获取代表控件的对象
2、定义一个类，实现监听器接口
3、生成监听器对象
4、为控件绑定监听器对象

实例：Button按钮----监听器OnClickListener

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="#ff0000"
        android:text="I am one"
        />

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="button"/>

....
 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       textView =(TextView)findViewById(R.id.textView);
       textView.setText("set text success");
       //获取代表控件的对象
       button =(Button)findViewById(R.id.button);
       //生成监听器对象
       ButtonListener buttonListener =new ButtonListener();
       //为控件绑定监听器对象
       button.setOnClickListener(buttonListener);
    }

        //定义监听类，实现监听器接口
 class ButtonListener implements OnClickListener{

    @Override
    public void onClick(View arg0) {
        // TODO Auto-generated method stub
         textView.setText("onclick ok");
    }

 }

实例： CheckBox复选框----监听器OnCheckedChangeListener

<CheckBox
     android:id="@+id/eat"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="吃饭"
    />

  ....
　　protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.linelayout);
      //获取代表控件的对象
        eatbox = (CheckBox)findViewById(R.id.eat);
      //生成监听器对象
        CheckBoxListener checkBoxListener = new CheckBoxListener();
       //为控件绑定监听器对象
        eatbox.setOnCheckedChangeListener(checkBoxListener);
    }
    
　　　　//定义监听类，实现监听器接口
    class CheckBoxListener implements OnCheckedChangeListener{

        @Override
        public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
            //第一参数为CheckBox对象，第二参数为是否选中
            if(arg0.getId()==R.id.eat){
                System.out.println("eat");
            }
            if(arg1){
                System.out.println("oncheck");
            }
        }

    }

 实例：Radio 单选按钮  ----监听器OnCheckedChangeListener

<RadioGroup
        android:id="@+id/sex"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <RadioButton
            android:id="@+id/femal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="女"
            />
              <RadioButton
            android:id="@+id/mal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="男"
            />
    </RadioGroup>

...
private RadioGroup radioGroup;
private RadioButton radiofemal;
private RadioButton radiomal;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

      //获取代表控件的对象
        radioGroup = (RadioGroup)findViewById(R.id.radioGroup);
        radiofemal = (RadioButton)findViewById(R.id.radiofemal);
        radiomal = (RadioButton)findViewById(R.id.radiomal);

      //生成监听器对象
        RadioGroupListener listener = new RadioGroupListener();
      //为控件绑定监听器对象
        radioGroup.setOnCheckedChangeListener(listener);
    }

    //定义监听类，实现监听器接口
    class RadioGroupListener implements OnCheckedChangeListener{

        @Override
        public void onCheckedChanged(RadioGroup arg0, int arg1) {
            // 参数一：哪个radiogroup，第二个哪个radiobutton
            if(arg1 == radiofemal.getId()){
                System.out.println("选择了femal");
            }else{
                System.out.println("选择了mal");
            }
        }

    }

OnCheckedChangeListener在两个包内都有，使用的时候需要注意下，

android.widget.RadioGroup.OnCheckedChangeListener;

    class RadioGroupListener implements OnCheckedChangeListener{

        @Override
        public void onCheckedChanged(RadioGroup arg0, int arg1) {
            // TODO Auto-generated method stub

        }    

    }

android.widget.CompoundButton.OnCheckedChangeListener;

    class RadioButtonListener implements android.widget.CompoundButton.OnCheckedChangeListener{

        @Override
        public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
            // TODO Auto-generated method stub

        }

    }