从零开始学android开发-View的setOnClickListener的添加方法

1)第一种,也是最长见的添加方法(一下都以Button为例)

Button btn = (Button) findViewById(R.id.myButton);
 btn .setOnClickListener(new View.OnClickListener() {
         public void onClick(View v) {
 //do something
         }
     });

2)第二种,下面这个方法较前一种稍微简单了一些,允许多个Buttons共享一个Listener。通过Switch控制对不同Button Click事件的响应方法:

Button btn = (Button) findViewById(R.id.mybutton);
Button btn2 = (Button) findViewById(R.id.mybutton2);
btn.setOnClickListener(handler);
btn2.setOnClickListener(handler);
View.OnClickListener handler = View.OnClickListener() {
        public void onClick(View v) {
            switch (v.getId()) {
               case R.id.mybutton: 
//do something
               break;
               case R.id.mybutton2: 
//do something
               break;
            }
    }

或者

    Button list=null;
    Button about=null;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.main);
        list=(Button)findViewById(R.id.foodlistbtn);
        about=(Button)findViewById(R.id.aboutbutton);
//        list.setText(text);
//        list.setCompoundDrawables(left, top, right, bottom);
        list.setOnClickListener(this);
        about.setOnClickListener(this);
        
    }
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        if(v.getId()==R.id.foodlistbtn){
        Intent intent=new Intent();
        intent.setClass(MainApp.this, FoodListView.class);
        startActivity(intent);
        list.setBackgroundResource(R.drawable.btn_food_list_active);
        }else if(v.getId()==R.id.aboutbutton){
            Intent intent=new Intent(this, About.class);
            startActivity(intent);
            about.setBackgroundResource(R.drawable.btn_food_about_active);
        }
    }

3)第三种,直接将Clicklistener捆绑XML layout中的Views元素,在程序中定义的Listener方法需要带有一个View类型的参数:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:id="@+id/text"
        android:text="@string/hello" />
    <Button android:id="@+id/mybutton" android:layout_height="wrap_content"
        android:layout_width="wrap_content" android:onClick="mybuttonlistener"></Button>
</LinearLayout>

java代码:

 Button btn = (Button) findViewById(R.id.mybutton);
 
 public void mybuttonlistener(View target){
 //do something
     }

 

posted @ 2015-02-13 13:29  dekevin  阅读(695)  评论(0编辑  收藏  举报