Android按钮单击事件的五种实现方式

1. 匿名内部类作为事件监听器

   public class MainActivity extends Activity {
   	
   	private Button button;
       
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
           button = (Button) findViewById(R.id.button1);
           button.setOnClickListener(new OnClickListener() {
   			@Override
   			public void onClick(View v) {
   				System.out.println("匿名内部类作为事件监听器");
   			}
   		});
           
       }
       
   }
   

2. 内部类作为事件监听器

   public class MainActivity extends Activity {
   	
   	private Button button;
   	
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
           button = (Button) findViewById(R.id.button1);
           button.setOnClickListener(new ButtonOnClickListener());
       }
       
       class ButtonOnClickListener implements OnClickListener{
   		@Override
   		public void onClick(View v) {
   			System.out.println("内部类作为事件监听器");
   		}
       }
       
   }
   

3. Activity本身作为事件监听器

   public class MainActivity extends Activity implements OnClickListener{
   	
   	private Button button;
   	
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
           button = (Button) findViewById(R.id.button1);
           button.setOnClickListener(this);
       }
       
       @Override
       public void onClick(View v) {
       	System.out.println("Activity本身作为事件监听器");
       }
       
   }
   

4. 外部类作为事件监听器

   public class MainActivity extends Activity {
   	
   	private Button button;
   	
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
           button = (Button) findViewById(R.id.button1);
           button.setOnClickListener(new ButtonOnClickListener());
       }
       
   }
   class ButtonOnClickListener implements OnClickListener {
   	
   	@Override
   	public void onClick(View v) {
   		System.out.println("外部类作为事件监听器");
   	}
   	
   }
   

5. 将事件处理方法直接绑定到标签

   <Button
               android:id="@+id/button1"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:text="点击事件"
               android:onClick="onClick" />
   

   public class MainActivity extends Activity {
   	
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
       }
       
       public void onClick(View v){
       	System.out.println("将事件处理方法直接绑定到标签");
       }
       
   }