Android按鈕單擊事件的五種實現方式

Android按鈕單擊事件的五種實現方式

1.匿名內部類作爲事件監聽器

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("匿名內部類作爲事件監聽器"); 
}
 });
 }
 }

2.內部類作爲事件監聽器

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("內部類作爲事件監聽器"); 
} 
} 
}

3.Activity本身作爲事件監聽器

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本身作爲事件監聽器"); 
}
 }

4.外部類作爲事件監聽器

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("外部類作爲事件監聽器"); 
} 
}

5.將事件處理方法直接綁定到標籤

<Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="點擊事件"
            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("將事件處理方法直接綁定到標籤");
    }
    
}