android > 屏蔽掉返回键

Java代码 
public boolean onKeyDown(int keyCode, KeyEvent event) {    
       // TODO Auto-generated method stub     
       if(keyCode == KeyEvent.KEYCODE_BACK){  
        Toast.makeText(SetFunTime.this, "请点击界面上的返回按钮", Toast.LENGTH_LONG).show();  
           return true;    
       }    
       return super.onKeyDown(keyCode, event);    
   } 

public boolean onKeyDown(int keyCode, KeyEvent event) { 
        // TODO Auto-generated method stub  
        if(keyCode == KeyEvent.KEYCODE_BACK){
        Toast.makeText(SetFunTime.this, "请点击界面上的返回按钮", Toast.LENGTH_LONG).show();
            return true; 
        } 
        return super.onKeyDown(keyCode, event); 
    } 




然后使用 下面这个段  调用