1.屏蔽返回键

    @Override
    public void onBackPressed() {
        // super.onBackPressed();
    }

2.屏蔽Home键
首先需要在onCreate()里面注册广播：

registerReceiver(mHomeKeyEventReceiver, new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));  

然后监听mHomeKeyEventReceiver这个广播：

private BroadcastReceiver mHomeKeyEventReceiver = new BroadcastReceiver() {  
        String SYSTEM_REASON = "reason";  
        String SYSTEM_HOME_KEY = "homekey";  
        String SYSTEM_HOME_KEY_LONG = "recentapps";  
  
        @Override  
        public void onReceive(Context context, Intent intent) {  
            String action = intent.getAction();  
            if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) { // 监听home键  
                String reason = intent.getStringExtra(SYSTEM_REASON);  
                  
                // 表示按了home键,程序到了后台  
                  
            }   
        }  
    };