如何在Android App中屏蔽（攔截）Home按鍵及其他按鍵

編寫一個Acitivity，如下所示：
關鍵點1：屏蔽HOME按鍵，在onAttachedToWindow中設定FLAG_HOMEKEY_DISPATCHED
關鍵點2：屏蔽除Power , Home外的按鍵，覆蓋dispatchKeyEvent方法，並返回為true
public class LockByKeyGuard extends Activity {
       @Override
       public void onCreate(Bundle savedInstanceState) {
              super.onCreate(savedInstanceState);
              setContentView(R.layout.main);
       }
       @Override
       public void onAttachedToWindow() {
       //關鍵：在onAttachedToWindow中設定FLAG_HOMEKEY_DISPATCHED
              this.getWindow().addFlags(WindowManager.LayoutParams. FLAG_HOMEKEY_DISPATCHED);
              super.onAttachedToWindow();
       }
 
       @Override
       public boolean dispatchKeyEvent(KeyEvent event) {
              // 返回true，不響應其他key
              return true;
       }